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151503 - Two new xylophile cytheroid ostracods.pdf (6.11 MB)

Two new xylophile cytheroid ostracods (Crustacea) from Kuril-Kamchatka Trench, with remarks on the systematics and phylogeny of the family Keysercytheridae, Limnocytheridae, and Paradoxostomatidae

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posted on 2023-05-21, 10:13 authored by Tanaka, H, Yoo, H, Pham, HTM, Ivana Karanovic

Keysercythere reticulata sp. nov. and Redekea abyssalis sp. nov., collected from the wood fall submerged in the Kuril-Kamchatka Trench (Northwestern Pacific), are only the second records of the naturally occurring, wood-associated ostracod fauna from a depth of over 5000 m. At the same time, K. reticulata is the second and R. abyssalis is the third representative of their respective genera. While Keysercythere Karanovic and Brandão, 2015 species are free-living, deep-sea taxa, all Redekea de Vos, 1953 live symbiotically on the body surface of wood-boring isopods, Limnoria spp. Since R. abyssalis is the only genus representative found in the deep sea, we hypothesize that its ancestor colonized this ecosystem as a result of the symbiotic relationship. Newly collected material enabled us to update molecular phylogeny of Cythreoidea based on 18S rRNA gene sequences, especially to clarify the current systematics of the families Keysercytheridae, Limnocytheridae, and Paradoxostomatidae. The resulting phylogenetic tree supports a close relationship between Keysercythere and Redekea and a distant relationship between two Limnocytheridae lineages, Timiriaseviinae and Limnocytherinae. Consequently, we propose a transfer of Redekea from Paradoxostomatidae to Keysercytheridae, and erecting of the two limnocytherid subfamilies onto the family level. The phylogenetic analysis also implies a close relationship between the nominal Limnocytherinae genus and Keysercythere+Redekea clade, albeit with a low posterior probability, requiring further studies to clarify this.

History

Publication title

Arthropod Systematics and Phylogeny

Volume

79

Pagination

171-188

ISSN

1863-7221

Department/School

Institute for Marine and Antarctic Studies

Publisher

Senckenberg Gesellschaft fuer Naturforschung, Senckenberg Nature Research Society

Place of publication

Germany

Rights statement

© 2021 The Authors(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0). https://creativecommons.org/licenses/by/4.0/

Repository Status

  • Open

Socio-economic Objectives

Marine biodiversity

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