著者

角井 敬知

出版者

小樽市総合博物館

雑誌

小樽市総合博物館紀要

巻号頁・発行日

vol.35, pp.9-12, 2022-03-20

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I report predation of the tanaidacean crustacean Zeuxo ezoensis OKAMOTO et al., 2020 by a captive individual of Haliclystus tenuis KISHINOUYE, 1910 collected from algae in Oshoro Bay, Otaru, Hokkaido, Japan. The behavioral sequence was as follows. Immediately after Z. ezoensis touched the tentacles of H. tenuis, the latter rapidly folded its arms inward and trapped Z. ezoensis inside the calyx. The tanaidacean was digested by six hours after ingestion, except for the exoskeleton, which was ejected from the calyx eight hours after ingestion. Although no tanaidacean has previously been reported as prey for Staurozoa, Z. ezoensis is abundant on algae inhabited by H. tenuis in Oshoro Bay and would be exposed to predation by H. tenuis in the wild.

著者

角井 敬知 宗像 みずほ

出版者

小樽市総合博物館

雑誌

小樽市総合博物館紀要

巻号頁・発行日

vol.35, pp.13-16, 2022-03-20

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We found the ciliophoran protozoan Lagenophrys sp. to be symbiotic on the freshwater ostracod Cryptocandona sp., collected from Makkari, Hokkaido, Japan. In Japan, this is the third record of Lagenophrys and the first case from ostracods. We present a nucleotide sequence for the 18S rRNA gene (1,683 bp) from Lagenophrys sp. In an 18S maximum-likelihood tree that included 57 peritrichid sequences, Lagenophrys sp. grouped with the usconophryid Usconophrys sp.