Species Diversity

Peregrinamor gastrochaenans (Bivalvia : Mollusca), a New Species Symbiotic with the Thalassinidean Shrimp Upogebia carinicauda (Decapoda : Crustacea)

Makoto Kato, Gyo Itani

Article type: Article
2000 Volume 5 Issue 4 Pages 309-316
Published: November 30, 2000
Released on J-STAGE: March 30, 2018

DOIhttps://doi.org/10.12782/specdiv.5.309

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A new species of the hitherto monotypic bivalve genus Peregrinamor (Galeommatidae) was found attached to the ventral side of the cephalothorax of a small thalassinidean shrimp, Upogebia carinicauda (Stimpson, 1860) (Upogebiidae) collected from tidal flats of Amami-Ohshima Island, Ryukyu Archipelago in Japan. The bivalve is dorso-ventrally flattened and pilfers suspended matter intercepted by the host's filtering basket. This new species, Peregrinamor gastrochaenans, can be discriminated from the type species of the genus, P. ohshimai Shoji, 1938, by its laterally more inflated shell with a permanent postero-ventral gape and by the expanded, fleshy posterior mantle protruding from the gape. Adaptations of the bivalve to the small host species and possible functions of the postero-ventral gape are discussed.

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New Peracarids (Crustacea : Malacostraca) from the Atlantic Deep Sea off Angola

Roger N. Bamber

Article type: Article
2000 Volume 5 Issue 4 Pages 317-328
Published: November 30, 2000
Released on J-STAGE: March 30, 2018

DOIhttps://doi.org/10.12782/specdiv.5.317

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Tanaidacean and anthurid isopod material from the benthos at 1300m depth off Angola is described, including a new species of each of Malacanthura (Isopoda, Anthuridae) and of Collettea (Tanaidacea, Anarthruridae). The known ranges of Pseudotanais denticulatus Bird and Holdich, 1989, Paranarthrura intermedia Kudinova-Pasternak, 1982, and P. insignis Hansen, 1913 are extended further south in the Atlantic.

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Larval Development of the Swimming Crab Charybdis natator (Crustacea : Brachyura : Portunidae) Reared in the Laboratory

Md. Sirajul Islam, Shigemitsu Shokita, Takeshi Higa

Article type: Article
2000 Volume 5 Issue 4 Pages 329-349
Published: November 30, 2000
Released on J-STAGE: March 30, 2018

DOIhttps://doi.org/10.12782/specdiv.5.329

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The larval development of the swimming crab Charybdis natator (Herbst, 1789) was studied from first zoea to megalopa under laboratory conditions. Six zoeal stages and one megalopal stage were identified, and detailed descriptions and illustrations are provided for each stage. At an average salinity and temperature of 31±1‰ and 23±1℃, the megalopa was attained 38 days after hatching. Morphologically, the first zoea of C. natator is very similar to those of other species of Charybdis in having lateral spines on the carapace ; three pairs of serrate setae on the posterior margin of the telson furca ; one plus six setae on the endopod of the maxillule ; and five setae on the endopod of the maxilla. The differences between the first zoea and megalopa of C. natator and those of its congeners are discussed.

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Two New Species of the Family Zetomotrichidae (Acari : Oribatida) from Japan

Jun-ichi Aoki, Yoshiko Hirauchi

Article type: Article
2000 Volume 5 Issue 4 Pages 351-359
Published: November 30, 2000
Released on J-STAGE: March 30, 2018

DOIhttps://doi.org/10.12782/specdiv.5.351

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Two new species of oribatid mites of the family Zetomotrichidae, Ghilarovus saxicola sp. nov. and Mabulatrichus litoralis sp. nov., are described from cliffside habitats of Japan. The authorship of the name Zetomotrichus bidentata Hammer, 1977 is discussed.

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Two New Mite Species of the Genus Thinoseius (Acari : Gamasida : Eviphididae) from Japan

Gen Takaku

Article type: Article
2000 Volume 5 Issue 4 Pages 361-374
Published: November 30, 2000
Released on J-STAGE: March 30, 2018

DOIhttps://doi.org/10.12782/specdiv.5.361

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Two new mite species of the genus Thinoseius are described and illustrated on the basis of material collected from intertidal zones in northern Japan. Another intertidal species, Thinoseius occidentalipacificus Klimov, 1998, is recorded from Japan for the first time. Thinoseius sawadai sp. nov. and T. occidentalipacificus inhabit tidal wrack, and T. setifer sp. nov. was found on the pleopods of the sea slater Ligia cinerascens Budde-Lund, 1885 (Isopoda). This is the first record of eviphidid mites from a ligiid isopod. The deutonymphs of T. occidentalipacificus and T. setifer show a probable sexual dimorphism in the number of dorsal and/or opisthogastric setae.

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Onychomesa gokani, a New Emesine Assassin Bug (Insecta : Heteroptera : Reduviidae) from Japan

Tadashi Ishikawa

Article type: Article
2000 Volume 5 Issue 4 Pages 375-379
Published: November 30, 2000
Released on J-STAGE: March 30, 2018

DOIhttps://doi.org/10.12782/specdiv.5.375

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The reduviid genus Onychomesa Wygodzinsky, 1966 is reported from Japan for the first time, with the description of the new species O. gokani. The species inhabits grassy vegetation of Iriomote-jima Island, the Ryukyus, Japan.

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Affinities of the Australian Paper Wasp Ropalidia proletaria (Insecta : Hymenoptera : Vespidae), with Descriptions of Males, Mature Larvae, and a Nest

Jun-ichi Kojima

Article type: Article
2000 Volume 5 Issue 4 Pages 381-390
Published: November 30, 2000
Released on J-STAGE: March 30, 2018

DOIhttps://doi.org/10.12782/specdiv.5.381

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The males, mature larvae, and a nest of an Australian paper wasp, Ropalidia proletaria Richards, 1978, are described for the first time. Not only the female adult morphology but also the morphologies of the male, larva, and nest suggest that R. proletaria is closely related to R. plebeiana Richards, 1978, rather than to R. revolutionalis (de Saussure, 1853) as Richards (1978) suggested.

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Parasikukia maculata, a New Genus and New Species of Cyprinid Fish from Peninsular Thailand

Atsushi Doi

Article type: Article
2000 Volume 5 Issue 4 Pages 391-396
Published: November 30, 2000
Released on J-STAGE: March 30, 2018

DOIhttps://doi.org/10.12782/specdiv.5.391

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Parasikukia maculata, a new genus and species of Cyprinidae, is described on the basis of two specimens collected from a small river in Phetchaburi Province, Thailand. The new form is similar to the species of Sikukia in having a deep body and adipose eyelids, but it differs from the latter in the cephalic lateral line system, the shape and number of gill rakers, the numbers of circumpeduncular scales and vertebrae, the position of the lateral line on the caudal peduncle, and the shape of the second hypural. Parasikukia maculata is unique among the small barbs of Southeast Asia in having a small, distinct, dark, saddle-shaped spot anterior to the origin of the dorsal fin.

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