Macrobrachium miyakoense Komai & Fujita, 2005

Fujita, Yoshihisa, Davie, Peter J. F. & Ng, Peter K. L., 2015, A new stygobitic prawn of the genus Macrobrachium Spence Bate, 1864, from anchialine caves in Christmas Island, Indian Ocean; with a rediagnosis of M. miyakoense Komai & Fujita, 2005 (Crustacea: Decapoda: Caridea: Palaemonidae), Raffles Bulletin of Zoology 63, pp. 610-625: 612

publication ID

http://doi.org/10.5281/zenodo.5386998

publication LSID

lsid:zoobank.org:pub:6754EC0D-D380-44FF-9B94-8FD3BF9934C9

persistent identifier

http://treatment.plazi.org/id/4E38EB1E-FFEE-FFF5-B3D4-FACEFBF5FBA4

treatment provided by

Valdenar

scientific name

Macrobrachium miyakoense Komai & Fujita, 2005
status

 

Macrobrachium miyakoense Komai & Fujita, 2005  

( Figs. 1–3 View Fig View Fig View Fig )

Macrobrachium miyakoense   – Komai & Fujita, 2005: 14 View Cited Treatment ; De Grave & Fransen, 2011: 327.

Material examined. 1 female (RUMF-ZC-2664), pocl 21.8 mm, Ueno Ana-ga Cave , Miyako Island, 24°43’13.9”N, 125°19’19.5”E, Ryukyu Islands, Japan, baited trap, coll. by Y. Fujita, 15 September 2009 GoogleMaps   ; 1 male (RUMF-ZC-2665), pocl 18.9 mm, Ueno Ana-ga Cave , Miyako Island, Ryukyu Islands, Japan, baited trap, coll. by Y. Fujita, 15 August 2010   .

Supplementary description. Compared to types, rostrum ( Figs. 1A View Fig , 2A View Fig ) directed anteriorly, sharply pointed distally, reaching/over-reaching distal end of antennular peduncle, not reaching distal margin of antennal scale, 0.45–0.52 of carapace length; dorsal margin with 10 teeth, 4 on carapace posterior to orbital margin; ventral margin with 4 or 5 teeth. Eye ( Figs. 1B View Fig , 2B View Fig ) reduced; stalk short, oblique, weakly swollen anteriorly; cornea small, oblique, faceted with dark pigments, 1.91–1.97 times wider than deep, 0.82–0.83 stalk width; ocellus absent. Epistome weakly bilobed by shallow depression. Male (RUMF-ZC-2665): second pereiopods ( Fig. 1C, D, E View Fig ) moderately robust, similar in form, unequal in length; left 1.68 times longer than right; surface from dactylus to ischium covered with numerous minute spinules, sparsely setose. Left (major) cheliped robust; ischium 0.68 of merus length; merus 1.01 of carpus length; carpus 0.58 length of chela; palm subcylindrical, 0.43 of chela length, dactylus 1.38 of palm length, 0.59 of chela length; cutting edge of fingers not gaping, with low, blunt teeth on proximal margins. Right (minor) cheliped ( Fig. 1F, G View Fig ) slender; ischium 0.78 of merus length; merus 1.12 of carpus length; carpus 0.55 length of chela; palm 0.40 of chela length; dactylus, 1.46 of palm length, 0.59 of chela length; cutting edge of fingers almost smooth, not gaping. Female (RUMF- ZC-2664): second pereiopods ( Fig. 2C, D, E View Fig ) moderately slender, similar in form, equal in length; surface of dactylus to ischium covered with sparsely minute spinules and setose; ischium 0.72–0.75 of merus length; merus 1.14–1.16 of carpus length; carpus 0.55–0.56 length of chela; palm 0.39 of chela length; dactylus 1.60–1.61 of palm length, 0.62 of chela length; cutting edge of fingers not gaping, with very low, blunt teeth on proximal margins.

Remarks. Macrobrachium miyakoense   was originally described from two young males (pocl 14.70 mm and 12.60 mm). The present full-grown specimens are similar in morphology to the type specimens, but some adult characters differ markedly. We have therefore amended the original description of Komai & Fujita (2005) accordingly and provided new figures.

Kingdom

Animalia

Phylum

Arthropoda

Class

Malacostraca

Order

Decapoda

Family

Palaemonidae

Genus

Macrobrachium

Loc

Macrobrachium miyakoense Komai & Fujita, 2005

Fujita, Yoshihisa, Davie, Peter J. F. & Ng, Peter K. L. 2015
2015
Loc

Macrobrachium miyakoense

De Grave S & Fransen CHJM 2011: 327
Komai T & Fujita Y 2005: 14
2005