Mothocya parvostis Bruce 1986

Autor: Fujita, Hiroki, Aneesh, Panakkool Thamban, Kawai, Kentaro, Kitamura, Shin-Ichi, Shimomura, Michitaka, Umino, Tetsuya, Ohtsuka, Susumu
Rok vydání: 2023
Předmět:
DOI: 10.5281/zenodo.7892200
Popis: Mothocya parvostis Bruce, 1986 [Standard Japanese name: Sayori-yadori-mushi] (Figs. 3 – 14) Mothocya parvostis Bruce, 1986: 1005–1008, figs.6–7; Yamauchi & Nunomura, 2010: 73, figs. 9–11; Kawanishi, Sogabe, Nishimoto & Hata, 2016: 13; Yamauchi & Kashio, 2018: 56; Hata, Sogabe, Tada, Nishimoto, Nakano, Kohya, Takeshima & Kawanishi, 2017: 104; Fujita, Kawai, Taniguchi Tomano, Sanchez, Kuramochi & Umino, 2020: 6, figs. 7–8; Nagasawa, 2020a: 52, figs, 6–7; Nagasawa & Uenoyama, 2022: 138–141, figs. 2–5; Fujita, Kawai, Deville & Umino, 2023a: fig. 3; 2023b: fig. 2–3. Irona melanosticta Schioedte & Meinert, 1884: 388 (part); Thielemann, 1910: 45, figs 28, 29; Hiraiwa, 1934: 382, fig. 2; Gurjanova, 1936: 94, fig. 50; Inouye, 1941: 219, figs 1-14, pis 1–3; Shiino, 1951: 87, fig. IE, IF; 1965; Nunomura, 1981: 55; Hattori & Seki, 1956: 442; Kussakin, 1979: 308, figs 174, 175; Hatai & Yasumotu, 1980: 87 figs 1–4; 1981: 77; 1982a: 75; 1982b: 147. Irona sp. Nunomura, 1981: 55, fig. 10. Mothocya sajori Bruce, 1986: 1143–1145, fig. 30; Yamauchi & Kashio, 2018: 57; Nagasawa & Tawa, 2020: 68, figs. 1–2 [new synonymy]. Material examined: 370 females; 163 males; 52 transitionals. Type material: Paratypes of M.parvostis- TOYA-Cr4102, 9.1 mm, transitional, host S. quinqueradiata, collected in Nagasaki by K. Hatai; TOYA-Cr4122, 11.5 mm, host H. sajori, collected in Imizu City, Toyama Prefecture by H. Kuroda. Paratypes of M. sajori- female, TOYA-Cr4082, 27.0 mm, female, host H. sajori. Additional materials: TOYA-Cr4101, 9.5 mm, transitional, host S. quinqueradiata, collected in Nagasaki by K. Hatai; female, TOYA-Cr4123, 12.2 mm, host H. sajori, collected in Imizu City, Toyama Prefecture by H. Kuroda. HUM-Iso-00001, 26.3 mm, host H. sajori collected in the Shikokuchuo City, Ehime Prefecture by H. Fujita; HUM-Iso-00002, 13.5 mm, host H. sajori collected off Tokyo by H. Fujita; HUM-Iso-00003, 14.7 mm, host H. sajori collected in Nagayo City, Nagasaki Prefecture by H. Fujita (HUM: Hiroshima University Museum, Hiroshima, Japan). Redescription of female (Figs 3, 4A–B, 5–12): Body 2.0 – 2.2 times as long as greatest width, dorsal surfaces convex, widest at pereonite 4, most narrow at pereonite 1. Cephalon 2.1–2.5 times wider than long, anterior margin evenly rounded or slightly pointed, moderately immersed in pereonite 1. Frontal margin with weakly produced rostrum. Eyes oval with distinct margins, one eye 0.3 times width of cephalon; 0.7 times length of cephalon. Pereonite 1 anterior margin medially straight, slightly curved laterally; anterolateral angles produced. Coxae 2–7 visible in dorsal view; coxae posterior margins rounded, lateral margins straight or weakly convex; coxae of pereonite 6 equal, 7 extending slightly beyond posterior of segment. Pereonites 1–7, gradually decreasing length; posterior margins smooth, slightly curved laterally; pereonites 7 with recessed posterior margin, extending pleonite 1 lateral margin. Pleon short, 12% (body length) BL or less, pleonites all visible in dorsal view, pleon wide, 0.9–1.0 times as wide as pereon max. width; pleonite 1 largely concealed by pereonite 7. Pleotelson with indistinct longitudinal median ridge; posterior margin broadly rounded; 0.8 times as long as pereonite 7, 0.6–0.7 times as long as anterior width. Antennula with 8 articles; article 1 widest; articles 1–3 more robust than 4–8; articles 1, 1.2 times as wide as long; article 2, 1.6 times as wide as long; article 3, 1.4 times as long as wide; 5–8 gradually decreasing the length and width; article 8 with few terminal setae. Antenna with 8 articles; article 1 widest; articles 2–8, subequal in length and width; terminal article shortest, with few terminal setae. Mandibular with molar process; palp article 1 longest, 1.4 times as long as wide; article 2, 0.7 times as long as article 1, 1.5 times as long as wide; article 3 shortest, narrow, 0.7 times as long as article 2, 1.3 times as long as wide, 0.5 times as wide as article 1. Maxillula simple with 4 terminal robust setae (RS). Maxilla mesial lobe and lateral lobe each with 2 RS. Maxilliped without oostegite lobe; article 2 without setae, article 3 with three large terminal RS, and two RS on proximal posterior surface. Pereopod 1 basis 1.1 times as long as greatest width; ischium 0.7 times as long as basis; merus 0.3 times as long as wide, 0.2 times as long as ischium; carpus 0.5 times as long as wide; propodus 1.2 times as long as wide; dactylus 1.2 times as long as propodus, 2.1 times as long as proximal width. Pereopod 2 basis 1.2 times as long as greatest width; ischium 0.9 times as long as basis, 1.7 times as long as wide; propodus 1.5 times as long as wide, 0.8 times as long as ischium; dactylus 1.8 times as long as propodus, 3.0 times as long as proximal width. Pereopod 3 basis 1.2 times as long as greatest width, ischium as long as basis, 1.6 times as long as greatest width; carpus 0.7 times as long as wide; propodus 1.8 times as long as wide, as long as ischium; dactylus as long as propodus, 2.9 times as long as greatest width. Pereopod 4 similar to 3. Pereopod 5 basis 2.0 times as long as greatest width, ischium 0.7 times as long as basis, 1.9 times as long as greatest width; merus 0.4 times as long as wide, 0.2 times as long as ischium; propodus 1.1 times as long as wide; dactylus 1.7 times as long as propodus, 2.7 times as long as greatest width. Pereopod 6 basis 1.4 times as long as greatest width, ischium 0.9 times as long as basis, 1.9 times as long as greatest width; merus 0.6 times as long as wide, 0.4 times as long as ischium; carpus 0.6 times as long as wide; propodus 1.3 times as long as wide; dactylus 1.5 times as long as propodus, 2.9 times as long as greatest width. Pereopod 7 basis 1.3 times as long as greatest width; ischium as long as basis, 2.3 times as long as wide; merus 0.6 as long as wide, 0.3 times as long as ischium; carpus 0.7 times as long as wide, 0.3 times as long as ischium; propodus 1.6 times as long as wide, 0.7 times as long as ischium; dactylus 1.2 times as long as propodus, 3.2 times as long as basal width. Brood pouch typical of the genus. Pleopod peduncles narrow; pleopods 3–5 endopod proximomedial lobes moderately developed, 5 slightly larger than that of pleopod 4. Pleopod 1 exopod 0.9 times as long as wide, distally rounded, mesial margin convex; endopod as long as exopod, 1.1 times as long as wide, lateral margin weakly convex; peduncle 2.6 times as wide as long. Pleopod 2 exopod as long as wide, lateral margin convex, distally rounded, mesial margin convex; endopod as long as exopod, 1.2 times as long as wide, lateral margin weakly convex, distally broadly rounded; peduncle 3.8 times as wide as long. Pleopod 4 exopod 0.9 times as long as wide; endopod 1.1 times as long as exopod, 1.1 times as long as wide. Pleopod 5 exopod 1.2 times as long as wide, lateral margin convex, distally rounded, mesial margin convex; endopod 0.9 times as long as exopod, 1.3 times as long as wide, lateral margin weakly convex, distally broadly rounded. Uropod rami broad, bluntly rounded, as long as or just beyond posterior margin of pleotelson; uropod, peduncle 0.6 times as long as exopod, as long as wide. Endopod 2.7 times as long as greatest width, 0.6 as long as exopod. Exopod 3.6 times as long as greatest width, 1.7 times as long as peduncle. Male (Figs 4C, 13A–D): Body 2.4 times as long as greatest width, widest at pereonite 3. Cephalon 1.8 times wider than long, broadly rounded, not immersed in pereonite 1. Eyes oval with distinct margins, one eye 0.4 times width of cephalon. Pereonite 1 longest, 7 shortest; pereonite gradually decreasing the length and width from 3–7. Coxae 2–7 visible in dorsal view; shorter than pereonites. Pleon short, 12% BL or less, pleonites all visible in dorsal view, pleon wide, 0.7 as wide as pereon max. width; pleonite 5 longest. Pleotelson apical margin rounded, nearly as wide as pereonite 7; 0.8 times as long as anterior width. Uropod 1.4 times as long as pleotelson; uropods, equal in size. Uropod rami, endopod, 0.6 times as long as exopod, lateral margin convex. Exopod apically rounded, 2.2 times as long as peduncle, 1.6 times as long as endopod. Pleopod 2 with appendix masculina, longer 1.1 times as long as endopod. Penis well developed. Transitional (Figs 13E–F, 14): Body 2 times as long as wide; straight. Eyes distinct, one eye 0.4 times as wide as cephalon. Cephalon 2.0–2.2 times wider than long, anterior margin evenly rounded, moderately immersed in pereonite 1. Pereonites, pleonites, in between male and female. Antennula, antenna similar to those of the female. Pleotelson 0.8 times as long as anterior width. Pereopods in between female and male. Pleopod 2, similar to male; Uropods slightly longer than pleotelson posterior margin, in between male and female; rami similar to male. Penis, not distinct. Coloration: Body coloration varies from pale yellow to grey in preservation ethanol. Hosts: Cage-cultured Seriola quinqueradiata and Girella punctata, wild Hyporhamphus sajori, and juveniles of Acanthopagrus schlegelii, Acanthopagrus latus, and Hypoatherina tsurugae (Bruce 1986; Saito & Yoneji 2000; Fujita et al. 2020, 2023b). Distribution: Known from Japanese waters (Yamagata, Miyagi, Toyama, Osaka and Kagoshima Prefectures, Tokyo Bay and the Seto Inland Sea) (Bruce 1986; Kawanishi et al. 2016; Yamauchi & Kashio 2018) and Korean waters (Yeosu City) (Inoue 1941). Remarks: Mothocya parvostis can be separated from other congeners 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) uropod uropodal rami extending to pleotelson posterior margin; 4) uropod rami bluntly rounded; 5) exopod 1.5 times as long as peduncle. The present study re-described Mothocya parvostis based on the type specimens and fresh materials collected from the type locality.We also thoroughly examined and compared the type specimens of M. sajori.All morphological characters of Mothocya parvostis and the type material of M. sajori showed substantial similarity. Only variation in body twisting was found; the smaller individuals less twisted than larger individuals. According to Aneesh et al. (2016, 2018, 2020), body hunching of cymothoids depends on the site of attachment and in which branchial cavity the cymothoid is attached. If the cymothoid is attached in the right branchial cavity, the body will be twisted towards the left side and verse visa. Furthermore, the degree of twisting in branchial cymothoids is dependant on the size of the animal; to safely settle in the branchial cavity, the larger animal needs more twisting than the smaller one. The present morphological study clearly states that M.sajori should be treated as a junior synonym of M. parvostis.
Published as part of Fujita, Hiroki, Aneesh, Panakkool Thamban, Kawai, Kentaro, Kitamura, Shin-Ichi, Shimomura, Michitaka, Umino, Tetsuya & Ohtsuka, Susumu, 2023, 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, pp. 259-286 in Zootaxa 5277 (2) on pages 265-276, DOI: 10.11646/zootaxa.5277.2.2, http://zenodo.org/record/7889641
{"references":["Bruce, N. L. (1986) Revision of the isopod crustacean genus Mothocya Costa, in Hope, 1851 (Cymothoidae: Flabellifera), parasitic on marine fishes. Journal of Natural History, 20 (5), 1089 - 1192. https: // doi. org / 10.1080 / 00222938600770781","Yamauchi, T. & Nunomura, N. (2010) Cymothoid isopods (Crustacea: Isopoda) collected by Dr. Y. Kano in Toyama Bay of the Sea of Japan. Bulletin of the Toyama Science Museum, 33, 71 - 76.","Kawanishi, R., Sogabe, A., Nishimoto, R. & Hata, H. (2016) Spatial variation in the parasitic isopod load of the Japanese halfbeak in western Japan. Diseases of Aquatic Organisms, 122 (1), 13 - 19. https: // doi. org / 10.3354 / dao 03064","Yamauchi, T. & Kashio, S. (2018) Cymothoid isopods (Crustacea) preserved in Natural History Museum, Kishiwada City, Japan. Bulletin of the Natural History Museum, Kishiwada City, 5, 55 - 57.","Hata, H., Sogabe, A., Tada, S., Nishimoto, R., Nakano, R., Kohya, N., Takeshima H. & Kawanishi, R. (2017) Molecular phylogeny of obligate fish parasites of the family Cymothoidae (Isopoda, Crustacea): evolution of the attachment mode to host fish and the habitat shift from saline water to freshwater. Marine Biology, 164 (5), 105. https: // doi. org / 10.1007 / s 00227 - 017 - 3138 - 5","Fujita, H., Kawai, K., Taniguchi, R., Tomano, S., Sanchez, G., Kuramochi, T. & Umino, T. (2020) Infestation of the parasitic isopod Mothocya parvostis on juveniles of the black sea bream Acanthopagrus schlegelii as an optional intermediate host in Hiroshima Bay. Zoological Science, 37 (6), 544 - 553. https: // doi. org / 10.2108 / zs 190147","Nagasawa, K. (2020 a) Mothocya parvostis (Isopoda: Cymothoidae) parasitic on Japanese halfbeak, Hyporhamphus sajori, in the central Seto Inland Sea, Japan, with a brief summary of the hosts, geographical distribution, and pathogenic effects of the isopod. Nature of Kagoshima, 47, 51 - 57.","Nagasawa, K. & M. Uenoyama. (2022) Mothocya parvostis (Isopoda: Cymothoidae), a branchial cavity parasite of Japanese halfbeak, Hyporhamphus sajori, in Tsuruga Bay, central Japan, with a discussion of the taxonomic status of Mothocya sajori. Nature of Kagoshima, 49, 105 - 111. [in Japanese with English abstract]","Fujita, H., Kawai, K., Deville, D. & Umino, T. (2023 a) Quatrefoil light traps for free-swimming stages of cymothoid parasitic isopods and seasonal variation in their species compositions in the Seto Inland Sea, Japan. International Journal for Parasitology: Parasites and Wildlife, 20, 12 - 19. https: // doi. org / 10.1016 / j. ijppaw. 2022.12.002","Schioedte, J. C. & Meinert, F. W. (1884) Symbolae ad monographiam Cymothoarum isopodum familiae 4. Cymothoidae. Trib. II. Cymothoinae. Trib. III. Livonecinae. Naturhistorisk Tidsskrift, 14 (3), 221 - 454.","Thielemann, M. (1910) Beitrage zur Kenntnis der Isopodenfauna Ostasiens. Beitrage zur Naturgeschichte Ostasiens. Abhandlungen der Mathematisch-Physkalischen Klasse der Koeniglich Bayerisch Akademie der Wissenschaftliche, 2 suppl. - bund 3, 1 - 110.","Hiraiwa, Y. K. (1934) Rhexana verrucosa and Irona melanosticta. Botany and Zoology, 2 (2), 380 - 384. [in Japanese]","Gurjanova, E. F. (1936) Crustacees. Isopoda des mers Orientals. Faune de L'URSS, 7.3, 1 - 278.","Shiino, S. M. (1951) On the cymothoid Isopoda parasitic on Japanese fishes. Bulletin of the Japanese Society of Scientific Fisheries, 16, 81 - 89. https: // doi. org / 10.2331 / suisan. 16.12 _ 81","Nunomura, N. (1981) Isopod crustacean in Sado Island, the Sea of Japan. Annual Report of Sado Marine Biological Station Niigata University, 11, 43 - 62.","Hattori, J. & Seki, M. (1956) An isopod, Irona melanosticta parasitic on Hemirhamphus sajori (T. & S.) and its influence on the hosts. Dobutsugaku Zasshi, 65, 422 - 425.","Kussakin, O. G. (1979) Marine and Brackish Water Isopod Crustacea. Suborder Flabellifera. Akademy of Science, USSR, Leningrad, 470 pp. [in Russian]","Hatai, K. & Yasumotu, S. (1980) A parasitic isopod Irona melanosticta isolated from the gill chamber of fingerlings of cultured Yellowtail, Seriola quinqueradiata. Bulletin of the Nagasaki Prefectural Institute of Fisheries, 6, 87 - 96. [in Japanese]","Nagasawa, K. & Tawa, A. (2020) Mothocya sajori (Isopoda: Cymothoidae) from Japanese halfbeak, Hyporhamphus sajori, purchased at a local supermarket in central Japan, with a note on identification of M. sajori and its closely related species M. parvostis. Nature of Kagoshima, 47, 67 - 73. [in Japanese with English abstract]","Saito N. & Yoneji T. (2000) The genus of Mothocya (Isopoda: Cymothoidae) parasitic on black sea bream juveniles Acanthopagrus schlegelii. Umiushi-tsushin, 29, 4 - 6. [in Japanese]","Fujita, H., Kawai, K., Deville, D. & Umino, T. (2023 b) Molecular and morphological characterizations of the fish parasitic isopod Mothocya parvostis (Isopoda: Cymothoidae) parasitizing optional intermediate hosts: juveniles of the cobaltcap silverside Hypoatherina tsurugae and yellowfin seabream Acanthopagrus latus. Zoological Studies, 62, e 21.","Inoue, M. (1941) On sexuality in Cymothoidae, Isopoda II Irona melanosticta Schoedte & Meinert parasitic in the branchial cavity of the halfbeak, Hyporhamphus sajori (Temminck & Schlegel). Journal of Science of the Hiroshima University, Series B, Division 1 (9), 219 - 238.","Aneesh, P. T., Kappalli, S., Helna, A. K. & Anilkumar, G. (2016) Mothocya renardi (Bleeker, 1857) (Crustacea: Isopoda: Cymothoidae) parasitizing Strongylura leiura (Bleeker) (Belonidae) off the Malabar coast of India: Redescription, occurrence and life-cycle. Systematic Parasitology, 93 (6), 583 - 599. https: // doi. org / 10.1007 / s 11230 - 016 - 9646 - 8"]}
Databáze: OpenAIRE
Externí odkaz: