Abstract
Intraspecific variation of the gross morphology of the retractor muscle was studied in 60 specimens of Parathyone braziliensis and 17 specimens of Thyonidium seguroensis. Specimens were dissected to expose the retractor muscle or were analyzed by micro-computed tomography. Early expectations that the point of origin of the retractor muscle at the longitudinal muscle relative to the midpoint of the body length was age-related and that the split of the retractor muscle into separate muscle bands could be used as taxonomic characters to separate species were not supported by anatomical evidence.
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Acknowledgements
We are grateful to Alberto Carvalho Laboratório Multiusuário de Processamento de Imagens de Microtomografia Computadorizada de Alta Resolução (MZUSP) for generation of μCT images. We are grateful to Wagner Magalhães (UFBA) for granting access to the museum collections under their responsibility and for logistical support.
Funding
This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – Brasil (CAPES) – Finance Code 001 (PNPD 88887.368621/2019‑00 to LM) and grant #2021/06442-1, São Paulo Research Foundation (FAPESP) to LM. MT thanks CNPq (309488/2020‑6) for supporting studies on the systematics of marine invertebrates.
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LM conceived the idea. Material preparation, data collection and analysis were performed by LM. The first draft of the manuscript was written by LM. All authors writing – review & editing and participated in the discussion of the results.
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Martins, L., Tavares, M. Additions to the Morphology of the Cucumariidae. I. Intraspecific Variation of the Retractor Muscle in Parathyone braziliensis (Verrill, 1868) and Thyonidium seguroensis (Deichmann, 1930) (Holothuroidea: Dendrochirotida). Thalassas 39, 405–412 (2023). https://doi.org/10.1007/s41208-022-00515-4
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DOI: https://doi.org/10.1007/s41208-022-00515-4