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| image = Crotalus willardi silus 433445.jpg | image = Crotalus willardi silus 433445.jpg
| genus = Crotalus | genus = Crotalus
| species_link = Crotalus willardi
| species = willardi | species = willardi
| subspecies = silus | subspecies = silus
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}} }}


'''''Crotalus willardi silus''','' the '''Western Chihuahuan Ridge-nosed Rattlesnake''', is a ] of ] native to ] and the ]. As with all ], it is ].<ref name=":1">{{Cite web |title=Crotalus willardi |url=https://reptile-database.reptarium.cz/species?genus=Crotalus&species=willardi |access-date=2025-01-08 |website=The Reptile Database}}</ref> '''''Crotalus willardi silus''','' the '''Western Chihuahuan ridge-nosed rattlesnake''', is a ] of ] native to ] and the ]. As with all ]s, it is ]ous.<ref name=":1">{{Cite web |title=Crotalus willardi |url=https://reptile-database.reptarium.cz/species?genus=Crotalus&species=willardi |access-date=2025-01-08 |website=The Reptile Database}}</ref>


== Description == == Description ==
''C. w. silus'' is recognisable as it has less conspicuous markings than its sister subspecies. Its ] is brown with irregular dark spots, it has a dark ] band starting dark brown at the corner of the eyes and fades to grey as it reaches the end of the ] and the front of the head is usually grey. It lacks the facial markings seen in other subspecies of ''C. willardi''. ''Crotalus willardi silus'' is recognisable as it has less conspicuous markings than its sister subspecies. Its ] is brown with irregular dark spots, it has a dark ] band starting dark brown at the corner of the eyes and fades to grey as it reaches the end of the ] and the front of the head is usually grey. It lacks the facial markings seen in other subspecies of ''C. willardi''.


], the ] is brown or red with blotched and dotted with brown markings.<ref>{{Cite journal |last=Van Devender |first=Thomas R. |last2=Lowe |first2=Charles H. |date=1977 |title=Amphibians and Reptiles of Yepómera, Chihuahua, Mexico |url=https://www.jstor.org/stable/1563290?seq=8 |journal=Journal of Herpetology |volume=11 |issue=1 |pages=41–50 |doi=10.2307/1563290 |issn=0022-1511}}</ref> Its rattle is dark brown and rounded, with sharp ] as a sheath for it, as is characteristic of the species.<ref name=":0">{{Cite book |last=San Diego Society of Natural History. |url=https://www.biodiversitylibrary.org/item/28518#page/141/mode/1up |title=Transactions of the San Diego Society of Natural History |last2=History |first2=San Diego Society of Natural |date=1946 |publisher=The Society |volume=v.11 (1946-1953) |location=}}</ref> ], the ] is brown or red with blotched and dotted with brown markings.<ref>{{Cite journal |last=Van Devender |first=Thomas R. |last2=Lowe |first2=Charles H. |date=1977 |title=Amphibians and Reptiles of Yepómera, Chihuahua, Mexico |url=https://www.jstor.org/stable/1563290?seq=8 |journal=Journal of Herpetology |volume=11 |issue=1 |pages=41–50 |doi=10.2307/1563290 |issn=0022-1511}}</ref> Its rattle is dark brown and rounded, with sharp ] as a sheath for it, as is characteristic of the species.<ref name=":0">{{Cite book |last=San Diego Society of Natural History. |url=https://www.biodiversitylibrary.org/item/28518#page/141/mode/1up |title=Transactions of the San Diego Society of Natural History |last2=History |first2=San Diego Society of Natural |date=1946 |publisher=The Society |volume=v.11 (1946-1953) |location=}}</ref>
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== Diet == == Diet ==
''C. w. silus'' has been recorded to eat ].<ref>{{Cite book |last=Brigham Young University. |url=https://www.biodiversitylibrary.org/page/8885537#page/696/mode/1up |title=The Great Basin naturalist |last2=University |first2=Brigham Young |last3=University |first3=Brigham Young |last4=Museum |first4=M. L. Bean |date=1985 |publisher=M.L. Bean Life Science Museum, Brigham Young University |volume=v.45 (1985) |location=Provo, Utah}}</ref> ''Crotalus willardi silus'' has been recorded to eat ]s.<ref>{{Cite book |last=Brigham Young University. |url=https://www.biodiversitylibrary.org/page/8885537#page/696/mode/1up |title=The Great Basin naturalist |last2=University |first2=Brigham Young |last3=University |first3=Brigham Young |last4=Museum |first4=M. L. Bean |date=1985 |publisher=M.L. Bean Life Science Museum, Brigham Young University |volume=v.45 (1985) |location=Provo, Utah}}</ref>


== Reproduction == == Reproduction ==
''C. w. silus'' is known to be ].<ref name=":1" /> ''Crotalus willardi silus'' is known to be ].<ref name=":1" />


== References == == References ==
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Latest revision as of 12:54, 10 January 2025

Subspecies of ridge-nosed rattlesnake from the Americas

Crotalus willardi silus
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Squamata
Suborder: Serpentes
Family: Viperidae
Genus: Crotalus
Species: C. willardi
Subspecies: C. w. silus
Trinomial name
Crotalus willardi silus
Klauber, 1949

Crotalus willardi silus, the Western Chihuahuan ridge-nosed rattlesnake, is a subspecies of ridge-nosed rattlesnake native to Mexico and the USA. As with all rattlesnakes, it is venomous.

Description

Crotalus willardi silus is recognisable as it has less conspicuous markings than its sister subspecies. Its head is brown with irregular dark spots, it has a dark ocular band starting dark brown at the corner of the eyes and fades to grey as it reaches the end of the supralabials and the front of the head is usually grey. It lacks the facial markings seen in other subspecies of C. willardi.

Dorsally, the snake is brown or red with blotched and dotted with brown markings. Its rattle is dark brown and rounded, with sharp scales as a sheath for it, as is characteristic of the species.

It is also a smaller snake, measuring up to 63.6 cm (25 in).

Diet

Crotalus willardi silus has been recorded to eat rodents.

Reproduction

Crotalus willardi silus is known to be ovoviviparous.

References

  1. ^ "Crotalus willardi". The Reptile Database. Retrieved 2025-01-08.
  2. Van Devender, Thomas R.; Lowe, Charles H. (1977). "Amphibians and Reptiles of Yepómera, Chihuahua, Mexico". Journal of Herpetology. 11 (1): 41–50. doi:10.2307/1563290. ISSN 0022-1511.
  3. ^ San Diego Society of Natural History.; History, San Diego Society of Natural (1946). Transactions of the San Diego Society of Natural History. Vol. v.11 (1946-1953). : The Society.
  4. Brigham Young University.; University, Brigham Young; University, Brigham Young; Museum, M. L. Bean (1985). The Great Basin naturalist. Vol. v.45 (1985). Provo, Utah: M.L. Bean Life Science Museum, Brigham Young University.
Taxon identifiers
Crotalus willardi silus


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