著者

Nobuhiro Saito Takeo Yamauchi

出版者

日本甲殻類学会

雑誌

Crustacean Research (ISSN:02873478)

巻号頁・発行日

vol.45, pp.59-67, 2016 (Released:2016-12-05)

参考文献数

14

被引用文献数

8

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Elthusa moritakii sp. nov., a branchial parasite of the deepwater bullhead sculpin Ereunias grallator, is described from Japan. The new species is morphologically similar to Elthusa propinqua (Richardson, 1904), but can be distinguished from the congener by a combination of characteristics of ovigerous females, including pereopods 5–7 with unexpanded carina, number of robust setae on maxilla, greatest width of pleon, shape of pleopods, and length of pleotelson. Further, new host records of E. propinqua are here reported. This species was recently collected from five macrourid fish species from Japan, including the grenadiers, Coelorinchus jordani, C. longissimus, the spearnose grenadier, C. multispinulosus, the unicorn grenadier, C. productus, and the Sagami grenadier, Ventrifossa garmani.

著者

Ming-Chih Huang Nobuhiro Saito Michitaka Shimomura

出版者

Carcinological Society of Japan

雑誌

Crustacean Research (ISSN:02873478)

巻号頁・発行日

vol.47, pp.43-53, 2018-06-30 (Released:2018-06-30)

参考文献数

16

被引用文献数

6

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Holophryxus fusiformis Shiino, 1937, a species of dajid isopod that attaches to the carapace of sakura shrimp, Lucensosergia lucens (Hansen, 1922), is reported from the sea of Taiwan for the first time. This species was first described as infesting Prehensilosergia prehensilis (Bate, 1881) from Kanbara, Shizuoka Prefecture, Japan. The current finding represents the second occurrence of H. fusiformis and identifies a new host. Approximately 1% of the sakura shrimps in Yilan, Taiwan are infected by H. fusiformis. Holophryxus fusiformis has been found offshore from both Yilan, Taiwan and Nagasaki and in Suruga Bay, Japan; thus, the distribution of the parasite possibly follows the Kuroshio Current. When large quantities of parasites occur in the sea of Taiwan, the parasites are likely to flow into the Japanese waters along with the Kuroshio Current, subsequently influencing the production of the Japanese sakura shrimps. The establishment of a monitoring program for infection of the dajid in sakura shrimps between Taiwan and Japan is recommended. This study provides additional information on this species, including a new host, distribution, redescription, infection rate, and morphological variation.

著者

Nobuhiro Saito

出版者

Carcinological Society of Japan

雑誌

Crustacean Research (ISSN:02873478)

巻号頁・発行日

vol.49, pp.99-107, 2020-06-18 (Released:2020-06-18)

参考文献数

20

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A hemiarthrine bopyrid, Quadripediphryxus mayuzumii gen. et sp. nov. (Isopoda: Epicaridea: Bopyridae), is described based on a pair of specimens infesting the ventral surface of the abdomen of a snapping shrimp, Synalpheus streptodactylus Coutière, 1905 (Decapoda: Caridea: Alpheidae). The shrimp was collected from ornamental coral rock of an unidentified species of Poritidae (Cnidaria: Anthozoa) from Ehime Prefecture, Japan. The female of the new genus is similar to those in the genera Hemiphryxus Bruce, 1978, Eriphrixus Markham, 1990, and Micropodiphryxus Boyko, 2012, in having seven and four pereopods on the concave and convex sides of the body, respectively. However, female of the new genus can be distinguished from those in the other genera by the presence of a tiny triangular pleotelson bearing uropods. This finding represents the 12th species of hemiarthrine bopyrids found infesting the abdomen of caridean shrimps recorded from Japan.

著者

Nobuhiro Saito Aiko Kayama Yasuhide Nakamura

出版者

Carcinological Society of Japan

雑誌

Crustacean Research (ISSN:02873478)

巻号頁・発行日

vol.51, pp.111-113, 2022-10-19 (Released:2022-10-19)

参考文献数

14

被引用文献数

1

著者

Nobuhiro Saito Hiroki Fujita

出版者

Carcinological Society of Japan

雑誌

Crustacean Research (ISSN:02873478)

巻号頁・発行日

vol.51, pp.47-54, 2022-07-02 (Released:2022-07-02)

参考文献数

25

被引用文献数

2

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Here, the aegathoid stage of Nerocila japonica Schioedte & Meinert, 1881 is described based on a specimen collected from the Seto Inland Sea, Japan, and its identity is confirmed by both morphology and molecular barcoding. Cytochrome c oxidase subunit I and 16S rRNA sequences of the collected individual shared ≥99% similarity with the previous DNA records of N. japonica. In terms of morphology, the aegathoid stage of the specimen examined in the present study differed from that of N. phaiopleura Bleeker, 1857 by intermediate size of the eyes and setation on pereopods. This is the first record of N. japonica infesting the red seabream Pagrus major (Temminck & Schlegel, 1843).

著者

Hiroki Fujita Tetsuya Umino Nobuhiro Saito

出版者

Carcinological Society of Japan

雑誌

Crustacean Research (ISSN:02873478)

巻号頁・発行日

vol.50, pp.29-31, 2021-04-02 (Released:2021-04-02)

参考文献数

13

被引用文献数

6

著者

Nobuhiro Saito Kaori Wakabayashi Takeya Moritaki

出版者

The Japanese Society of Systematic Zoology

雑誌

Species Diversity (ISSN:13421670)

巻号頁・発行日

vol.25, no.1, pp.75-87, 2020-02-15 (Released:2020-02-15)

参考文献数

46

被引用文献数

3

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Three new species of the ascothoracidan crustacean genus Dendrogaster Knipovich, 1890 (Dendrogasteridae) are described from goniasterid sea-stars in Japan. Dendrogaster komatsuae sp. nov. and D. tobasuii sp. nov. were found respectively in the coelomic cavities of Lithosoma japonica Hayashi, 1952 and two species of Mediaster: M. arcuatus (Sladen, 1889) and M. brachiatus Goto, 1914 from the Kumano-nada Sea. Dendrogaster nagasakimaruae sp. nov. was similarly found in Nymphaster euryplax Fisher, 1913 from the East China Sea. Partial DNA sequences of the cytochrome c oxidase subunit I and 16S ribosomal RNA genes were determined for D. tobasuii sp. nov. These findings represent the first records of Dendrogaster from the host family Goniasteridae in Japan.

著者

Hiroyuki Ariyama Nobuhiro Saito Michitaka Shimomura

出版者

Carcinological Society of Japan

雑誌

Crustacean Research (ISSN:02873478)

巻号頁・発行日

vol.45, pp.29-35, 2016 (Released:2016-07-08)

参考文献数

13

被引用文献数

1 2

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A new species of the euphausiid-ectoparasitic isopod in the genus Heterophryxus Sars, 1885 is described based on an immature female specimen collected from the central North Pacific. The new species, Heterophryxus pacificus, can be distinguished from the immature females of H. appendiculatus Sars, 1885 and H. elongatus Schultz, 1977 in having (1) a wider and thicker body, (2) a cephalon without an anterior hollow, and (3) complex-shaped pereomeres 2 to 4. A diagnosis of the genus Heterophryxus is provided.