Macrobrachium panamense Rathbun, 1912

Valencia, Diego M. & Campos, Martha R., 2007, Freshwater prawns of the genus Macrobrachium Bate, 1868 (Crustacea: Decapoda: Palaemonidae) of Colombia, Zootaxa 1456, pp. 1-44 : 28-29

Macrobrachium panamense Rathbun, 1912

Fig. 15 A–C

Material examined

Cauca: Guapi, Temuey, Guapi River, 50 m asl, 24 Oct 2004, leg. D. M. Valencia & M. R. Campos, 3 males, 12 females, 4 ovigerous, ICN-MHN-CR 2187.

Chocó: Bajo Baudó, Ensenada Catripe, 22 May 2005, leg. C. Rincón, 2 ovigerous females, ICN-MHN- CR 2263.— Palestina, Calima - San Juan Rivers, 20 m asl, 18 Mar 1990, leg. G. Galvis, 2 females, 25 juveniles, ICN-MHN-CR 1196.

Valle del Cauca: Buenaventura. Veneno creek, 13 Nov 1981, 2 males, 5 females, 3 ovigerous, CRBMUV 81085.— Bahía Málaga, 10 Mar 1980, 2 males, 2 females, CRBMUV 80003.— Buenaventura Bay, Piangüita, 16 Apr 2004, leg. R. Neira 1 male, 6 females, 16 juveniles, CRBMUV 004001.— Dagua River mouth, 0.60 m deep, 4 Jun 1983, 1 male, 4 females, 1 ovigerous, CRBMUV 83038.

Diagnosis

Rostrum sinuous, straight on orbit region, distal portion directed upward, overreaching scaphocerite, upper margin with 10 to 12 teeth, including 2 teeth completely post orbital, proximal teeth with less recess between them than distal ones, lower margin 6 to 9 teeth; carapace smooth; abdomen smooth; telson terminal margin ending in sharp midpoint, flanked by two pairs of spinules, internal pair overreaching external pair, and overreaching or not the midpoint of telson. First pair of pereopods overreaching scaphocerite with chelae. Second pair of pereopods elongated, slender, similar in shape and size, with longitudinal rows of spinules, overreaching scaphocerite with 1/2 of carpus; merus 0.61 to 0.74 x carpus length, and 1.09 to 1.36 x palm length; carpus 0.72 to 1.18 x chela length; fingers not gaping when closed, slightly pubescent, 0.85 to 1.08 x palm length, a tooth on proximal portion in each cutting edge of fingers.

Size. The largest male TL 86.3 mm, CL 19.8 mm; the largest female TL 88.5 mm, CL 19.3 mm; 10 ovigerous females were examined: TL 57.5 to 97.8 mm, CL 13.8 to 21.3 mm, with small and numerous eggs.

Remarks

This species is most similar to Macrobrachium amazonicum ( Heller, 1862) . The two can be distinguished by differences in the rostrum. The rostrum in M. amazonicum is lower and strongly convex on the orbital region; in contrast, it is high and slightly convex on the orbital region in M. panamense .

Figures

FIGURE 15. Macrobrachium panamense Rathbun, 1912, male, CRBMUV 81085: A, anterior part of body, lateral view; B, telson, dorsal view; C, second pereopod, lateral view.