Natural History Museum and Institute

Chiba, Japan

Natural History Museum and Institute

Chiba, Japan

Time filter

Source Type

Komai T.,Natural History Museum and Institute | Rahayu D.L.,Indonesian Institute of Sciences
Raffles Bulletin of Zoology | Year: 2013

Ten species of the pagurid genus Catapaguroides A. Milne-Edwards & Bouvier, 1892, including eight new to science, are reported from the Bohol Sea, the Philippines, collected by the PANGLAO 2004 Marine Biodiversity Project: C. brevidactylus, new species; C. conicus, new species; C. crassimanus, new species; C. cristimanus de Saint Laurent, 1968; C. hirsutus, new species; C. karubar McLaughlin, 1997; C. levigatus, new species; C. pusillus, new species; C. tenuiclavus, new species; and C. tuber, new species. The sample is rather small, but specimens came from diverse habitats, including coral reefs, underwater caves, and lower sublittoral soft bottoms. This study is the first report of the genus from the Philippines. Affinities of the eight new species are discussed. Supplemental descriptions and illustrations are also given for C. cristimanus and C. karubar. A list and identification key of all known species of the genus are provided. © National University of Singapore.


Komai T.,Natural History Museum and Institute | Rahayu D.L.,Indonesian Institute of Sciences
Raffles Bulletin of Zoology | Year: 2013

The pagurid hermit crab genus Pagurixus Melin, 1939, is widely distributed in shallow waters in tropical to warm temperate seas in the Indo-West to Central Pacific. This study deals with a collection made during the PANGLAO 2004 Marine Biodiversity Project. Nine species of the genus were identified, including one new to science: P. concolor Komai & Osawa, 2006, P. formosus Komai, 2010, P. haigae Komai & Osawa, 2007, P. longipes Osawa, Fujita & Okuno, 2006, P. maorus (Nobili, 1906), P. nomurai Komai & Asakura, 1995, P. ruber Komai & Osawa, 2006, P. rubrovittatus Komai, 2010, and P. spiniferore, new species. Of these, all but P. haigae are recorded from the Philippines for the first time, clearly suggesting that the inventory of the shallow coral reef fauna in the area is far from satisfactory. The new species, P. spiniferore, belongs to the P. anceps (Forest, 1954) species group, and is immediately distinguished from all other members of the group by the palm of the right cheliped in the male armed with a row of small spines or spiniform tubercles on each dorsolateral and dorsomesial margin and the presence of spines on the dorsodistal margin of the carpus of the right cheliped. © National University of Singapore.


Discovery of an undescribed species of axiid shrimp from French Polynesia, Southwest Pacific, led the author to assess the taxonomic status of the two nominal genera, Manaxius Kensley, 2003 and Calaxidium Sakai, 2014. As a result, these two genera are synonymized under Calaxius Sakai & de Saint Laurent, 1989, because there are no significant differences in generic characters among the three taxa. An emended generic diagnosis of Calaxius is presented. The new species, Cal- Axius poupini, is morphologically similar to C. euophthalmus (De Man, 1905), C. izuensis Komai, 2011, C. kensleyi Clark, Galil & Poore, 2007, C. mimasensis (Sakai, 1967), C. pailoloensis (Rathbun, 1906) and C. sibogae (De Man, 1925), but the poorly developed armature on the ventral margin of each cheliped merus distinguishes the new species from the other six allied species. Some points of taxonomic confusion relating to Calaxius are clarified. © 2016 Magnolia Press.


The pagurid hermit crab genus Trichopagurus de Saint Laurent, 1968 is currently represented by three shallow water species from the tropical Indo-West Pacific region. In this paper, three species of the genus, including one new species, are reported. Trichopagurus tenuidactylus n. sp. is described on the basis of a single ovigerous female from the Bohol Sea, the Philippines, and compared with two close relatives, T. asper Komai & Poupin, 2012 and T. macrochela Komai & Osawa, 2005. New locality records are provided for T. macrochela (the Philippines) and T. trichophthalmus (Forest, 1954) (Taiwan and Marianas). An identification key to the four species of the genus is presented. Copyright © 2013 Magnolia Press.


A review of species of the crangonid genus Metacrangon Zarenkov, 1965 (Decapoda: Caridea) from the Northwest and tropical Southwest Pacific Ocean is presented. Twenty-one species, including seven new to science, are recognized: M. asiaticus (Kobjakova, 1955) from the Kuril Islands and Komandor Islands; M. bythos n. sp. from Japan; M. clevai n. sp. from the Solomon Islands and Vanuatu; M. cornuta Komai & Komatsu, 2009 from Japan; M. holthuisi Komai, 2010 from Japan; M. karubar n. sp. from Indonesia to Solomon Islands; M. laevis (Yokoya, 1933) from northern Japan and the Russian Far East; M. longirostris (Yokoya, 1933) from Japan; M. miyakei Kim, 2005 from Japan; M. monodon (Birshtein & Vinogradov, 1951) from the North Kuril Islands; M. nipponensis (Yokoya, 1933) from Japan; M. obliqua n. sp. from Japan; M. ochotensis (Kobjakova, 1955) from the South Kuril Islands; M. proxima Kim, 2005 from Japan; M. punctata n. sp. from Indonesia, Solomon Islands and New Caledonia; M. robusta (Kobjakova, 1935) from the Sea of Japan and the Sea of Okhotsk; M. similis Komai, 1997 from Japan; M. sinensis Fujino & Miyake, 1970 from the northern part of the East China Sea; M. trigonorostris (Yokoya, 1933) from Japan; M. tropis n. sp. from Japan; and M. tsugaruensis n. sp. from Japan. These species are classified into two informal species groups. The new species are fully described and illustrated. Some previously known species, for which detailed descriptions along modern standards are deemed necessary, are redescribed. Metacrangon asiaticus is elevated from a subspecies of M. variabilis to full species status. A key to aid in the identification of the western Pacific species is provided. Bathymetrical and geographical distributions of the treated species are summarized. It is strongly suggested that each species is highly localized. The species richness is highest in waters around the Japanese Archipelago (17 of the 41 known species occur in the areas). © 2012 Magnolia Press.


Naomi S.-I.,Natural History Museum and Institute
Journal of Zoological Systematics and Evolutionary Research | Year: 2011

Richard L. Mayden and Kevin de Queiroz have devised and developed 'a hierarchy of species concepts' and 'a unified species concept', respectively. Although their integrated frameworks of species concepts are rather different as to how to integrate the diverse modern concepts of species, the end result is that they are likely to agree on species recognition in nature, because they virtually share the same major components (i.e. evolutionary or lineage concept of species; same way of delimiting species), and have the same important consequences. Both the hierarchical and unified frameworks, however, are interpreted to have shortcoming regarding the way of integrating the modern species concepts. I reformulate these ideas into a framework of species concepts as follows: It treats the idea of species as population-level evolutionary lineages (sensuWiley 1978) as the concept for species category, and it adopts the contingent biological properties of species (e.g. internal reproductive isolation, diagnosability, monophyly) as operational criteria in delimiting species. I also suggest that existing and revised versions of the integrated framework of species concepts all are not new species concepts, but versions of the evolutionary species concept, because they treat the evolutionary (or lineage) species concept as the concept for species category. © 2011 Blackwell Verlag GmbH.


Lavoue S.,University of Tokyo | Miya M.,Natural History Museum and Institute | Nishida M.,University of Tokyo
Molecular Phylogenetics and Evolution | Year: 2010

We investigated the phylogenetic relationships among the major lineages of anchovies (Engraulidae) based on the comparison of mitogenome sequences. Analyses support the Engraulidae's monophyly but its placement remains uncertain. Within the Engraulidae, our results are congruent with the current morphology-based hypothesis in dividing the Engraulidae into two subfamilies: the Coiliinae comprises exclusively Indo-Pacific genera, while the Engraulinae includes the widespread genus Engraulis, the so-called "New World anchovies" group and the two Indo-Pacific genera Encrasicholina and Stolephorus. Amazonsprattus belongs to the subfamily Engraulinae. Our results support at least three independent origins of miniaturization within the Clupeiformes. © 2009 Elsevier Inc. All rights reserved.


Komai T.,Natural History Museum and Institute | Fujiwara Y.,Japan Agency for Marine - Earth Science and Technology
Zootaxa | Year: 2012

This paper reports on two species of callianassid ghost shrimps collected from reducing environments in Japan. Cheramus cavifrons n. sp. is described on the basis of five specimens from an invertebrate community associated with mass sinking of whale carcasses implanted off Cape Nomamisaki, Kagoshima Prefecture, Japan, at depths of 219-254 m. This new species is compared with Cheramus spinophthalmus (Sakai, 1970), Callianassa aqabaensis Dworschak, 2003 and Callianassa acutirostella Sakai, 1988. The generic assignment of the new species is provisional, reflecting the flux state of the taxonomy of the family. Nihonotrypaea thermophila Lin, Komai & Chan, 2007, originally described from hydrothermally influenced field off northeastern Taiwan, is first recorded from outside the type locality, based on a single specimen from hydrothermally influenced field in Kagoshima Bay, where the siboglinid tube worm Lamellibrachia satsuma Miura, Tsukahara and Hashimoto, 1997, is abundant. Copyright © 2012. Magnolia Press.


Komai T.,Natural History Museum and Institute | Poupin J.,CNRS Naval Academy Research Institute
Zootaxa | Year: 2013

Three species of the pagurid hermit crab genus Pagurixus Melin, 1939, are reported from Europa Island in the Mozambique Strait, western Indian Ocean: P. haigae Komai & Osawa, 2007, P. annulus n. sp., and P. europa n. sp. Pagurixus haigae is recorded from the western Indian Ocean for the first time. Pagurixus annulus n. sp. and P. europa n. sp. are referred to the P. boninensis (Melin, 1939) species group and P. anceps (Forest, 1954) group, respectively. Diagnostic characters of these two new species are discussed. Copyright © 2013 Magnolia Press.


Specimens belonging to the pagurid genus Pagurixus Melin, 1939 collected during various French expeditions made in the Indo-West Pacific were studied. Additional material from other sources is also included. Fifteen species have been identified, of which eight are new: Pagurixus aurantiaca sp. nov., P. cavicarpus sp. nov., P. crosnieri sp. nov., P. formosus sp. nov., P. icelus sp. nov., P. pilosus sp. nov., P. rubrovittatus sp. nov., and P. sculptus sp. nov. Pagurixus anceps (Forest, 1954) is redescribed on the basis of the syntypes and supplemental material from various localities. New locality records are reported for the following seven species: P. concolor Komai and Osawa, 2006, P. dissimilis Osawa and Komai, 2007, P. fasciatus Komai and Myorin, 2005, P. haigae Komai and Osawa, 2007, P. maorus (Nobili, 1906), P. nomurai Komai and Asakura, 1995, and P. ruber Komai and Osawa, 2006. An identification key to all known species is provided. © 2010 Taylor & Francis.

Loading Natural History Museum and Institute collaborators
Loading Natural History Museum and Institute collaborators