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Chiridota heheva—the cosmopolitan holothurian

Chiridota heheva—the cosmopolitan holothurian
Chiridota heheva—the cosmopolitan holothurian
Chemosynthetic ecosystems have long been acknowledged as key areas of enrichment for deep-sea life, supporting hundreds of endemic species. Echinoderms are among the most common taxa inhabiting the periphery of chemosynthetic environments, and of these, chiridotid holothurians are often the most frequently observed. Yet, published records of chiridotids in these habitats are often noted only as supplemental information to larger ecological studies and several remain taxonomically unverified. This study therefore aimed to collate and review all known records attributed to Chiridota Eschscholtz, 1829, and to conduct the first phylogenetic analysis into the relationship of these chiridotid holothurians across global chemosynthetic habitats. We show that Chiridota heheva Pawson & Vance, 2004 is a globally widespread, cosmopolitan holothurian that occupies all three types of deep-sea chemosynthetic ecosystem—hydrothermal vents, cold seeps and organic falls—as an organic-enrichment opportunist. Furthermore, we hypothesise that C. heheva may be synonymous with another vent-endemic chiridotid, Chiridota hydrothermica Smirnov et al., 2000, owing to the strong morphological, ecological and biogeographical parallels between the two species, and predict that any chiridotid holothurians subsequently discovered at global reducing environments will belong to this novel species complex. This study highlights the importance of understudied, peripheral taxa, such as holothurians, to provide insights to biogeography, connectivity and speciation at insular deep-sea habitats.
1867-1616
Thomas, Elin A.
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Liu, Ruoyu
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Amon, Diva
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Copley, Jon T.
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Glover, Adrian G.
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Helyar, Sarah J.
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Olu, Karine
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Wiklund, Helena
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Zhang, Haibin
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Sigwart, Julia D.
c7fae49b-7ba7-448a-bef1-b740640a4306
Thomas, Elin A.
38168d24-b12d-46d2-8ffc-7159d01eccf6
Liu, Ruoyu
9b6b1af1-d948-4ca0-9c55-aa406505e689
Amon, Diva
bcd41379-a74d-422a-be67-1c2ad974fef0
Copley, Jon T.
5f30e2a6-76c1-4150-9a42-dcfb8f5788ef
Glover, Adrian G.
91192a3a-fc25-4c1f-b062-2e4da183272e
Helyar, Sarah J.
378ddff1-47d6-4c86-97a5-f9c88ff90342
Olu, Karine
069834d4-fc76-423d-9e81-a433a21070f0
Wiklund, Helena
7c228af0-33a8-471f-b0f8-bc1e558cf8ed
Zhang, Haibin
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Sigwart, Julia D.
c7fae49b-7ba7-448a-bef1-b740640a4306

Thomas, Elin A., Liu, Ruoyu, Amon, Diva, Copley, Jon T., Glover, Adrian G., Helyar, Sarah J., Olu, Karine, Wiklund, Helena, Zhang, Haibin and Sigwart, Julia D. (2020) Chiridota heheva—the cosmopolitan holothurian. Marine Biodiversity, 50 (6), [110]. (doi:10.1007/s12526-020-01128-x).

Record type: Article

Abstract

Chemosynthetic ecosystems have long been acknowledged as key areas of enrichment for deep-sea life, supporting hundreds of endemic species. Echinoderms are among the most common taxa inhabiting the periphery of chemosynthetic environments, and of these, chiridotid holothurians are often the most frequently observed. Yet, published records of chiridotids in these habitats are often noted only as supplemental information to larger ecological studies and several remain taxonomically unverified. This study therefore aimed to collate and review all known records attributed to Chiridota Eschscholtz, 1829, and to conduct the first phylogenetic analysis into the relationship of these chiridotid holothurians across global chemosynthetic habitats. We show that Chiridota heheva Pawson & Vance, 2004 is a globally widespread, cosmopolitan holothurian that occupies all three types of deep-sea chemosynthetic ecosystem—hydrothermal vents, cold seeps and organic falls—as an organic-enrichment opportunist. Furthermore, we hypothesise that C. heheva may be synonymous with another vent-endemic chiridotid, Chiridota hydrothermica Smirnov et al., 2000, owing to the strong morphological, ecological and biogeographical parallels between the two species, and predict that any chiridotid holothurians subsequently discovered at global reducing environments will belong to this novel species complex. This study highlights the importance of understudied, peripheral taxa, such as holothurians, to provide insights to biogeography, connectivity and speciation at insular deep-sea habitats.

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Thomas 2020 Article Chiridota Heheva The Cosmopolitan - Version of Record
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Accepted/In Press date: 15 October 2020
e-pub ahead of print date: 20 November 2020
Published date: 2020

Identifiers

Local EPrints ID: 445234
URI: http://eprints.soton.ac.uk/id/eprint/445234
ISSN: 1867-1616
PURE UUID: ce6f1dfa-8352-4c41-9514-ef84d62e75cc
ORCID for Jon T. Copley: ORCID iD orcid.org/0000-0003-3333-4325

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Date deposited: 25 Nov 2020 17:33
Last modified: 18 Feb 2021 16:44

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Contributors

Author: Elin A. Thomas
Author: Ruoyu Liu
Author: Diva Amon
Author: Jon T. Copley ORCID iD
Author: Adrian G. Glover
Author: Sarah J. Helyar
Author: Karine Olu
Author: Helena Wiklund
Author: Haibin Zhang
Author: Julia D. Sigwart

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