scholarly journals A New Species of the Hermit Crab Genus Pagurixus (Crustacea: Decapoda: Anomura: Paguridae) from Shallow Coral Reefs of Ishigaki Island, Ryukyu Islands

2006 ◽  
Vol 11 (4) ◽  
pp. 327-337 ◽  
Author(s):  
Tomoyuki Komai ◽  
Yoshitake Takada
Keyword(s):  
New Species ◽  
Coral Reefs ◽  
Hermit Crab ◽  
Ryukyu Islands ◽  
Ishigaki Island ◽  
A New Species

A new species of Trichopagurus de Saint Laurent (Crustacea: Decapoda: Anomura: Paguridae) from the Ryukyu and Yap Islands, and redescription of T. trichophthalmus (Forest)

Zootaxa ◽  
2005 ◽  
Vol 801 (1) ◽  
pp. 1
Author(s):  
TOMOYUKI KOMAI ◽  
MASAYUKI OSAWA
Keyword(s):  
New Species ◽  
Hermit Crab ◽  
Type Species ◽  
Ventral Surface ◽  
Ryukyu Islands ◽  
Crab Species ◽  
The Ryukyu Islands ◽  
Gill Lamellae ◽  
A New Species

Discovery of a new hermit crab species from the Ryukyu Islands, Japan, led us to reexamine the holotype and supplemental specimens of Trichopagurus trichophthalmus (Forest), the type species of the heretofore monotypic Trichopagurus de Saint Laurent. Our examination has revealed that the gill lamellae of T. trichophthalmus are actually entire (= biserial), rather than shallowly divided distally (= quadriserial) as reported by de Saint Laurent (1970). The new species is assigned to Trichopagurus because of the 11 pairs of biserial gills, well-developed rostrum, moderately long male right sexual tube directed toward exterior, and the possession of a single left gonopore in female. The new species, T. macrochela n. sp., is distinguished from T. trichophthalmus primarily by the dorsoventrally flattened carpus with a distinctly delimited dorsomesial margin, less setose ambulatory legs, and markedly asymmetrical coxae of the female fifth pereopods, of which the left bears numerous setae on the ventral surface. It has been also shown that previous records of T. trichophthalmus from the Palau and Yap Islands are based on both true T. trichophthalmus and T. macrochela. A comparative, updated redescription of T. trichophthalmus is also provided.

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.

A new species of the axiid shrimp genus Manaxius Kensley, 2003 (Decapoda: Axiidea) from shallow coral reefs of the western Pacific

Zootaxa ◽  
2020 ◽  
Vol 4858 (4) ◽  
pp. 507-520
Author(s):  
TOMOYUKI KOMAI ◽  
ARTHUR ANKER
Keyword(s):  
New Species ◽  
Coral Reefs ◽  
French Polynesia ◽  
Dorsal Margin ◽  
Ryukyu Islands ◽  
Society Islands ◽  
The Ryukyu Islands ◽  
Female Holotype ◽  
De Man ◽  
A New Species

Manaxius paullus, a new species of axiid burrowing shrimp, is described on the basis of a female holotype from the Society Islands, French Polynesia, and a female paratype from the Ryukyu Islands, Japan. Both specimens were collected on shallow coral reefs. The new species is morphologically closest to five of 17 congeners, viz., M. euophthalmus (de Man, 1905), M. izuensis (Komai, 2011), M. mimasensis (Sakai, 1967), M. poupini (Komai, 2016) and M. supia Poore, 2020, but can be separated from all of them by the rostrum being relatively broad and with one pair of lateral spines, in addition to a pair of supraocular spines; the presence of a subdistal spine on the dorsal margin of the cheliped ischium; the presence of additional three or four small spines on each cheliped palm, adjacent to the dorsal margin; and the lack of a spine near the base of the fingers of each cheliped palm. 

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 species of pagurid hermit crab assigned to the genus Kumepagurus Komai & Osawa, 2012 (Decapoda: Anomura: Paguroidea) from the Kaikata Seamount, Izu-Ogasawara Arc, Japan

Zootaxa ◽  
2020 ◽  
Vol 4858 (2) ◽  
pp. 241-250
Author(s):  
TOMOYUKI KOMAI
Keyword(s):  
New Species ◽  
Hermit Crab ◽  
Type Species ◽  
Northwestern Pacific ◽  
Generic Diagnosis ◽  
Ryukyu Islands ◽  
The Family ◽  
The Difference ◽  
The Right ◽  
A New Species

A new pagurid hermit crab species is assigned to the genus Kumepagurus Komai & Osawa, 2012, previously represented only by the type species, K. cavernicolus Komai & Osawa, 2012, known only from a marine cave on Ryukyu Islands, northwestern Pacific. The assignment is made because of the lack of an accessory tooth on the maxilliped 3 ischium, the operculiform right chela, the presence of two distal corneous claws on the left chela fixed finger, the simple pereopods 4 and the development and structure of the male sexual tubes on both coxae of pereopods 5, all characteristic to the type species of the genus. However, in contrast to K. cavernicolus, K. kaikata n. sp. lacks pleurobranchs on the thoracomeres 5 and 6, and in this regard, Kumepagurus is unusual in the family Paguridae. The generic diagnosis of Kumepagurus is emended to accommodate the new species, which is readily distinguished from K. cavernicolus by the proportionately shorter antennular and antennal peduncles and the right cheliped structure and ornamentation, in addition to the difference in the gill number. 

A new species of the genus Pagurus Fabricius, 1775 (Crustacea: Decapoda: Anomura: Paguridae) from the Ryukyu Islands, southwestern Japan

Zootaxa ◽  
2012 ◽  
Vol 3367 (1) ◽  
pp. 155 ◽  
Author(s):  
MASAYUKI OSAWA
Keyword(s):  
New Species ◽  
Hermit Crab ◽  
Dorsal Surface ◽  
Ryukyu Islands ◽  
The Ryukyu Islands ◽  
Distributional Patterns ◽  
A New Species

A new species of pagurid hermit crab, Pagurus tabataorum n. sp., is described from Kume Island, Ryukyu Islands,southwestern Japan. It appears closest to P. capsularis McLaughlin, 1997, known from the Tanimbar Islands in Indonesia,but is readily distinguished by the possession of numerous arcuate or sinuous, transverse scutes on the dorsal surface ofthe chelae. Distributional patterns of species of the genus Pagurus Fabricius, 1775, hitherto recorded from the Ryukyu Islands are briefly reviewed.

Enneophyllus ecarina, a new species of scaphopod shell dwelling hermit crab (Crustacea: Decapoda: Anomura: Paguridae) from deep-sea off the Ryukyu Islands, southern Japan

Zootaxa ◽  
2017 ◽  
Vol 4269 (4) ◽  
pp. 593
Author(s):  
TOMOYUKI KOMAI
Keyword(s):  
New Species ◽  
Hermit Crab ◽  
Deep Sea ◽  
Type Species ◽  
Generic Diagnosis ◽  
Ryukyu Islands ◽  
Southern Japan ◽  
The Ryukyu Islands ◽  
A New Species

A second species of the pagurid genus Enneophyllus McLaughlin, 1997, E. ecarina n. sp., is described and illustrated on the basis of two specimens collected from the upper bathyal depths off Amami-ohshima Island, Ryukyu Islands, southern Japan. The new species is immediately distinguished from the sole known congener, E. spinirostris McLaughlin, 1997, from the Banda Sea, Indonesia, by the non-operculiform right chela and fewer ventral spiniform setae of the ambulatory dactyli. The type species of Enneophillus, E. spinirostris, was represented only by the male holotype, and examination of the female paratype of this new species enables documentation of female characteristics in the generic diagnosis. Like E. spinirostris, the new species inhabits scaphopod shells.

A new species of the hermit crab genus Diogenes Dana, 1851 (Decapoda: Anomura: Diogenidae) from southern India

Zootaxa ◽  
2018 ◽  
Vol 4504 (2) ◽  
pp. 243
Author(s):  
TOMOYUKI KOMAI ◽  
RAVEENDHIRAN RAVINESH ◽  
APPUKUTTANNAIR BIJU KUMAR
Keyword(s):  
New Species ◽  
Hermit Crab ◽  
Southern India ◽  
Distal Spine ◽  
Callyspongia Diffusa ◽  
Different Color ◽  
A New Species

A new species of the hermit crab genus Diogenes Dana, 1851, D. spongicola, is described and illustrated on the basis of material collected from two locations off southern India. It appears close to D. takedai Rahayu, 2012 among about 70 congeners, but easily differentiated from the latter by the spinulose anterolateral margins of the shield, the article 2 of the antennal peduncle armed only with one distal spine, the longer, spinose antennal acicle, the absence of prominent spines on the ventrolateral margin of the cheliped meri, and the different color of the cheliped palm. Specimens of the new species were all collected from cavities of a callyspongiid sponge Callyspongia diffusa (Ridley, 1884), suggesting a possible association between the hermit crab and sponge. 

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