First Observation of Tail Bifurcation in the Clark's Lizard, Darevskia clarkorum (Darevsky & Vedmederja, 1977) and the Spiny-Tailed Lizard, Darevskia rudis (Bedriaga, 1886) (Squamata: Lacertidae).

Tail anomalies, such as bifurcation and trifurcation, are observed in different species of Lacertid lizards. In the present study, bilateral tail bifurcation was observed in male specimens belonging to Darevskia clarkorum and Darevskia rudis in the Eastern Black Sea Region of Turkey. In the specimen of D. clarkorum, SVL and TL are 55.37 mm and 66.43 mm, respectively. Bifurcation from the base of the tail occurred at 42.82 mm. The regenerated tail is 8.45 mm. SVL and TL are 83.56 mm and 128.93 mm, respectively in the specimen of D. rudis. Bifurcation from the base of the tail occurred at 33.38 mm. The length of the regenerated tail is 46.77 mm. [ABSTRACT FROM AUTHOR]