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. 

scholarly journals A review of some common Indo-Malayan and western Pacific species of Chthamalus barnacles (Crustacea: Cirripedia)

2003 ◽  
Vol 83 (4) ◽  
pp. 797-812 ◽  
Author(s):  
A.J. Southward ◽  
W.A. Newman
Keyword(s):  
Indian Ocean ◽  
Southern China ◽  
The Philippines ◽  
Western Pacific ◽  
Ryukyu Islands ◽  
Mariana Islands ◽  
Type Specimens ◽  
The Ryukyu Islands ◽  
The Indian Ocean ◽  
The Western Pacific

The type specimens of the common tropical intertidal barnacles Chthamalus malayensis and C. moro, were re-investigated and compared with other specimens of Chthamalus from the Indian Ocean, Indo-Malaya, northern Australia, Vietnam, China and the western Pacific, using ‘arthropodal’ as well as shell characters.  Chthamalus malayensis occurs widely in Indo-Malayan and tropical Australian waters. It ranges westwards in the Indian Ocean to East Africa and northwards in the Pacific to Vietnam, China and the Ryukyu Islands. Chthamalus malayensis has the arthropodal characters attributed to it by Pope (1965); conical spines on cirrus 1 and serrate setae with basal guards on cirrus 2.  Chthamalus moro is currently fully validated only for the Philippines, Indonesia, Taiwan, the Xisha (Paracel) Islands, the Ryukyu Islands, the Mariana Islands, the Caroline Islands, Fiji and Samoa. It is a small species of the ‘challengeri’ subgroup, lacking conical spines on cirrus 1 and bearing pectinate setae without basal guards on cirrus 2. It may be a ‘relict’ insular species.  Chthamalus challengeri also lacks conical spines on cirrus 1 and has pectinate setae without basal guards on cirrus 2. Records of C. challengeri south of Japan are probably erroneous. However, there is an undescribed species of the ‘challengeri’ subgroup in the Indian Ocean, Indo-Malaya, Vietnam and southern China and yet more may occur in the western Pacific. The subgroups ‘malayensis’ and ‘challengeri’ require genetic investigation.  Some comments are included on the arthropodal characters and geographical distributions of Chthamalus antennatus, C. dalli and C. stellatus.

Submarine cave hermit crabs (Crustacea: Decapoda: Anomura: Paguroidea) from three islands of the Ryukyu Islands, southwestern Japan

Zootaxa ◽  
2019 ◽  
Vol 4560 (3) ◽  
pp. 463 ◽  
Author(s):  
MASAYUKI OSAWA ◽  
YOSHIHISA FUJITA
Keyword(s):  
Hermit Crabs ◽  
Ryukyu Islands ◽  
Crab Species ◽  
Morphological Variations ◽  
Rocky Reefs ◽  
The Ryukyu Islands ◽  
Cryptic Habitats ◽  
Submarine Cave ◽  
Intraspecific Morphological Variation ◽  
Submarine Caves

Hermit crab species are reported on the basis of specimens collected by recent faunal surveys in submarine caves of three islands (Ie, Okinawa, and Shimoji Islands) of the Ryukyu Islands, southwestern Japan. The material includes three species in three genera of Diogenidae and 11 species in four genera of Paguridae. Catapaguroides longior Komai, Yamada & Shirakawa, 2010 and Pylopaguropsis granulata Asakura, 2000, each previously known only from the holotype, are recorded with intraspecific morphological variation observed in the present specimens. Color and morphological variations of Pagurixus nomurai Komai & Asakura, 1995 are also discussed. The present specimens of Catapaguroides foresti McLaughlin, 2002, C. longior, and Pylopaguropsis granulata suggest that the three species prefer the sandy or silty substrate in the deeper inner sites of submarine caves rather than other cryptic habitats in coral or rocky reefs.  

Redescription of the Red Sea gobiid fish Ctenogobiops maculosus (Fourmanoir) and validation of C. crocineus Smith

Zootaxa ◽  
2011 ◽  
Vol 3054 (1) ◽  
pp. 60 ◽  
Author(s):  
MARCELO KOVAČIĆ ◽  
SERGEY V. BOGORODSKY ◽  
JOHN E. RANDALL
Keyword(s):  
Indian Ocean ◽  
Great Barrier Reef ◽  
Red Sea ◽  
First Record ◽  
Type Locality ◽  
Ryukyu Islands ◽  
Barrier Reef ◽  
Gobiid Fish ◽  
The Ryukyu Islands ◽  
The Western Pacific

The shrimp-associated gobiid fish Ctenogobiops maculosus, briefly described by Fourmanoir (1955) from one specimen from the southern Red Sea, is redescribed and illustrated with underwater photographs. A diagnosis is given for the closely related C. crocineus Smith 1959, also with underwater photographs. Ctenogobiops maculosus is presently known only from the Red Sea. Ctenogobiops crocineus is wide-ranging from the Red Sea, and Indian Ocean (type locality, Seychelles), to the western Pacific, with records from the Great Barrier Reef and the Ryukyu Islands. The record of C. maculosus from Taiwan by Thacker et al. (2010) is reidentified as C. crocineus, a first record for the island, and their range extension of C. crocineus to Fiji is confirmed.

First record of Propagurus haigae (McLaughlin, 1997) (Decapoda, Anomura, Paguridae) from Japan

Crustaceana ◽  
2019 ◽  
Vol 92 (4) ◽  
pp. 477-483
Author(s):  
Masayuki Osawa ◽  
Takuo Higashiji
Keyword(s):  
First Record ◽  
Distribution Range ◽  
Ryukyu Islands ◽  
Single Specimen ◽  
Present Specimen ◽  
The Third ◽  
Japanese Waters ◽  
First Time

Abstract Propagurus haigae (McLaughlin, 1997), a relatively large-sized species of Paguridae, is reported for the first time from Japanese waters based on a single specimen collected from a depth of 620 m off Ie Island, central Ryukyu Islands, southwestern Japan. It is the third species of the genus Propagurus McLaughlin & de Saint Laurent, 1998 known from Japanese waters. The present specimen greatly extends the distribution range of P. haigae, because the previous northernmost record was the Molucca Sea in Indonesia.

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.

Two new species of Pagurixus (Crustacea: Decapoda: Anomura: Paguridae) from submarine caves of the Ryukyu Islands, southwestern Japan

Zootaxa ◽  
2006 ◽  
Vol 1148 (1) ◽  
pp. 27 ◽  
Author(s):  
MASAYUKI OSAWA ◽  
YOSHIHISA FUJITA ◽  
JUNJI OKUNO
Keyword(s):  
New Species ◽  
Ventral Surface ◽  
Species Group ◽  
Anterior Lobe ◽  
Ryukyu Islands ◽  
Ultimate Segment ◽  
The Ryukyu Islands ◽  
Two New Species ◽  
Submarine Caves ◽  
Antennular Peduncle

Two new species of Pagurixus Melin, 1939, P. pulcher and P. longipes, are described from the submarine caves of the Ryukyu Islands, southwestern Japan. These species belong to the different informal species group of the genus characterized by the presence or absence of two distinct, longitudinal rows or series of setae on the ventral surface of the antennular ultimate segment. Pagurixus pulcher is most closely allied to P. nomurai Komai & Asakura, 1995, but is differentiated by the more slender ocular peduncles, setation on the ultimate segment of the antennular peduncle, and shape of the anterior lobe of the sixth thoracic sternite. The extremely long and slender carpus of the left cheliped and dactyli of the ambulatory pereopods clearly distinguish P. longipes from other species belonging to the species group characterized by the absence of longitudinal rows or series of setae on the ventral surface of the antennular ultimate segment.

Seborgia cavernicola sp. nov. from a submarine cave on Okinawa Island, Ryukyu Islands, southwestern Japan (Crustacea, Amphipoda, Seborgiidae)

Zootaxa ◽  
2021 ◽  
Vol 4927 (1) ◽  
pp. 133-142
Author(s):  
MICHITAKA SHIMOMURA ◽  
YOSHIHISA FUJITA
Keyword(s):  
First Record ◽  
Ryukyu Islands ◽  
Key To Species ◽  
Okinawa Island ◽  
The Family ◽  
Submarine Cave

A new seborgiid, Seborgia cavernicola sp. nov. is described from a submarine cave in Okinawa Island, Ryukyu Islands as the first record of the family from Japan. This species differs from its congeners by the following combination of characters: body without microspinules; eyes fainted, without ommatidia; epimeral plates with posterodistal angle produced into pointed process; main flagellum of antennule 4-articulate; article 2 of main flagellum of antennule longest; propodus of gnathopod 2 as long as wide; gland cone of antenna directed anteriorly; maxilla bilobed; uropod 3 biramous; and telson without setae and setules. A key to species of the genus is provided. 

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.

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