Harman Patil (Editor)

Ristella

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Kingdom
  
Animalia

Class
  
Reptilia

Infraorder
  
Scincomorpha

Phylum
  
Chordata

Order
  
Scaled reptiles

Subphylum
  
Vertebrata

Suborder
  
Sauria

Family
  
Scincidae

Rank
  
Genus

Ristella httpsuploadwikimediaorgwikipediacommonsthu

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Ristella is a genus of skinks endemic to southern India, which are commonly known as cat skinks because of their retractile claws.

Contents

Description

Palatine and pterygoid bones in contact on the median line of the palate, which is toothless;palatine notch small, far behind, corresponding to the posterior notch of the tongue. Teeth conical. Eyelids well developed, scaly. Ear-opening distinct. Nostril pierced in a single nasal; no supranasals; prefrontals small or coalesced; frontoparietals and interparietal distinct. Limbs well developed, anterior with 4, posterior with 5 digits; claws completely retractile into a large compressed sheath formed of one large scale cleft beneath.

Geographic range

Found in the hill-tracts of southern India.

Key to species

  • A. A pair of small prefrontals; frontonasal forming a suture with frontal.
  • a. Ear-opening much larger than nostril; dorsal scales feebly bi- or tricarinate.
  • R. rurkii
  • b. Ear-opening not, or but slightly, larger than nostril; dorsal scales sharply bicarinate.
  • R. travancorica
  • B. Two azygous shields between rostral and frontal.
  • a. 22 to 24 scales round middle of body; adpressed limbs not meeting.
  • R. guentheri
  • b 26 scales round body; adpressed limbs meeting or overlapping.
  • R. beddomii
  • Species

    The following four species are recognized:

  • Ristella beddomii Boulenger, 1887
  • Ristella guentheri Boulenger, 1887
  • Ristella rurkii Gray, 1839
  • Ristella travancorica (Beddome, 1870)
  • Nota bene: A binomial authority in parentheses indicates that the species was originally described in a genus other than Ristella.

    References

    Ristella Wikipedia


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