Chatan, Japan
Chatan, Japan

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Clark P.F.,Natural History Museum in London | Fujita Y.,University of Ryukyus | Fujita Y.,Marine Learning Center | Ball A.D.,Natural History Museum in London | Ng P.K.L.,National University of Singapore
Zootaxa | Year: 2012

Traditionally, Crossotonotus spinipes (De Man, 1888) and Pseudopalicus serripes (Alcock & Anderson, 1895) were assigned to the Crossotonotinae Moosa & Serène, 1981, and Palicinae Bouvier, 1898, respectively. However, Ng et al. (2008:127) listed a number of major adult characters that suggested both subfamilies should be recognised as distinct families within the Palicoidea Bouvier, 1898 (see also Castro 2010, 2011; Guinot et al. in prep.). Recently, ovigerous specimens of C. spinipes and P. serripes were collected from Okinawajima and Kumejima, central Ryukyu Islands, Japan. The first zoeal stages of both species were hatched in the laboratory, dissected, examined, and the appendages illustrated and described. Crossotonotus spinipes first stage zoeas were distinguished by three characters: the absence of lateral carapace spines (present in P. serripes), abdominal somite 4 with a pair of dorsolateral processes directed ventrally (absent in P. serripes) and the presence of a small lateral spine on the telson (absent in P. serripes). These distinguishing features appear to support the recent division of the Palicoidea into two families. Copyright © 2012. Magnolia Press.

De Grave S.,University of Oxford | Chan T.-Y.,National Taiwan Ocean University | Fujita Y.,University of Ryukyus | Fujita Y.,Marine Learning Center | Okuno J.,Natural History Museum and Institute
Zootaxa | Year: 2012

The present report deals with caridean shrimps from the families Hippolytidae (7 species) and Barbouriidae (1 species) collected during the KUMEJIMA 2009 expedition in the Ryukyu Islands. The deep-water hippolytid Gelastreutes crosnieri Bruce, 1990 is recorded from Kumejima based on a single female specimen, representing a considerable range extension of this species from New Caledonia to Japan. The opportunity is also taken to record and illustrate the first known male specimen of G. crosnieri, collected during the SANTO 2006 expedition off West Mavéa Island, Vanuatu. The colour pattern of G. crosnieri is shown for the first time. The Kumejima and Vanuatu specimens present noticeable differences in both morphology and colouration, but appear to be conspecific based on comparison of the barcoding gene COI sequences. The recently described Lysmata lipkei Okuno & Fielder, 2010 is recorded for the second time, however, not representing a significant range extension of this species. The other species reported are Saron marmoratus (Olivier, 1811), Saron neglectus De Man, 1902, Thinora maldivensis (Borradaile, 1915), Thor amboinensis (De Man, 1888), Tozeuma armatum Paul'son, 1875 (Hippolytidae), and Parhippolyte misticia (Clark, 1989) (Barbouriidae). Copyright © 2012. Magnolia Press.

Komai T.,Natural History Museum and Institute | Fujita Y.,University of Ryukyus | Fujita Y.,Marine Learning Center
Zootaxa | Year: 2014

Three species of the processid shrimp genus Processa Leach, 1815, including two new species, are reported from shallow coastal waters in Okinawa Island, Ryukyu Islands, Japan: P. affinis Hayashi, 1975, P. filipes n. sp. and P. hayashii n. sp. The present specimens of P. affinis represent the rediscovery and range extension of this poorly known species, originally described from Indonesia. Male characteristics of P. affinis are documented for the first time. The two new species are referred to the P. aequimana Paulson, 1875 species group. Processa filipes n. sp. is characteristic in the greatly elongate fifth pereopod and the transverse ridge on thoracic sternite 8 consisting of soft cuticle. Processa hayashii n. sp. is charac-terized by the presence of a deep concavity on the anterolateral margin of the carapace just inferior to the antennal tooth. The number of species of Processa known from Japanese waters is raised from five to eight. Copyright © 2014 Magnolia Press.

Komai T.,Natural History Museum and Institute | Fujita Y.,University of Ryukyus | Fujita Y.,Marine Learning Center | Maenosono T.,Kankyosha
Zootaxa | Year: 2014

Two species referred to the callianassid ghost shrimp genus Rayllianassa Komai & Tachikawa, 2008 are reported here-with. Additional locality records from Japan are provided for R. amboinensis (de Man, 1888), and the synonymy of Calli mass a ngochoae Sakai, 1999 with R. amboinensis is discussed. It is shown that R. amboinensis is associated with sponges or alcyonacean soft corals, representing unusual habitats for callianassids. Rayllianassa rudisulcus n. sp. is described on the basis of a single ovigerous female from shallow soft sediment in Ohura Bay, Okinawa Island, Ryukyu Islands. The new species is distinguished from R. amboinensis by the absence of a dorsal oval on the carapace, the antennal peduncle being longer than the antennular peduncle, and the different shape of the third maxilliped. The status of Rayllianassa is also briefly discussed. Copyright © 2014 Magnolia Press.

Anthessius isamusi n. sp. is described based on female and male specimens from a turbinid gastropod, Turbo marmoratus Linnaeus, collected in the East China Sea off Kumejima Island, the Ryukyu Islands, southern Japan, during the KUMEJIMA 2009 Expedition. The female of the new species is differentiated from its congeners by the following combination of characters: 1) the absence of denticles on the ventral surface of the anal somite; 2) the length to width ratio of the caudal ramus; 3) the antenna bearing 4 claws; 4) the maxilla with 3 distal teeth; 5) the exopod of leg 4 with 3 spines on the terminal segment, and; 6) leg 5 with a rod-like terminal segment. Copyright © 2012. Magnolia Press.

Two new species of Hatschekia Poche, 1902 (Siphonostomatoida: Hatschekiidae) are described based on specimens collected during the KUMEJIMA 2009 Expedition carried out at Kumejima Island, Ryukyu Islands, an area getting strong Kuroshio current influence in the East China Sea, Japan. Female Hatscekia triannuli n. sp. and female and male H. sumireyakko n. sp. were removed from Centropyge heraldi Woods & Schultz and C. venusta (Yasuda & Tominaga), respectively. The two new species shares a unique dorsal frame on the cephalothorax that is absent on other congeners. These two species can be differentiated from each other by the shape and proportion of the cephalothorax, trunk, and leg 2. Copyright © 2012. Magnolia Press.

Fujita Y.,University of Ryukyus | Fujita Y.,Marine Learning Center | Naruse T.,University of Ryukyus
Zootaxa | Year: 2011

A new species of swimming crab belonging to the genus Catoptrus A. Milne-Edwards, 1870, is described based on a single female specimen collected from a submarine cave at Ie Island, Ryukyu Islands, Japan. The new species can be easily distinguished from all five congeners by its proportionally longer pereopods as well as by combinations of the characters of the carapace, eyes, and cheliped. Copyright © 2011 · Magnolia Press.

Fujita Y.,University of Ryukyus | Fujita Y.,Marine Learning Center | Obuchi M.,Biological Institute on Kuroshio
Zootaxa | Year: 2012

A new species of the genus Comanthus A.H. Clark, 1908, is described on the basis of specimens collected from Kume Island and Okinawa Island, the Ryukyu Islands, Japan. Comanthus kumi n. sp. is distinguished from all ten congeners by having extremely elongate arms exceeding 300 mm in length and the colouration in life. The new species concealed its whole body in a crevice or small hole on coral reefs during the day and protruded only several elongate arms on the reef surface at night. This habit suggests that the new species is nocturnal. Copyright © 2012. Magnolia Press.

Weese D.A.,Auburn University | Fujita Y.,University of Ryukyus | Fujita Y.,Marine Learning Center | Santos S.R.,Auburn University
Biological Bulletin | Year: 2013

Archipelagos of the Indo-West Pacific are considered to be among the richest in the world in biodiversity, and phylogeographic studies generally support either the center of origin or the center of accumulation hypothesis to explain this pattern. To differentiate between these competing hypotheses for organisms from the Indo-West Pacific anchialine ecosystem, defined as coastal bodies of mixohaline water fluctuating with the tides but having no direct oceanic connections, we investigated the genetic variation, population structure, and evolutionary history of three caridean shrimp species (Antecaridina lauensis, Halocaridinides trigonophthalma, and Metabetaeus minutus) in the Ryukyu Archipelago, Japan. We used two mitochondrial genes-cytochrome c oxidase subunit I (COI) and large ribosomal subunit (16S-rDNA)- complemented with ge-netic examination of available specimens from the same or closely related species from the Indian and Pacific Oceans. In the Ryukyus, each species encompassed 2-3 divergent (9.52%-19.2% COI p-distance) lineages, each having significant population structure and varying geographic distributions. Phylogenetically, the A. lauensis and M. minutus lineages in the Ryukyus were more closely related to ones from outside the archipelago than to one another. These results, when interpreted in the context of Pacific oceanographic currents and geologic history of the Ryukyus, imply multiple colonizations of the archipelago by the three species, consistent with the center of accumulation hypothesis. While this study contributes toward understanding the biodiversity, ecology, and evolution of organisms in the Ryukyus and the Indo-West Pacific, it also has potential utility in establishing conservation strategies for anchialine fauna of the Pacific Basin in general. © 2013 Marine Biological Laboratory.

Havird J.C.,Auburn University | Vaught R.C.,Auburn University | Weeks J.R.,Auburn University | Fujita Y.,University of Ryukyus | And 4 more authors.
Comparative Biochemistry and Physiology -Part A : Molecular and Integrative Physiology | Year: 2014

Crustaceans generally act as oxy-regulators, maintaining constant oxygen uptake as oxygen partial pressures decrease, but when a critical low level is reached, ventilation and aerobic metabolism shut down. Cave-adapted animals, including crustaceans, often show a reduced metabolic rate possibly owing in part to the hypoxic nature of such environments. However, metabolic rates have not been thoroughly explored in crustaceans from anchialine habitats (coastal ponds and caves), which can experience variable oxygenic regimes. Here, an atypical oxy-conforming pattern of oxygen uptake is reported in the Hawaiian anchialine atyid Halocaridina rubra, along with other unusual metabolic characteristics. Ventilatory rates are near-maximal in normoxia and did not increase appreciably as PO2 declined, resulting in a decline in VO2 during progressive hypoxia. Halocaridina rubra maintained in anoxic waters survived for seven days (the duration of the experiment) with no measureable oxygen uptake, suggesting a reliance on anaerobic metabolism. Supporting this, lactate dehydrogenase activity was high, even in normoxia, and oxygen debts were quickly repaid by an unusually extreme increase in oxygen uptake upon exposure to normoxia. In contrast, four related anchialine shrimp species from the Ryukyu Islands, Japan, exhibited physiological properties consistent with previously studied crustaceans. The unusual respiratory patterns found in H. rubra are discussed in the context of a trade-off in gill morphology for osmoregulatory ion transport vs. diffusion of respiratory gasses. Future focus on anchialine species may offer novel insight into the diversity of metabolic responses to hypoxia and other physiological challenges experienced by crustaceans. © 2014.

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