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
复制标题
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
复制
发表时间:
2019
期刊:
影响因子:
1
通讯作者:
Müller
中科院分区:
文献类型:
--
作者:
Theska;Wilkinson;D. J. ;Müller
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.
登录
查看更多内容
影响因子:
0.9
作者:
S. Maddock;M. Wilkinson;D. Gower
通讯作者:
D. Gower
影响因子:
2.9
作者:
B. D. Todd
通讯作者:
B. D. Todd
影响因子:
1.5
作者:
M. Wake
通讯作者:
M. Wake
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
DOI:
--
发表时间:
1936
期刊:
影响因子:
--
作者:
H. W. Parker
通讯作者:
H. W. Parker