Crustacean Research

Taxonomy, distribution and ecology of the Setose Yabby, Cherax setosus (Riek, 1951)

Robert B. McCormack, Jason Coughran

Article type: Article
2011 Volume 40 Pages 1-11
Published: 2011
Released on J-STAGE: May 15, 2017

DOIhttps://doi.org/10.18353/crustacea.40.0_1

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Although it occurs near one of Australia's largest cities, there is a remarkable lack of information on the Setose Yabby, Cherax setosus. The morphology of the species has never been thoroughly described, and basic information on its distribution and ecology is required. In this paper, we give a thorough redescription of the species and present data on its distribution, habitat and general biology. Cherax setosus is a medium-sized crayfish with a lowland, coastal distribution extending from just south of Taree to just north of Morisset in eastern New South Wales, a northeast-southwest distance of approximately 150km. The species is rarely found in permanent aquatic habitats in the area, but builds extensive burrow networks in minor, ephemeral habitats such as gullies, roadside ditches, stump holes, swamps and pastures. Although it appears to be relatively common across its range, the species may be susceptible to impacts such as reproductive interference with the translocated crayfish C. destructor and predation on juveniles by the introduced plague minnow, Gambusia holbrooki.

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A rare macrophthalmine crab, Euplax leptophthalmus H. Milne Edwards, 1852 (Decapoda, Brachyura, Macrophthalmidae) from Amami-Oshima Island, Ryukyu Islands, southern Japan

Tei Kishino, Toshihiko Yonezawa, Keiji Wada

Article type: Article
2011 Volume 40 Pages 13-20
Published: 2011
Released on J-STAGE: May 15, 2017

DOIhttps://doi.org/10.18353/crustacea.40.0_13

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The rare macrophthalmine crab, Euplax leptophthalmus H. Milne Edwards, 1852, is recorded from Japan for the first time. Numerous specimens were obtained from tidal muddy mangrove creeks on Amami-Oshima Island. Variation is discussed with regard to sexual and size differences. Differences with the allied E. dagohoyi (Mendoza & Ng, 2007) from the Philippines are also discussed.

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Two new freshwater crabs of the genus Geothelphusa Stimpson, 1858 (Crustacea: Decapoda: Brachyura: Potamidae) from islands of southern Kyushu, Japan

Hiroshi Suzuki, Toshiaki Kawai

Article type: Article
2011 Volume 40 Pages 21-31
Published: 2011
Released on J-STAGE: May 15, 2017

DOIhttps://doi.org/10.18353/crustacea.40.0_21

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Two new freshwater crabs, Geothelphusa koshikiensis and G. mishima, are described from Koshiki Islands, and Uji, Kuchierabu and Kuroshima (one of the Mishima Islands) of Kagoshima Prefecture, southern Kyushu, Japan, respectively. Both species have previously been confounded with G. dehaani, widely distributed in Japanese mainland (Kyushu to Honshu). The new species are differentiated from one another and other congeners by morphological characters and coloration in life.

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New record of Aegiochus spongiophila (Semper) (Isopoda: Aegidae), inhabiting the hexactinellid sponge Euplectella oweni Herklots & Marshall from off Makurazaki, southern Kyushu, Japan

Nobuhiro Saito, Tomomi Saito

Article type: Article
2011 Volume 40 Pages 33-40
Published: 2011
Released on J-STAGE: May 15, 2017

DOIhttps://doi.org/10.18353/crustacea.40.0_33

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The aegid isopod Aegiochus spongiophila (Semper, 1867) was recorded from Japanese waters for the first time. The specimens were collected from off Makurazaki, southern Kyushu, Japan, mainly inhabiting the cavity of the hexactinellid sponge Euplectella oweni Herklots & Marshall, 1868. One specimen of A. spongiophila was found in the gill cavity of the sea toad Chaunax abei Le Danois, 1978. Aegiochus spongiophila is characterized by 1) long antenna, reaching the posterior margin of pereonite 6, 2) pentagonal frontal lamina, 1.2 times as long as width, 3) inferodistal lobes produced on the carpus of pereopods 2 and 3, 4) long appendix masculina, 1.7 times as long as endopod of pleopod 2, 5) uropodal exopod narrower, 2.6 times as long as width, mesial and distal lateral margins with 6-8 and 10-12 robust setae, respectively, 6) produced caudomedial point, with 15-17 robust setae on the posterior margin of pleotelson.

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Further occurrences of tegumental scales in caridean shrimp (Crustacea: Decapoda: Caridea)

Sammy De Grave, Louisa Wood

Article type: Article
2011 Volume 40 Pages 41-50
Published: 2011
Released on J-STAGE: May 15, 2017

DOIhttps://doi.org/10.18353/crustacea.40.0_41

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Tegumental scales are documented in two families of Caridea, viz. Hippolytidae (genus Lysmata) and Rhynchocinetidae (genera Cinetorhynchus and Rhynchocinetes), raising to seven the number of families in which such scales occur. The scales in Rhynchocinetidae are similar to those in Pandalidae, but the scales in Lysmata spp. are of a slightly different type than previously documented. SEM observations reveal that the scales easily abrade and attention is drawn to the possibility that tegumental scales may be more widespread across families, but are difficult to observe. Caution is advised when considering differences in pattern (not form) between species given this high potential for abrasion. Given the low number of documented occurrences across families and genera, the potential phylogenetic information content of tegumental scales is currently unknown, but could be informative.

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Comparison of mating behavior of the fiddler crab Uca lactea in relation to density

Misuzu Aoki, Keiji Wada

Article type: Article
2011 Volume 40 Pages 51-55
Published: 2011
Released on J-STAGE: May 15, 2017

DOIhttps://doi.org/10.18353/crustacea.40.0_51

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In the fiddler crab Uca lactea, the relative frequencies of two mating types, surface mating and underground mating, were compared between high-density and low-density areas. The proportions of the two mating types were not different between the two sites. The proportions of wandering females and waving males were not different between the two sites. Thus, the population density of U. lactea did not influence the frequency of these mating-related behaviors or the relative frequencies of the two mating types.

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Complete larval development of crinoid-symbiotic crab, Tiaramedon spinosum (Miers, 1879) (Decapoda, Brachyura, Pilumnidae, Eumedoninae), described from laboratory-reared materials

Yoshihisa Fujita

Article type: Article
2011 Volume 40 Pages 57-73
Published: 2011
Released on J-STAGE: May 15, 2017

DOIhttps://doi.org/10.18353/crustacea.40.0_57

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The complete larval development of Tiaramedon spinosum (Miers, 1879), an obligate symbiotic crab of comatulid crinoids, is described and illustrated on the basis of laboratory-reared material. It consists of four zoeal stages and one megalop. Zoeas of T. spinosum are readily distinguished from those of other eumedoniine species by the armature on the carapace and bases of the first and second maxillipeds. Morphology of the T. spinosum megalop differs from that of Echinoecus pentagonus and Zebrida adamsi in the shape of the carapace, segmentation of the antennal flagellum, and setation of the second maxillipedal epipod and uropodal protopod.

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The setae of the gill-cleaning mechanism in the soldier crab Mictyris guinotae Davie, Shih and Chan, 2010 (Decapoda: Brachyura: Mictyridae)

Takashi Matsuoka, Hiroshi Suzuki, Miguel Vazquez Archdale

Article type: Article
2011 Volume 40 Pages 75-80
Published: 2011
Released on J-STAGE: May 15, 2017

DOIhttps://doi.org/10.18353/crustacea.40.0_75

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The setae involved in gill-cleaning in the soldier crab Mictyris guinotae were examined using a light microscope and an environmental scanning electron microscope. The setae of the epipods of the first and third maxillipeds are classified into three types: 1) anchor setae, 2) digitate-scale-setule setae, and 3) denticulate setae. The second maxillipeds lack epipods, and this absence can be explained in relation to the presence of the cup-shaped basal part of the third maxilliped epipod. The presence of anchor setae in M. guinotae may support the hypothesis that anchor setae are a brachyuran synapomorphy. The full anchor form may result from a fusing of the denticules on denticulate setae. The presence of digitate-scale-setule setae in M. guinotae may confirm that digitate-scale-setule setae are the ancestral character.

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Life history of Neomysis mirabilis (Crustacea: Mysidacea) in Notoro Lagoon, Hokkaido, Japan

Takashi Yusa, Seiji Goshima

Article type: Article
2011 Volume 40 Pages 81-92
Published: 2011
Released on J-STAGE: May 15, 2017

DOIhttps://doi.org/10.18353/crustacea.40.0_81

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The life history of Neomysis mirabilis was studied in Notoro Lagoon, north-eastern Hokkaido, Japan from April 2006 to November 2006. Cohort analysis revealed that this species was composed of five assemblages over the course of a year. By comparing life history traits such as growth rate, mature size and brood size of each group, it was revealed that N. mirabilis was consisted of three generations, wintering-, spring- and summer generations, in Notoro Lagoon. These three generations had different growth rate, mean maximum carapace length, mature size and brood size. Maximum CLs were inversely correlated to the seawater temperatures they experienced, which was coincident to the well-known temperature-size rule. These seasonal changes in the life history traits could affect abundance, behavior and distribution of the other organisms particularly on possible predators in the lagoon.

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[title in Japanese]

Article type: Appendix
2011 Volume 40 Pages App2-
Published: 2011
Released on J-STAGE: May 15, 2017

DOIhttps://doi.org/10.18353/crustacea.40.0_App2

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