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.