Species Diversity

Two New Species of Tremex Jurine (Hymenoptera : Siricidae) from Japan

Ichiji Togashi

Article type: Article
1997 Volume 2 Issue 1 Pages 1-6
Published: June 30, 1997
Released on J-STAGE: March 30, 2018

DOIhttps://doi.org/10.12782/specdiv.2.1

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Two new species of woodwasps, Tremex okinawensis sp. nov. and T. kaedei sp. nov., from Japan are described and illustrated, and a key is provided for the Japanese species of Tremex.

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Larval Development of a Grapsid Crab, Helice formosensis Rathbun (Crustacea : Brachyura), Reared in the Laboratory

M. Younus Mia, Shigemitsu Shokita

Article type: Article
1997 Volume 2 Issue 1 Pages 7-23
Published: June 30, 1997
Released on J-STAGE: March 30, 2018

DOIhttps://doi.org/10.12782/specdiv.2.7

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The complete larval development of Helice formosensis was obtained in the laboratory. It consisted of 5 zoeal and 1 megalopa stages before moulting to the first crab instar on the 47th day at a water temperature of 15-22℃. The morphology of the larvae is described in detail and comparisons are made with larvae of other species of Helice.

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Bryocamptus yohteiensis, a New Harpacticoid Copepod (Crustacea) from Hokkaido, Japan

Teruo Ishida

Article type: Article
1997 Volume 2 Issue 1 Pages 25-30
Published: June 30, 1997
Released on J-STAGE: March 30, 2018

DOIhttps://doi.org/10.12782/specdiv.2.25

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A new species of harpacticoid copepod, Bryocamptus yohteiensis, is described. Specimens of this new species were collected from puddles on the streamside of a willow grove in Kutchan, located on the north of Mt. Yohtei in Hokkaido, Japan. The species is close to B. umiatensis Wilson, 1958 known from Alaska, Kamchatka, and Sakhalin Island. This is the seventh species of the genus reported from Japan.

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Halacarid Mites of the Genus Actacarus (Acari : Halacaridae) from Hokkaido, Northern Japan

Hiroshi Abe

Article type: Article
1997 Volume 2 Issue 1 Pages 31-42
Published: June 30, 1997
Released on J-STAGE: March 30, 2018

DOIhttps://doi.org/10.12782/specdiv.2.31

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Three species of the marine mite genus Actacarus occurring on the coast of Hokkaido, northern Japan, are described. Actacarus pacificus Bartsch was found in the subtidal zone of Teuri Island ; this species is recorded from the northwestern Pacific for the first time. Actacarus illustrans Newell was taken from the intertidal zone in Oshoro Bay, the Sea of Japan. A new species, A. octosetus, is described on the basis of specimens from intertidal sandy sediment in Uchiura Bay, southern Hokkaido. The new species is easily distinguished from its congeners in having 4 pairs of perigenital setae in the female and 34-40 perigenital setae in the male. Marine suctorians are associated with A. octosetus. A key to the Actacarus species in Hokkaido is given.

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Two Pycnogonids (Arthropoda) from the Coral Sea Region : a New Callipallene and a Reassessment of the Anoplodactylus cribellatus Complex

Roger N. Bamber

Article type: Article
1997 Volume 2 Issue 1 Pages 43-50
Published: June 30, 1997
Released on J-STAGE: March 30, 2018

DOIhttps://doi.org/10.12782/specdiv.2.43

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Pycnogonid material from New Caledonia and the Great Barrier Reef has been examined. Callipallene ersei sp. nov. is described from the infralittoral sand of New Caledonia. Specimens from both regions have allowed the reassessment of Anoplodactylus species with more than 10 cribellate cement gland pores per femur : all (other than A. laciniosus Child, 1995) are assigned to A. cribellatus Calman, 1923, including A perforatus Nakamura and Child, 1982 and A. simplex Clark, 1963 as junior synonyms.

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A New Genus, Idatenopsocus, of the Family Mesopsocidae (Insecta : Psocoptera) and Its Phylogenetic Position

Kazunori Yoshizawa, Charles Lienhard

Article type: Article
1997 Volume 2 Issue 1 Pages 51-58
Published: June 30, 1997
Released on J-STAGE: March 30, 2018

DOIhttps://doi.org/10.12782/specdiv.2.51

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A new genus, Idatenopsocus, represented by Idatenopsocus orientalis (Vishnyakova, 1986), comb, nov., is described and the species is redescribed. Within the family Mesopsocidae, this new genus is considered as the sister group of a monophyletic group composed of the genera Mesopsocus, Microtrichipsocus, Metapsocus, Cyrtopsochus, Hexacyrtoma, and Rhinopsocus.

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A Revision of the Osmerid Genus Hypomesus Gill (Teleostei : Salmoniformes), with the Description of a New Species from the Southern Kuril Islands

Toshiro Saruwatari, Juan Andres Lopez, Theodore W. Pietsch

Article type: Article
1997 Volume 2 Issue 1 Pages 59-82
Published: June 30, 1997
Released on J-STAGE: March 30, 2018

DOIhttps://doi.org/10.12782/specdiv.2.59

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A systematic revision of the osmerid genus Hypomesus Gill, based on a detailed analysis of external and internal morphological characters, revealed the presence of six species, one of which is described as new. These six species fall readily into three species-groups : the Hypomesus nipponensis group, containing H. nipponensis McAllister, H. chishimaensis new species, and H. transpacificus McAllister ; the H. olidus group, containing only H. olidus Pallas ; and the H. japonicus group, containing H. japonicus Brevoort and H. pretiosus Girard. Synonymies, diagnoses, and descriptions are given for all taxa, geographic distributions are described and plotted, and a key to the species of the genus is provided.

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A Record of Chlamylla atypica (Bergh, 1899) (Gastropoda : Nudibranchia) from Japan

Yoshiaki J. Hirano

Article type: Article
1997 Volume 2 Issue 1 Pages 83-91
Published: June 30, 1997
Released on J-STAGE: March 30, 2018

DOIhttps://doi.org/10.12782/specdiv.2.83

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The flabellinid nudibranch Chlamylla atypica (Bergh, 1899) is described and illustrated based on more than 200 specimens collected from the Sea of Japan coast of Hokkaido, Japan. Notes on the diet, reproductive system, and prey-related colour differences are also given. The present record constitutes a southward range extension for the species.

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