Biology

Tail growth in Chamaeleo dilepis (Sauria: Chamaeleonidae): Functional implications of segmental patterns

Document Type

Article

Abstract

Patterns of growth of caudal vertebrae in the chameleon Chamaeleo dilepis were determined using principal component analysis, and compared to growth of the entire tail relative to snout-vent length. Despite significant positive allometry of the whole tail, growth rates of vertebrae differed along the length of the tail. Specifically, there was a proximal region that grew positively allometrically, and an extensive distal portion that grew with negative allometry. Intervening, was a short transitional region of approximate isometry. Positive allometry of the entire tail resulted from the extensive proximal region that grew in this manner. Although the region of positive allometry extended further caudad than the m. caudofemoralis longus, m. retractor penis magnus, and m. ischiocaudalis, its extent correlated more closely with the presence of neural spines (which are used as a proxy for the extent of the m. transversospinalis) and with tail coiling in this species. The positively allometric region housed the non-segmental musculature of the tail and did not bend, and the negatively allometric region identified the portion of the tail that was prehensile.

Publication Title

Journal of Zoology

Publication Date

12-1-2003

Volume

261

Issue

4

First Page

417

Last Page

425

ISSN

0952-8369

DOI

10.1017/S095283690300428X

Keywords

Chamaeleo dilepis, Chamaeleonidae, growth, morphometrics, tail, vertebrae

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