2009年2月16日 星期一

古巨蜥為科摩多龍近親, 且巨蜥體型的的巨大化與島嶼無關

文獻來源: Head, JJ.; Barrett, PM.; Rayfield, EJ. 2009. Neurocranial osteology and systematic relationships of Varanus (Megalania) prisca Owen, 1859 (Squamata: Varanidae). Zoological Journal of the Linnean Society, 2009, 155, 445–457.[全文連結]

Abstract
The neurocranial osteology of the giant monitor lizard Varanus (Megalania) prisca Owen, 1859 is described in detail for the first time. Optimization of neurocranial characters onto phylogenetic topologies for varanoids, including Lanthanotus, Heloderma, and Varanus species nests V. prisca within an Indo-Australian clade of Varanus on the basis of characters of the otic capsule. A sister-taxon relationship between V. prisca and Varanus komodoensis Ouwens, 1912 is proposed based on apomorphies of the crista prootica, fenestra vestibuli, occipital recess, and supraoccipital. These results support a monophyletic clade of giant monitors among Indo-Australian species, and unambiguously synonymize Megalania with Varanus at both generic and subgeneric levels.

圖片連結: pbs.org