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Paracerceis sculpta(Holmes,1904)[Crustacea:Isopoda:Sphaeromatidae]has been introduced into many localities inthe world and its distribution has spread steadily.From July,2000to October,2001,809individ uals of this species were collected... more
Paracerceis sculpta(Holmes,1904)[Crustacea:Isopoda:Sphaeromatidae]has been introduced into many localities inthe world and its distribution has spread steadily.From July,2000to October,2001,809individ uals of this species were collected from an artificial sandy beach in Osaka Bay,central Japan.Descriptions of the morphological characters of both sexes are given based on the specimens.Comparison of these specimens with specimens previously identified as Paracerceis japonica Nunomura,1988collected in 1986 from Uwajima in Ehime Prefecture revealed synonymy of the two species,indicating that the occurrence in Osaka Bay is the second record of Paracerceis sculpta from Japan.The species was collected throughout most of the study period,and the abundance increased during the study period.Large males having elongate uropods,non-ovigerous females and ju veniles were collected,with body lengths ranging from1 .3mm to10.3mm.Paracerceis sculpta was probably in troduced into Osaka Bay by ship-fou...
Kyoto University (京都大学)0048新制・論文博士博士(理学)乙第12007号論理博第1482号新制||理||1472(附属図書館)UT51-2007-H562京都大学大学院農学研究科水産学専攻(主査)教授 白山 義久, 教授 佐藤 矩行, 助教授 疋田 努学位規則第4条第2項該
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Two new species of Halacarsantia are described, as the first record of this genus from Japan. Halacarsantia ovata sp. nov. differs from its congeners in having coxal plates hidden in dorsal view on pereonites 1, 2 and 4-7,... more
Two new species of Halacarsantia are described, as the first record of this genus from Japan. Halacarsantia ovata sp. nov. differs from its congeners in having coxal plates hidden in dorsal view on pereonites 1, 2 and 4-7, dorsal-laterally situated eyes on head, without conspicuous bulging processes, pleopod 1 bearing 2 long ventral and 6 short apical setae, and sympod of pleopod 2 about three times as long as broad. Halacarsantia setosa is distinguishable from its congeners in having many dorsal robust setae on head, pereonites and pleotelson.
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The complete mitochondrial genome sequence of an estuarine amphipod Grandidierella osakaensis was determined. The mitochondrial genome was 14,658 bp in length with 37 mitochondrial genes (13 protein-coding genes [PCGs], 2 ribosomal RNAs... more
The complete mitochondrial genome sequence of an estuarine amphipod Grandidierella osakaensis was determined. The mitochondrial genome was 14,658 bp in length with 37 mitochondrial genes (13 protein-coding genes [PCGs], 2 ribosomal RNAs [rRNAs], and 22 transfer RNAs [tRNAs]). The order of PCGs of G. osakaensis was identical to those of other two Grandidierella species. A maximum likelihood-based phylogenetic analysis showed that G. osakaensis formed a monophyletic clade with the other two Grandidierella species within the infraorder Corophiida. The mitochondrial genome sequence obtained in this study provides useful information for further phylogenetic and ecological studies.
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̶Microjanira pacifica sp. nov. is described from the infralittoral zone of Wakayama Prefecture, middle Japan, as the first record for the genus from the Pacific. Microjanira pacifica differs from its congener in having posterolaterally... more
̶Microjanira pacifica sp. nov. is described from the infralittoral zone of Wakayama Prefecture, middle Japan, as the first record for the genus from the Pacific. Microjanira pacifica differs from its congener in having posterolaterally projecting pleopod 1, distolaterally expanded pleopod 2, slender appendix masculina, and the exopod of pleopod 3 shorter than half of second article of the endopod.
Two new species of Maera Leach, 1814 and Quadrimaera Krapp-Schickel & Ruffo, 2000 included in the Maera-clade are described from Japan. Maera denticoxa sp. nov. was collected from Iwate and Hokkaido Prefectures and can be distinguished... more
Two new species of Maera Leach, 1814 and Quadrimaera Krapp-Schickel & Ruffo, 2000 included in the Maera-clade are described from Japan. Maera denticoxa sp. nov. was collected from Iwate and Hokkaido Prefectures and can be distinguished from its congeners by the small notches on the posteroventral margins of coxae 1–6. Quadrimaera angulata sp. nov. from north of Tanegashima Island in Kagoshima Prefecture is characterized by the distal tooth on the mandibular palp article 1, the rounded palm of the female gnathopod 2, and the angular posterodistal margin of the pereopod 7 basis. Keys to Japanese species of the Maera-clade are provided. In total, seventeen species included in the clade occur in Japan.
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Six species of the amphipod genus Grandidierella Coutière, 1904 were collected from coastal areas of the Ryukyu Archipelago in Japan. Four species are new to science and the other two are new to Japan. Grandidierella contigua sp. nov. has... more
Six species of the amphipod genus Grandidierella Coutière, 1904 were collected from coastal areas of the Ryukyu Archipelago in Japan. Four species are new to science and the other two are new to Japan. Grandidierella contigua sp. nov. has a characteristic male gnathopod 1 with three teeth on the carpus, the proximal tooth of which is very small and contiguous with the large middle tooth. Grandidierella gilesi Chilton, 1921 is characterized by the densely setose gnathopods and the divergent merus of the gnathopod 2 in both sexes. Grandidierella halophila Wongkamhaeng, Pholpunthin & Azman, 2012 possesses a long posteromedial projection on the male coxa 2. Grandidierella japonicoides sp. nov. closely resembles G. japonica Stephensen, 1938 in having stridulating ridges on the male gnathopod 1 carpus, but the former can be distinguished from the latter in the presence of a posteromedial projection on the male coxa 2 and the shapes of the gnathopod 1 carpus in both sexes. Grandidierella n...
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Two species of Maera Leach, 1814, a species of Meximaera Barnard, 1969 and a species of Orientomaera Ariyama, 2018 included in the Maera clade, are described from Japan. Maera loveni (Bruzelius, 1859) was collected from the Sea of Japan... more
Two species of Maera Leach, 1814, a species of Meximaera Barnard, 1969 and a species of Orientomaera Ariyama, 2018 included in the Maera clade, are described from Japan. Maera loveni (Bruzelius, 1859) was collected from the Sea of Japan and can be distinguished from its congeners by the very large body size and the gnathopod 2 palm defined by a blunt tooth bearing a strong robust seta. Maera sagamiensis sp. nov. from Sagami Bay is characterized by the presence of small notches on the coxae 1–3. Meximaera mooreana (Myers, 1989) was collected from Wakayama Prefecture and has two distinct characters: the male gnathopod 2 with wide basis and the very long uropod 3. Morphological characters of the Japanese specimens resemble well those in the literature, but the mandibular palp article 1 is projected acutely. Orientomaera incisa sp. nov. was recently collected from Wakayama Prefecture and its gnathopods 2 in both sexes bear a distinctive incision on the palm. Keys to species of Meximaera...
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Two species of the amphipod genus Ceradocus Costa, 1853 were collected from coastal areas in Japan: C. kiiensis sp. nov. from Wakayama Prefecture and C. laevis Oleröd, 1970 from Okinawa Prefecture. Both of the species share the... more
Two species of the amphipod genus Ceradocus Costa, 1853 were collected from coastal areas in Japan: C. kiiensis sp. nov. from Wakayama Prefecture and C. laevis Oleröd, 1970 from Okinawa Prefecture. Both of the species share the asymmetrical male gnathopod 2, the larger male gnathopod 2 with strongly oblique palm and the uropod 3 with wide rami. Ceradocus kiiensis also has the palm with a single excavation in the larger male gnathopod 2 and the pleonites 1–3 with many dorsal teeth. This new species can be distinguished from its congeners by the absence of the anterodistal projection on the basis of the larger male gnathopod 2, the presence of the posterior teeth on the pleonal epimera 1–2, and others. Ceradocus laevis is characterized by the palm having triangular and small trapezoidal projections in the larger male gnathopod 2, the pereopods 5–7 bases with rounded posterodistal lobe, the pleonites and urosomites lacking dorsal teeth, and the pleonal epimera 1–2 without posterior tee...
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Four species of the genus Seba Bate, 1862 were collected from coastal areas in western Japan. Among them, two species were revealed to be new to science. Species collected are Seba chiltoni Moore, 1987, S. ekepuu J.L. Barnard, 1970, S.... more
Four species of the genus Seba Bate, 1862 were collected from coastal areas in western Japan. Among them, two species were revealed to be new to science. Species collected are Seba chiltoni Moore, 1987, S. ekepuu J.L. Barnard, 1970, S. latiquinta sp. nov., and S. latisexta sp. nov. All of them are described in both sexes, and keys to species of Seba in Japan are provided. Each species is distinguishable from one another by the shapes of gnathopods, pereopods 5–7 and uropods 1 and 2. The genus Caribseba Shaw, 1989 is synonymized with Seba.
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Two new species of the amphipod genus Leipsuropus Stebbing, 1899 are described. Leipsuropus astericolus sp. nov.was collected from the surface of a starfish in Japanese waters and L. hongi sp. nov. from the bottom in Korean waters.Both... more
Two new species of the amphipod genus Leipsuropus Stebbing, 1899 are described. Leipsuropus astericolus sp. nov.was collected from the surface of a starfish in Japanese waters and L. hongi sp. nov. from the bottom in Korean waters.Both species have distinct projections on dorsal and lateral surfaces of head, pereonites 1–7 and pleonites 1, 2, and theprojections were acute in L. astericolus and blunt in L. hongi. These new species are quite different from L. parasiticus(Haswell, 1879) in Australian waters which has only dorsal rugae on pereonites 1–5. They are also distinguishable fromL. sinensis Ren, 2012 in Chinese waters in their sinuate palms of the male gnathopod 2. A key to species of the genus is provided.
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One species of Austromaera Lowry & Springthorpe, 2005 and four species of Quadrimaera Krapp-Schickel & Ruffo, 2000 included in the Maera clade, are described from Japan. Austromaera ariakensis sp. nov. is described, based on collections... more
One species of Austromaera Lowry & Springthorpe, 2005 and four species of Quadrimaera Krapp-Schickel & Ruffo, 2000 included in the Maera clade, are described from Japan. Austromaera ariakensis sp. nov. is described, based on collections from Ariake Sea and can be distinguished from its congeners by the acutely produced coxa 1 and the merus of gnathopod 2 with a small posterodistal spine. Quadrimaera gotoensis sp. nov. from Goto Islands in Nagasaki Prefecture has a small quadrate excavation on the middle palmar margin of the male gnathopod 2. This new species is different from Q. mirandella Appadoo, Myers & Fagoonee, 2002 having such an excavation, in the larger posterodistal tooth of the male gnathopod 2 propodus and the wider bases of the pereopods 5–7. Quadrimaera pacifica (Schellenberg, 1938) was collected from many localities from Iwate Prefecture to Ariake Sea. This species is characterized by the transverse palm of the male gnathopod 2 with the large posterodistal tooth, the s...
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Two new species of the genus Kamaka Dershavin, 1923 (Crustacea: Amphipoda: Kamakidae) are described from Songkhla Lagoon in southern Thailand. Kamaka appendiculata sp. nov. has unique lamellate appendix on peduncle of antenna 2 in adult... more
Two new species of the genus Kamaka Dershavin, 1923 (Crustacea: Amphipoda: Kamakidae) are described from Songkhla Lagoon in southern Thailand. Kamaka appendiculata sp. nov. has unique lamellate appendix on peduncle of antenna 2 in adult male. Kamaka songkhlaensis sp. nov. has swelled peduncular article 4 of antenna 2 and wide propodus of gnathopod 2 in adult male. Morphological characters of K. songkhlaensis closely resemble those of K. poppi Bamber, 2003 from Hong Kong and K. taditadi Thomas & Barnard, 1991 from Papua New Guinea, Indonesia and Malaysia; however, K. songkhlaensis can be distinguished from K. poppi by the peduncular article 4 of male antenna 2 without distal spine and the convex distal margin of propodus of male gnathopod 2, and from K. taditadi in the right-angled posteroventral corner of male coxa 1 and the propodus of male gnathopod 2 without blunt triangular process on anterior margin.
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Three new species of the Eriopisa group (Crustacea: Amphipoda: Eriopisidae) are described from coastal areas in Japan. Paraflagitopisa gen. nov. is established with P. excavata sp. nov. as its type species. This new genus is characterized... more
Three new species of the Eriopisa group (Crustacea: Amphipoda: Eriopisidae) are described from coastal areas in Japan. Paraflagitopisa gen. nov. is established with P. excavata sp. nov. as its type species. This new genus is characterized by (1) entire lateral cephalic lobe, (2) unfused flagellum of antenna 2, (3) 3-articulated mandibular palp, (4) carpus of gnathopod 1 longer than propodus, (5) transverse palm of gnathopod 1, and (6) slender outer ramus of uropod 3 with long second article, and can be distinguished from the closely related genus, Flagitopisa, by the article 2 of mandibular palp longer than article 3, the undilated bases of pereopods 3-4, and the slender inner ramus of uropod 3. Psammogammarus lobatus sp. nov. is characterized by (1) male gnathopod 2 with excavated palm, (2) posterodistally projected bases of pereopods 5-7, (3) quadrate posteroventral corner of pleonal epimeron 3, (4) short inner ramus of uropod 3, and (5) article 2 of uropod 3 outer ramus longer th...