ABSTRACT
The present study deals with a collection of deep-sea shrimp of the pandalid genus Pandalopsis Spence Bate, 1888 from the Nemuro Strait, Hokkaido, southwestern part of the Sea of Okhotsk. Three new species are described and illustrated: Pandalopsis capillus n. sp., P. houyuu n. sp. and P. princeps n. sp. In addition, Pandalopsis glabra Kobjakova, 1936, a species endemic to the Sea of Okhotsk, is supplementary reported. Most specimens were collected from steep slopes or hard bottoms at depths greater than 400 m by commercial shrimp trap or gill nets operated by local fishermen. Differentiation of the new species is primarily based on a morphological comparison, supplemented by a preliminary genetic analysis of partial segments of the mitochondrial 16S rRNA gene. An identification key to the species of Pandalopsis is presented.
Subject(s)
Pandalidae , RNA, Ribosomal, 16S , Animal Distribution , Animals , Decapoda , Genes, Mitochondrial , Pandalidae/geneticsABSTRACT
A poorly known thorid shrimp, Lebbeus longidactylus (Kobjakova, 1936), is redescribed on the basis of material collected from the Nemuro Strait, southwestern part of the Sea of Okhotsk, at depths of 600-800 m. The newly collected samples represent the second finding of this rarely collected species since the type description. The species belongs to the informal species group characterized by the possession of epipods on maxilliped 3 to pereopod 2, and appears close to L. scrippsi Wicksten & Méndez, 1982, known from the eastern Pacific, in that the slender dactyli of pereopods 3-5 each terminate in a simple, non-biunguiculate tip and by having accessory spiniform setae restricted to the proximal half of the flexor margin. The elongate rostrum with more numerous dorsal spines, more numerous dorsolateral spiniform setae on the telson, and a single spine on the dorsodistal margin of article 1 of the antennular peduncle readily differentiate L. longidactylus from L. scrippsi.
Subject(s)
Decapoda/classification , Animals , Decapoda/anatomy & histology , Female , Male , Pacific OceanABSTRACT
A new species of the caridean shrimp genus Lebbeus White, 1847 (Thoridae), L. fujimotoi n. sp. is described and illustrated on the basis of material from the Nemuro Strait, southwestern part of the Sea of Okhotsk, Hokkaido, Japan, at depths of 500-800 m. The new species belongs in the informal species group characterized by the possession of an epipod only on the third maxilliped, containing only L. elegans Komai, Kohtsuka & Hayashi, 2004 among the 65 previously described specific taxa. The elongate and strongly upturned rostrum with more numerous ventral teeth (seven or eight versus one to four) and the presence of a posteroventral tooth on the fourth pleonal pleuron immediately distinguish the new species from L. elegans. Species of Lebbeus reported from the Sea of Okhotsk are briefly overviewed.
Subject(s)
Decapoda/anatomy & histology , Decapoda/classification , Animals , Female , Japan , Male , Species SpecificityABSTRACT
Pandalopsis spinosior Hanamura, Kohno & Sakaji, 2000 (Decapoda: Caridea: Pandalidae) was originally described on the basis of material collected in the Urup Strait, South Kurile Islands, but there have been no subsequent records of the species since the original description. The Marine Science Museum, Fukushima Prefecture (Aquamarine Fukushima) has carried out investigations on deep-water animals in the Nemuro Strait, off Shiretoko Peninsula, Hokkaido, Japan, amongst the collections a large, commercially important pandalid shrimp routinely identified with P. coccinata Urita, 1941. Examination of the specimens from the collections, however, resulted in an unexpected identification with P. spinosior, instead of P. coccinata. In this short article, diagnostic characters of P. spinosior are reassessed, and comparison with P. coccinata is made. The validity of P. zarenkovi Ivanov & Sokolov, 2001, for which possible synonymy with P. spinosior was suggested, is maintained for the time being.
