Redescription and anatomical investigation of Schroederichthys maculatus Springer, 1966 and S. saurisqualus Soto, 2001 with comments on their systematics (Chondrichthyes: Carcharhiniformes: Atelomycteridae)

Author(s)

Soares, Karla D. A. ; Zanini, Flavia

• Document type: Journal article
• Source: ZOOLOGISCHER ANZEIGER; v. 302, p. 15-pg., 2023-01-03.

Abstract

Schroederichthys maculatus and S. saurisqualus together with S. tenuis present an elongated postpelvic trunk region and are usually referred as the neotenic species group of the genus Schroederichthys. The original morphological description of the two former species was mainly focused on external morphology and detailed information on anatomical structures such as neurocranium and teeth are lacking. This study aims, therefore, to present further information on external morphology, teeth and dermal denticles and to reappraise and illustrate skeletal structures of Schroederichthys maculatus and S. saurisqualus. Ethanol-preserved specimens of both species were measured and dissected for the examination of internal anatomical structures, such as neurocranium, teeth, dermal denticles and visceral arches. Three new tooth measurements are proposed herein. Neurocranial mea-surements, disposition of orbital foramina and tooth characters vary among neotenic species of Schroederichthys and should be included in future cladistic analyses. A detailed anatomical investigation of S. bivius and S. chilensis is also recommended in order to shed light on the interrelationships within the genus. (AU)

• FAPESP's process: 16/22214-0 - Taxonomy and morphology of Northeastern Atlantic Scyliorhinus Blainville, 1816 (Chondrichthyes; Carcharhiniformes; Scyliorhinidae)
• Grantee: Karla Diamantina de Araújo Soares
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate
• FAPESP's process: 15/21314-9 - Taxonomy and morphology of Western central Atlantic Scyliorhinus Blainville, 1816 (Chondrichthyes; Carcharhiniformes; Scyliorhinidae)
• Grantee: Karla Diamantina de Araújo Soares
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate
• FAPESP's process: 14/20316-5 - Taxonomy and morphology of genus Scyliorhinus Blainville, 1816 (Chondrichthyes: Carcharhiniformes: Scyliorhinidae)
• Grantee: Karla Diamantina de Araújo Soares
• Support Opportunities: Scholarships in Brazil - Doctorate