Confirmation of blacktip shark,Carcharhinus limbatus, in the Ryukyu Islands and notes on possible absence ofC. melanopterus in Japanese waters

1999 ◽  
Vol 46 (2) ◽  
pp. 193-198 ◽  
Author(s):  
Kazunari Yano ◽  
John F. Morrissey
Keyword(s):  
Ryukyu Islands ◽  
Blacktip Shark ◽  
Carcharhinus Limbatus ◽  
The Ryukyu Islands ◽  
Japanese Waters

A new antipatharian-associated species of the genus Cuapetes Clark, 1919 (Crustacea: Decapoda: Palaemonidae) and a new record of C. nilandensis (Borradaile, 1915) from Japan

Zootaxa ◽  
2012 ◽  
Vol 3367 (1) ◽  
pp. 115 ◽  
Author(s):  
JUNJI OKUNO ◽  
TIN-YAM CHAN
Keyword(s):  
New Species ◽  
New Record ◽  
Type Species ◽  
Ryukyu Islands ◽  
The Ryukyu Islands ◽  
Japanese Waters ◽  
Associated Species ◽  
First Time

Two antipatharian-associated species of the pontoniine shrimp genus Cuapetes Clark, C. lanceolatus sp. nov. and C.nilandensis (Borradaile), are reported from the Ryukyu Islands, Japan. The new species appears closest to C. akiensis(Kubo) and C. calmani (Tattersall), but differs considerably from the latter two species in the shape of the rostrum and thelength of upper antennular flagellum. Cuapetes nilandensis, the type species of the genus, is recorded from Japanese waters for the first time.

Redescription of a poorly known upogebiid mud shrimp Gebiacantha acanthochela (Sakai, 1967) and description of a new species of the genus from the Ryukyu Islands, Japan (Decapoda: Gebiidea)

Zootaxa ◽  
2020 ◽  
Vol 4881 (2) ◽  
pp. 307-322
Author(s):  
TOMOYUKI KOMAI
Keyword(s):  
New Species ◽  
New Caledonia ◽  
Original Description ◽  
Ryukyu Islands ◽  
Okinawa Island ◽  
The Ryukyu Islands ◽  
Female Holotype ◽  
Mud Shrimp ◽  
Japanese Waters ◽  
Amami Islands

Two species of the upogebiida mud shrimp genus Gebiacantha Ngoc-Ho, 1989, currently represented by 19 described species, are reported from the Ryukyu Islands, Japan. The first, G. acanthochela (Sakai, 1967), is redescribed in detail based on two female specimens from Amami Islands the second discovered since the original description, enabling better assessment of its diagnostic characters. The second, G. fortispinata n. sp., is described on the basis of a single female holotype from Okinawa Island. It appears closest to G. multispinosa Ngoc-Ho, 1994, known with certainty only from New Caledonia, but the proportionally narrower telson with a more deeply notched posterior margin and the distally unarmed pereopod 3 merus distinguish the new species from G. multispinosa. Three species of Gebiacantha, including G. sagamiensis Komai, 2017, are now known from Japanese waters.

Two large squat lobsters of the superfamily Chirostyloidea (Crustacea: Decapoda: Anomura) from the Ryukyu Islands, southwestern Japan, with description of a new species of the genus Eumunida Smith, 1883

Zootaxa ◽  
2019 ◽  
Vol 4555 (3) ◽  
pp. 319
Author(s):  
MASAYUKI OSAWA ◽  
TAKUO HIGASHIJI
Keyword(s):  
New Species ◽  
Ryukyu Islands ◽  
Deep Waters ◽  
The Ryukyu Islands ◽  
Japanese Waters ◽  
First Time ◽  
A New Species ◽  
Squat Lobsters

Two species of the chirostyloid families Sternostylidae and Eumunididae, Sternostylus investigatoris (Alcock & Anderson, 1899) and Eumunida balteipes n. sp., are reported on the basis of material collected from deep waters off Kume Island, Ryukyu Islands, southwestern Japan. Sternostylus investigatoris is recorded for the first time and is the second species of the genus from Japanese waters. Eumunida balteipes n. sp. is morphologically closest to E. sternomaculata de Saint Laurent & Macpherson, 1990, but the armature of the thoracic sternite 3 and P1 palm distinguishes the two species. 

A comprehensive taxonomic list of brittle stars (Echinodermata: Ophiuroidea) from submarine caves of the Ryukyu Islands, southwestern Japan, with a description of a rare species, Dougaloplus echinatus (Amphiuridae)

Zootaxa ◽  
2019 ◽  
Vol 4571 (1) ◽  
pp. 73 ◽  
Author(s):  
MASANORI OKANISHI ◽  
YOSHIHISA FUJITA
Keyword(s):  
Indian Ocean ◽  
Rare Species ◽  
Southern China ◽  
First Record ◽  
Ryukyu Islands ◽  
Brittle Stars ◽  
The Ryukyu Islands ◽  
Submarine Cave ◽  
Japanese Waters ◽  
Submarine Caves

The ophiuroid species listed were collected by benthic faunal surveys from 2016 to 2018 in submarine caves of the Ryukyu Islands, southwestern Japan. The material includes 20 species from 8 families, Amphiuridae, Ophiocomidae, Ophiodermatidae, Ophiolepididae, Ophioleucidae, Ophiomyxidae, Ophionereididae and Ophiotrichidae. This is the first comprehensive report of submarine cave-dwelling ophiuroids from Japanese waters. Also provided is a redescription of a rare species, Dougaloplus echinatus (Ljungman, 1867), with a detailed description of its ossicle morphology. The species has previously been reported from Brazil, Australia, Eastern Indian Ocean to Southern China, in 11–118 m depth, and this is the first record of D. echinatus from Japanese waters. A brief discussion of the scarcity of submarine cave systems, and the need for their conservation, is provided. 

Redescription of the pagurid hermit crab Catapaguroides fragilis (Melin, 1939) and descriptions of two new species from deep-sea off the Ryukyu Islands, Japan (Crustacea: Decapoda: Anomura)

Zootaxa ◽  
2017 ◽  
Vol 4273 (2) ◽  
pp. 235
Author(s):  
TOMOYUKI KOMAI
Keyword(s):  
New Species ◽  
Hermit Crab ◽  
Deep Sea ◽  
Distal Portion ◽  
Ryukyu Islands ◽  
Additional Material ◽  
Characteristic Shape ◽  
The Ryukyu Islands ◽  
Two New Species ◽  
Japanese Waters

Three species of the pagurid hermit crab genus Catapaguroides A. Milne-Edwards & Bouvier, 1892, all from Japanese waters, are reported. Catapaguroides fragilis (Melin, 1939) is redescribed on the basis of the holotype and additional material from southern Japan. Diagnostic characters of this poorly known species are fully assessed. Two new species, C. bythos and C. rubromaculatus, are described and illustrated on the basis of material from upper bathyal depths off the Ryukyu Islands. Catapaguroides rubromaculatus n. sp. resembles C. fragilis and C. hirsutus Komai & Rahayu, 2013, but the characteristic shape of the ocular peduncle and the elongate male right sexual tube with an anteriorly directed distal portion readily separate C. rubromaculatus n. sp. from the latter two congeners. Catapaguroides bythos n. sp. appears close to C. mortenseni de Saint Laurent, 1968 and C. pectinipes (Lewinsohn, 1969), but the different armature of the chelipeds distinguishes C. bythos n. sp. from the latter two allies. Catapaguroides is now represented by 30 species. 

New records of six deep-sea caridean shrimps (Crustacea: Decapoda) from the Ryukyu Islands and its adjacent waters, southwestern Japan

Zootaxa ◽  
2018 ◽  
Vol 4457 (1) ◽  
pp. 114
Author(s):  
TOMOYUKI KOMAI ◽  
SUSUMU OHTSUKA ◽  
SHUHEI YAMAGUCHI ◽  
KAZUMITSU NAKAGUCHI
Keyword(s):  
Deep Sea ◽  
New Records ◽  
Biological Science ◽  
Ryukyu Islands ◽  
West Pacific ◽  
The North ◽  
South West ◽  
The Ryukyu Islands ◽  
Japanese Waters ◽  
First Time

Six species of caridean shrimps from four families are recorded from Japanese waters for the first time on the basis of material from the Ryukyu Islands and its adjacent waters, collected during research cruises of the T/RV “Toyoshio-maru” of Faculty of Applied Biological Science, Hiroshima University: two species of Crangonidae, Lissosabinea unispinosa Komai, 2006 and Pseudopontophilus serratus Komai, 2004; one species of Oplophoridae, Systellaspis pellucida (Filhol, 1885); one species of Pandalidae, Calipandalus elachys Komai & Chan, 2003; and two species of Pasiphaeidae, Pasiphaea debitusae Hayashi, 1999 and P. gracilis Hayashi, 1999. Of them, L. unispinosa, Pseudopontophilus serratus, Pasiphaea debitusae and P. gracilis are heretofore known from the South-West Pacific localities, and then the geographical ranges of these four species are greatly extended to the north and west. Illustrations and/or colour images are provided for each species to supplement previous descriptions and to give evidence for identification.

A new squat lobster species of the genus Munida (Decapoda, Anomura, Munididae) from the deep-sea off the Ryukyu Islands, Japan

Crustaceana ◽  
2017 ◽  
Vol 90 (7-10) ◽  
pp. 969-979
Author(s):  
Tomoyuki Komai
Keyword(s):  
New Species ◽  
Deep Sea ◽  
The Philippines ◽  
Ryukyu Islands ◽  
Single Male ◽  
Okinawa Island ◽  
Male Specimen ◽  
Squat Lobster ◽  
The Ryukyu Islands ◽  
Japanese Waters

Munida michaeli, a new species of deep-sea squat lobster (Munididae), is described and illustrated on the basis of a single male specimen collected off Okinawa Island, Ryukyu Islands, Japan, at depths of 641-650 m. It closely resemblesM. sacksiMacpherson, 1993 known with certainty only from the Philippines, but different spination of the carapace dorsum and the greatly reduced armature of the flexor margins of the ambulatory dactyli distinguish the new species from the latter. With the addition of the present new species, 41 species ofMunidaLeach, 1820 are now known from Japanese waters.

scholarly journals Review of the Japanese records of an endangered grouper, Epinephelus tukula, with comments on its population status (Teleostei, Serranidae)

ZooKeys ◽  
2018 ◽  
Vol 772 ◽  
pp. 153-163 ◽  
Author(s):  
Atsunobu Murase ◽  
Ryohei Miki ◽  
Masaaki Wada ◽  
Masahide Itou ◽  
Hiroyuki Motomura ◽  
...  
Keyword(s):  
Distribution Pattern ◽  
Continuous Distribution ◽  
Kuroshio Current ◽  
Red List ◽  
The Internet ◽  
Ryukyu Islands ◽  
Population Status ◽  
Warm Current ◽  
Japanese Waters ◽  
The Kuroshio

The Potato Grouper, Epinephelustukula, is relatively rare worldwide. Records from the northernmost part of its range (Japan) have been few, resulting in a “Critically Endangered” listing on the Red List for Japan. The Japanese records were revised by examining literature, new specimens, photographs, and the internet, and a continuous distribution pattern from the tropical Ryukyu Islands (including adult individuals) to temperate regions affected by the Kuroshio Current were delineated; this suggests the species inhabits tropical Japan and can spread to temperate regions via the warm current. The species possibly reproduces in Japanese waters but further reproductive ecology research is required.

Monthly Water Exchange through the Ryukyu Islands Revealed by Salinity Structural Changes

2013 ◽  
Vol 864-867 ◽  
pp. 2335-2339
Author(s):  
Ya Pan Liu ◽  
Jian Cheng Kang ◽  
Jiong Zhu ◽  
Qin Chen Han
Keyword(s):  
Structural Changes ◽  
Water Exchange ◽  
High Salinity ◽  
World Ocean ◽  
Core Layer ◽  
Ryukyu Islands ◽  
High Salinity Water ◽  
The Ryukyu Islands ◽  
Salinity Water ◽  
World Ocean Atlas

Using salinity database of World Ocean Atlas 2009 (WOA09) issued by NOAA in 2010, refer the range of high-salinity tongue to indicate the strength about high-salinity water, from the perspective of structural changes of salinity; the water exchange through Ryukyu Islands upper 500 m have been analyzed, the results show that: due to Ryukyu Trough, currents on both sides of Ryukyu Islands occur exchange, for upper 500 m, high-salinity water in east of the Ryukyu Islands mainly invade the west waterthe Kuroshio in East China Sea; the intrusion strength is powerful from the depth of 100 m to 200 m, and the 150 m layer is the core layer of high-salinity water intrusion; the high-salinity water at the east of Ryukyu Islands invades the Kuroshio are stronger in March, May, June, September, October and November, are weaker in April and December.

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