Author
Shigeyuki Yamato
Bio: Shigeyuki Yamato is an academic researcher. The author has contributed to research in topics: Genus & Brackish water. The author has an hindex of 4, co-authored 6 publications receiving 49 citations.
Topics: Genus, Brackish water, Holotype, Spiny lobster, Loggerhead sea turtle
Papers
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TL;DR: Two species of the genus Melita, Melita setijlagella n. sp. and Melita shimizui (Ueno, 1940), are described from brackish waters in Japan as discussed by the authors.
Abstract: Two species of the genus Melita, Melita setijlagella n. sp. and Melita shimizui (Ueno, 1940), are described from brackish waters in Japan. The former species is distinct in bearing the markedly setose flagellum of antenna 2. The latter has not so far been known from the Japanese waters, and shows variations in some characters, which distinguish the Japanese materials into three morphological \"forms\". Both species are also discernible from the other species of the genus Melita by the shape of male gnathopod 1 and female coxa 6. The present paper is the second of the senes treating the Japanese melitid amphipods. The previous report dealt with four intertidal species (Yamato, 1987), and this deals with two species from brackish waters, a new species and A1elita shimizui (Ueno, 1940a). Both species are very common in estuaries in Japan and often occur sympatrically. Melita shimizui was originally described as Crangonyx shimizui from two springs on the Liaotung Peninsula of the northeast China (U eno, 1940a, b). Later, Karaman (1981) moved this species to Melita, based upon Ueno's description. This is the first record of this species from Japan. Materials used in this report were obtained from the following localities (Fig. 1). Fujii-gawa (34° 26'N, 133° 15'E): the mouth of the Fujii-gawa River, Onomichi. Nuta-gawa (34° 23'N, 133° 02'E): around Shinkura-bashi Bridge of the Nuta-gawa River, Mihara. Ohta-gawa (34° 24'N, 132° 21 'E): around Yamate-bashi Bridge of the Ohta-gawa River, Hiroshima. Ochiai-gawa (34° 19'N, 135° OS'E): the mouth of the Ochiai-gawa River, near Osaka Prefectural Fisheries Experimental Station, Misaki, Osaka Prefecture, collected by Mr. H. Ariyama. Sozu-gawa (32° 57'N, 132° 33'E): the mouth of the Sozu-gawa River, Mishou, Ehime Prefecture. Shioiri-hama (32° 32'N, 130° 02'E): Shioiri-hama estuary, near the Amakusa Marine Biological Laboratory, collected by Mr. S. Nishihama and Dr. C. Aryuthaka. Nakijin (26° 42'N, 127° 57'E): a concrete ditch poured from a freshwater spring, Shoshi, Nakijin, the Island of Okinawa, collected by Dr. N. Broodbakker. Hinuma (36° 17'N, 140° 29'E): Lake Hinuma, Ibaraki Prefecture, collected by Dr. H. Morino. Garno (38° 15'N, 14P OO'E): Garno estuary, Miyagi Prefecture, collected by Mr. M. Kyouno. The figures of each appendage are depicted from two specimens, which are the holotype and the allotype, or one male and female; the figures from subsidiary specimens are denoted by the numerals within parentheses. Specimens used for figures are numbered, like male (1). Type specimens will be deposited in the National Science Museum, Tokyo, after the study is accomplished. 1) Contribution from the Mukaishima Marine Biological Station, No. 288. Publ. Seto Mar. Biol. Lab., 33(1/3), 79~95, 1988. (Article 4)
17 citations
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16 citations
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TL;DR: The two new species markedly differ from other species of Melita previously reported from the same region in the morphology of the male gnathopod 1 and the female coxa 6, and the biarticulate uropod 3 which will be discussed from a taxonomic point of view.
Abstract: Two new species of gammaridean amphipods of the genus Melita, M. hoshinoi and M. quadridentata, are described from shallow waters of the Seto Inland Sea of Japan. Melita hoshinoi is unique within the genus in having two basofacial spines on the peduncle of uropod 1. Melita quadri dentata is characterized by markedly setose pereopods 6-7 and uropod 3. The two new species are clearly distinguishable from other congeners also by the shapes of male gnathopod 1 and female coxa 6. A biarticulate outer ramus of the uropod 3, which is usually regarded as an important characteristic of the genus Abludomelita (sensu Karaman, 1981) that distinguishes it from the genus Melita, is rec ognized in the two new species. The present paper deals with two new species of the genus Melita Leach (Gam maridea, Melitidae) from the Seto Inland Sea of Japan. Although the materials of these two new species used for the present study were obtained only from a small area around the Mukaishima Marine Biological Station, they are not rare species. Actually they are very abundant there and have repeatedly been collected. The two new species markedly differ from other species of Melita previously reported from the same region (Yamato, 1987, 1988) in the morphology of the male gnathopod 1 and the female coxa 6, and the biarticulate uropod 3 which will be discussed from a taxonomic point of view. The new species seem to differ from the previously report ed species also in the habitat because they have so far been found in subtidal sedi ments, while the latter species are known to occur in intertidal and brackish-water areas. The figures of appendages are depicted from two specimens, which are the holotype and the allotype. The figures from subsidiary specimens are denoted after the dash, like "m2" and "f2". Type specimens will be deposited in the National Science Museum, Tokyo, after the completion of this study. Abbreviations used in the figures. R., right; L., left; A, antenna; CX, coxa; E, epimeral plate; G, gnathopod; H, head; IP, inner plate; LL, lower lip; MD, mandible; MX, maxilla; MXP, maxil liped; OP, outer plate; PL, pleopod; PLS, pleosomite; PR, pereopod; T, telson; U, uropod; UL, upper lip; URS, urosomite; f, female; i, inner surface; o, outer surface.
10 citations
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7 citations
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TL;DR: A new amphipod crustacean, Melita shiodamari, is described from a high tide rock pool at Shirahama, on the west coast of the Kii Peninsula in Japan, and is very different from many Melita species, but resembles M. plumulosa Zeidler, 1989, M. awa Barnard and M. matilda Barnard, 1972a from the Southern Hemisphere.
Abstract: A new amphipod crustacean, Melita shiodamari, is described from a high tide rock pool at Shirahama, on the west coast of the Kii Peninsula in Japan. The new species is very different from many Melita species, but resembles M. plumulosa Zeidler, 1989, M. awa Barnard, 1972b and M. matilda Barnard, 1972a from the Southern Hemisphere in the general morphology, and especially in the peculiar morphology of the gnathopods 1 and 2. Tegano seticornis (Bousfield, 1970), Sriha vagabunda (Karaman, 1984) and Fiha schminkei Stock, 1988 are also similar to the new species, and should be transferred to the genus A1elita. All of these species possibly constitute a subgroup, awa-complex, of the genus Melita. Taxonomy of other related genera from the Indo-Pacific, most of which are monotypic, are also considered. The relationship and evolution of these allied species and genera are briefly discussed.
5 citations
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TL;DR: Fungal and bacterial pathogens present significant threats for rearing spiny lobsters in aquaculture settings, but only one pathogen, Panulirus argus virus 1, is thought to have damaged a fishery for a spiny lobster.
80 citations
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TL;DR: Theory that the existence of many empty niches in north-western Europeanbrackish waters make this environment particularly susceptible to invasions ofalien species is corroborated and the application of hard substrates in a region originally predominated by soft bottoms moreover facilitates the introduction ofexotic species.
Abstract: The American amphipod species Melita nitida andIncisocalliope aestuarius have been found in the WesternScheldt estuary (the Netherlands). This is the first record of these species inthe north-east Atlantic. Shipping is the most likely vector of introduction.Thedistribution of both species is investigated and compared with the distributionand the microhabitat of co-occurring amphipod species. Melitanitida is known from both the east and west coast of North Americaand I. aestuarius originates from the east coast of NorthAmerica. Until now neither has been reported from other parts of the world. Inthe Netherlands both species are restricted to the mesohaline part of theWestern Scheldt. Melita nitida occurs predominantly underPacific oysters at the underside of boulders, mainly sublittorally.Incisocalliope aestuarius is associated to hydrozoans.Bothmicrohabitats are hardly utilized by other amphipod species. Therefore, thetheory that the existence of many empty niches in north-western Europeanbrackish waters make this environment particularly susceptible to invasions ofalien species is corroborated. The application of hard substrates in a regionoriginally predominated by soft bottoms moreover facilitates the introductionofexotic species. The species community on hard substrates in the mesohaline partof the Western Scheldt contains a high proportion of introduced species:approximately one third of the macrofauna species is of allochthonous origin.
31 citations
01 Jan 2000
TL;DR: Much work needs to be done in the South China Sea before amphipod biodiversity can be properly assessed and understood, in nearly all recorded families the genera and species appear to be poorly represented.
Abstract: The Amphipoda of the South China Sea are catalogued. Based on the literature, 48 families, 113 genera and 272 species are recorded. Gammaridean amphipods have effectively been studied from only three areas - Hong Kong, several sites in Vietnam and several sites in the Philippines. There are additional small study sites in Singapore and the Spratly Islands. Based on these studies 31 gammaridean families, 67 genera and 153 species have been recorded, the vast majority of these taxa come from the Central-western and North-western South China Sea. In nearly all recorded families the genera and species appear to be poorly represented. By comparison Ruffo (1982; 1989; 1993) has reported 51 families, 157 genera and 450 species of gammaridean and caprellidean amphipods from the Mediterranean Sea. Important habitats for amphipods such as algal forests, seagrass meadows and coral reefs have not been studied in the South China Sea. No caprellidean or ingolfiellidean amllhipods have been reported. Hyperiidean amphipods appear to be more widely collected and studied (17 hyperiidean families, 46 genera and 119 species). More than half of all hyperiidean families have been reported from this area. Much work needs to be done in the South China Sea before amphipod biodiversity can be properly assessed and understood.
25 citations
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TL;DR: This paper presents an overview of the known associations between amphipods and other crustaceans, and focuses on groups 2-4, which are quite common and widely distributed among the different amphipod clades.
Abstract: This paper presents an overview of the known associations between amphipods and other crustaceans. Such associations are quite common and widely distributed among the different amphipod clades, and in most cases show a high degree of host specialisation. They can roughly be divided into 5 groups: 1) living among the epifauna of large Crustacea, 2) living directly on the surface or appendages of their crustacean hosts, 3) living among the eggs of their crustacean hosts, 4) living in the permanent burrows of infaunal crustaceans, and 5) living on or in gastropod shells tenanted by hermit crabs. This survey concentrates on groups 2-4.
14 citations
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TL;DR: Its most striking characters are: absence of any pleonal or urosomal dorsal teeth, elongated distal article of the mandibular palp, hind margin of last pereopod bases strongly narrowed distad, and epimera posterodistally rectangular.
Abstract: Described is Melita mirzajanii n. sp. (Melitidae) from the southwestern corner of the Caspian Sea. It shows no particular similarity to any species known from the Mediterranean Sea. It inhabits, as the only amphipod species, dense growths of Amphibalanus cf. improvisus (Darwin 1854) in a port, at low and highly fluctuating salinities. Its most striking characters are: absence of any pleonal or urosomal dorsal teeth (projections), elongated distal article of the mandibular palp, hind margin of last pereopod bases strongly narrowed distad, and epimera posterodistally rectangular. An identification key for the species group of Melita without dorsal teeth and without article 2 on the exopodite of the third uropod is provided.
12 citations