Macrobrachium callirrhoe (De Man 1898)

Macrobrachium callirrhoe (De Man, 1898)

Palaemon (Macrobrachium) callirrhoe De Man, 1898:152, pl. 8 [type locality: Sungai Mandai and Sungai Ketungau, central Borneo].

DIAGNOSIS.—Rostrum reaching level of distal end of antennal scale, dorsal margin nearly straight, faintly convex, rostral formula: 3–4 + 6–7/2–3, dorsal teeth subequally spaced; branchiostegal suture not extending posteriorly beyond hepatic spine; telson with posterior apex not overreaching posterolateral spines; antennal scale with lateral margin slightly convex; 1st pereopod with chela as long as carpus; 2nd pereopods somewhat unequal in length, similar in form; major 2nd pereopod with palm slightly compressed, fingers and palm not concealed by dense pubescence, fingers dentate on opposable margins, slightly gaping, shorter than palm, chela less than 3 times as long as carpus, palm less than 1 times as long as carpus, carpus shorter than merus, without longitudinal grooves; minor 2nd pereopod with fingers about as long as palm; 3rd pereopod with propodus not covered with spines or scales; maximum postorbital carapace length less than 10 mm.

RANGE.—Known only from the type series from two rivers in central Borneo.

ETYMOLOGY.—The specific name of this species was undoubtedly transliterated from the name assigned to any of three different women in Greek mythology or to a famous spring in Athens. Whatever the connotation, the apparently commonest spelling of the name was the one used by DeMan and repeated here: Callirrhoe.