Kentaro Mochizuki, Y. Kai, Hiromitsu Endo, H. Motomura
Ocosia spinosa Chen, 1981 (Tetrarogidae) is newly recorded from the Pacific coast of Japan, on the basis of 10 specimens (31.3–78.1 mm standard length), having been previously reported only from Taiwan. A revised diagnosis for the species, based on the Japanese specimens plus a single specimen from Taiwan, is given as follows: XV–XVIII, 7 or 8 dorsal-fin rays; III, 4–6 anal-fin rays; usually 13 (rarely 12) pectoral-fin rays; 12–18 lateral-line pores on body; 6–15 gill rakers; usually 28 (rarely 27) vertebrae; 2nd dorsal-fin spine longest, slightly longer than 3rd spine; interspinous dorsal-fin membranes of middle portion of dorsal fin incised for one-fourth to one-third of each spine length; dorsal profile of snout concave; posterior lacrimal spine directed backward, its length about 2–3 times greater than that of anterior lacrimal spine; small lateral lacrimal spine usually present (absent in larger specimens); small spine usually present at anterior end of suborbital ridge in smaller specimens (absent in larger specimens); weak stubby papillae covering upper lip and anterior half to one-third of lower lip; trunk uniformly brownish-red when fresh, without distinct markings (but with faint brownish small blotch near base of middle portion of dorsal fin in some individuals). Although the presence or absence of small spines on the lateral surface of the lacrimal and anterior end of the suborbital ridge has previously been regarded as an important diagnostic character of O. spinosa , examination of the present specimens showed that the character changes with growth. The present specimens represent the first Japanese records, as well as the northernmost and easternmost records for the species. The new English and Japanese standard names “Red Waspfish” and “Aka-hachiokoze”, respectively, are proposed for O. spinosa .
{"title":"Revised Diagnosis and First Japanese Records of the Waspfish Ocosia spinosa (Teleostei: Tetrarogidae)","authors":"Kentaro Mochizuki, Y. Kai, Hiromitsu Endo, H. Motomura","doi":"10.12782/specdiv.26.281","DOIUrl":"https://doi.org/10.12782/specdiv.26.281","url":null,"abstract":"Ocosia spinosa Chen, 1981 (Tetrarogidae) is newly recorded from the Pacific coast of Japan, on the basis of 10 specimens (31.3–78.1 mm standard length), having been previously reported only from Taiwan. A revised diagnosis for the species, based on the Japanese specimens plus a single specimen from Taiwan, is given as follows: XV–XVIII, 7 or 8 dorsal-fin rays; III, 4–6 anal-fin rays; usually 13 (rarely 12) pectoral-fin rays; 12–18 lateral-line pores on body; 6–15 gill rakers; usually 28 (rarely 27) vertebrae; 2nd dorsal-fin spine longest, slightly longer than 3rd spine; interspinous dorsal-fin membranes of middle portion of dorsal fin incised for one-fourth to one-third of each spine length; dorsal profile of snout concave; posterior lacrimal spine directed backward, its length about 2–3 times greater than that of anterior lacrimal spine; small lateral lacrimal spine usually present (absent in larger specimens); small spine usually present at anterior end of suborbital ridge in smaller specimens (absent in larger specimens); weak stubby papillae covering upper lip and anterior half to one-third of lower lip; trunk uniformly brownish-red when fresh, without distinct markings (but with faint brownish small blotch near base of middle portion of dorsal fin in some individuals). Although the presence or absence of small spines on the lateral surface of the lacrimal and anterior end of the suborbital ridge has previously been regarded as an important diagnostic character of O. spinosa , examination of the present specimens showed that the character changes with growth. The present specimens represent the first Japanese records, as well as the northernmost and easternmost records for the species. The new English and Japanese standard names “Red Waspfish” and “Aka-hachiokoze”, respectively, are proposed for O. spinosa .","PeriodicalId":37692,"journal":{"name":"Species Diversity","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42204577","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 feather mite Pseudalloptinus milvulinus (Trouessart, 1884) was collected from feathers of the Black Kite Milvus migrans (Boddaert, 1783) in Ishikawa Prefecture, Japan, in 2019. The identification of this mite was based on the form and arrangement of setae on the idiosoma and aggenital region. This study is the first report of this mite species and the genus Pseudalloptinus Dubinin, 1956 in Japan.
{"title":"The First Report of the Feather Mite Pseudalloptinus milvulinus (Acariformes: Pterolichidae) from the Black Kite Milvus migrans in Japan","authors":"Tsukasa Waki, M. Sasaki, H. Matsubara, S. Shimano","doi":"10.12782/specdiv.26.273","DOIUrl":"https://doi.org/10.12782/specdiv.26.273","url":null,"abstract":"The feather mite Pseudalloptinus milvulinus (Trouessart, 1884) was collected from feathers of the Black Kite Milvus migrans (Boddaert, 1783) in Ishikawa Prefecture, Japan, in 2019. The identification of this mite was based on the form and arrangement of setae on the idiosoma and aggenital region. This study is the first report of this mite species and the genus Pseudalloptinus Dubinin, 1956 in Japan.","PeriodicalId":37692,"journal":{"name":"Species Diversity","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48528131","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}
Adult male and larva of Gnathia capitellum sp. nov. (Crustacea: Isopoda: Gnathiidae) are described. The specimens were laboratory-reared larvae that infested host fishes collected by longline fishing in a coastal bay of Izu Peninsula and adult males found in dredge samples from shallow water (depth: 11–12 m) of Miura Peninsula, central Japan. Adult males of G. capitellum sp. nov. were easily distinguished from the other species of Gnathia Leach, 1814 from around the world by the small oval head and the inner margin of pylopod without plumose setae. Most other Gnathia species have a large rectangular head and plumose setae present on the article 1 of pylopod. Appearance of the adult male resembles the genus Afrignathia Hadfield and Smit, 2008 rather than Gnathia but Afrignathia has maxilla 1 which is absent in all known male gnathiids in the world including G. capitellum sp. nov. Fish parasitic larva of G. capitellum sp. nov. is also described herein. This larva closely resembles larvae of the genus Gnathia , but can be distinguished from the other Gnathia species by the remarkably oval-shaped basis in pereopods 2–4.
{"title":"Description of a Small-headed Gnathiid Isopod (Crustacea), Gnathia capitellum sp. nov., from Coastal Japan","authors":"Y. Ota, Hisanori Kohtsuka, Katsuhiko Tanaka","doi":"10.12782/specdiv.26.207","DOIUrl":"https://doi.org/10.12782/specdiv.26.207","url":null,"abstract":"Adult male and larva of Gnathia capitellum sp. nov. (Crustacea: Isopoda: Gnathiidae) are described. The specimens were laboratory-reared larvae that infested host fishes collected by longline fishing in a coastal bay of Izu Peninsula and adult males found in dredge samples from shallow water (depth: 11–12 m) of Miura Peninsula, central Japan. Adult males of G. capitellum sp. nov. were easily distinguished from the other species of Gnathia Leach, 1814 from around the world by the small oval head and the inner margin of pylopod without plumose setae. Most other Gnathia species have a large rectangular head and plumose setae present on the article 1 of pylopod. Appearance of the adult male resembles the genus Afrignathia Hadfield and Smit, 2008 rather than Gnathia but Afrignathia has maxilla 1 which is absent in all known male gnathiids in the world including G. capitellum sp. nov. Fish parasitic larva of G. capitellum sp. nov. is also described herein. This larva closely resembles larvae of the genus Gnathia , but can be distinguished from the other Gnathia species by the remarkably oval-shaped basis in pereopods 2–4.","PeriodicalId":37692,"journal":{"name":"Species Diversity","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43401878","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 cestode fauna of murid and cricetid rodents in Hokkaido, the northernmost island of Japan, was evaluated based on our parasite collection and a review of the literature. Adult and larval cestodes collected from Apodemus speciosus (Temminck, 1844), Myodes rufocanus (Sundevall, 1846), and Rattus norvegicus (Berkenhout, 1769) in Hokkaido were identified by both morphological and molecular diagnoses. A total of 10 species from 5 families were confirmed in our collection. Arostrilepis tenuicirrosa Makarikov, Gulyaev, and Kontrimavichus, 2011, Paranoplocephala kalelai (Tenora, Haukisalmi, and Henttonen, 1985), and Taenia crassiceps (Zeder, 1800) were recorded for the first time from Hokkaido. A comprehensive look at both the present and previous studies revealed that the cestode fauna of rodents in Japan consists of at least 30 species from 6 families. Among them, 23 species occur in Hokkaido. The species composition is strongly affected by the nearby Eurasian continent, suggesting parasite migrations with rodent hosts over land bridges between Hokkaido and Sakhalin and between Hokkaido and Honshu, the main island of Japan. A DNA barcoding system using sequences of nuclear 28S rDNA and mitochondrial cox1 allowed us to identify cestodes at species and genus levels, even in different developmental stages. The integration of morphological and molecular diagnoses is essential in cestode taxonomy to establish a common ground for biogeographical studies worldwide. The standardization of DNA barcoding is particularly of critical importance.
{"title":"Cestode fauna of murid and cricetid rodents in Hokkaido, Japan, with assignment of DNA barcodes","authors":"M. Sasaki, Jason L. Anders, M. Nakao","doi":"10.12782/specdiv.26.255","DOIUrl":"https://doi.org/10.12782/specdiv.26.255","url":null,"abstract":"The cestode fauna of murid and cricetid rodents in Hokkaido, the northernmost island of Japan, was evaluated based on our parasite collection and a review of the literature. Adult and larval cestodes collected from Apodemus speciosus (Temminck, 1844), Myodes rufocanus (Sundevall, 1846), and Rattus norvegicus (Berkenhout, 1769) in Hokkaido were identified by both morphological and molecular diagnoses. A total of 10 species from 5 families were confirmed in our collection. Arostrilepis tenuicirrosa Makarikov, Gulyaev, and Kontrimavichus, 2011, Paranoplocephala kalelai (Tenora, Haukisalmi, and Henttonen, 1985), and Taenia crassiceps (Zeder, 1800) were recorded for the first time from Hokkaido. A comprehensive look at both the present and previous studies revealed that the cestode fauna of rodents in Japan consists of at least 30 species from 6 families. Among them, 23 species occur in Hokkaido. The species composition is strongly affected by the nearby Eurasian continent, suggesting parasite migrations with rodent hosts over land bridges between Hokkaido and Sakhalin and between Hokkaido and Honshu, the main island of Japan. A DNA barcoding system using sequences of nuclear 28S rDNA and mitochondrial cox1 allowed us to identify cestodes at species and genus levels, even in different developmental stages. The integration of morphological and molecular diagnoses is essential in cestode taxonomy to establish a common ground for biogeographical studies worldwide. The standardization of DNA barcoding is particularly of critical importance.","PeriodicalId":37692,"journal":{"name":"Species Diversity","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46990287","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}
Members of the family Haloclavidae, belonging to the order Actiniaria, are characterized by the presence of a large siphonoglyph next to their actinopharynx and an aboral end without a basal disc. Members of the genus Haloclava Verrill, 1899 have been reported primarily from Europe and America, and have not yet been described from Japanese waters based on the collected specimen. In this study, I describe a new species, Haloclava hercules sp. nov., from the Pacific coast of Japan. This new species is chiefly characterized by cudgel-like blunt massive tentacles with knob-like acrospheres in the outer tentacular cycle and gigantic basitrichs over 250 μm in length, which are the largest known from sea anemones.
{"title":"The Largest Cnidae Among the Sea Anemones; Description of a New Haloclavid Species from Japan, Haloclava hercules (Cnidaria: Actiniaria: Enthemonae: Haloclavidae)","authors":"Takato Izumi","doi":"10.12782/specdiv.26.241","DOIUrl":"https://doi.org/10.12782/specdiv.26.241","url":null,"abstract":"Members of the family Haloclavidae, belonging to the order Actiniaria, are characterized by the presence of a large siphonoglyph next to their actinopharynx and an aboral end without a basal disc. Members of the genus Haloclava Verrill, 1899 have been reported primarily from Europe and America, and have not yet been described from Japanese waters based on the collected specimen. In this study, I describe a new species, Haloclava hercules sp. nov., from the Pacific coast of Japan. This new species is chiefly characterized by cudgel-like blunt massive tentacles with knob-like acrospheres in the outer tentacular cycle and gigantic basitrichs over 250 μm in length, which are the largest known from sea anemones.","PeriodicalId":37692,"journal":{"name":"Species Diversity","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49164722","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}
This study describes a new species of the subfamily Coelotinae (Agelenidae) from Kinki district, central Japan, under the name of Coelotes nojimai sp. nov. It resembles C. yodoensis Nishikawa, 1977 and C. nagaraensis Nishikawa, 2009 but is characterized by a male palp with a large and greatly curved conductor and slender spermathecae in the internal genitalia of female specimens. The morphological differences and distribution ranges of these three species have been discussed in detail. In addition, the mitochondrial cytochrome c oxidase subunit I (mt-COI) partial sequences of the new species have been analyzed and documented for future use.
{"title":"A New Species of the Subfamily Coelotinae (Araneae: Agelenidae) from Shiga and Fukui Prefectures, Japan","authors":"K. Okumura, Zhe Zhao","doi":"10.12782/specdiv.26.235","DOIUrl":"https://doi.org/10.12782/specdiv.26.235","url":null,"abstract":"This study describes a new species of the subfamily Coelotinae (Agelenidae) from Kinki district, central Japan, under the name of Coelotes nojimai sp. nov. It resembles C. yodoensis Nishikawa, 1977 and C. nagaraensis Nishikawa, 2009 but is characterized by a male palp with a large and greatly curved conductor and slender spermathecae in the internal genitalia of female specimens. The morphological differences and distribution ranges of these three species have been discussed in detail. In addition, the mitochondrial cytochrome c oxidase subunit I (mt-COI) partial sequences of the new species have been analyzed and documented for future use.","PeriodicalId":37692,"journal":{"name":"Species Diversity","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47649779","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}
Sodium hypochlorite has been used for cleaning specimens of freshwater and brackish water snails that are covered with deposits. Our experiments using specimens of two freshwater snail species, Semisulcospira niponica (Smith, 1876) and S. reticulata Kajiyama and Habe, 1961, showed that this traditional method could remove thin deposit layers, including algae, but was not useful for obstinate deposits. We found that a new method using ammonium thioglycolate could be applied to remove obstinate iron-rich deposits. Though ammonium thioglycolate treatment caused loss of gloss inside the aperture, this loss could be prevented by plugging a kneaded eraser into an aperture. Moreover, the new method could clean specimens with little damage of the periostracum. So as to remove deposits with the least damage to shells, 3% w/v sodium hypochlorite was useful for deposits including algae, and 20% w/v ammonium thioglycolate was suitable for cleaning specimens with iron-rich deposits. Degeneration of the microstructure of inner whorls can be avoided by plugged shell apertures with a kneaded eraser in both methods. Shell deposits that are composed of both algae and iron should be treated first with 20% w/v ammonium thioglycolate, and then with 3% w/v sodium hypochlorite to remove the deposits. Appropriate cleaning methods enable accurate examination and long-term preservation of shell specimens.
{"title":"A New Cleaning Method for Accurate Examination of Freshwater Gastropod Shell Specimens Covered with Iron-rich Deposits","authors":"Naoto Sawada, H. Toyohara, T. Nakano","doi":"10.12782/specdiv.26.217","DOIUrl":"https://doi.org/10.12782/specdiv.26.217","url":null,"abstract":"Sodium hypochlorite has been used for cleaning specimens of freshwater and brackish water snails that are covered with deposits. Our experiments using specimens of two freshwater snail species, Semisulcospira niponica (Smith, 1876) and S. reticulata Kajiyama and Habe, 1961, showed that this traditional method could remove thin deposit layers, including algae, but was not useful for obstinate deposits. We found that a new method using ammonium thioglycolate could be applied to remove obstinate iron-rich deposits. Though ammonium thioglycolate treatment caused loss of gloss inside the aperture, this loss could be prevented by plugging a kneaded eraser into an aperture. Moreover, the new method could clean specimens with little damage of the periostracum. So as to remove deposits with the least damage to shells, 3% w/v sodium hypochlorite was useful for deposits including algae, and 20% w/v ammonium thioglycolate was suitable for cleaning specimens with iron-rich deposits. Degeneration of the microstructure of inner whorls can be avoided by plugged shell apertures with a kneaded eraser in both methods. Shell deposits that are composed of both algae and iron should be treated first with 20% w/v ammonium thioglycolate, and then with 3% w/v sodium hypochlorite to remove the deposits. Appropriate cleaning methods enable accurate examination and long-term preservation of shell specimens.","PeriodicalId":37692,"journal":{"name":"Species Diversity","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43094965","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 spelling of the specific name monticolus in the scientific name of a spider, Cybaeus monticolus Kobayashi, 2006, does not violate any relevant provisions of the International Code of Zoological Nomenclature. This spelling is, therefore, the “correct original spelling” of the specific name under Article 32.2 of the Code. Regardless of whether this name is deemed an adjective or a noun in apposition, it should be maintained unaltered when it is combined with the generic name Cybaeus L. Koch, 1868, the gender of which is masculine. The later spelling monticola , as presented in the combination Cybaeus monticola in a recent arachnological treatise and then in an important online taxonomic resource from which its use appears to be spreading, is an “incorrect subsequent spelling” under Article 33.3 of the Code.
蜘蛛学名Cybaeus monticolus Kobayashi, 2006中的具体名称monticolus的拼写不违反《国际动物命名法》的任何相关规定。因此，这种拼写是法典第32.2条规定的特定名称的“正确的原始拼写”。无论这个名字是形容词还是名词，当它与属名Cybaeus L. Koch, 1868(性别为男性)结合在一起时，都应该保持不变。后来的拼写monticola，在最近的一篇蜘蛛学论文中出现在Cybaeus monticola的组合中，然后在一个重要的在线分类资源中出现，其使用似乎正在传播，根据法典第33.3条，这是一个“不正确的后续拼写”。
{"title":"The Original Spelling of the Specific Name of Cybaeus monticolus (Araneae: Cybaeidae) Should be Reinstated","authors":"T. Nakano","doi":"10.12782/specdiv.26.205","DOIUrl":"https://doi.org/10.12782/specdiv.26.205","url":null,"abstract":"The spelling of the specific name monticolus in the scientific name of a spider, Cybaeus monticolus Kobayashi, 2006, does not violate any relevant provisions of the International Code of Zoological Nomenclature. This spelling is, therefore, the “correct original spelling” of the specific name under Article 32.2 of the Code. Regardless of whether this name is deemed an adjective or a noun in apposition, it should be maintained unaltered when it is combined with the generic name Cybaeus L. Koch, 1868, the gender of which is masculine. The later spelling monticola , as presented in the combination Cybaeus monticola in a recent arachnological treatise and then in an important online taxonomic resource from which its use appears to be spreading, is an “incorrect subsequent spelling” under Article 33.3 of the Code.","PeriodicalId":37692,"journal":{"name":"Species Diversity","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44480125","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}
Caprella nojimaensis sp. nov. (Crustacea: Amphipoda: Caprellidae), inhabiting the gorgonian Calcigorgia gracilis Matsumoto, van Ofwegen, and Bayer, 2019, is described based on a specimen from 1497 m depth in the Nojima Submarine Canyon, off Boso Peninsula, central Japan. The species is closely related to C. gracillima Mayer, 1890, but differs from the latter in gnathopod 2 being positioned near the anterior margin of pereonite 2 and in the presence of paired small mid-dorsal projections on pereonites 2 and 5. The body colour of live material is pale pink, with mouth parts and gnathopod 2 fringed with darker pink, revealing protective colouration that matches that of the host gorgonian. The clinging behaviour in situ is “upright” as recorded by the remotely operated vehicle Hyper-Dolphin, and the presence of dense swimming setae on antenna 2 suggests that the caprellid feeds by filtering material suspended in
{"title":"A New Species of the Genus Caprella (Crustacea: Amphipoda: Caprellidae) Collected from a Gorgonian at 1497 m Depth off Boso Peninsula, Central Japan","authors":"I. Takeuchi, Momo Shiraishi, R. Mimori","doi":"10.12782/specdiv.26.225","DOIUrl":"https://doi.org/10.12782/specdiv.26.225","url":null,"abstract":"Caprella nojimaensis sp. nov. (Crustacea: Amphipoda: Caprellidae), inhabiting the gorgonian Calcigorgia gracilis Matsumoto, van Ofwegen, and Bayer, 2019, is described based on a specimen from 1497 m depth in the Nojima Submarine Canyon, off Boso Peninsula, central Japan. The species is closely related to C. gracillima Mayer, 1890, but differs from the latter in gnathopod 2 being positioned near the anterior margin of pereonite 2 and in the presence of paired small mid-dorsal projections on pereonites 2 and 5. The body colour of live material is pale pink, with mouth parts and gnathopod 2 fringed with darker pink, revealing protective colouration that matches that of the host gorgonian. The clinging behaviour in situ is “upright” as recorded by the remotely operated vehicle Hyper-Dolphin, and the presence of dense swimming setae on antenna 2 suggests that the caprellid feeds by filtering material suspended in","PeriodicalId":37692,"journal":{"name":"Species Diversity","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49170689","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}
Eighteen specimens of Sardinella gibbosa (Bleeker, 1849) collected from Okinawa Island, Ryukyu Islands, Japan represent the first Japanese specimen-based records of the species. All specimens conformed closely to the diagnosis of S. gibbosa, having the caudal fin uniformly pale, a black spot on the dorsal-fin origin, body scales with centrally discontinuous striae, 26−31+50–57=77–88 gill rakers on the first gill arch, and 18 or 19+14 or 15=32–34 keeled scutes along the body ventral surface. In addition, some previous Japanese records of unidentified clupeoid fishes are reviewed.
{"title":"First Japanese Specimen-based Records of Sardinella gibbosa (Teleostei: Clupeiformes: Clupeidae) from Okinawa Island","authors":"H. Hata, H. Motomura","doi":"10.12782/specdiv.26.197","DOIUrl":"https://doi.org/10.12782/specdiv.26.197","url":null,"abstract":"Eighteen specimens of Sardinella gibbosa (Bleeker, 1849) collected from Okinawa Island, Ryukyu Islands, Japan represent the first Japanese specimen-based records of the species. All specimens conformed closely to the diagnosis of S. gibbosa, having the caudal fin uniformly pale, a black spot on the dorsal-fin origin, body scales with centrally discontinuous striae, 26−31+50–57=77–88 gill rakers on the first gill arch, and 18 or 19+14 or 15=32–34 keeled scutes along the body ventral surface. In addition, some previous Japanese records of unidentified clupeoid fishes are reviewed.","PeriodicalId":37692,"journal":{"name":"Species Diversity","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44062943","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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