Macrobrachium pilimanus (De Man 1879)

Macrobrachium pilimanus (De Man, 1879)

Palaemon pilimanus De Man, 1879:181 [type locality: Muaralabuh, near Padang, western Sumatra].

Palaemon pilimanus, var. leptodactylus De Man, 1892:476, pl. 28: fig. 44i–l [type locality: Bogor, Java].

Palaemon (Macrobrachium) pygmaeus J. Roux, 1928b:222, figs. 1–4 [type locality: “Kastobo” Lake, Pulau Bawean, Java Sea].

Macrobrachium pilimanus.—Holthuis, 1950a:214.

DIAGNOSIS.—Rostrum not reaching level of distal end of antennal scale, dorsal margin convex, rostral formula: 3–5 + 6–10/1–3, 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 straight; 1st pereopod with chela as long as carpus; 2nd pereopods unequal in length but rather similar in form; major 2nd pereopod with palm compressed, fingers with surfaces more or less concealed by long, soft hairs, dentate on opposable margins, not gaping, to quite as long as palm, much of latter covered by long, soft hairs, chela more than 5 times as long as carpus, palm 1 to more than twice as long as carpus, carpus – as long as merus, without longitudinal grooves; minor 2nd pereopod with fingers 1 times as long as palm; 3rd pereopod overreaching antennal scale by about length of dactyl, propodus not profusely spinose or scaly; maximum postorbital carapace length 28 mm.

RANGE.—Malaya, Sumatra, Java, and Borneo.

*39. Macrobrachium placidulum (De Man, 1892)

?Palaemon spinimanus Latreille, 1818:5, pl. 319: fig. 1 [type locality ?].

Palaemon (Macrobrachium) placidulus De Man, 1892:489, pl. 28: fig. 48 [type localities: Celebes, Pulau Selajar, Flores, and Timor].

Macrobrachium placidulum.—Holthuis, 1950a:253, fig. 51c.

DIAGNOSIS.—Rostrum not reaching level of distal end of antennal scale, dorsal margin convex, rostral formula: 4–6 + 5–7/1–2, dorsal teeth more widely spaced anteriorly than posteriorly; branchiostegal suture very short, not extending posteriorly beyond hepatic spine; telson with posterior apex not overreaching posterolateral spines; antennal scale with lateral margin concave; 1st pereopod with chela more than as long as carpus; 2nd pereopods unequal in length and somewhat dissimilar in form; major 2nd pereopod with palm compressed, fingers not clothed in dense pubescence, dentate on opposable margins, slightly gaping, –1 times as long as palm, palm without any dense pubescence, chela 1–2 times as long as as carpus, palm –1 times as long as carpus, carpus shorter than merus, without longitudinal grooves; minor 2nd pereopod with fingers – as long as palm; 3rd pereopod overreaching antennal scale by more than length of dactyl, propodus bearing rather numerous subacute scales; maximum postorbital carapace length less than 20 mm.

MATERIAL.—PHILIPPINES. Calawagan River, Mindoro, 3 miles from mouth, Mindoro; [13°25′N, 120°28′E]; 11 Dec 1908 (1500); 16′ seine: 1 male [15.0].—Yawa River, Legaspi, Luzon; [13°10′N, 123°45′E]; 7 Jun 1909 (0600): 5 males [7.7–11.1] 1 ovig female [8.8].—Malaga River, Hinunangan Bay, Leyte; [10°24′N, 125°12′E]; 30 Jul 1909: 3 males [12.0–13.5].—Zamboanga River, Mindanao; [6°54′N, 122°04′E]; 9 Oct 1909: 1 male [12.7].

RANGE.—This species seems not to have been recorded previously from the Philippines. It was known from eastern Indonesia from Makassar Strait to New Guinea, as well as from New Hanover in the Bismarck Archipelago, Palau, and Fiji.