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Taxonomic remarks on Havelockia and Thyone (Echinodermata: Holothuroidea: Dendrochirotida), with descriptions of two new species from the Brazilian coast

Published online by Cambridge University Press:  18 December 2018

Luciana Martins Open the ORCID record for Luciana Martins [Opens in a new window]  and
Camilla Souto Open the ORCID record for Camilla Souto [Opens in a new window]
Luciana Martins*
Affiliation:
Museu de Zoologia, Universidade de São Paulo, São Paulo–SP, 04263-000, Brazil
Camilla Souto
Affiliation:
University of California Museum of Paleontology and Department of Integrative Biology, 1101 Valley Life Science Building, University of California, Berkeley, CA, 94720, USA
*
Author for correspondence: Luciana Martins, E-mail: martinsrluciana@gmail.com
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Abstract

Thyone and Havelockia are worldwide-distributed genera represented in the Western Atlantic by eight and three species, respectively. In this paper, we describe two new shallow-water species from the Brazilian coast: Thyone waltinhoi sp. nov. and Havelockia oraneae sp. nov. These genera are very similar morphologically but the presence of subdivisions in their calcareous rings separates them into different families, Thyone in Phyllophoridae and Havelockia in Sclerodactylidae. To observe the presence of subdivisions, we submerged the calcareous rings in an iodine solution prior to morphological analyses. Thyone waltinhoi sp. nov. differs from its Western Atlantic congeners in its dermal ossicles and Havelockia oraneae sp. nov. differs from its South-western Atlantic congeners in the composition of its introvert ossicles. In addition to species descriptions, illustrations and morphological diagnoses of both genera are provided, along with a synoptic table of their Western Atlantic species, and a discussion of the taxonomic significance of the dermal ossicles and the calcareous ring.

Keywords

EchinodermataPhyllophoridaeSclerodactylidaesea cucumberSouth-western Atlantictaxonomy
Type
Review
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 99 , Issue 5 , August 2019 , pp. 1127 - 1134
Copyright
Copyright © Marine Biological Association of the United Kingdom 2018 

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