A new genus and new species of Paguridae (Crustacea: Decapoda: Anomura) from shallow subtidal waters in Okinawa Island, the Ryukyu Islands, Japan

Zootaxa ◽  
2015 ◽  
Vol 3918 (2) ◽  
pp. 250
Author(s):  
TOMOYUKI KOMAI
Keyword(s):  
New Species ◽  
New Genus ◽  
Ryukyu Islands ◽  
Okinawa Island ◽  
The Ryukyu Islands ◽  
Shallow Subtidal

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.

A new hermit crab species of the genus Catapagurus (Crustacea: Decapoda: Anomura: Paguridae) from the Ryukyu Islands, southern Japan

Zootaxa ◽  
2009 ◽  
Vol 2211 (1) ◽  
pp. 57-68 ◽  
Author(s):  
TOMOYUKI KOMAI ◽  
MASAYUKI OSAWA
Keyword(s):  
New Species ◽  
Hermit Crab ◽  
Species Group ◽  
Shallow Waters ◽  
Ryukyu Islands ◽  
Crab Species ◽  
Okinawa Island ◽  
The Ryukyu Islands ◽  
The Family ◽  
A New Species

A new species of the pagurid hermit crab genus Catapagurus A. Milne-Edwards, 1880, C. insolitus, is described and illustrated based on specimens from shallow waters in Okinawa Island, the Ryukyus. It belongs to an informal species group characterized by the possession of blade-shaped ambulatory dactyli, and is morphologically most similar to C. kosugei (Asakura, 2001). However, the new species is unique within the genus in having a multispinose antennal acicle, rarely seen in species of the family Paguridae.

Comanthus kumi, a new shallow-water comatulid (Echinodermata: Crinoidea: Comatulida: Comasteridae) from the Ryukyu Islands, Japan

Zootaxa ◽  
2012 ◽  
Vol 3367 (1) ◽  
pp. 261 ◽  
Author(s):  
YOSHIHISA FUJITA ◽  
MASAMI OBUCHI
Keyword(s):  
New Species ◽  
Coral Reefs ◽  
Shallow Water ◽  
Small Hole ◽  
Ryukyu Islands ◽  
Okinawa Island ◽  
The Ryukyu Islands ◽  
A New Species

A new species of the genus Comanthus A.H. Clark, 1908, is described on the basis of specimens collected from KumeIsland and Okinawa Island, the Ryukyu Islands, Japan. Comanthus kumi n. sp. is distinguished from all ten congeners byhaving extremely elongate arms exceeding 300 mm in length and the colouration in life. The new species concealed itswhole 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.

A new genus and new species of alpheid shrimp from a marine cave in the Ryukyu Islands, Japan, with additional record of Salmoneus antricola Komai, Yamada & Yunokawa, 2015 (Crustacea: Decapoda: Caridea)

Zootaxa ◽  
2018 ◽  
Vol 4369 (4) ◽  
pp. 575 ◽  
Author(s):  
TOMOYUKI KOMAI ◽  
YOSHIHISA FUJITA
Keyword(s):  
New Species ◽  
New Genus ◽  
Original Description ◽  
Ryukyu Islands ◽  
New Taxon ◽  
Monotypic Genus ◽  
Diagnostic Characters ◽  
The Ryukyu Islands ◽  
Minor Form ◽  
Alpheid Shrimp

Two species of alpheid shrimp collected from a marine cave off Ie Island, Okinawa Islands, Ryukyu Islands, Japan, are reported. Caligoneus cavernicola n. gen., n. sp., is described on the basis of six specimens, including two ovigerous individuals. The new monotypic genus shares a number of features with Salmoneus Holthuis, 1955 and Triacanthoneus Anker, 2010; however, the dorsally elevated rostrum and the symmetrical pereopods 1 (= chelipeds) of “minor form” distinguish Caligoneus n. gen. from the latter two genera. Other potentially diagnostic characters between the new genus and the latter two genera are also discussed. The new taxon is clearly adapted to stygobiotic environments, with its reduced cornea and very slender elongate pereopods. In addition, two complete specimens of Salmoneus antricola Komai, Yamada & Yunokawa, 2015, collected in the same cave, supplement the original description of the species, which was based on a unique holotype with a damaged telson. 

Designation of Ancylomenes gen. nov., for the ‘Periclimenes aesopius species group’ (Crustacea: Decapoda: Palaemonidae), with the description of a new species and a checklist of congeneric species

Zootaxa ◽  
2010 ◽  
Vol 2372 (1) ◽  
pp. 85-105 ◽  
Author(s):  
J. OKUNO ◽  
A. J. BRUCE
Keyword(s):  
New Species ◽  
New Genus ◽  
Species Group ◽  
Ryukyu Islands ◽  
Congeneric Species ◽  
Orbital Margin ◽  
The Ryukyu Islands ◽  
Dorsal Process ◽  
Pacific Species ◽  
A New Species

A new genus of the subfamily Pontoniinae, Ancylomenes gen. nov. is established for the ‘Periclimenes aesopius species group’ of the genus Periclimenes Costa. The new genus is distinguished from other genera of Pontoniinae on account of the strongly produced inferior orbital margin with reflected inner flange, and the basicerite of the antenna armed with an angular dorsal process. Fourteen species have been previously recognized as belonging to the ‘P. aesopius species group’. One Eastern Pacific species (P. lucasi Chace), and two Atlantic species (P. anthophilus Holthuis & EiblEibesfeldt, and P. pedersoni Chace) are now also placed in Ancylomenes gen. nov. A further new species associated with a cerianthid sea anemone, A. luteomaculatus sp. nov. is described and illustrated on the basis of specimens from the Ryukyu Islands, southern Japan, and Philippines. A key for their identification, and a checklist of the species of Ancylomenes gen. nov. are provided.

A new genus and new species assigned to Macrophthalmidae (Decapoda: Brachyura: Thoracotremata) from the Ryukyu Islands, Japan

Zootaxa ◽  
2018 ◽  
Vol 4531 (1) ◽  
pp. 109 ◽  
Author(s):  
TOMOYUKI KOMAI ◽  
YOSHIHISA FUJITA
Keyword(s):  
New Species ◽  
Type Species ◽  
New Genus ◽  
Ryukyu Islands ◽  
Single Male ◽  
Male Specimen ◽  
Ishigaki Island ◽  
The Ryukyu Islands ◽  
The Family

Mirograpsus asper is described as a new genus and new species in the subfamily Ilyograpsinae Števčić, 2005, of the family Macrophthalmidae Dana, 1851, on the basis of a single male specimen from Ishigaki Island, Ryukyu Islands, Japan. The new genus most closely resembles the monotypic Apograpsus Komai & Wada, 2008 (type species, Ilyograpsus paantu Naruse & Kishino, 2006), sharing a similar carapace shape, but is differentiated chiefly by the fusion of the male pleomeres 4–6 and the unarmed meri of the ambulatory legs. The functional fusion of the male pleomeres 4–6 is unique in the Macrophthalmidae. 

A new genus and new species of leucosiid crab (Crustacea: Decapoda: Brachyura) from coral reefs in the Indo-West Pacific

Zootaxa ◽  
2012 ◽  
Vol 3352 (1) ◽  
pp. 40 ◽  
Author(s):  
TOMOYUKI KOMAI ◽  
PETER K. L. NG
Keyword(s):  
New Species ◽  
Key Words ◽  
New Genus ◽  
Abdominal Cavity ◽  
Ryukyu Islands ◽  
Coral Rubble ◽  
West Pacific ◽  
Superficial Resemblance ◽  
The Ryukyu Islands ◽  
Female Abdomen

A new genus and new species of leucosiid crab, Coralliocryptus caementa n. sp., is described from Indo-West Pacific coralreefs in the Ryukyu Islands (Japan), Vanuatu, and Comoros. Although the new genus exhibits superficial resemblance to theIphiculidae in having prominent vertical spiniform teeth on the cutting edges of the chela and the female abdomen consisting offreely articulated somites, the deeply excavated female sterno-abdominal cavity, which is completely covered by the abdomen,unambiguously places this unique taxon in the Leucosiidae. The highly eroded, coral-rubble mimic carapace suggests somedegree of relationship between Coralliocryptus and some other ebaliinine genera, e.g., Alox Tan & Ng, 1995, Oreophorus Rüppel, 1830, Oreotlos Ihle, 1918.Key words: Crustacea, Decapoda, Brachyura, Leucosiidae, new genus, new species, Indo-West Pacific

A new genus and new species of deep-water trapeziid crab (Crustacea: Decapoda: Brachyura: Trapezioidea) from the Ryukyu Islands, Japan

Zootaxa ◽  
2010 ◽  
Vol 2555 (1) ◽  
pp. 62 ◽  
Author(s):  
TOMOYUKI KOMAI ◽  
TAKUO HIGASHIJI ◽  
PETER CASTRO
Keyword(s):  
New Species ◽  
Deep Water ◽  
Anterior Margin ◽  
New Genus ◽  
Ryukyu Islands ◽  
Symbiotic Association ◽  
New Taxon ◽  
Lateral Spine ◽  
The Ryukyu Islands ◽  
Okinawa Prefecture

A new genus and new species of trapeziid crab, Hexagonaloides bathyalis, is described from Okinawa, Ryukyu Islands (Okinawa Prefecture), Japan, on the basis of two male specimens collected at a depth of 247 m. The new genus is unique among the Trapeziidae in having a combination of the hexagonal carapace bearing a single lateral spine and a smooth frontal margin and the unarmed anterior margin of the cheliped meri. The symbiotic association of the new taxon remains unknown.

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