Macrobrachium esculentum (Thallwitz 1891)

Macrobrachium esculentum (Thallwitz, 1891)

Palaemon esculentus Thallwitz, 1891:98 [type locality: northern Celebes].

Palaemon dulcis Thallwitz, 1891:99 [type locality: northern Celebes].

Macrobrachium esculentum.—Holthuis, 1950a:257.

DIAGNOSIS.—Rostrum not reaching level of distal end of antennal scale, rostral formula: 5–6 + 7–8/2; 1st pereopod with chela more than as long as carpus; 2nd pereopods unequal in length and dissimilar in form; major 2nd pereopod with palm compressed, fingers not covered with dense pubescence, dentate on opposable margins, gaping, longer or shorter than palm, latter entirely covered with woolly hairs, chela longer than carpus, palm longer than carpus, carpus shorter than merus, without longitudinal grooves; minor 2nd pereopod with fingers longer than palm; maximum postorbital carapace length less than 25 mm.

RANGE.—Known with certainty only from northern Celebes; reported from Thailand and the Philippines.

*16. Macrobrachium gracilirostre (Miers, 1875)

Palaemon gracilirostris Miers, 1875:343 [type locality: Upolu, Samoa Islands].

Palaemon (Parapalaemon) modestus De Man, 1892:469, pl. 27: fig. 43 [type locality: River at “Wukur,” not far from Sika, southeastern Flores, Indonesia; not P. modestus Heller, 1862a].

Palaemon (Parapalaemon) modestus brevimanus J. Roux, 1934a:228, figs. 9, 10 [type locality: Bimun, New Ireland].

Macrobrachium sophronicum Holthuis, 1950a:198, fig. 40 [type locality: “Wukur River,” Sika, southeastern Flores, Indonesia].

Macrobrachium gracilirostre.—Holthuis, 1959:199.

DIAGNOSIS.—Rostrum not reaching level of distal end of antennal scale, dorsal margin nearly straight, faintly convex or sinuous, rostral formula: 5–6 + 3–4/2, dorsal teeth more widely spaced anteriorly; branchiostegal suture not extending posteriorly beyond hepatic spine; telson with posterior apex not overreaching posterolateral spines; antennal scale with lateral margin straight; 1st pereopod with chela less than as long as carpus; 2nd pereopods subequal in length and similar in form, with fingers naked except for scattered setae, opposable margins dentate, not gaping noticeably, as long as palm, palm without dense pubescence, chela about 1 times as long as carpus, palm subequal to carpus in length, carpus longer than merus, without longitudinal grooves; 3rd pereopod overreaching antennal scale by length of dactyl and of propodus, latter covered with appressed scales; maximum carapace length about 25 mm.

MATERIAL.—PHILIPPINES. Malaga River, Hinunangan Bay, Leyte; [10°24′N, 125°12′E]; 30 Jul 1909: 3 males [14.0–18.0].

RANGE.—Previously known from the Ryukyu Islands, Taiwan, the Moluccas, Lesser Sunda Islands, New Ireland, and Fiji and Samoa islands. Apparently the species has not been recorded before from the Philippines.