Macrobrachium miyakoense Komai & Fujita, 2005: 14 De Grave & Fransen, 2011: 327 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) Fujita, Yoshihisa Davie, Peter J. F. Ng, Peter K. L. Raffles Bulletin of Zoology 2015 2015-12-25 63 610 625  Komai & Fujita, 2005: 14  0a2a6558-1f89-4fcb-8d65-6662adf732ac Komai & Fujita, 2005 Komai & Fujita 2005 [142,724,1373,1397] Malacostraca Palaemonidae Macrobrachium GBIF Animalia Decapoda 2 612 Arthropoda species miyakoense  ( Figs. 1–3)     Macrobrachium miyakoense–  Komai & Fujita, 2005: 14;  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;  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, 2A) 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, 2B) 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) 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) 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) 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 miyakoensewas originally described from two young males (pocl 14.70 mmand 12.60 mm). The present full-grown specimens are similar in morphology to the typespecimens, but some adult characters differ markedly. We have therefore amended the original description of Komai & Fujita (2005)accordingly and provided new figures. 2009-09-15 Y. Fujita Japan Ryukyu Islands 24.720528 Ueno Ana-ga Cave 1 125.32208 Miyako Island 2 612 1 1 2010-08-15 Y. Fujita Japan Ryukyu Islands Ueno Ana-ga Cave Miyako Island 2 612 1 1