Musculoskeletal development of the Central African caecilian Idiocranium russeli (Amphibia: Gymnophiona: Indotyphlidae) and its bearing on the re-evolution of larvae in caecilian amphibians

Musculoskeletal development of the Central African caecilian Idiocranium russeli (Amphibia: Gymnophiona: Indotyphlidae) and its bearing on the re-evolution of larvae in caecilian amphibians
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中非蚓螈 Idiocranium russeli(两栖类:Gymnophiona:Indotyphlidae)的肌肉骨骼发育及其对蚓螈两栖类幼虫再进化的影响

DOI:
10.1007/s00435-018-0420-0
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发表时间:
2019
期刊:
影响因子:
1
通讯作者:
Müller
Müller
中科院分区:
生物学4区
文献类型:
--
作者:
Theska;Wilkinson;D. J. ;Müller

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关于无尾目两栖动物的发育形态学的详细记载很少,最近的研究强调了一些头骨元素同源性的问题。我们研究了胚胎和孵化后的骨骼和肌肉系统的发育ofIdiocraniumrusseli,可能是一个小型的盲肠特有的喀麦隆。Idiocranium已被建议是直接发展,我们的结果强烈支持这一假设。本文报道了不同胚胎期的外部形态、骨化顺序和颅肌的结构。russeli的研究表明,成体性状进入胚胎发育的异时性转变,以及各种幼虫和变态性状的丧失或缺失。例如,在变态过程中近形发育的触角,在晚期胚胎中已经完全发育。上颌骨和腭骨在孵化前融合形成上腭骨(在大多数双相物种的变态过程中)。幼虫独有的肌肉,如肌。舌骨间肌和肌舌骨下颌肌在发育过程中是不存在的,而成人肌肉包括m。颏舌肌和颏舌肌cephalodorsosubpharyngeus,在胚胎发育过程中形成。一个幼虫ceratobranchial四是目前和融合的ceratobranchial三非常早在个体发育。在发育过程中几乎完全没有幼虫特征,I。russeli类似于印度indotyphlid Gegeneophis ramaswamii;这种相似性使塞舌尔indotyphlid caecilians中自由生活的幼虫重新进化的简单解释复杂化。
Few detailed accounts of the developmental morphology of caecilian amphibians exist and recent studies have highlighted problems concerning the homology of some skull elements. We investigated the embryonic and post-hatching development of the skeleton and musculature ofIdiocranium russeli, a possibly miniaturized caecilian endemic to Cameroon.Idiocraniumhas been suggested to be direct developing; our results strongly support this hypothesis. The external morphology of different embryonic stages, the ossification sequence, and the configuration of the cranial muscles ofI. russeliindicate heterochronic shifts of adult traits into embryonic development, as well as the loss or absence of various larval and metamorphic traits. For example, the tentacle, which plesiomorphically develops during metamorphosis, is already fully developed in late embryos. The maxilla and the palatine, which fuse to form the maxillopalatine (during metamorphosis in most biphasic species), fuse well before hatching. Muscles exclusive to the larva, such as the m. interhyoideus and m. hyomandibularis, are absent during development, whereas adult muscles including the m. genioglossus and m. cephalodorsosubpharyngeus, form during embryonic development. A larval ceratobranchial IV is present and fuses to the ceratobranchial III very early in ontogeny. In its near complete absence of larval traits during development,I. russeliresembles the Indian indotyphlidGegeneophis ramaswamii; this similarity complicates a straightforward explanation for the re-evolution of free-living larvae in Seychelles indotyphlid caecilians.
小型长吻 Hypogeophis Peters 的新种,1880 年(两栖类:Gymnophiona:Indotyphlidae),产自塞舌尔马埃岛最高海拔地区。
DOI: --
发表时间: 2018
期刊: Zootaxa
影响因子: 0.9
作者:
S. Maddock;M. Wilkinson;D. Gower
通讯作者: D. Gower
DOI: --
发表时间: 2007
影响因子: 2.9
作者:
B. D. Todd
通讯作者: B. D. Todd
Idiocranium russeli(两栖类:Gymnophiona)的形态,以及通过异时性实现小型化的评论
DOI: --
发表时间: 1986
影响因子: 1.5
作者:
M. Wake
通讯作者: M. Wake
现代两栖动物的关系:重新审视
DOI: --
发表时间: 1963
期刊: The Quarterly review of biology
影响因子: --
作者:
T. S. Parsons;E. Williams
通讯作者: E. Williams
喀麦隆曼菲分部的两栖动物。-I。动物地理学和系统学。
DOI: --
发表时间: 1936
期刊:
影响因子: --
作者:
H. W. Parker
通讯作者: H. W. Parker