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Issue: Vol. 5277 No. 2: 2 May 2023
Type: Article
Published: 2023-05-02
DOI: 10.11646/zootaxa.5277.2.2
Page range: 259-286
Abstract views: 550
PDF downloaded: 25

Redescription and molecular characterization of Mothocya parvostis Bruce, 1986 (Crustacea: Isopoda: Cymothoidae) parasitic on Japanese halfbeak, Hyporhamphus sajori (Temminck & Schlegel, 1846) (Hemiramphidae) with Mothocya sajori Bruce, 1986 placed into synonymy

Graduate School of Integrated Sciences for Life; Hiroshima University; 1-4-4 Kagamiyama; Higashi-Hiroshima; Hiroshima 739-8528; Japan
Takehara Station; Setouchi Field Science Center; Graduate School of Integrated Sciences for Life; Hiroshima University; 5-8-1 Minato- machi; Takehara; Hiroshima 725-0024; Japan
Graduate School of Integrated Sciences for Life; Hiroshima University; 1-4-4 Kagamiyama; Higashi-Hiroshima; Hiroshima 739-8528; Japan
Center for Marine Environmental Studies (CMES); Ehime University; 2-5 Bunkyo-cho; Matsuyama; Ehime; 790-8577; Japan
Seto Marine Biological Laboratory; Field Science Education and Research Center; Kyoto University; 459 Shirahama; Wakayama; 649-2211; Japan; Department of Zoology; Division of Biological Science; Graduate School of Science; Kyoto University; Kitashirakawa Oiwake-cho; Sakyo-ku; Kyoto 606-8502; Japan
Graduate School of Integrated Sciences for Life; Hiroshima University; 1-4-4 Kagamiyama; Higashi-Hiroshima; Hiroshima 739-8528; Japan
Takehara Station; Setouchi Field Science Center; Graduate School of Integrated Sciences for Life; Hiroshima University; 5-8-1 Minato- machi; Takehara; Hiroshima 725-0024; Japan
Crustacea Hyporhamphus sajori Japanese halfbeak parasite COI 16S rRNA

Abstract

Two species of Mothocya have previously been recorded from Hyporhamphus sajori: M. parvostis Bruce, 1986 and M. sajori Bruce, 1986. Mothocya parvostis is re-described based on the ovigerous female type and additional materials collected from the host from in and around the type locality. Morphological re-examination of fresh specimens and the type materials together with genetic data show that the M. sajori and M. parvostis are the same species, differing primarily in size, therefore we have placed Mothocya sajori Bruce, 1986 into a junior synonym of Mothocya parvostis Bruce, 1986. Mothocya parvostis is characterized by the following combinations of characters: 1) body slightly to moderately twisted to one side; 2) pereonite 7 posterior margin moderately to deeply recessed; 3) uropodal rami extending to pleotelson posterior margin; and 4) uropod rami bluntly rounded, exopod 1.5 times as long as peduncle. The differences of four morphological features for M. parvostis and M. sajori was quantified. Furthermore, a total of 635 isopods infesting H. sajori were collected from all over Japan to conduct quantitative morphological and molecular sequence analyses (mitochondrial cytochrome c oxidase subunit I and 16S rRNA). Although the four quantitative features did not overlap between the two species in type specimens, all quantitative morphological values of newly collected specimens in this study did not display a bimodal distribution. In addition, our molecular analyses found only a single clade for our newly collected specimens in neighbor-joining tree.

 

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