Macrobrachium ferreirai Kensley & Walker, 1982

Fig. 10 A–C

Macrobrachium ferreirai Kensley & Walker, 1982: 4 .

Macrobrachium ferreirai, Magalhães & Walker, 1988: 288 .— Melo, 2003: 352.

Material examined.

Amazonas: Leticia. Corregimiento La Pedrera, Angostura 120 - 130 m asl, 11 - 12 Nov 1994, leg. M. R. Campos, 31 males, 31 females, 5 ovigerous, ICN-MHN-CR 1406, 1416.— Corregimiento La Pedrera, Yupatí Hill, Comeyafú Community, Guacaperiyá stream, 120 m asl, 7 Nov 1994, leg. M. R. Campos, 11 males, 7 females, 2 ovigerous, ICN-MHN-CR 1394.— Corregimiento La Pedrera, Yupatí Hill, Quebradón del Tío Ramón, 180 m asl, 11 Nov 1994, leg. M. R. Campos, 13 males, 22 females, 5 juveniles, ICN-MHN-CR 1404.— Corregimiento La Pedrera, Chorro de Córdoba, Amerú stream, 120 m asl, 8 Nov 1994, leg. M. R. Campos, 28 males, 32 females, 6 ovigerous, ICN-MHN-CR 1397.— Corregimiento La Pedrera, La Tonina stream, 120 m asl, 6 Nov 1994, leg. M. R. Campos, 4 males, 1 ovigerous female, ICN-MHN-CR 2190.— Corregimiento La Pedrera, Makuna Community, Centro Providencia, 180 m asl, 14 Nov 1994, leg. M. R. Campos, 44 males, 30 females, 4 ovigerous, ICN-MHN-CR 1421, 1424.— Corregimiento La Pedrera, Mirití River, El Puerto, 180 m asl, 16 Nov 1994, leg. M. R. Campos, 10 males, 12 females, 3 ovigerous, ICN-MHN- CR 1434.— Corregimiento La Pedrera, Mirití River, 1 km from Puerto Lago, 150 m asl, 19 Nov 1994, leg. M. R. Campos, 9 males, 13 females, 1 ovigerous, ICN-MHN-CR 1441.— Corregimiento La Pedrera, Mirití River, Puerto Lago, 170 m asl, 17 Nov 1994, leg. M. R. Campos 34 males, 34 females, 12 ovigerous, ICN- MHN-CR 1436.— Corregimiento La Pedrera, Mirití River, Puerto Lago, Yukuna Community, 160 - 170 m asl, 19 Nov 1994, leg. M. R. Campos, 28 males, 28 females, 2 ovigerous, ICN-MHN-CR 1440, 1442.— Corregimiento La Pedrera, Tamaritagua Community, 120 - 150 m asl, 10 - 12 Nov 1994, leg. M. R. Campos, 9 males, 5 females, 2 ovigerous, ICN-MHN-CR 1407, 2191, 2193.— Corregimiento La Pedrera, Tamaritagua Community, El Remanso stream, 120 m asl, 12 Nov 1994, leg. M. R. Campos, 20 males, 33 females, 8 ovigerous, ICN-MHN-CR 1414.— Corregimiento La Pedrera, Tamaritagua Community, La Tonina stream, 120 m asl, 12 Nov 1994, leg. M. R. Campos, 3 males, ICN-MHN-CR 2192. — Mirití-Paraná River, Dec 1980, leg. T. Walshbursen 17 males, 10 females, CRBMUV 80170.

Casanare: Without precise locality, 19 Feb 1974, leg. P. Cala, 1 male, ICN-MHN-CR 2189.

Vaupés: Taraira, Reserva Natural Caparú, 150 m asl, 23 Nov 1994, leg. M. R. Campos, 19 males, 24 females, 5 ovigerous, ICN-MHN-CR 1445, 1446.

Diagnosis

Rostrum nearly straight, distal portion slightly curved downward, overreaching with distal portion scaphocerite, upper margin with 9 to 14 teeth regularly spaced, including 2-4 teeth completely post orbital, lower margin 1 to 4 teeth; carapace smooth; abdomen slightly pubescent; telson terminal margin ending with sharp midpoint, flanked by two pairs of spinules, internal pair overreaching midpoint and external pair. First pair of pereopods overreaching scaphocerite with 1/2 of carpus. Second pair of pereopods elongated, similar in shape and size, covered with spines, which are more conspicuous on ventral surface of palm and fingers, overreaching with 2/3 of merus scaphocerite; merus 0.62 to 0.64 x carpus length, 0.44 to 0.47 x palm length; carpus 5.81 to 7.48 x as long as wide, and 0.68 to 0.76 x palm length; palm cylindrical, 9.10 to 10.17 x as long as wide; fingers slightly gaping when closed, 0.40 to 0.43 x palm length, mobile finger on mid-proximal portion of cutting edge with 2 to 4 teeth, which diminishing in size to base of finger, fixed finger with a prominent tooth on proximal portion, followed by 3 denticles to its base.

Size. The largest male TL 62.9 mm, CL 19.2 mm; the largest female TL 45.4 mm, CL 12.7 mm; 51 ovigerous females were examined: TL 28.5 to 45.4 mm, CL 7.9 to 12.7 mm, with large and few number of eggs.

Remarks

These are the first records of Macrobrachium ferreirai for Colombia. This species is most similar to Macrobrachium brasiliense (Heller, 1862) . The two can be distinguished by features of the carapace and the second pair of pereopods in adult males. The anterolateral portion of the carapace in M. ferreirai is smooth; whereas it is covered in spinules in M. brasiliense . The second pair of pereopods in M. ferreirai is more slen- der than in M. brasiliense, the palm in M. brasiliense is less or equal to 6.3 times as long as wide; in contrast in M. ferreirai it is more than 9.0 times as long as wide; the fingers in M. brasiliense are 0.45 times or more the palm length, whereas in M. ferreirai they are less than 0.45 times the palm length.