Cretaceous fossil gecko hand reveals a strikingly modern scansorial morphology: Qualitative and biometric analysis of an amber-preserved lizard hand
Cretaceous fossil gecko hand reveals a strikingly modern scansorial morphology: Qualitative and biometric analysis of an amber-preserved lizard hand
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DOI：
10.1016/j.cretres.2017.11.003
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发表时间：
2018-04-01
影响因子：
2.1
通讯作者：
Abdala, Virginia
中科院分区：
文献类型：
--
作者：
Fontanarrosa, Gabriela;Daza, Juan D.;Abdala, Virginia
壁虎(壁虎和壁虎)是一种被认为起源于早白垩世的沼泽动物，今天它展示了蜥蜴中最显着的扫描能力之一。关于扫描的起源的信息很少，这种扫描后来在这个地区的生态地貌方面变得广泛和多样化。缅甸北部白垩纪中期露头的一块未被描述的琥珀化石(MCZR-190835)，年代为99 Ma，以前被归类为Gekkota干，保存了腕骨、掌骨和指骨，以及辅助的攀缘结构，如粘附垫和指骨旁元素。这块化石证明了高度专业化的适应性结构的存在。在这里，我们详细地分析了推测的茎Gekkota的手部。我们在现存鳞片的背景下使用形态比较，产生详细的描述性分析和基于手部32个骨骼变量的线性判别分析(LDA)。比较样本包括现存的15个有鳞动物科的成员(AGamidae、Dactyloidae、Iguanidae、Leiosauridae、Liolaemidae、Polychrotidae、Tropididae、Diplodactylidae、Eublepharidae、Gekonidae、Phylloadactylidae、Sphaerodactylidae、Gymnopdymidae、Teiidae和Scinidae)。尽管马努斯化石在质量上与壁虎属成员更相似，但LDA分析将其置于壁虎属和Scincomoga共有的地形带。这一结果特别有趣，因为尽管只在壁虎科和叶甲科现存的壁虎中报告了旁指骨结构的存在，但使用粘性亚指甲系统攀爬的方法独立地起源于壁虎科、指甲科和指甲科。(C)2017爱思唯尔有限公司。保留所有权利。
Gekkota (geckos and pygopodids) is a Glade thought to have originated in the Early Cretaceous and that today exhibits one of the most remarkable scansorial capabilities among lizards. Little information is available regarding the origin of scansoriality, which subsequently became widespread and diverse in terms of ecomorphology in this (lade. An undescribed amber fossil (MCZ R-190835) from mid Cretaceous outcrops of the north of Myanmar dated at 99 Ma, previously assigned to stem Gekkota, preserves carpal, metacarpal and phalangeal bones, as well as supplementary climbing structures, such as adhesive pads and paraphalangeal elements. This fossil documents the presence of highly specialized adaptive structures. Here, we analyze in detail the manus of the putative stem Gekkota. We use morphological comparisons in the context of extant squamates, to produce a detailed descriptive analysis and a linear discriminant analysis (LDA) based on 32 skeletal variables of the manus. The comparative sample includes members of 15 extant squamate families (Agamidae, Dactyloidae, lguanidae, Leiosauridae, Liolaemidae, Polychrotidae, Tropiduridae, Diplodactylidae, Eublepharidae, Gekkonidae, Phyllodactylidae, Sphaerodactylidae, Gymnophthalmidae, Teiidae, and Scincidae). Although the fossil manus is qualitatively more similar to that of members of Gekkota, the LDA analysis places it in a morphozone shared by Gekkota and Scincomorpha. This result is particularly interesting, given that despite the presence of paraphalangeal structures had only been reported in extant geckos of the families Gekkonidae and Phyllodactylidae, the usage of an adhesive subdigital system to climb originated independently in Gekkota, Scincidae, and Dactyloidae. (C) 2017 Elsevier Ltd. All rights reserved.