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Rupp, Guilherme Sabino; Costa, Robson C. Da; Marenzi, Adriano Weidner Cacciatori; Manzoni, Gilberto Caetano; Silva, Idalício S. Da

doi:10.33936/at.v3i3.4147

AquaTechnica

2021

DOI: 10.33936/at.v3i3.4147

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Guilherme Sabino Rupp¹,

Robson C. Da Costa

Adriano Weidner Cacciatori Marenzi

et al.

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Morphological characterization of anterior axial bifurcation in Holothuria (Halodeima) grisea and other puzzling occurrences in Holothuroidea

Rupp,

Martins,

Souto

et al. 2024

Invertebrate Biology

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The present study explores rare but taxonomically and geographically widespread cases of anterior body axial bifurcation in adult sea cucumbers (Echinodermata: Holothuroidea). One individual of Holothuria (Halodeima) grisea, a common intertidal species along the Atlantic coast of Brazil, was studied externally and internally. Individuals of Apostichopus californicus from the northeastern Pacific coast of Washington (USA), H. (Mertensiothuria) leucospilota in the Indian Ocean off La Réunion, H. (Panningothuria) forskali from the Atlantic coast of Spain, and Parastichopus tremulus from the northeastern Atlantic off Norway were also reported to display similar anterior body axial bifurcation. In each of these species, the anterior body presented two mouths with their respective crown of tentacles. In vivo observations of H. (Halodeima) grisea showed that the two tentacle crowns and mouths were independently functional. Micro‐computed tomography (μCT) revealed that the anterior region of the body (up to the pharynx) was duplicated. Internally, two aquapharyngeal bulbs were found, each with their own calcareous ring (one with two plates missing), madreporite, and Polian vesicles. The body presented a normal set of five longitudinal muscle bands, some of which bifurcated orally to support more than one calcareous ring plate. This is the first report of such abnormalities in Holothuroidea and hypotheses that may explain such phenomenon are discussed.

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Morphological characterization of anterior axial bifurcation in Holothuria (Halodeima) grisea and other puzzling occurrences in Holothuroidea

Rupp,

Martins,

Souto

et al. 2024

Invertebrate Biology

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show abstract

Sea Cucumbers (Echinodermata: Holothuroidea) from Santa Catarina Coast, Southern Brazil, with Notes on Their Abundance and Spatial Distribution

Rupp

Marenzi

Souza

et al. 2023

Journal of Shellfish Research

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Cited by 2 publications

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Morphological characterization of anterior axial bifurcation in Holothuria (Halodeima) grisea and other puzzling occurrences in Holothuroidea

Morphological characterization of anterior axial bifurcation in Holothuria (Halodeima) grisea and other puzzling occurrences in Holothuroidea

Sea Cucumbers (Echinodermata: Holothuroidea) from Santa Catarina Coast, Southern Brazil, with Notes on Their Abundance and Spatial Distribution

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