Macrobrachium horstii (De Man 1892)

Macrobrachium horstii (De Man, 1892)

Palaemon (Parapalaemon) Horstii De Man, 1892:460, pl. 27: fig. 39 [type locality: River at Polopo, central Celebes].

Palaemon (Parapalaemon) horsti brevidigitus J. Roux, 1930:358 [type locality: Bali].

Macrobrachium horstii.—Holthuis, 1950a:203, fig. 42.

DIAGNOSIS.—Rostrum not reaching level of distal margin of antennal scale, dorsal margin moderately convex, rostral formula: 4 + 8/2–3, 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 straight; 1st pereopod with chela more than as long as carpus; 2nd pereopods subequal in length, similar in form, palm somewhat compressed, fingers and palm spinulose, not pubescent, fingers with teeth on opposable margins, not broadly gaping, – as long as palm, chela less than twice as long as carpus, palm 1–1 times as long as carpus, carpus slightly longer than merus, without longitudinal grooves; 3rd pereopod overreaching antennal scale by about length of dactyl; maximum carapace length about 20 mm.

RANGE.—Taiwan and Celebes, Bali, and Lombok, Indonesia.

*20. Macrobrachium idae (Heller, 1862)

P[alaemon] Idae Heller, 1862b:416, pl. 2: figs. 40, 41 [type locality: Borneo].

Palaemon (Eupalaemon) ritsemae De Man, 1897:774 [type locality: Atjeh, northwestern Sumatra].

P[alaemon] (Eupalaemon) Idae, var. subinermis Nobili, 1899:237 [type locality: San Guiseppe River near Innawi, Meheo District, Papua].

Palaemon (Eupalaemon) Mariae Coutière. 1900:1266 [type locality: Madagascar].

Palaemon (Eupalaemon) robustus De Man, 1902:771, pl. 24: fig. 48 [type locality: Halmahera].

Macrobrachium idae.—Holthuis, 1950a:142, fig. 33.

?Macrobrachium palawanensis Johnson, 1962a:307, fig. 1 [type locality: Palawan, Philippines].

?Macrobrachium palawanense.—Johnson, 1973:274, 282.

DIAGNOSIS.—Rostrum reaching nearly as far as or slightly beyond level of distal end of antennal scale, dorsal margin straight or faintly sinuous, rostral formula: 2–3 + 6–9/3–4, dorsal teeth rather 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 less than 3 times as long as carpus; 2nd pereopods similar in form but not usually equal in length, palm subcylindrical, fingers pubescent, especially either side of proximal part of opposable margins, latter dentate proximally, fingers not noticeably gaping, as long as palm, latter naked, chela shorter than carpus, palm more than as long as carpus, carpus more than twice as long as merus, without longitudinal grooves; 3rd pereopod overreaching antennal scale by more than length of dactyl, propodus not covered with spines or scales; maximum postorbital carapace length about 20 mm.

MATERIAL.—PHILIPPINES. Naujan River, Mindoro; [13°16′N, 121°19′E]; 5 Jun 1908: 1 male [16.9].

RANGE.—Madagascar to southern India, Philippines, Indonesia, and eastward as far as the Admiralty Islands.