Peduncle Of Uropod Research Articles

Kensleylana briani, a new genus and species of freshwater cave-dwelling cirolanid (Crustacea: Isopoda) from Spain

Kensleylana briani, new genus, new species, is described from freshwater in the karst caves of the Miravet Ravine, northern Spain. The monotypic genus is characterised by extreme reduction of the pleon, which has all pleonites fused to the pleotelson, with only one short suture marking the division between the pleon and the pleotelson. The genus and species is further characterised by the uropod peduncle being elongate, round in cross-section, extending to the posterior margin of the pleotelson and terminating in a single short stub-like ramus. The appendage morphology is otherwise similar to that of Faucheria Dollfus & Vire, 1905, a monotypic, freshwater, cave-dwelling genus known only from southern France.

The genus Eudorella (Crustacea: Cumacea) from the Yellow Sea, with description of a new species

Two species of the genus Eudorella (Crustacea: Cumacea) were collected and examined from the Yellow Sea. A new species and one new record of Eudorella are described and illustrated. This new species Eudorella hwanghaensis sp. nov. closely resembles E. intermedia, but it differs from the latter species in bearing a distinct apical spine of endopod with uropod peduncle. The distribution of the new species is confined to the central portion of the Yellow Sea, and its distributional range coincides well with that of the Yellow Sea Bottom Cold Water Mass. Eudorella pacifica is recorded for the first time in Korean waters. It occurred in shallow waters and was distributed widely on both coastal sides of the Yellow Sea.

Haustorius jayneae, a New Species of Haustoriid Amphipod from the Northern Gulf of Mexico, with Notes on Its Ecology at Panama City Beach, Florida U.S.A.

A new species of sand-burrowing amphipod, Haustorius jayneae, is described from the swash zone and shallow subtidal sands along the north Florida and Mississippi Gulf coasts. It is most similar to H. canadensis from the American Atlantic coast, differing primarily in the presence of a distinct anterodistal spinous lobe on pereopod 6, article 5; a longer row of distal marginal spines on pereopod 7, article 4; and fewer proximal spines on the peduncle of uropod 1. A revised key to the known species of Haustorius is included and information on the ecology of H. jayneae n. sp. at Panama City Beach, Florida, is reviewed.

Two New Species of the Genus Melita (Crustacea : Amphipoda) from Shallow Waters of the Seto Inland Sea of Japan

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.

Acanthohaustorius uncinus, a New Species of Sand-Burrowing Amphipod from the Northern Gulf of Mexico, with Notes on its Ecology (Haustoriidae: Haustoriinae)

A new species of sand-burrowing amphipod, Acanthohaustorius uncinus, is described from vegetated and unvcgetated estuarine sands from St. Andrew Bay, Florida and East Ship Island, Mississippi. The genus Acanthohaustorius has been informally recorded from St. Andrew Bay, but this species is now formally descrikd from the Gulf of Mexico. A. uncinus n. sp. is most similar to A. m i l k of the Open American Atlantic coast. It differs from A. miZZsi in the presence of a dorsally directed, hooked spine on the peduncle of uropod 1 and the totally cleft telson lobes. Information on the ecology of A. uncinus n. sp. in St. Andrew Bay is provided, along with a revised key to the known species of Acanthohaustorius and a brief review of haustoriid studies in the Gulf of Mexico.

ARCTIC AMPELISCID AMPHIPODS: THREE NEW SPECIES

ABSTRACT Three new amphipod species in the family Ampeliscidae, Ampelisca erythrorhabdota, Byblis robustus, and Byblis frigidis, are described from the shallow shelf waters of the northern Bering and southern Chukchi seas. Ampelisca erythrorhabdota is most closely related to Ampelisca macrocephala and differs mainly in the color patterns of unpreserved specimens and size at maturity. Byblis frigidis differs from its closest relative, Byblis breviramus, in having longer antennae, spines on both edges of article 6, pereiopod 7, and in lacking the enlarged lateral spine on the end of the peduncle of uropod 1. Byblis robustus differs from other Byblis in having antennae of almost equal length and a distinctly triangular shape of the posterior lobe of pereiopod 7.

New records of Alaskan marine Crustacea, with descriptions of two new gammaridean Amphipoda

Abstract Range extensions of 17 gammaridean amphipods, six isopods, and two decapods are recorded for Alaskan waters. In addition, two new amphipod species, Metopelloides erythrophthalmus and Neohela intermedia are described and illustrated. N. intermedia seems to be an intermediate form between N. monstrosa and N. pacifica. It has a small rostrum and long dactyls on pereopods 2, 6, and 7, characters reminescent of N. pacifica, and it has bulbous eyes, a swelling on the outer ramus of uropod 1 of the males and a distally expanded peduncle of uropod 3, characters in common with N. pacifica. Although Metopelloides erythrophthalmus is superficially similar to Metopella nasuta and Parametopella stelleri in that all three have prominent keels on the dorsal side of article 1 of antenna 1 and on urosome 1, M. erythrophthalmus differs from M. nasuta and P. stelleri not only by the generic characters, but also in the structure of pereopods 1 and 2, coxa 3 and 4, and the armature of the uropods and telson.

日本産魚類に寄生する等脚類に就いて

Nine species of the Cymothoid Isopoda parasitic in the buccal or abdominal cavity of Japanese fishes are described in this report. They are Codonophilus trigonocephalus (Leach), Rhexanella verrucosa (Schi ?? dte & Meinert), Indusa minabensis n. sp., Cymothoa pulchra Lanchester, C. eremita Brünnich, Livoneca sacciger Richardson, L. samariscii u. sp., Irona melanosticta Schi ?? dte & Meinert, and Ichthyoxenus japonensis Richardson, and are parasitic in due order on Caranx (Longirostrum) delicatissimus (Döderlein), Pagrosomus major(Temminck & Schlegel), Chaunax fimbriatus (Hilgendorf), Diodon holacanthus Linné, Aulopus japonicus (Günther), Synaphobranchus pinnatus (Gronow), Samariscus japonicus Kamohara, Hyporhamphus sajori (Temminck & Schlegel), and Acheilognathus sp. All of them except Ichthyoxenus japonensis, which lives in the abdominal cavity, are discovered from the buccal or branchial cavity of the host. Cymothoa pulchra is recorded for the first time from Japan. The two new species are defined as follows: Indusa minabensis n. sp.: Female 23mm×13mm, nearly symmetrical and highly convex above. Head triangular, with distinct eyes. Antennae comparatively long and slender; those of the lst pair contiguous at the base, 8-jointed, and the 2nd pair longer being composed of 11-12 joints. Thorax oval in outline; antero-lateral angle of the lst segment not produced, but angular. Lateral parts of all thoracic segments slightly expanded having round post-lateral angle. Epimerae in the 2nd to 7th segments, narrow and linear. Basis of pereiopoda without carina. Abdomen one third as long as body; anterior segments covered by the 7th thoracic segment in lateral regions. Pleotelson more or less circular. Peduncle of uropod somewhat acuminate at inner distal angle; exopodite longer than endopodite. Male 10.5mm×5.0mm, relatively narrower than the female, symmetrical and slightly convex above. Head triangular, with distinct eyes. Both pairs of antennae comparatively longer than in the female, but composed of the same number of joints. Thorax oblong, with narrow epimerae. The lst abdominal segment not covered by the thorax. Pleotelson with margin round but more or less notched. Livoneca samariscii n. sp.: Represented only by a female. 10.1mm×5.9mm. Body only slightly convex above, asymmetrical having one side more expanded than the other, and with mar-supium vaulted but empty. Head triangular, very little immersed in the thorax, and with dis-tinct eyes. Antennae slender and long; those of the lst pair separated at the base, 8-jointed; the 2nd pair longer and 10-jointed. The lst thoracic segment sinuated in front, having anteriorly curved lateral parts and with angular antero-lateral corner. Other segments directed more or less obliquely backwards in lateral region and with anteriorly arched posterior borders. Epi-merae very narrow, linear, and shorter than lateral margins of segments. Pereiopoda without ca-rina on the basis. Abdomen nearly one third as long as body. The first 5 segments curved anteri-orly; lateral parts of anterior segments covered by the thorax on one side. Pleotelson semicircu-lar, two thirds as long as wide. Basis of uropod angular at inner distal corner; exopodite longer than endopodite. Lamellar maxilliped has anterior margin bearing a few short plumose setae and a palp tipped by 2 hooks.