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New diagnostic characters for Amphiodia and Ophiophragmus (Amphiuridae, Ophiuroidea, Echinodermata)

Published online by Cambridge University Press:  24 July 2020

Gisella C.S. Chagas*
Affiliation:
University of Campinas, Institute of Biology, Zoology Museum, Campinas, São Paulo, Brazil
Renata A.S. Alitto
Affiliation:
University of Campinas, Institute of Biology, Zoology Museum, Campinas, São Paulo, Brazil
Helena Serrano
Affiliation:
University of Campinas, Institute of Biology, Zoology Museum, Campinas, São Paulo, Brazil
Gabriela Granadier
Affiliation:
University of Campinas, Institute of Biology, Zoology Museum, Campinas, São Paulo, Brazil
Pablo D.B. Guilherme
Affiliation:
University of the State of Paraná, Paranaguá, PR, Brazil
Michela Borges
Affiliation:
University of Campinas, Institute of Biology, Zoology Museum, Campinas, São Paulo, Brazil
*
Author for correspondence: Gisella C.S. Chagas, E-mail: gisella.biologia@gmail.com

Abstract

The genera Ophiophragmus and Amphiodia are amphiurids that are considered taxonomically difficult due to their great resemblance, few diagnostic characters and synonymy problems. Our aim is to redescribe the species using scanning electron microscopy and morphometry of diagnostic structures, and to provide new information for the identification of these Ophiuroidea. Five Amphiodia spp. and six Ophiophragmus spp. recorded in Brazil were rigorously redescribed. The descriptions include new diagnostic characters derived from external morphology, arm microstructures and morphometry. We also provided comparative analyses of species with shared characters such as Amphiodia riisei and Amphiodia trychna. The geographic and bathymetric distributions of the studied species were updated, and new records are provided. All the information presented may be used in taxonomic, ecological and phylogenetic studies, helping to fill gaps in the knowledge of the biodiversity, ecology and evolution of these Ophiuroidea. Conclusively, all the tools applied here assisted in the identification of genera and species and could be useful in other taxonomic studies of Echinodermata.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 2020

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