Bulletin of the Kanagawa Prefectural Museum (Natural Science)
Online ISSN : 2189-6720
Print ISSN : 0453-1906
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Earth Science
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Biology (Zoology)
Original Article
  • Takuji YATO, Akinori TERAMURA, Akira ETO, Hiroshi SENOU
    2021 Volume 2021 Issue 50 Pages 31-37
    Published: 2021
    Released: March 30, 2021
    RESEARCH REPORT / TECHNICAL REPORT FREE ACCESS
    Two specimens of Pterygotrigla cajorarori Richards and Yato, 2012 (Perciformes: Scorpaenoidei: Triglidae) were collected from the Pacific coast, off Shizuoka Prefecture, one from Suruga Bay, and the other from Enshu Nada, Japan. The specimen from Enshu Nada is small (152.8 mm in standard length), lacking hyper-ossification on the rostral projection, and having characteristic coloration of small yellow ocelli scattered on the dorsal surface of the body and a small black blotch on the membrane between the second to third and the third to fourth rays of the second dorsal-fin. Until recently, this species had been collected in Japan only from Kochi Prefecture but, in the recent two years, it has been collected from Shizuoka Prefecture. We consider that this species has extended its distribution northward as a result of the increase in marine temperature. The specimen from Suruga Bay represents the northernmost distribution of this species.
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  • Shota TANAKA, Hironari SAITO, Hiroshi SENOU
    2021 Volume 2021 Issue 50 Pages 39-45
    Published: 2021
    Released: March 30, 2021
    RESEARCH REPORT / TECHNICAL REPORT FREE ACCESS
    Three specimens of Neomyxus leuciscus (Mugilidae) were collected from the waters around Chichi-jima Island, the Ogasawara Islands. One specimen (38.35 mm SL) provided new knowledge concerning the species’ initial morphological features and changes that occur from juvenile to adult: snout becomes relatively longer and teeth increase in number and size with growth. It is considered that these changes reflect the food habits as the species adapts to being a herbivore. Additionally, one specimen (135.25 mm SL) examined in this study suggests that mature individuals may exist in the waters around Chichi-jima Island. These specimens are biogeographically important in indicating that this species is reproducing albeit to a small degree in the waters around Chichi-jima Island.
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  • Kiyotaka HATOOKA, Hiroshi SENOU, Korechika YANO, Toshiyuki SUZUKI
    2021 Volume 2021 Issue 50 Pages 47-53
    Published: 2021
    Released: March 30, 2021
    RESEARCH REPORT / TECHNICAL REPORT FREE ACCESS
    A single specimen of the moray eel identified as Gymnothorax polyuranodon (Bleeker, 1853) recently collected from the freshwater area of a river in Iriomote Island, Yaeyama Islands, is the first record of the species from Japan. The specimen was characterized as follows: total vertebrae 147 (predorsal 10, preanal 72); body with irregular black specks; vertical fins low; jaw teeth in two or three irregular rows; anus posterior to mid-body; preanal length 54.2 % of total length, head length 9.3 %, trunk 44 %; body depth 4.1 at gill opening, 4.9 at mid-anus; predorsal length 83.1 % of head length, upper-jaw length 25.8 %, lower-jaw length 22.7 %, snout length 10.7 %, eye diameter 4.9 %, interorbital width 9.1 %; dorsal-fin height 29.7 % of body depth at anus. A new standard Japanese name “Kokuhan-kawautsubo” is proposed for the species. This seemingly rare occurrence of the species is considered to be natural dispersal; while an established population is unlikely, it is necessary to monitor its occurrence from a conservation perspective, with reference to previous cases of fishes inhabiting similar environments.
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  • Kyohei WATANABE
    2021 Volume 2021 Issue 50 Pages 55-136
    Published: 2021
    Released: March 30, 2021
    RESEARCH REPORT / TECHNICAL REPORT FREE ACCESS
    Phygadeuontinae (Hymenoptera, Ichneumonidae) is one of the poorly studied subfamilies in Japan. In this study, I study 28 genera and 61 species of Japanese Phygadeuontinae taxonomically and zoogeographycally. Seven genera, Diaglyptidea Viereck, 1913, Micraris Townes, 1970, Surculus Townes, 1970, Bentyra Cameron, 1905, Isadelphus Förster, 1869, Megacara Townes, 1970, and Tropistes Gravenhorst, 1829, are newly recorded from Japan. Micraris and Surculus are also newly recorded from the Palearctic region. The following 17 new species are described: Acrolyta japonica sp. nov.; Micraris ryukyuensis sp. nov.; Surculus japonicus sp. nov.; Bentyra ryukyuana sp. nov.; Paraphylax elegans sp. nov.; Pa. politus sp. nov.; Pa. transstriatus sp. nov.; Pa. yakushimensis sp. nov.; Pa. yambarensis sp. nov.; Hemiteles japonicus sp. nov.; H. kuro sp. nov.; H. maculipterus sp. nov.; H. yamatonis sp. nov.; Isadelphus nigrus sp. nov.; Lochetica japonica sp. nov.; Tropistes shimizui sp. nov.; Uchidella toichii sp. nov. The following nine species are newly recorded from Japan: Acr. flavicoxis Sheng & Sun, 2014; Acr. rufocincta (Gravenhorst, 1829); Diaglyptidea conformis (Gmelin, 1790); Bathythrix margaretae Sawoniewicz, 1980; Ba. thomsoni (Kerrich, 1942); Dichrogaster nitida Sheng & Sun, 2014; Megacara similis Sheng, 1999; Orthizema semanotae Sheng & Sun, 2014; Mesoleptus laevigatus (Gravenhorst, 1829). Bathythrix narangae Uchida, 1930 is newly synonymized under Ba. kuwanae Viereck, 1912 (syn. nov.). Ethelurgus politus Townes, 1983 is newly synonymized under E. episyrphicola Kusigemati, 1983 (syn. nov.). Ethelurgus sodalis fuscipes Townes, 1983 is newly synonymized under E. kumatai Kusigemati, 1983 (syn. nov.). Furthermore, the taxonomic status of E. kumatai changed as a subspecies of E. sodalis (Taschenberg, 1865) (comb. nov.). Some new distribution records and a key to species of the 11 genera are also provided.
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  • Haruki KARUBE, Reiko KAGA
    2021 Volume 2021 Issue 50 Pages 137-141
    Published: 2021
    Released: March 30, 2021
    RESEARCH REPORT / TECHNICAL REPORT FREE ACCESS
    Libelloides ramburi (M’Lachlan, 1875) is a large insect of the order Neuroptera that inhabits good grasslands of Japan, and is a rapidly decreasing species in various places. It has been previously recorded from 12 points in Kanagawa Prefecture, but only a few records are known in recent years. Therefore, it has been regarded as an endangered species on the Kanagawa Prefecture Red List. Since confirming this species in 2017, the authors have intensively investigated distribution of this species in the prefecture. As a result, we we found the species at 20 localities, mainly in the former Fujino Town area of Midori Ward, Sagamihara City in the northern part of the prefecture. Even in a similar grassland environment, the species could not be found and its distribution was limited. The environment in which this species is distributed is grassland where artificially mowing has been continued. Such distribution environment is diverse, but its habitat stability is fragile. Although the number of localities has increased, it has become clear that the distribution is localized and threatened with extinction.
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