Crea il tuo Account

Home Page
  Mi Piace WebCommunityLab  Segui WebCommunityLab  Cerca nel Sito Notizie Scuola Materiali Didattici News Community Forums Tuo Account
    



 
 Ti trovi in:Home Page > Ambiente Giochi-Svago  >  Rettili

Riconoscimenti profScaglione.it

©

Info Utenti

Login

Nickname:
Password:
Login:

 

Social Registration Registrati
Passa da qui se hai già un account su Facebook

Termini di Servizio

Clicca su Accetto Termini Servizio per la loro accettazione e per dichiarare di avere almeno 13 anni: ti compariranno i loghi Social con cui potrai registrarti istantaneamente!


 

Ciao Utente Anonimo



Registrati direttamente qua su profScaglione.it

   Registrati


Hai perso la tua Password?




 

Guarda Lista Membri WebCommunityLab
Utenti

Membri del Sito:
Ultimi Membri Registrati alla WebCommunityLab Ultimo registrato:
     peppelarosa 
Numero totale Membri WebCommunityLab Complessivi: 1687

Persone Online:
Numero degli Ospiti Online in questo momento Ospiti: 58

Traffico:



Navigazione Sito

 Ambienti 
 HOME PAGE
 Ambienti
 Info-Statistiche
 Notizie-Scuola
 Didattica-Alimentazione
 Social-Community
 Giochi-Svago
 Aiuto-Risorse
 Info 
 Info-Statistiche
 Dedica Sito
 Chi siamo?
 Riconoscimenti
 Staff
 Contattaci
 Mappa Sito I
 Mappa Sito II
 Raccomanda il Sito
 Progetto_El_Awards2
 Presentazione WebCommunityLab
 Progetti
 Fai Proposte sui Progetti
 Partecipa alla WebCommunity
 Privacy
 TerminiServizio
 Bibliografia-Crediti
 Rss Notizie Scuola
 Rss Community
 Rss Enciclopedie Vocaboli
 Rss Ricette Community
 Rss Alimenti Community
 Rss Video YouTube
 Sistema Ricerca Globale
 Statistiche 
 Info-Statistiche
 Ricette più Viste
 Ricette più Votate
 Alimenti più Visti
 Alimenti più Votati
 Statistiche Forum
 Top Ten
 Sistema Ricerca Globale
 News Scuola 
 Notizie-Scuola
 News Scuola
 Argomenti Notizie Scuola
 News Ctg Prof
 News Ctg Stud-Prof
 News Ctg Studenti
 News Ctg Genitori-Stud
 News Ctg Presidi
 News Ctg Scuole
 News Ctg ATA
 News Ctg IPSSAR Nembro
 News Ctg Tutti
 Archivio Notizie Scuola
 Tags Scuola
 Forum Esami di Stato
 Forum Nuovi IPSSAR
 Sistema Ricerca Globale
 Didattica 
 Didattica-Alimentazione
 News Alimentazione
 Argomenti Alimentazione
 News Ctg Classi 1^
 News Ctg Classi 2^
 News Ctg Classi 3^
 News Ctg Classi 4^
 News Ctg Classi 5^
 News Ctg Tutte le Classi
 News Novità Sito
 Archivio News Alimentazione
 Enciclopedie
 Prove Strutturate
 Interrogatore
 Forums
 Mappa Ipertestuale Alimentazione Classe 5^
 Tags Alimentazione
 Ricette
 Alimenti
 Cruciverba-Alimentazione
 Impiccato Cl. 1^
 Impiccato Cl. 2^
 Impiccato Cl. 3^
 Impiccato Cl. 4^
 Impiccato Cl. 5^
 Calcolo I.M.C.
 Fabbisogni Energia
 Equivalenze
 Acronimi
 Sistema Ricerca Globale
 Social-Community 
 Social-Community
 Fan-Facebook-Twitter
 Il Tuo Account
 Messenger
 The Wall - Muro
 Messaggi Privati
 Chat
 Poesie
 Racconti Narrativa
 Guestbook Sito
 Cartoline Virtuali
 Citazioni
 Barzellette
 Sistema Ricerca Globale
 Giochi 
 Giochi-Svago
 Tris
 Impiccato Cl. 1^
 Impiccato Cl. 2^
 Impiccato Cl. 3^
 Impiccato Cl. 4^
 Impiccato Cl. 5^
 Scacchi
 MasterMind
 Sudoku
 Coloku
 Cruciverba-Alimentazione
 Cerca Parole
 Sistema Ricerca Globale
 Svago e Relax 
 Giochi-Svago
 Barzellette
 Ricette
 Citazioni
 Cani
 Gatti
 Pesci
 Uccelli
 Rettili
 Automobili
 FIFA World Cup
 Sistema Ricerca Globale
 Aiuto 
 Aiuto-Risorse
 Come_Registrarsi
 Aiuto Online
 Contattaci
 Invio Files Materiali
 Sistema Ricerca Globale
 Cerca in Acronimi
 Cerca in Barzellette
 Cerca in Poesie Amore
 Cerca in Altre Poesie
 Cerca Utenti
 Cerca Notizie Scuola
 Cerca News Community
 Cerca nei Forums
 Cerca in Ricette
 Cerca in Alimenti
 Cerca in Enciclopedia Alimenti
 Cerca in Enc. TSPC-TSPS
 Cerca in Gallery Multimediale
 Risorse 
 Aiuto-Risorse
 Crea Password
 Codice Fiscale
 Whois
 Nuke Generator
 GUIstuff
 Nuke Tools
 PHP-Nuke Tools
 Flash Tools
 Style Tools
 Crea Bottoni
 Creazione Banner
 Testo Scorrevole
 Testo 3d
 Convertitore Date Unix
 Byteconverter
 Sistema Ricerca Globale
 Partecipa 
 Partecipa alla WebCommunity
 News Alimentazione
 Invio Files Materiali
 Invia Vocabolo Enciclopedia
 Invia Ricetta
 Invia Alimento
 Invia Tuo Muro
 Invia Tua Poesia
 Invia Barzelletta
 Invia Tuo Link
 Invia Img x Gallery
 Fai Proposte sui Progetti
 Segnala o Consiglia
 Sistema Ricerca Globale

Count Down

Alla Fine della Scuola mancano .....
6 anni, 144 giorni, 15 ore, 22 minuti, 23 secondi fa


Ricerca Globale





Social

Condividi WebCommunityLab su
Facebook e Twitter


la WebCommunityLab è su Facebook!

Diventa Fan della WebCommunityLab:


la WebCommunityLab è su Twitter!


Guarda il canale wcl su YouTube!

Vai alla pagina della WebCommunityLab su YouTube

 

Ultimi Video

WebCommunityLab Mobile

WebCommunityLab di profScaglione.it è anche Mobile: le ultime 10 `News del Sito` e le ultime 10 `News della WebCommunityLab`, direttamente da cellulari, palmari e smartphone, attraverso delle pagine `leggere` create appositamente per questo scopo! Da non usare con il normale pc!
Questo è il link da digitare sul tuo Cellulare:
www.profscaglione.it/mobile

Ricette Allievi Casuali

Video casuali You Tube

Citazioni ed Eventi Storici

"Amare qualcuno è imparare la canzone che ha nel cuore"

Anonimo

 


28 Ottobre - In questo giorno nel ...
1977 - Il Consiglio dei Ministri decide la proroga del blocco degli affitti fino al 31 gennaio e di rinviare di 4 mesi le procedure per l'esecuzione degli sfratti.
1965 - Papa Paolo VI emette un decreto di assoluzione nei confronti degli ebrei per la colpevolezza collettiva nella crocifissione di Gesù.
1922 - Si dimette il primo ministro Facta. Parte la marcia su Roma di Benito Mussolini.
1886 - L'emblema dell'unità franco-americana viene inaugurata a New York. Opera dello scultore francese Frederic Auguste Bartholdi che l'ha intitolata "La libertà illumina il mondo" viene collocata sull'isola di Bedloe.

 


Cerca Globale Sito
block-cerca_centrale_rid
Vai alla Sezione Ricerca Globale



Cerca News Scuola
News Scuola
Cerca nei Forums
Forums
Cerca News WebCommunityLab
News Alimenti
Cerca nelle Ricette
Ricette
Community
Cerca negli Alimenti
Alimenti
Community
Cerca nelle Ricette
Enciclopedia
Alimentazione
Cerca negli Alimenti
Enciclopedia
Cucina, Sala

Avviso ai Visitatori

Avviso importante per i visitatori

Tutti i servizi e le notizie offerti da profscaglione.it sono rigorosamente a carattere gratuito: nonostante la cura profusa dallo Staff sono possibili refusi ed errori di diversa natura; tali servizi vengono offerti così come sono e non si fornisce alcuna garanza sulla continuità degli stessi, che possono sempre essere sospesi od interrotti in qualsiasi momento.

Si tenga inoltre presente che la WebCommunityLab di profscaglione.it è un sito in parte frutto di attività didattica che, per la sua particolare natura, richiede a volte la pubblicazione di materiale non sempre corretto, sull'affidabilita` del quale non si fornisce alcuna garanzia.

Buona navigazione 
 
 

  
 

Navigazione Ambienti WebCommunityLab

Info-Statistiche
News Scuola
Didattica & Alimentazione
Social-Community
Giochi $ Svago
Help

 


Rettili








Snake scales

Reptiles Guide

Snake scales

From Wikipedia the free encyclopedia, by MultiMedia

Back | Home | Up | Next


Elaborately shaped scales on the head of a Vine snake, Ahaetulla nasuta.
Elaborately shaped scales on the head of a Vine snake, Ahaetulla nasuta.

Scales are important for snakes - they are deemed to be reptiles by the presence of scales, amongst other things. [1] Snakes are entirely covered with scales or scutes. These scales vary in shape and size. Scales in their myriad variety cover the skin, protect the body of the snake, allow moisture to be retained within and give simple or complex colouration patterns which help in camouflage and antipredator display. Modifications of the scales serve other functions such as 'eyelash' fringes, rattles, and protective covers for the eyes.

Contents

Morphology of scales

Keeled scales of Buff-striped keelback Amphiesma stolata, a Colubrid.
Keeled scales of Buff-striped keelback Amphiesma stolata, a Colubrid.

Snake scales are formed from the epidermis. Each scale has an outer surface and an inner surface. The skin from the inner surface hinges back and forms a free area which overlaps the base of the next scale which emerges below this scale. [2]

A snake is born with a fixed number of scales. These are not added to or lost as it matures. The scales however grow larger in size and may change shape with each moult.[3]

Snake skin and scales help retain moisture in the animal's body. [4] Snakes can also 'hear' by sensing vibrations with their lower jaw and belly scales.

Surface and shape

Snake scales are of different shapes and sizes. Snake scales may be granular, have a smooth surface or have a longitudinal ridge or keel on it. Often, snake scales have pits, tubercles and other fine structures which may be visible to the naked eye or under a microscope. Snake scales may be modified to form fringes, as in the case of the Eyelash Bush Viper, Atheris ceratophora, or rattles as in the case of the rattlesnakes of North America.[5]

Certain primitive snakes such as boas, pythons and certain advanced snakes such as vipers have small scales arranged irregularly on the head. Other more advanced snakes have special large symmetrical scales on the head called shields or plates. [2]

Modified tail scales form a rattle on a Western Diamondback Rattlesnake Crotalus atrox.
Modified tail scales form a rattle on a Western Diamondback Rattlesnake Crotalus atrox.

Snakes have smaller scales around the mouth and sides of the body which allow expansion so that a snake can consume prey of much larger width than itself. The ventral scales or belly scales are large and oblong. They protect the soft underside of the snake and also grip surfaces allowing the snake to move. The large scales (called 'shields') on the snake's head play a similar role.[3]

Snake scales are cool and dry and not slimy. [6] That is because scales are made of keratin, the same material that nails and fingernails are made of.[3] Scales, more specifically, consist of mostly hard β keratins which are basically transparent. The colours of the scale are due to pigments in the inner layers of the skin and not due to the scale material itself. Scales are hued for all colours in this manner except for blue and green. Blue is caused by the ultrastructure of the scales. By itself, such a scale surface diffracts light and gives a blue hue, while, in combination with yellow from the inner skin it gives a beautiful iridiscent green.

Some snakes have the ability to change the hue of their scales slowly. This is typically seen in cases where the snake becomes lighter or darker with change in season. In some cases, this change may take place between day and night.[3] Snake scales occur in variety of shapes. They may be :-

Cycloid scales on Leptotyphlops humilis.
Cycloid scales on Leptotyphlops humilis.
  • cycloid as in Family Typhlopidae. [7]
  • long and pointed with pointed tips, as in the case of the Green Vine Snake Ahaetulla nasuta. [8]
  • broad and leaf-like, as in the case of green pit vipers Trimeresurus spp. [8]
  • as broad as they are long, for example, as in Rat snake Ptyas mucosus. [8]
  • keeled weakly or strongly as in the case of the Buff-striped keelback Amphiesma stolatum. [8]
  • with bidentate tips as in some spp of Natrix. [8]
  • spinelike, juxtaposed as in the Short Seasnake Lapemis curtus. [2]
  • large, non-overlapping knobs as in the case of the Javan Mudsnake Xenodermis javanicus. [2]
  • modified tail scales to form a rattle as in the rattlesnakes of the genera Crotalus and Sistrurus.

Another example of differentiation of snake scales is a transparent scale called the brille or spectacle which covers the eye of the snake. The snake has no eyelids and the brille protects the eye. It is shed as part of the old skin during moulting.[9]

Moulting

Cascavel (Crotalus durrisus), a rattlesnake, seen moulting.
Cascavel (Crotalus durrisus), a rattlesnake, seen moulting.

The shedding of scales is called moulting or sloughing. In the case of snakes, the complete outer layer of skin is shed in one layer. [10] Snake scales are not discrete but extensions of the epidermis hence they are not shed separately, but are ejected as a complete contiguous outer layer of skin during each moult, akin to a sock being turned inside out.[3]

Moulting serves a number of functions - firstly, the old and worn skin is replaced, secondly, it helps get rid of parasites such as mites and ticks. Renewal of the skin by moulting is supposed to allow growth in some animals such as insects, however this view has been disputed in the case of snakes. [11] [3]

Moulting is repeated periodically throughout a snake's life. Before a moult, the snake stops eating and often hides or moves to a safe place. Just prior to shedding, the skin becomes dull and dry looking and the eyes become cloudy or blue-colored. The inner surface of the old outer skin liquefies. This causes the old outer skin to separate from the new inner skin. After a few days, the eyes clear and the snake "crawls" out of its old skin. The old skin breaks near the mouth and the snake wriggles out aided by rubbing against rough surfaces. In many cases the cast skin peels backward over the body from head to tail, in one piece like an old sock. A new, larger, and brighter layer of skin has formed underneath. [3] [12]

An older snake may shed its skin only once or twice a year, but a younger, still-growing snake, may shed up to four times a year.[12] The discarded skin gives a perfect imprint of the scale pattern and it is usually possible to identify the snake if this discard is reasonably complete and intact.[3]

Taxonomic importance

Nomenclature of scales (top view of head)
Nomenclature of scales (top view of head)

Scales do not play an important role in distinguishing between the families but are important at generic and specific level. There is an elaborate scheme of nomenclature of scales. Scales patterns, by way of scale surface or texture, pattern and colouration and the division of the anal plate, in combination with other morphological characteristics, are the principal means of classifying snakes down to species level. [13]

In certain areas in North America, where the diversity of snakes is not too large, easy keys based on simple identification of scales have been devised for the lay public to distinguish poisonous snakes from non-poisonous snakes.[14] [15] In other places with large biodiversity, such as Myanmar, publications caution that venomous and non-venomous snakes cannot be easily distinguished apart without careful examination.[16]

Identification of snakes by reference to scales seems an arcane art to the amateur naturalist because the nomenclature of snake scales seems esoteric and, more importantly, the snakes need to be caught and the head and body examined closely in hand for identification. The advent of high definition digital cameras means that images taken of snakes, if of appropriate definition and of the correct position, would show scales that can be examined, distinguished and counted without the need for catching and handling.

The scales patterning may also be used for individual identification in field studies. Clipping of specific scales to mark individual snakes is a popular approach to population estimation by mark and recapture techniques.

Nomenclature of scales

This part of the article provides a photographic guide cum glossary of scale names on a snake's head and body for easy and convenient identification by the reader, with annotated photographs of Buff-striped Keelback Amphiesma stolata (a common grass-snake of South Asia) for following the text.

Head scales

Nomenclature of scales (underside view of head)
Nomenclature of scales (underside view of head)

Identification of scales is most conveniently begun with reference to the nostril which is easily identified on the snake. There are two scales enclosing the nostril which are called the nasals. The outer nasal (near the snout) is called the prenasal. The inner nasal (near the eye) is called the postnasal. Along the top of the snout connecting the nasals on both sides of the head are scales called internasals.

Between the two prenasals is a scale at the tip of the snout. This is called the rostral scale.

The scales around the eye are called circumorbital scales and are named as ocular scales but with appropriate prefix. The ocular scale proper is a transparent scale covering the eye. The ocular scale is also called spectacle, brille or eyecap.

The circumorbital scales towards the snout or the front are called preocular scales, those towards the rear are called postocular scales and those towards the upper or dorsal side are called as supraocular scales. Circumorbital scales toawrds the venral or lower side, if any, are called as subocular scales.

Between the preocular and the postnasal scales are the loreal scales.

The scales along the lips of the snake are called as labials. Those on the upper lip are called supralabials while those on the lower labial are called infralabials.

Between the eyeballs on top of the head, adjacent to the supraoculars are the frontal scales. The prefrontal scales are the scales connected to the frontals towards the tip of the snout which are in contact with the internasals.

The back of the top of the head has scales connected to the frontal scales called as the parietal scales. At the sides of the back of the head are scales called temporal scales.

On the underside of the head, a snake has an anterior scale called as the mental scale. Connected to the mental scales and all along the lower jaws are the infralabials. Along the lower jaw connected to infralabials are a pair of shields called the anterior chin shields. Next to the anterior chin shields, further back along the jaw are another pair of shields called the posterior chin shields.

Scales on the body

Enlarged vertebral scales of Banded Krait Bungarus fasciatus
Enlarged vertebral scales of Banded Krait Bungarus fasciatus

The scales on the body of the snake are called the dorsal or costal scales. Sometimes there is a special row of large scales along the top of the back of the snake, i.e, the uppermost row, called the vertebral scales.

The enlarged scales on the belly of the snake are called ventral scales or gastrosteges.

In "advanced" (Caenophidian) snakes, the broad belly scales and rows of dorsal scales correspond to the vertebrae, allowing scientists to count the vertebrae without dissection.

Tail scales

Nomenclature of scales (underside view of body)
Nomenclature of scales (underside view of body)

At the end of the ventral scales of the snake is an anal plate which protects the opening to the cloaca (a shared opening for waste and reproductive material to pass) on the underside near the tail. This anal scale may be single or divided into a pair. The part of the body beyond the anal scale is considered to be the tail.[17]

Sometimes snakes have enlarged scales, either single or paired, under the tail; these are called subcaudals or urosteges. These subcaudals may be smooth or keeled as in Bitis arietans somalica. The end of the tail may simply taper into a tip (as in the case of most snakes), it may form a spine (as in Acanthophis), end in a bony spur (as in Lachesis), a rattle (as in Crotalus), or a rudder as seen in many sea snakes.

The rattlesnake tail is made up of a series of loosely linked, interlocking chambers that when shaken, vibrate against one another to create the warning signal of a rattlesnake. Only the bottom button is firmly attached to the tip of the tail.[17]

Sources. Details for this section have been sourced from scale diagrams in Malcolm Smith.[18] Details of scales of Buff-striped Keelback have been taken from Daniels. [19]

Arrangement of scales

Snake have imbricate scales, overlapping like the tiles on a roof. [20] Snakes have rows of scales along the whole or part of their length and also many other specialised scales, either singly or in pairs, occurring on the head and other regions of the body.

The dorsal scales on the snake's body are arranged in rows along the length of their bodies. Adjacent rows are diagonally offset from each other. Most snakes have an odd number of rows across the body though certain species have an even number of rows e.g. Zaocis spp. [2] In the case of some aquatic and marine snakes, the scales are granular and the rows cannot be counted . [20]

The number of rows range from ten in Tiger Ratsnake Spilotes pullatus; thirteen in Dryocalamus, Liopeltis, Calamaria and Asian coral snakes of genus Calliophis; 65 to 75 in Python; 74 to 93 in Kolpophis and 130 to 150 in Acrochordus. The majority of the largest family of snakes, the Colubridae have 15, 17 or 19 rows of scales. [2] [21]

The maximum number of rows are in mid-body and they reduce in count towards the head and on the tail.

Glossary of scales

Nomenclature of scales (side view of head)
Nomenclature of scales (side view of head)
A line diagram from G.A. Boulenger's Fauna of British India (1890)illustrating the terminology of shields on the head of a snake
A line diagram from G.A. Boulenger's Fauna of British India (1890)illustrating the terminology of shields on the head of a snake
  • Scales on the head.
    • Rostral.
      Nasorostral.
    • Nasal.
      • Prenasal.
        Postnasal.
        Supranasal.
        Fronto-nasal.
    • Internasal.
      Brille, spectacle, ocular scale,[3] eyecap.[22].
    • Circumorbital.
      • Preocular.
        Postocular.
        Supraocular.
        Subocular.
    • Loreal.
      Interorbital, Intersupraocular.
      Frontal.
      Prefrontal.
      Parietal.
      Occipital.
      Interoccipital.
      Temporal.
    • Labial.
      • Supralabial, Upper labial.
        Sublabial, Infralabial, Lower labial.
    • Mental.
    • Chin shield.
      • Anterior chin shield.
        Posterior chin shield.
        Intergeneial.
    • Gular.
  • Scales on the body.
    • Dorsal.
      Vertabral.
      Ventral, Gastrostege.
  • Scales on the tail.
    • Anal.
      Subcaudal, Urostege.

Use of scales in distinguishing between venomous and non-venous snakes

Finding out whether a snake is venomous or not is correctly done by identification of the species of a snake with the help of experts, or in their absence, close examination of the snake and using authoritative references on the snakes of your geographical region to identify it. Scale patterns help indicate the species and from the references, it can be verified if the snake species is venomous or not.

A point to note is that identification requires a fair degree of knowledge about snakes, their taxonmy, snake-scale nomenclature as well as familiarity and access to authoritative scientific texts on snakes. Handling of live snakes by persons other than trained handlers for identification or any other reason is not advised.

In South Asia, it is adviseable to kill the snake which has bitten a person and carry it along to the hospital for possible identification by medical staff so that informed decision can be taken them as to whether anti-venin is to be administered or not.

Banded Krait (Bungarus fasciatus), an Elapid, with no loreal scale between nasal and pre-ocular scales.
Banded Krait (Bungarus fasciatus), an Elapid, with no loreal scale between nasal and pre-ocular scales.

In certain regions, experts use presence or absence of certain scales to distinguish between non-venomous and venomous scales, with well-understood exceptions. For example, in relation to venomous snakes of Myanmar, the distribution of snakes permits the use of the presence or absence of loreal scales to distinguish between relatively harmless Colubrids and lethally venomous Elapids[16].

The rule of hand for this region is that the absence of a loreal scale between the nasal scale and pre-ocular scale indicates that the snake is an Elapid and hence lethal[16].

Please note that this rule-of-hand applies to terrestrial venomous snakes only and that vipers are an exception since they cannot be so classified due to the large number of small scales on the head. Subsequently a further check is to be carried out in the case of identified Colubrids to exclude known poisonous members of their family such as Rhabdopis species[16].

Cultural significance

The highly periodic cross-hatch or grid patterns on snakeskin appeal to people's aesthetics. Snakeskin is used to manufacture of many leather articles including fashionable accessories.[23] The use of snakeskin has endangered snake populations[24] and resulted in international restrictions in trade of certain snake species and populations in the form of CITES provisions.[25] Animal lovers in many countries propagate the use of artificial snakeskin instead, which are easily produced from embossed leather, patterned fabric, plastics and other materials.[23]

Snake scales have inspired dread and awe in humans from pre-historic times. Patterns in art prevalent to those times and later on may be ascribed to the visual influence of snakes, some of which, such as the Gaboon Viper, can both repel and fascinate the human mind. Studies of fear imagery and psychological arousal indicate that snake scales are a vital component of snake imagery. Snake scales also appear to have affected Islamic art in the form of tessallated mosaic patterns which show great similarity to snake-scale patterns.[23]

A snake scale was portrayed as a clue in the 1982 sci-fi cum film noir called 'Blade Runner'. [26]

Snake scales occur as a motif regularly in computer action games.[27] [28] [29] [30]

Snake scales also figure in popular fiction, such as the Harry Potter series (as a raw material for concocting potions), and also in teen fiction [31].

Cited references

  1. ^ Boulenger, George A. 1890 The Fauna of British India. page 1
  2. ^ a b c d e f Greene, Harry W. Snakes - The Evolution of Mystery in Nature, page 22
  3. ^ a b c d e f g h i Are snakes slimy? at Singapore Zoological Garden's Docent. Accessed 14 August 2006.
  4. ^ Kentucky Snake Publication (pdf). University of Kentucky
  5. ^ Greene, Harry W. Snakes - The Evolution of Mystery in Nature, page 23
  6. ^ Herpetology FAQ at San Diego Museum of Natural History. Accessed 14 August 2006.
  7. ^ Boulenger, George A. The Fauna of British India... page 234
  8. ^ a b c d e Smith, Malcolm A. Fauna of British India...Vol III - Serpentes, page 6
  9. ^ The Snakes of Indiana at The Centre for Reptile and Amphibian Conservation and Management, Indiana. Accessed 14 August 2006.
  10. ^ Smith, Malcolm A. Fauna of British India...Vol I - Loricata and Testudines, page 30
  11. ^ ZooPax Scales Part 3
  12. ^ a b General Snake Information - Division of Wildlife, South Dakota
  13. ^ How to identify snakes - Kentucky snake identification. University of Kentucky
  14. ^ North Carolina State Wildlife Damage Notes - Snakes
  15. ^ Pennsylvania State University - Wildlife Damage Control 15 (pdf)
  16. ^ a b c d Leviton AE, Wogan GOU, Koo MS, Zug GR, Lucas RS, Vindum JV. 2003. The Dangerously Venomous Snakes of Myanmar, Illustrated Checklist with Keys. Proc. Cal. Acad. Sci. 54 (24):407-462. PDF at Smithsonian National Museum of Natural History, Division of Amphibians and Reptiles. Accessed 8 August 2006.
  17. ^ a b Reptiles - Snake facts. Columbus Zoo & Aquarium.
  18. ^ Smith, Malcolm A. Fauna of British India. Vol III - Serpentes, page 29
  19. ^ Daniels, J.C. Book of Indian Reptiles and Amphibians. Pages 116-118
  20. ^ a b Smith, Malcolm A. Fauna of British India...Vol III - Serpentes, page 5
  21. ^ Smith, Malcolm A. Fauna of British India...Vol III - Serpentes, page 7
  22. ^ Evolution of snakes. Accessed 21 August 2006.
  23. ^ a b c Voland,Eckart and Grammer,Karl - Evolutionary Aesthetics, (2003) Springer, ISBN 3540436707. pages 108-116 ( Accessed through Google Book Search beta on 14 August 2006).
  24. ^ The Endangered Species Handbook - Trade (chapter) Reptile Trade - Snakes and Lizards (section) - accessed on 15 August 2006
  25. ^ Species in Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) - accessed on 14 August 2006
  26. ^ BRMovie.com Encyclopaedia ( Accessed on 16 August 2006).
  27. ^ Gabriel Knight - Sins of the Father ( Accessed on 16 August 2006).
  28. ^ Snake Rattle 'n Roll ( Accessed on 16 August 2006).
  29. ^ Allahkazam's Magical Realm ( Accessed on 16 August 2006).
  30. ^ Legend of Mana ( Accessed on 16 August 2006).
  31. ^ Jade Green and Jade White

Other references

  • Boulenger, George A., (1890), The Fauna of British India including Ceylon and Burma, Reptilia and Batrachia. Taylor and Francis, London.
  • Daniels, J.C. Book of Indian Reptiles and Amphibians. (2002). BNHS. Oxford University Press. Mumbai.
  • Greene, Harry W. (2004), Snakes - The Evolution of Mystery in Nature. University of California Press, pages 22-23 (excerpted from Google Book Search beta on 07 August 2006).
  • Leviton AE, Wogan GOU, Koo MS, Zug GR, Lucas RS, Vindum JV. 2003. The Dangerously Venomous Snakes of Myanmar, Illustrated Checklist with Keys. Proc. Cal. Acad. Sci. 54 (24):407-462. PDF at Smithsonian National Museum of Natural History, Division of Amphibians and Reptiles.
  • Mallow D, Ludwig D, Nilson G. 2003. True Vipers: Natural History and Toxinology of Old World Vipers. Krieger Publishing Company, Malabar, Florida. 359 pp. ISBN 0-89464-877-2.
  • Smith, Malcolm A. (1943), The Fauna of British India, Ceylon and Burma including the whole of the Indo-Chinese Sub-region, Reptilia and Amphibia. Vol I - Loricata and Testudines, Vol II-Sauria, Vol III-Serpentes. Taylor and Francis, London.

External links

See also


Home | Up | Boa genus | Colubrids | Elapids | Pythons | Vipers | Snake scales | Snakes in mythology

Reptiles Guide, made by MultiMedia | Free content and software

This guide is licensed under the GNU Free Documentation License. It uses material from the Wikipedia.








 

* Cerca Globale Sito *

block-cerca_centrale_rid





Con Sistema avanzato di Filtri per le singole Sezioni
e la possibilità (come su Google) di cercare due-tre termini ben precisi mettendoli tra le " " (virgolette: il sistema troverà tutti i documenti in cui le parole tra le virgolette compaiono tutte in quel preciso ordine).


Cerca nelle Notizie / News sulla Scuola

Cerca News Scuola
Notizie sulla Scuola


Cerca nei Forums

Cerca nei Forums
Forums Community


Cerca nelle News della WebCommunityLab

Cerca News WebCommunityLab
News della WebCommunityLab


Cerca in:
Enciclopedia Alimentazione


Cerca nella Enciclopedia Scienza degli Alimenti e Biologia
Enciclopedia Alimentazione


Cerca in:
Enciclopedia Cucina, Enologia
Salabar


Cerca nella Enciclopedia Tecnica dei Servizi, Pratica di Cucina, Enologia
Enciclopedia Tecnica dei Servizi,
Pratica di Cucina, Enologia


Cerca nella Sezione Ricette

Cerca nelle Ricette
Ricette Community


Cerca nella Sezione Alimenti

Cerca neigli Alimenti
Alimenti Community




Calcolo IMC - Fabbisogno Energetico


Calcolo dell' Indice di Massa Corporea (I.M.C.) o Body Mass Index (B.M.I.) e del Fabbisogno Energetico Giornaliero



Calcola l'Indice di Massa Corporea: I.M.C.


Calcola il Fabbisogno Energetico Giornaliero



 




Questo portale non è una testata giornalistica, è una pubblicazione aperiodica e non può quindi essere considerato
un prodotto editoriale ai sensi della Legge 7/3/01, n. 62.
Tutti i loghi e i marchi sono dei rispettivi proprietari. I commenti sono di chi li posta.
Tutti i materiali provenienti da http://it.wikipedia.org sono sotto licenza Creative Commons; tutto il resto: licenza Creative Commons Attribuzione-Non commerciale-Non opere derivate 3.0 Italia (CC BY-NC-ND 3.0 IT)
La responsabilità  degli scritti (articoli, messaggi, interventi sui forum, ...) è dei relativi autori: al riguardo profscaglione.it declina ogni responsabilità.



Webmaster and Administrator: prof. Flavio Scaglione.

Generazione pagina: 1.097 secondi (112)




Toolbar orizzontale Ambineti WebCommunityLab di profScaglione.it al fondo delle pagine