A new species of alpheid shrimp tentatively assigned to Salmoneus Holthuis, 1955 (Decapoda: Caridea) from the Ryukyu Islands, Japan

Zootaxa ◽  
2021 ◽  
Vol 4920 (2) ◽  
pp. 287-296
Author(s):  
TOMOYUKI KOMAI ◽  
TADAFUMI MAENOSONO ◽  
TOHRU NARUSE
Keyword(s):  
New Species ◽  
Dorsal Spine ◽  
Ryukyu Islands ◽  
Seagrass Beds ◽  
Shrimp Species ◽  
Soft Sediments ◽  
Iriomote Island ◽  
The Ryukyu Islands ◽  
A New Species ◽  
Alpheid Shrimp

A new alpheid shrimp species, provisionally assigned to the genus Salmoneus Holthuis, 1955, is described and illustrated on the basis of three specimens extracted from intertidal soft sediments on seagrass beds at Iriomote Island, southern Ryukyu Islands, Japan. Salmoneus singularis n. sp. is highly distinctive within the genus in having a pair of postorbital spines on the carapace, otherwise showing some affinities to the species of the S. gracilipes Miya, 1972 group. The possession of paired spines on the dorsolateral surface of the carapace is shared with several members of Triacanthoneus Anker, 2010, which is undoubtedly closely related to Salmoneus. However, the new species cannot be placed in Triacanthoneus because of the absence of a mid-dorsal spine on the carapace. 

Redescription of the poorly known ghost shrimp species, Scallasis amboinae Bate, 1888, review of the genus, and description of a new species from the Ryukyu Islands, Japan (Decapoda: Axiidea: Callianassidae)

Zootaxa ◽  
2020 ◽  
Vol 4766 (3) ◽  
pp. 401-420
Author(s):  
TOMOYUKI KOMAI ◽  
GARY C. B. POORE ◽  
YOSHIHISA FUJITA
Keyword(s):  
New Species ◽  
Papua New Guinea ◽  
New Guinea ◽  
Ryukyu Islands ◽  
Shrimp Species ◽  
Ghost Shrimp ◽  
The Ryukyu Islands ◽  
New Material ◽  
De Man ◽  
A New Species

A poorly known callianassid ghost shrimp species, Scallasis amboinae Bate, 1888, is redescribed and illustrated on the basis of the holotype and new material from Papua New Guinea. A new species, S. inermis, is described from the Ryukyu Islands, Japan. Callianassa (Cheramus) pygmaea De Man 1928 is synonymised with S. amboinae. All seven species of Scallasis are diagnosed and compared. 

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.

Eriocheir ogasawaraensis Komai, a new species of mitten crab (Crustacea: Decapoda: Brachyura: Varunidae) from the Ogasawara Islands, Japan, with notes on the systematics of Eriocheir De Haan, 1835

Zootaxa ◽  
2006 ◽  
Vol 1168 (1) ◽  
pp. 1 ◽  
Author(s):  
T. KOMAI ◽  
I. YAMASAKI ◽  
S. KOBAYASHI ◽  
T. YAMAMOTO ◽  
S. WATANABE
Keyword(s):  
New Species ◽  
Russian Far East ◽  
Far East ◽  
Ryukyu Islands ◽  
Crab Species ◽  
Ogasawara Islands ◽  
Mitten Crab ◽  
The Ryukyu Islands ◽  
A New Species ◽  
The Russian Far East

A new mitten crab species of the genus Eriocheir De Haan, 1835, E. ogasawaraensis n. sp., is described from the Ogasawara Islands, Japan. It is morphologically most similar to E. japonica (De Haan, 1835), found on the Japanese mainland, the Ryukyu Islands, Taiwan, the Russian Far East, Korea and China, but diagnostic is the proportionately broader and dorsally flattened carapace which usually lacks the fourth anterolateral tooth, the ornamentation of the epistome, the male first gonopod and its the coloration. The biology of the new species and the different interpretations concerning the systematics of Eriocheir are briefly discussed.

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