Advanced search
Start date
Betweenand
Related content
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Morphology of the clasper musculature in rays (Chondrichthyes; Elasmobranchii: Batoidea), with comments on their phylogenetic interrelationships

Full text
Author(s):
Moreira, Renan A. [1] ; de Carvalho, Marcelo R. [1]
Total Authors: 2
Affiliation:
[1] Univ Sao Paulo, Inst Biociencias, Dept Zool, Rua Matao, Trav 14, 101, BR-05508090 Sao Paulo, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Journal of Morphology; v. 279, n. 12, p. 1827-1839, DEC 2018.
Web of Science Citations: 0
Abstract

The subclass Batoidea comprise skates, electric rays, stingrays, guitarfishes, and sawfishes, and their interrelationships are still problematical despite recent morphological and molecular phylogenetic studies. The most recent morphological phylogeny indicates that guitarfishes are a polyphyletic group, and that the phylogenetic placement of Platyrhina and Platyrhinoidis is still unclear. Several molecular studies suggest that guitarfishes (except Zanobatus) and sawfishes comprise the monophyletic order Rhinopristiformes, and that thornback rays (Platyrhinidae, Platyrhina, and Platyrhinoidis) are more closely related to the electric rays (Torpediniformes); rhinopristiforms have recently been supported by morphological data as well. The clasper musculature of batoids suggests an alternative pattern of interrelationships for thornback rays, with the m. dilatator attached to the dorsal terminal 1 cartilage by a series of tendons found only in Rhinopristiformes and Platyrhinidae, suggesting that they are closely related. Furthermore, Rajiformes, Rhinopristiformes, and Platyrhinidae exclusively share a reduced m. extensor lateralis, suggesting that these taxa form a monophyletic group. This study identifies new synapomorphies that corroborate the separate monophyly of Rajiformes, Torpediniformes, and Myliobatiformes: the m. dilatator divided into dorsal and ventral bundles and the presence of a single m. flexor are found only in Rajiformes; the extensor lateralis with a laminar shape is a derived character of Torpediniformes; and the exclusive m. flexor medialis arising on the puboischiadic bar is derived for Myliobatiformes. (AU)

FAPESP's process: 13/12434-5 - Comparative morphology and importance systematic of the mixopterigium of Batoidea (Chondrichthyes: Elasmobranchii)
Grantee:Renan Andrade Moreira
Support Opportunities: Scholarships in Brazil - Doctorate