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-Hemicytherura kajiyamai Hanai, 1957: A, B, E-H, female NIBRIV0000753777: LV internal view (A), RV internal view (B), muscular scar (right valve) (E), A1 (F), Md (G); A2 (H); C, D, male NIBRIV0000834103: LV internal view (C); RV internal view (D). Abbreviations: see Material and methods. Scale bars: 50 μm.
Source publication
Living cytheroid ostracod fauna from South Korea is very poorly known, and so far only 12 species have been reported in the taxonomic literature with detail description. We describe one new species, Xestoleberis hujeongensis n. sp., and report three other cytheroid ostracods: X. setouchiensisOkubo, 1979; X. sagamiensis Okubo, 1976; and Hemicytherur...
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Citations
... The superfamily Cytheroidea is by far the most diverse extant ostracod lineage found in both marine and freshwater environments, from littoral to deep-sea regions, and comprises 44 families, with majority of representatives known from the fossil record and, therefore, only after their shells (see references in Yoo et al. 2019a). Since the shell alone has a limited number of characters that tend to be homoplastic (see Karanovic et al. 2020 and references therein) there are a number of cytheroids lineages with unresolved phylogenetic position. ...
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.
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