著者

山下 龍之丞 碧木 健人 山川 宇宙

出版者

日本甲殻類学会

雑誌

CANCER (ISSN:09181989)

巻号頁・発行日

vol.31, pp.43-48, 2022-08-01 (Released:2022-08-24)

参考文献数

19

---

Alpheus dolichodactylus Ortmann, 1890 burrows muddy tidal flats, recorded from inshore coastal areas in central to southwestern Japan. Because of abrupt loss of habitats caused by human activities, the conservation status of the species is ranked as NT in the Japanese Red List. For example, the syntype of the species consists of 15 specimens from the Tokyo Bay, but there have been no records of the species since the original description from the Tokyo Bay and adjacent areas. In this study, we report on the occurrence of three specimens of A. dolichodactylus from small muddy tidal flat at the river mouth of the Heguri River in the Tatetama Bay, southern part of the Boso Peninsula, located at the outer part of the Tokyo Bay, represent the rediscovery of the species from the Tokyo Bay and adjacent areas by 129 years since the collection of the syntype. We also provide a description of the habitats where our specimens were collected. Maintenance of muddy substrate at estuarine areas will contribute to recovery of local population of the species.

著者

山下 龍之丞 是枝 伶旺 古

出版者

日本甲殻類学会

雑誌

CANCER (ISSN:09181989)

巻号頁・発行日

vol.29, pp.39-44, 2020-08-01 (Released:2020-09-09)

参考文献数

15

---

The varunid crab Cyclograpsus pumilio Hangai and Fukui, 2009 is mainly distributed in central-western Honshu, Shikoku and northern Kyushu in Japan. Three males and 9 females of C. pumilio were collected from the Boso Peninsula of Chiba Prefecture in eastern Honshu and the Satsuma Peninsula of Kagoshima Prefecture in southern Kyushu, Japan. In the both sites, C. pumilio were found under gravels deposited in the upper intertidal zone. This is the first record of C. pumilio from the both prefectures, representing its easternmost and southernmost records.

著者

山下 龍之丞 乾 直人 山川 宇宙 矢野 優貴

出版者

神奈川県立生命の星・地球博物館(旧神奈川県立博物館)

雑誌

神奈川自然誌資料 (ISSN:03889009)

巻号頁・発行日

vol.2020, no.41, pp.21-26, 2020 (Released:2020-03-20)