{"title":"First Japanese Records of Sardinella albella (Teleostei: Clupeiformes: Clupeidae) from Okinawa Island, with a Key to Japanese Species of Sardinella","authors":"H. Hata, K. Koeda","doi":"10.12782/specdiv.27.37","DOIUrl":"https://doi.org/10.12782/specdiv.27.37","url":null,"abstract":"","PeriodicalId":37692,"journal":{"name":"Species Diversity","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47708413","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The epistylidid ciliate Epistylis wuhanensis Wang, Zhou, Guo, and Gu, 2017 was found attached to the body surface of Lernaea cyprinacea Linnaeus, 1758 (Copepoda: Lernaeidae) parasitizing Rhinogobius similis Gill, 1859 (Perciformes: Gobiidae) from the Arida River in Wakayama Prefecture, Japan. This epistylidid was described based on live ciliates, stained specimens, and scanning electron microscope observation with molecular information. This is the first record of E. wuhanensis from Japan and the second record of the epistylidid attached to metazoans. A list of records of Epistylis Ehrenberg, 1830 species attached to metazoans in Japan is proposed.
{"title":"First Japanese Record of Epistylis wuhanensis (Ciliophora: Epistylididae) Attached to Lernaea cyprinacea (Copepoda), with a List of Epistylis Species Attached to Metazoans in Japan","authors":"Masato Nitta","doi":"10.12782/specdiv.27.61","DOIUrl":"https://doi.org/10.12782/specdiv.27.61","url":null,"abstract":"The epistylidid ciliate Epistylis wuhanensis Wang, Zhou, Guo, and Gu, 2017 was found attached to the body surface of Lernaea cyprinacea Linnaeus, 1758 (Copepoda: Lernaeidae) parasitizing Rhinogobius similis Gill, 1859 (Perciformes: Gobiidae) from the Arida River in Wakayama Prefecture, Japan. This epistylidid was described based on live ciliates, stained specimens, and scanning electron microscope observation with molecular information. This is the first record of E. wuhanensis from Japan and the second record of the epistylidid attached to metazoans. A list of records of Epistylis Ehrenberg, 1830 species attached to metazoans in Japan is proposed.","PeriodicalId":37692,"journal":{"name":"Species Diversity","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42975343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Twenty-four specimens (184.6–243.6 mm in standard length) of Monotaxis Anonymous [Bennett], 1830, collected from the Ryukyu Islands, southern Japan, were identified as M. heterodon (Bleeker, 1854) (Perciformes: Lethrinidae). Although a widely distributed Indo-West Pacific species, all previous records from Japanese waters have been based solely on photographs, the present specimens therefore representing the first specimen-based records of M. heterodon from Japan. A detailed comparison between M. heterodon and its only congener, M. grandoculis (Forsskål, 1775), from which it has previously been distinguished primarily by scale rows below the lateral line and fresh or live coloration, revealed new diagnostic characters, most of which are applicable to preserved specimens. In addition to previously recognized characters, the two species can be distinguished by mid-dorsal snout profile in adults (concave vs. straight), snout length (excluding lips) [8.9–11.1 (mean 9.9) % of SL vs. 10.3–12.1 (11.2) % SL], spinous anal-fin base length [4.6–5.9 (5.0) % of SL vs. 3.9–4.9 (4.4) % SL], a distinct black blotch above the pupil (absent vs. present), a dark brown stripe across the post interorbital region in preserved specimens (present vs. absent), and preserved coloration of the pectoral-fin base inner surface (blackish brown vs. light brown).
从日本南部琉球群岛采集的24个Monotaxis Anonymous【Bennett】标本（184.6–243.6 mm标准长度），1830年，被鉴定为M.heterdon（Bleeker，1854）（鲈形目：石首鱼科）。尽管印度-西太平洋物种分布广泛，但日本水域以前的所有记录都仅基于照片，因此，目前的标本代表了来自日本的第一个基于标本的M.heterdon记录。异狄氏乳杆菌与其唯一的同类大眼乳杆菌（Forsskål，1775）之间的详细比较揭示了新的诊断特征，其中大多数适用于保存的标本。除了先前识别的特征外，这两个物种还可以通过成人的中背吻轮廓（凹形与直形）、吻长（不包括嘴唇）[8.9-11.1（平均9.9）%SL vs.10.3-12.1（11.2）%SL]、棘臀鳍基部长度[4.6-5.9（5.0）%SL vs 3.9-4.9（4.4）%SL]、瞳孔上方明显的黑色斑点（不存在与存在）来区分，在保存的标本中，眶间后区域有一条深棕色条纹（存在与否），胸鳍基部内表面有保存的颜色（黑棕色与浅棕色）。
{"title":"First Specimen-based Records of Redfin Emperor Monotaxis heterodon (Perciformes: Lethrinidae) from Japan, with New Diagnostic Characters Applicable to Identification of Preserved Specimens","authors":"Shunta Shibuya, Y. Sakurai, H. Motomura","doi":"10.12782/specdiv.27.45","DOIUrl":"https://doi.org/10.12782/specdiv.27.45","url":null,"abstract":"Twenty-four specimens (184.6–243.6 mm in standard length) of Monotaxis Anonymous [Bennett], 1830, collected from the Ryukyu Islands, southern Japan, were identified as M. heterodon (Bleeker, 1854) (Perciformes: Lethrinidae). Although a widely distributed Indo-West Pacific species, all previous records from Japanese waters have been based solely on photographs, the present specimens therefore representing the first specimen-based records of M. heterodon from Japan. A detailed comparison between M. heterodon and its only congener, M. grandoculis (Forsskål, 1775), from which it has previously been distinguished primarily by scale rows below the lateral line and fresh or live coloration, revealed new diagnostic characters, most of which are applicable to preserved specimens. In addition to previously recognized characters, the two species can be distinguished by mid-dorsal snout profile in adults (concave vs. straight), snout length (excluding lips) [8.9–11.1 (mean 9.9) % of SL vs. 10.3–12.1 (11.2) % SL], spinous anal-fin base length [4.6–5.9 (5.0) % of SL vs. 3.9–4.9 (4.4) % SL], a distinct black blotch above the pupil (absent vs. present), a dark brown stripe across the post interorbital region in preserved specimens (present vs. absent), and preserved coloration of the pectoral-fin base inner surface (blackish brown vs. light brown).","PeriodicalId":37692,"journal":{"name":"Species Diversity","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46517988","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The taxonomic status of the two Japanese species of the spider genus Cybaeus L. Koch, 1868, viz., C. communis Yaginuma, 1972 and C. maculosus Yaginuma, 1972, is revisited on the basis of male and female specimens, which were collected from each type locality and the adjacent areas, along with the holotypes of both species. Mitochondrial cytochrome c oxidase subunit I and nuclear internal transcribed spacer 1 sequence data confirmed that C. communis and C. maculosus are conspecific, and C. maculosus is synonymized with C. communis. The obtained molecular phylogenies corroborate the monophyly of C. communis, C. kirigaminensis Komatsu, 1963, C. shinkaii (Komatsu, 1970), and C. daimonji Matsuda, Ihara, and Nakano, 2020.
{"title":"Taxonomic Reassessment of Cybaeus communis and Cybaeus maculosus (Araneae: Cybaeidae) from Central Honshu, Japan","authors":"Y. Sugawara, Y. Ihara, T. Nakano","doi":"10.12782/specdiv.27.53","DOIUrl":"https://doi.org/10.12782/specdiv.27.53","url":null,"abstract":"The taxonomic status of the two Japanese species of the spider genus Cybaeus L. Koch, 1868, viz., C. communis Yaginuma, 1972 and C. maculosus Yaginuma, 1972, is revisited on the basis of male and female specimens, which were collected from each type locality and the adjacent areas, along with the holotypes of both species. Mitochondrial cytochrome c oxidase subunit I and nuclear internal transcribed spacer 1 sequence data confirmed that C. communis and C. maculosus are conspecific, and C. maculosus is synonymized with C. communis. The obtained molecular phylogenies corroborate the monophyly of C. communis, C. kirigaminensis Komatsu, 1963, C. shinkaii (Komatsu, 1970), and C. daimonji Matsuda, Ihara, and Nakano, 2020.","PeriodicalId":37692,"journal":{"name":"Species Diversity","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44611752","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Seven specimens (149.0–221.2 mm standard length) of Pristipomoides amoenus (Snyder, 1911), previously known only from Okinawa-jima and Ishigaki-jima islands, southern Ryukyu Islands, Okinawa Prefecture, Japan, were collected from other regions of Japan (Amami-oshima island, Amami Islands, Kagoshima Prefecture), Taiwan (Dong-gang, Pingtung), the Philippines (Iloilo, Panay Island), and Fiji (Viti Levu Island), thereby representing the first records of the species from outside Okinawa Prefecture. The Amami-oshima and Fijian specimens also represent the northernmost and first Southern Hemisphere records, respectively, for the species. Comparison of these plus newly collected specimens from the southern Ryukyu Islands (herein described in detail) with the closely related species Pristipomoides argyrogrammicus (Valenciennes in Cuvier and Valenciennes, 1832) revealed the following hitherto unrecognized diagnostic color features of P. amoenus: a few small silvery-blue blotches present inside yellow saddles on dorsum; small silvery-blue blotches below trunk lateral line absent or indistinct; a distinct line (formed by small silvery-blue blotches) absent on lower caudal peduncle; a large silveryblue blotch present on upper opercle, extending anteriorly beyond preopercular margin; a line formed by small silvery-blue blotches on upper caudal peduncle ending at upper caudal-fin base; a pair of lines formed by small silvery-blue blotches along dorsal-fin base (dorsal view); a larger pair of elliptical silvery-blue blotches on occipital region (all silvery-blue blotches retained as dark-brown blotches after preservation). Pristipomoides argyrogrammicus is newly recorded from the Tokara Islands, northern Ryukyu Islands, Japan.
{"title":"Distributional Range Extension of the Pale Ornate Jobfish Pristipomoides amoenus (Teleostei: Perciformes: Lutjanidae) in the Western Pacific Ocean, with Notes on Newly Recognized Diagnostic Coloration","authors":"Ryuichi Nakagawa, Y. Sakurai, H. Motomura","doi":"10.12782/specdiv.27.15","DOIUrl":"https://doi.org/10.12782/specdiv.27.15","url":null,"abstract":"Seven specimens (149.0–221.2 mm standard length) of Pristipomoides amoenus (Snyder, 1911), previously known only from Okinawa-jima and Ishigaki-jima islands, southern Ryukyu Islands, Okinawa Prefecture, Japan, were collected from other regions of Japan (Amami-oshima island, Amami Islands, Kagoshima Prefecture), Taiwan (Dong-gang, Pingtung), the Philippines (Iloilo, Panay Island), and Fiji (Viti Levu Island), thereby representing the first records of the species from outside Okinawa Prefecture. The Amami-oshima and Fijian specimens also represent the northernmost and first Southern Hemisphere records, respectively, for the species. Comparison of these plus newly collected specimens from the southern Ryukyu Islands (herein described in detail) with the closely related species Pristipomoides argyrogrammicus (Valenciennes in Cuvier and Valenciennes, 1832) revealed the following hitherto unrecognized diagnostic color features of P. amoenus: a few small silvery-blue blotches present inside yellow saddles on dorsum; small silvery-blue blotches below trunk lateral line absent or indistinct; a distinct line (formed by small silvery-blue blotches) absent on lower caudal peduncle; a large silveryblue blotch present on upper opercle, extending anteriorly beyond preopercular margin; a line formed by small silvery-blue blotches on upper caudal peduncle ending at upper caudal-fin base; a pair of lines formed by small silvery-blue blotches along dorsal-fin base (dorsal view); a larger pair of elliptical silvery-blue blotches on occipital region (all silvery-blue blotches retained as dark-brown blotches after preservation). Pristipomoides argyrogrammicus is newly recorded from the Tokara Islands, northern Ryukyu Islands, Japan.","PeriodicalId":37692,"journal":{"name":"Species Diversity","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42935668","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
1 Fisheries Technology Institute, Japan Fisheries Research and Education Agency, 1551-8 Taira-machi, Nagasaki 851-2213, Japan E-mail: hoshinok@affrc.go.jp 2 Tokyo University of Marine Science and Technology, 4-5-7 Kohnan, Minato-ku, Tokyo 108-8477, Japan 3 National Research Institute of Far Seas Fisheries, Japan Fisheries Research and Education Agency, 2-12-4 Fukuura, Kanazawa-ku, Yokohama, Kanagawa 236-8648, Japan 4 Present Address: Fisheries Resources Institute, Japan Fisheries Research and Education Agency, 2-12-4 Fukuura, Kanazawa-ku, Yokohama, Kanagawa 236-8648, Japan 5 Present Address: Graduate School of Fisheries and Environmental Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan 6 Corresponding author
{"title":"Identification of the Commercially Important Oreosomatid Fish (Zeiformes: Teleostei) of the Emperor Seamounts, with Comments on Diagnostic Characters of the Species","authors":"K. Hoshino, Kunpei Kosaka, K. Sawada, M. Kiyota","doi":"10.12782/specdiv.27.1","DOIUrl":"https://doi.org/10.12782/specdiv.27.1","url":null,"abstract":"1 Fisheries Technology Institute, Japan Fisheries Research and Education Agency, 1551-8 Taira-machi, Nagasaki 851-2213, Japan E-mail: hoshinok@affrc.go.jp 2 Tokyo University of Marine Science and Technology, 4-5-7 Kohnan, Minato-ku, Tokyo 108-8477, Japan 3 National Research Institute of Far Seas Fisheries, Japan Fisheries Research and Education Agency, 2-12-4 Fukuura, Kanazawa-ku, Yokohama, Kanagawa 236-8648, Japan 4 Present Address: Fisheries Resources Institute, Japan Fisheries Research and Education Agency, 2-12-4 Fukuura, Kanazawa-ku, Yokohama, Kanagawa 236-8648, Japan 5 Present Address: Graduate School of Fisheries and Environmental Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan 6 Corresponding author","PeriodicalId":37692,"journal":{"name":"Species Diversity","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41684626","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The three heteronemertean nominal species Ascaris longissima Gunnerus, 1770, Borlasia angliae Oken, 1815, and Nemertes borlasii Cuvier, 1816 have been considered as synonymous, denoting the same species to which the valid name Lineus longissimus (Gunnerus, 1770) has been applied. These three nominal species are the type species of the genus-group names Lineus Sowerby, 1806, Borlasia Oken, 1815, and Nemertes Cuver, 1816, respectively, which are in turn the type genera of the family-group names Lineidae McIntosh, 1874, Borlasiidae Diesing, 1862, and Nemertidae Ehrenberg, 1831. Therefore, Lineus Sowerby, 1806 (currently in use) is a senior subjective synonym of Borlasia Oken, 1815 and Nemertes Cuvier, 1816 (both currently not in use), while Lineidae McIntosh, 1874 (currently in use) is a junior subjective synonym of Borlasiidae Diesing, 1862 and Nemertidae Ehrenberg, 1831 (both currently not in use); in addition, Micruridae Ehrenberg, 1831 (not in use) is also a senior synonym of Lineidae McIntosh, 1874. Borlasiidae Diesing, 1862 and Nemertidae Ehrenberg, 1831 have not been used as valid after 1899, while Lineidae McIntosh, 1874 has been used in at least 216 works published by 437 authors since 1971 until 2021, thus satisfying the conditions stipulated in Article 23.9.1 of the International Code of Zoological Nomenclature. Borlasiidae Diesing, 1862 and Nemertidae Ehrenberg, 1831 are herein declared nomina oblita with respect to Lineidae McIntosh, 1874, the latter being regarded as a nomen protectum under Article 23.9.2 of the International Code of Zoological Nomenclature. However, reversed precedence of Lineidae McIntosh, 1874 over its senior synonym Micruridae Ehrenberg, 1831 requires a ruling by the International Commission on Zoological Nomenclature, as the latter name was used as valid between 1998 and 2009
{"title":"Reversal of Precedence for Lineidae McIntosh, 1874 over Its Senior Synonyms Borlasiidae Diesing, 1862 and Nemertidae Ehrenberg, 1831 (Nemertea: Heteronemertea)","authors":"H. Kajihara","doi":"10.12782/specdiv.27.25","DOIUrl":"https://doi.org/10.12782/specdiv.27.25","url":null,"abstract":"The three heteronemertean nominal species Ascaris longissima Gunnerus, 1770, Borlasia angliae Oken, 1815, and Nemertes borlasii Cuvier, 1816 have been considered as synonymous, denoting the same species to which the valid name Lineus longissimus (Gunnerus, 1770) has been applied. These three nominal species are the type species of the genus-group names Lineus Sowerby, 1806, Borlasia Oken, 1815, and Nemertes Cuver, 1816, respectively, which are in turn the type genera of the family-group names Lineidae McIntosh, 1874, Borlasiidae Diesing, 1862, and Nemertidae Ehrenberg, 1831. Therefore, Lineus Sowerby, 1806 (currently in use) is a senior subjective synonym of Borlasia Oken, 1815 and Nemertes Cuvier, 1816 (both currently not in use), while Lineidae McIntosh, 1874 (currently in use) is a junior subjective synonym of Borlasiidae Diesing, 1862 and Nemertidae Ehrenberg, 1831 (both currently not in use); in addition, Micruridae Ehrenberg, 1831 (not in use) is also a senior synonym of Lineidae McIntosh, 1874. Borlasiidae Diesing, 1862 and Nemertidae Ehrenberg, 1831 have not been used as valid after 1899, while Lineidae McIntosh, 1874 has been used in at least 216 works published by 437 authors since 1971 until 2021, thus satisfying the conditions stipulated in Article 23.9.1 of the International Code of Zoological Nomenclature. Borlasiidae Diesing, 1862 and Nemertidae Ehrenberg, 1831 are herein declared nomina oblita with respect to Lineidae McIntosh, 1874, the latter being regarded as a nomen protectum under Article 23.9.2 of the International Code of Zoological Nomenclature. However, reversed precedence of Lineidae McIntosh, 1874 over its senior synonym Micruridae Ehrenberg, 1831 requires a ruling by the International Commission on Zoological Nomenclature, as the latter name was used as valid between 1998 and 2009","PeriodicalId":37692,"journal":{"name":"Species Diversity","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41626566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Taiga Kunishima, K. Maeda, Ryutei Inui, Yusuke Hibino
A single specimen of Muraenichthys gymnopterus (Bleeker, 1853) was collected from a sandy intertidal flat having rocks and dead corals in the estuarine area of Nagura Amparu, Ishigaki-jima Island, southern Japan, in October 2020. This specimen collection constitutes the first record of M. gymnopterus from Japanese waters. In this study, the diagnostic characters between M. gymnopterus and M. hattae Jordan and Snyder, 1901 are provided, based on our morphological observations of 37 specimens, including Okinawan specimen, and previous studies, as follows: head length [ M. gymnopterus 11.8– 15.0% of total length (TL) vs. M. hattae 9.4–11.0%], trunk length (24–25.4% of TL vs. 28–31%), the horizontal distance from the dorsal-fin origin to a vertical line through the anus 73–87% of head length vs. 13–49%), the number of vertebrae (total 129–130 vs. 148–155; predorsal 30 vs. 47–53; preanal 41–44 vs. 51–55), the number of the lateral-line pores before the anus (43–45 vs. 51–55). Additionally, the body depth at the gill opening in TL and the trunk length in TL can also be used to distinguish between these two species (2.8–3.7% of TL vs. 1.4–3.0%). Although M. gymnopterus has previously been reported from tropical to temperate regions, we suspect that the records from temperate regions are based on misidentification of M. hattae .
2020年10月，在日本南部石垣岛Nagura Amparu河口地区的一个有岩石和死珊瑚的砂质潮间带滩涂上收集了一具裸鱼(Bleeker, 1853年)标本。本标本是日本海域首次记录的裸子m.s ynnopterus。本文根据笔者对包括冲绳标本在内的37个标本的形态学观察，结合前人的研究，提出了裸鼠m.s nnopterus与m.h hattae Jordan and Snyder, 1901年的诊断特征如下:体长[裸龙11.8 - 15.0%占体长(TL)，海龙9.4-11.0%]，躯干长度(TL 24-25.4%比28-31%)，背鳍原点到肛门垂直线的水平距离占体长73-87%比13-49%)，椎骨数(129-130比148-155;Predorsal 30 vs. 47-53;肛门前41-44比51-55)，肛门前侧线毛孔的数量(43-45比51-55)。另外，用鳃口处的体表深度和躯干长度也可以区分这两个物种(分别为2.8-3.7%和1.4-3.0%)。虽然裸鼠在热带和温带地区都有报道，但我们怀疑温带地区的记录是基于对裸鼠的误认。
{"title":"First Japanese Record of Muraenichthys gymnopterus (Anguilliformes, Ophichthidae) from Ishigaki-jima Island, Ryukyu Archipelago","authors":"Taiga Kunishima, K. Maeda, Ryutei Inui, Yusuke Hibino","doi":"10.12782/specdiv.26.343","DOIUrl":"https://doi.org/10.12782/specdiv.26.343","url":null,"abstract":"A single specimen of Muraenichthys gymnopterus (Bleeker, 1853) was collected from a sandy intertidal flat having rocks and dead corals in the estuarine area of Nagura Amparu, Ishigaki-jima Island, southern Japan, in October 2020. This specimen collection constitutes the first record of M. gymnopterus from Japanese waters. In this study, the diagnostic characters between M. gymnopterus and M. hattae Jordan and Snyder, 1901 are provided, based on our morphological observations of 37 specimens, including Okinawan specimen, and previous studies, as follows: head length [ M. gymnopterus 11.8– 15.0% of total length (TL) vs. M. hattae 9.4–11.0%], trunk length (24–25.4% of TL vs. 28–31%), the horizontal distance from the dorsal-fin origin to a vertical line through the anus 73–87% of head length vs. 13–49%), the number of vertebrae (total 129–130 vs. 148–155; predorsal 30 vs. 47–53; preanal 41–44 vs. 51–55), the number of the lateral-line pores before the anus (43–45 vs. 51–55). Additionally, the body depth at the gill opening in TL and the trunk length in TL can also be used to distinguish between these two species (2.8–3.7% of TL vs. 1.4–3.0%). Although M. gymnopterus has previously been reported from tropical to temperate regions, we suspect that the records from temperate regions are based on misidentification of M. hattae .","PeriodicalId":37692,"journal":{"name":"Species Diversity","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44167136","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
An ovigerous female of a fish ectoparasite Argulus caecus C. B. Wilson, 1922 was collected from a squid, probably Todarodes pacificus (Steenstrup, 1880), from a fixed net installed in Otsuchi Bay, an inlet of the northwestern Pacific Ocean, Iwate Prefecture, northen Japan. Since the original description of A. caecus was insufficient, this paper reports on the morphology of the species based on a detailed examination of the female. In particular, the first and second antennae, the first and second maxillae, and four pairs of legs, whose features were poorly known, are reported in detail. The specimen of A. caecus is inferred to have detached itself and moved from a fish host, perhaps a coastal puffer, to the squid while these two animals were trapped in the net or when they were removed from the net. Following Argulus scutiformis Thiele, 1900, A. caecus is the second species of Argulus found from northern Japan located in the northern temperate or subarctic region, and its occurrence in this region is likely to be affected by the Tsushima Warm Current and its branch, the Tsugaru Warm Current, both of which flow off the coast of the region.
{"title":"Marine Fish Parasite Argulus caecus (Crustacea: Branchiura: Argulidae) Accidentally Collected from a Fixed Net Caught Squid in Northern Japan","authors":"K. Nagasawa, M. Hirose","doi":"10.12782/specdiv.26.289","DOIUrl":"https://doi.org/10.12782/specdiv.26.289","url":null,"abstract":"An ovigerous female of a fish ectoparasite Argulus caecus C. B. Wilson, 1922 was collected from a squid, probably Todarodes pacificus (Steenstrup, 1880), from a fixed net installed in Otsuchi Bay, an inlet of the northwestern Pacific Ocean, Iwate Prefecture, northen Japan. Since the original description of A. caecus was insufficient, this paper reports on the morphology of the species based on a detailed examination of the female. In particular, the first and second antennae, the first and second maxillae, and four pairs of legs, whose features were poorly known, are reported in detail. The specimen of A. caecus is inferred to have detached itself and moved from a fish host, perhaps a coastal puffer, to the squid while these two animals were trapped in the net or when they were removed from the net. Following Argulus scutiformis Thiele, 1900, A. caecus is the second species of Argulus found from northern Japan located in the northern temperate or subarctic region, and its occurrence in this region is likely to be affected by the Tsushima Warm Current and its branch, the Tsugaru Warm Current, both of which flow off the coast of the region.","PeriodicalId":37692,"journal":{"name":"Species Diversity","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44772642","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Investigations were carried out on 22 deep-water octocoral specimens in the family Coralliidae sampled from the Emperor Seamounts during 2009 to 2012. The specimens were collected from 350–1100 m deep, mostly from the southernmost region of the Emperor Seamounts. Colonies were identified by visual and microscopic observation of standard morphological characters (colony size, diameters of colony base and branches, diameter and height of autozooid mound, thickness of coenenchyme and sclerite sizes, etc.) along with supporting information from molecular DNA analysis. Half of the 22 specimens were identified as Pleurocorallium cf. pusillum (Kishinouye, 1903), suggesting that the species called “Mid” that was once harvested dominantly in this area was this species. The remaining 11 specimens were identified as genus Hemicorallium Gray, 1867. These were identified as belonging to the following species: one previously described species [H. laauense (Bayer, 1956)], three similar species [H. cf. abyssale (Bayer, 1956), H. cf. regale (Bayer, 1956), H. cf. sulcatum (Kishinouye, 1903)] and three new species (H. kaiyo sp. nov., H. muzikae sp. nov. and H. tokiyasui sp. nov.).
{"title":"A Report on Coralliidae (Cnidaria: Octocorallia) Specimens Collected from the Emperor Seamounts with Descriptions of Three New Species","authors":"M. Nonaka, T. Hayashibara","doi":"10.12782/specdiv.26.297","DOIUrl":"https://doi.org/10.12782/specdiv.26.297","url":null,"abstract":"Investigations were carried out on 22 deep-water octocoral specimens in the family Coralliidae sampled from the Emperor Seamounts during 2009 to 2012. The specimens were collected from 350–1100 m deep, mostly from the southernmost region of the Emperor Seamounts. Colonies were identified by visual and microscopic observation of standard morphological characters (colony size, diameters of colony base and branches, diameter and height of autozooid mound, thickness of coenenchyme and sclerite sizes, etc.) along with supporting information from molecular DNA analysis. Half of the 22 specimens were identified as Pleurocorallium cf. pusillum (Kishinouye, 1903), suggesting that the species called “Mid” that was once harvested dominantly in this area was this species. The remaining 11 specimens were identified as genus Hemicorallium Gray, 1867. These were identified as belonging to the following species: one previously described species [H. laauense (Bayer, 1956)], three similar species [H. cf. abyssale (Bayer, 1956), H. cf. regale (Bayer, 1956), H. cf. sulcatum (Kishinouye, 1903)] and three new species (H. kaiyo sp. nov., H. muzikae sp. nov. and H. tokiyasui sp. nov.).","PeriodicalId":37692,"journal":{"name":"Species Diversity","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42009751","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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