Crustacean Research

Scutumara enodis, a new genus and species of grapsid crab (Decapoda: Grapsidae) from Okinawa, Ryukyus, Japan

Peter K.L. Ng, Yukio Nakasone

Article type: Article
1993 Volume 22 Pages 1-6
Published: November 10, 1993
Released on J-STAGE: May 15, 2017

DOIhttps://doi.org/10.18353/crustacea.22.0_1

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A new genus and species of coral reef grapsid crab, Scutumara enodis, is described from Okinawa, Ryukyus, Japan. The new genus is allied to Pseudograpsus H. Milne Edwards, 1837, but differs in having the carapace longer than broad, the dorsal surfaces smooth and glabrous without distinct regions, the epigastric cristae weak or absent and the front well produced. Additionally, the fingers do not form a gape when closed. Two other species, Pseudograpsus laniger Tesch, 1918, and Pseudograpsus miyakei Nakamura & Takeda, 1972, are also tentatively referred to the genus Scutumara.

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A new deep-sea crab, genus Chaceon, from the Austral Islands, southwestern Pacific Ocean (Decapoda: Geryonidae)

Raymond B. Manning

Article type: Article
1993 Volume 22 Pages 7-10
Published: November 10, 1993
Released on J-STAGE: May 15, 2017

DOIhttps://doi.org/10.18353/crustacea.22.0_7

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Chaceon australis, the sixth species of the genus recorded from localities in the Pacific Ocean, is described. It most closely resembles C. pbupini Manning, from the Marquesas Islands, but has a smoother carapace, shows differences in relative distances between the anterolateral teeth of the carapace, has a distal spine on the merus of the walking legs, and has a different color in life.

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A new genus of Parapaguridae (Decapoda: Anomura)

Rafael Lemaitre

Article type: Article
1993 Volume 22 Pages 11-20
Published: November 10, 1993
Released on J-STAGE: May 15, 2017

DOIhttps://doi.org/10.18353/crustacea.22.0_11

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A new monotypic genus, Bivalvopagurus, is described for Sympagums sinensis (de Saint Laurent), a species of Parapaguridae known so far only from the China Sea. The new genus is distinguished from other genera in the family by the presence of paired pleopods in both sexes, calcification of the shield, posterior carapace, and tergites of the first two abdominal somites, and symmetry of the uropods and telson. The only species in the new genus commonly uses a bivalve shell with an actinian as means of partially protecting its abdomen. This species is redescribed and illustrated, and some evolutionary comments are made.

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Deep-sea shrimps of the family Aristeidae (Decapoda: Dendrobranchiata) from northern Japan, with the description of a new species of the genus Aristeus

Tomoyuki Komai

Article type: Article
1993 Volume 22 Pages 21-33
Published: November 10, 1993
Released on J-STAGE: May 15, 2017

DOIhttps://doi.org/10.18353/crustacea.22.0_21

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Five species belonging to the family Aristeidae are reported from the Pacific coast of northern Japan. One, Aristeus pallidicauda, is described as new based on a male and female specimens from off Miyako, Iwate Prefecture, at depths of 500-700 m. Plesiopenaeus edwardsianus (Johnson, 1867) is reported from northern Japan for the first time. Three species previously recorded from this area also included, Aristaeomorpha foliacea (Risso, 1827), Aristeus virilis (Bate, 1881), and Aristeus mabahissae Ramadan, 1938. The present material represents the northern limit of the distribution of these species in the western Pacific.

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Observations on the internal asymmetry of the sternal artery and the cheliped asymmetry in selected decapod crustaceans

Michio Imafuku

Article type: Article
1993 Volume 22 Pages 35-43
Published: November 10, 1993
Released on J-STAGE: May 15, 2017

DOIhttps://doi.org/10.18353/crustacea.22.0_35

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As a measure of internal asymmetry, laterality of the sternal artery was studied in selected species of penaeoideans, carideans, astacideans, thalassinideans, anomurans and brachyurans. Special attention was paid to a possible relationship to the asymmetry of the chelipeds. Studies showed that laterality of the artery is not related to that of the major cheliped. In penaeoideans, carideans, thalassinideans and brachyurans, an almost even variation in left and right arteries was observed, whereas hermit crabs carrying gastropod shells exclusively possessed a left-sided sternal artery. The left-sided sternal artery was also found in the Lithodidae, but not in the Pomatochelidae. The tendency for a left-sided sternal artery was observed in the Astacidae, while the reversed tendency was found in the Porcellanidae.

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Gonopods of the red frog crab Ranina ranina Linnaeus (Decapoda: Raninidae)

Megumi Minagawa

Article type: Article
1993 Volume 22 Pages 45-54
Published: November 10, 1993
Released on J-STAGE: May 15, 2017

DOIhttps://doi.org/10.18353/crustacea.22.0_45

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The external and internal features of the first and second gonopods of the adult male red frog crab Ranina ranina were examined as one of a series of the reproductive studies. In the endopod of the first gonopod, an ejaculatory canal was formed a quarter from the proximal region and a cuticular plate was observed at the apical region. The second gonopod had a spoon-like stalk region, vertically divided into two halves by a central wall. Histological examination showed that the gonopods consist of cuticle, hypodermis, loose connective tissue, striated muscles and tegumental glands. The tegumental glands are present in the proximal region of both gonopods but are not abundant. Extracellular space located at the center of the gland was PAS positive. The transferance of spermatophore to spermathecae and the function of the tegumental gland are discussed.

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Distribution of freshwater caridean shrimps and prawns (Atyidae and Palaemonidae) from Southern Kyushu and adjacent islands, Kagoshima Prefecture, Japan

Hiroshi Suzuki, Noboru Tanigawa, Takayuki Nagatomo, Eiji Tsuda

Article type: Article
1993 Volume 22 Pages 55-64
Published: November 10, 1993
Released on J-STAGE: May 15, 2017

DOIhttps://doi.org/10.18353/crustacea.22.0_55

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Seventeen species of freshwater caridean shrimps and prawns (Atyidae and Palaemonidae) are recorded from mainland Kagoshima, Uji Gunto, Ohsumi Shoto and Tokara Retto, Southern Japan. Distribution of three Macrobrachium prawns: M. equidens, M. latimanus and M. gracilirostre, are newly recorded in the surveyed areas by the present study. Though the fauna of the surveyed areas has many tropical and subtropical species, it is characterized as a complex mixture of southern and northern species. In the Sendai, Manose and Kimotsuki Rivers, the longitudinal distribution of shrimps was also surveyed. The distribution is affected by a dam or a natural vertical wall as mentioned in previous papers. The amphidromous species, Caridina leucosticta, C. serratirostris, C. typus, M.formosense, and M. japonicum, inhabited slow flowing reaches near the river mouth, while the landlocked Neocaridina denticulata and Palaemon (Palaemon) paucidens were distributed upstream from the dam or the steep reaches.

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A new species of sesarmine crab (Brachyura: Grapsidae) from Japan and Taiwan, previously known as Sesarma erythodactyla Hess, 1865

Peter J. F. Davie

Article type: Article
1993 Volume 22 Pages 65-74
Published: November 10, 1993
Released on J-STAGE: May 15, 2017

DOIhttps://doi.org/10.18353/crustacea.22.0_65

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A new species of intertidal sesarmine crab, Parasesarma acts, is described from Japan and Taiwan. This species has been known under the name Sesarma (Parasesarma) erythodactyla Hess, 1865, but it is established here that P. erythodactyla is endemic to the eastern coast of Australia. Parasesarma ads is known to occur from Sagami Bay, Japan, south to Taiwan, but there are no mainland records. The two species can be easily separated on male chela characters, including the shape and number of the dactylar tubercles, and the disposition of the dorsal pectinate crests.

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Growth and reproduction of the spider crab, Pugettia quadridens quadridens (De Haan) (Brachyura: Majidae)

Reiko Fuseya, Seiichi Watanabe

Article type: Article
1993 Volume 22 Pages 75-81
Published: November 10, 1993
Released on J-STAGE: May 15, 2017

DOIhttps://doi.org/10.18353/crustacea.22.0_75

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The growth and reproduction of the spider crab Pugettia quadridens quadridens were investigated from April 1992 to April 1993 at the Banda Marine Laboratory of Tokyo University of Fisheries, Chiba Prefecture. The larvae of P. quadridens quadridens hatch in February to August, and metamorphose to juveniles (first stage crabs) after about 17 days. The juveniles grow over the autumn to winter period. Between January and March the puberty molt which is also the terminal molt occurred in females; this was marked by the development of the secondary sexual characteristics. Soon after the puberty molt females mate and spawn. Spawning is carried out several times during a reproductive season. At about 20 days after spawning the larvae hatch, and on the same day the next brood of eggs is deposited. In summer most adults finish breeding and die. The life span of P. quadridens quadridens is estimated to be about one year in this study area.

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Differentiation of cheliped asymmetry in the fiddler crab, Uca arcuata (De Haan, 1833)

Takuya Otani

Article type: Article
1993 Volume 22 Pages 83-87
Published: November 10, 1993
Released on J-STAGE: May 15, 2017

DOIhttps://doi.org/10.18353/crustacea.22.0_83

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By rearing crabs from the first zoeal stage onward, transition of the cheliped condition in Uca arcuata was studied. All the first crabs had two small chelipeds. A crab stage having only one large cheliped on either left or right side (no cheliped on the other side) was preceded by a stage having two large chelipeds. Crabs bearing asymmetrical chelipeds appeared next and increase in number commensurate with decrease of crabs bearing only one large cheliped. This observation, as well as examination of samples collected from a natural population suggests that the differentiation process of handedness in Uca arcuata is the same as that demonstrated for Uca lactea by Yamaguchi (1977).

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[title in Japanese]

Article type: Bibliography
1993 Volume 22 Pages 89-91
Published: November 10, 1993
Released on J-STAGE: May 15, 2017

DOIhttps://doi.org/10.18353/crustacea.22.0_89

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[title in Japanese]

Article type: Appendix
1993 Volume 22 Pages 92-
Published: November 10, 1993
Released on J-STAGE: May 15, 2017

DOIhttps://doi.org/10.18353/crustacea.22.0_92

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