Systematics. Ecology and Biogeography of the Gekkonid Genus Cnemaspis in Borneo (Squamata Gekkonidae)

• Main Authors: Mohd Izneil, Nashriq, Das, Indraneil
• Format: Article
• Language: English; English
• Published: UNIMAS Publisher, Universiti Malaysia Sarawak 2019
• Subjects: QH301 Biology; QL Zoology
• Online Access: http://ir.unimas.my/id/eprint/31482/1/Cover%20page%20july2019.pdf; http://ir.unimas.my/id/eprint/31482/4/Indraneil%20Das.pdf; http://ir.unimas.my/id/eprint/31482/
• Institution: Universiti Malaysia Sarawak

Cnemaspis Strauch 1887 is a genus within the family Gekkonidae, comprising ~131 species, including 13 from Africa, 50 in south Asia, and 68 in south-east Asia, and is one of the most speciose Old World gekkonid genera. Morphological adaptation within the genus is conservative, species being relatively small, cryptically coloured, bearing broad, flattened head, large, forward and upwardly directed eyes, flattened body, long widely splayed limbs and long, inflected digits. Bornean Cnemaspis are represented by five nominal species- Cnemapis kendallii (Gray, 1845), Cnemaspis nigridia (Smith, 1925), Cnemaspis dringi Das & Bauer, 1998, Cnemaspis paripari Grismer & Chan, 2009 and Cnemaspis leucura Kurita et al., 2017. Their habitat ranges from lowland dipterocarp forests to primary and old-growth forest in submontane regions, often within karst, granite or sandstone landscapes. The study is designed to identify Bornean Cnemaspis species using a phylogenetic systematic approach, in combination with taxonomy and ecology, looking into their phenotypic differences, and to summarize their ecology and biogeography. It also touches on adaptive radiation, dispersal pattern, habitat fragmentation, and geographical barriers in determining their distribution. Past studies have shown that their distribution as restricted to north-west Borneo, attributed to the existence of ancient rivers of Sundaland. Initial geodispersal analyses reveal fragmented geo formations in north-western Sarawak to hold additional undescribed species, as confirmed by phylogenetic analyses based on mitochondrial NADH dehydrogenase subunit 2 gene (ND2), especially from isolated karst outcrops. Human impacts have led to a number extinction and extirpation of tropical faunas in the recent past. Ergo, the discovery of undescribed species and description of their respective habitat is essential not only to better appreciate the natural history of Borneo, but also to suggest methods for their conservation.