Two Cases of Melanism in the Ring-Headed Dwarf Snake Eirenis Modestus (Martin, 1838) from Kastellorizo, Greece (Serpentes: Colubridae)
Herpetology Notes, volume 11: 175-178 (2018) (published online on 20 February 2018) Two cases of melanism in the Ring-headed Dwarf Snake Eirenis modestus (Martin, 1838) from Kastellorizo, Greece (Serpentes: Colubridae) Konstantinos Kalaentzis1,*, Christos Kazilas1 and Ilias Strachinis1 Pigmentation serves a protective role in many 2016). A possible adaptive hypothesis for melanism in animals, including snakes, whether it functions in snakes is protection against sun damage (Lorioux et al., camouflage, warning, mimicry, or thermoregulation 2008; Jablonski and Kautman, 2017). (Bechtel, 1978; Krecsák, 2008). The observable The Ring-headed Dwarf Snake, Eirenis modestus colouration and pattern of a snake is the result of the (Martin, 1838), is a medium-sized colubrid snake presence of variously coloured pigments in specific reaching a maximum total length of 70 cm (Çiçek and places in the skin (Bechtel, 1978). Four different types Mermer, 2007). The Dwarf Snake inhabits rocky areas of pigment-bearing cells called chromatophores can with sparse vegetation and often hides under stones, be found in the skin of reptiles, namely melanophores, where it feeds mainly on terrestrial arthropods (Çiçek iridophores, erythrophores, and xanthophores (Bechtel, and Mermer, 2007). It is widely distributed (Fig. 1), 1978). Abnormalities in the pigment formation or the occurring mainly in the Caucasus (Armenia, southern interaction between the different types of pigment may Azerbaijan, eastern Georgia, southern Russia), Greece result in various chromatic disorders, which cause (on the islands of Alatonissi, Chios, Fournoi, Kalymnos, abnormal colouration of the skin and its derivatives Kastellorizo, Leros, Lesvos, Samiopoula, Samos, (Rook et al., 1998). There are many literature reports and Symi), northwestern Iran, and Turkey (Çiçek and describing chromatic anomalies in snakes, of which Mermer, 2007; Mahlow et al., 2013).
[Show full text]