著者

Kooichi Konishi Takashi Yanagimoto Seinen Chow

出版者

The Japanese Society of Systematic Zoology

雑誌

Species Diversity (ISSN:13421670)

巻号頁・発行日

vol.27, no.2, pp.243-249, 2022-07-29 (Released:2022-07-29)

参考文献数

36

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A giant phyllosoma larva, assigned to the final stage, was collected from off Peru. This specimen was determined to be Projasus bahamondei George, 1976 by DNA barcoding, and morphological description was given for the first time in the genus Projasus George and Grindley, 1964. The present phyllosoma was characteristic of having very wide cephalic shield (about 2.3 times of thorax width), median rostrum, eminent setose exopods on the second and third maxillipeds, and five stout spines on basial endite of maxillule. Projasus phyllosoma has morphological characteristics of both ‘Silentes’ and ‘Stridentes’ groups in the family Palinuridae.

著者

Seinen Chow Katsuyuki Hamasaki Kooichi Konishi Takashi Yanagimoto Ryota Wagatsuma Haruko Takeyama

出版者

Carcinological Society of Japan

雑誌

Crustacean Research (ISSN:02873478)

巻号頁・発行日

vol.52, pp.31-48, 2023-02-18 (Released:2023-02-18)

参考文献数

69

被引用文献数

1

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Lithodoid and paguroid crabs are morphologically assigned to the superfamilies Lithodoidea and Paguroidea, respectively. Molecular analyses, however, have revealed closer genetic proximity of the lithodoid crabs to the family Paguridae than to other families of Paguroidea, provoking a long debate. We investigated the length and nucleotide sequence variation of the nuclear ribosomal DNA internal transcribed spacer 1 (ITS1) in lithodoid and paguroid species. Uniquely short ITS1s (215–253 bp) were observed in seven lithodoid species. In contrast, ITS1 length varied considerably in 13 paguroid species belonging to the families Coenobitidae, Diogenidae, and Paguridae. Short-to-long ITS1s (238–1090 bp) were observed in five species of the family Paguridae, and medium to long ITS1s (573–1166 bp) were observed in eight species of the families Coenobitidae and Diogenidae. Considerably different size ITS1s coexisted in individual paguroid species. Nucleotide sequence analysis indicated that the short ITS1s observed in the family Paguridae were descendants of longer ITS1s and were homologous to the short ITS1 of lithodoid species. ITS1 sequences of the families Coenobitidae and Diogenidae shared no nucleotide elements with lithodoid and pagurid species. These molecular signals indicate that the short ITS1 in pagurid lineage was passed on to lithodoid lineage, strongly supporting the “hermit-to-king” crab hypothesis.

著者

Kooichi Konishi Munehiro Takami Takashi Yanagimoto

出版者

Carcinological Society of Japan

雑誌

Crustacean Research (ISSN:02873478)

巻号頁・発行日

vol.50, pp.1-7, 2021 (Released:2020-12-24)

参考文献数

23

被引用文献数

2

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A morphological description is given for the postlarval specimen of the polychelid lobster, Pentacheles laevis, collected from Suruga Bay, on the Pacific coast of Japan. The specimen has been previously identified using the DNA barcoding method. Diagnostic larval characters distinguishing the previously known postlarvae in three genera, Pentacheles, Stereomastis, and Polycheles, are also noted.

著者

Kooichi Konishi Munehiro Takami Takashi Yanagimoto

出版者

Carcinological Society of Japan

雑誌

Crustacean Research (ISSN:02873478)

巻号頁・発行日

vol.52, pp.55-67, 2023-08-31 (Released:2023-08-31)

参考文献数

42

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A morphological description of the postlarval specimen of the polychelid lobster Stereomastis panglao Ahyong & Chan, 2008, collected from Suruga Bay, on the Pacific coast of Japan, and at depths of 1,305–1,565 m, was given for the first time. Larval characteristics of the previously known polychelid postlarvae and the distribution range of S. panglao were also noted.

著者

Mai Hibino Koji Matsuzaki Kooichi Konishi

出版者

Carcinological Society of Japan

雑誌

Crustacean Research (ISSN:02873478)

巻号頁・発行日

vol.49, pp.9-14, 2020-01-15 (Released:2020-01-15)

参考文献数

23

被引用文献数

2

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First stage larva of the deep-sea giant shrimp, Sclerocrangon rex is described and illustrated under laboratory conditions. The larvae hatched in the most advanced condition, such as in having stalked eyes, among the congeneric species with abbreviated development. The newly hatched first larvae were staying together by clinging maternal pleopods until the second stage.