Cabrera-Téllez Laura, Tarazona Oscar A, Ramírez-Pinilla Martha Patricia
Laboratorio de Biología Reproductiva de Vertebrados, Escuela de Biología, Universidad Industrial de Santander, Bucaramanga, Colombia.
J Morphol. 2010 Nov;271(11):1374-85. doi: 10.1002/jmor.10880.
Webbed foot morphology is a highly homoplastic character in species of Bolitoglossa and has been assumed to be pedomorphic. This study examines the morphology and posthatching ontogeny of the autopodial skeleton of Bolitoglossa nicefori and compares the descriptive and morphometric results with other species of the genus. We show that the autopodial morphology of B. nicefori coincides with the generalized pattern of the genus; webbed foot morphology is produced by pedomorphosis that affect the phalange length of the digits, resulting in a synchronized growth of digits (length and ossification rates) and the fleshy web. Although the webbed foot morphology of B. nicefori might be explained by the pervasive pedomorphic developmental trend observed in the genus, the large degree of variation encountered in the morphology of the distal phalanges indicates that the pedomorphic processes acting in this species are neither a simple truncation of the autopodial developmental program during early posthatching development nor a global process acting over the whole body plan. Instead, this morphological pattern is probably a result of the modular nature of limb development.
蹼足形态在疣螈属物种中是一种高度趋同的特征，并且被认为是幼态延续的。本研究考察了尼氏疣螈（Bolitoglossa nicefori） autopodial骨骼的形态及孵化后的个体发育情况，并将描述性和形态测量结果与该属的其他物种进行了比较。我们发现，尼氏疣螈的autopodial形态与该属的一般模式相符；蹼足形态是由影响指骨长度的幼态延续产生的，导致指（长度和骨化速率）和肉质蹼的同步生长。尽管尼氏疣螈的蹼足形态可能可以用该属中普遍存在的幼态延续发育趋势来解释，但远端指骨形态中遇到的很大程度的变异表明，在这个物种中起作用的幼态延续过程既不是孵化后早期发育过程中autopodial发育程序的简单截断，也不是作用于整个身体蓝图的全局过程。相反，这种形态模式可能是肢体发育模块化性质的结果。
