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