Macrobrachium olfersii Wiegmann 1836

Macrobrachium olfersii (Wiegmann, 1836) Fig. 14 A���D Palaemon olfersii Wiegmann, 1836: 150. Macrobrachium olfersii, Escobar, 1979: 118.��� Williams, 1984: 70.��� Abele & Kim, 1989: 10.��� Nizinski, 2003: 103. Macrobrachium olfersi, Holthuis, 1952: 95.��� Mart��nez, 1973: 7.��� Rodr��guez, 1980: 120.��� Rodr��guez, 1981: 45, 47.��� Melo, 2003: 366. (For detailed synonymy refer to Holthuis, 1952). Material examined. Magdalena: Santa Marta. Buritaca, 20 m asl, 17 Nov 1998, leg. R. Casallas & A. J. Bernal, 9 males, 2 females 1 ovigerous, 1 juvenile, MLS 18.��� SW, Guachaca River, 10 - 30 m asl, Dec 1993, leg. R. Contreras, 1 male, 10 juveniles, CRBMUV 93005. ��� Parque Nacional Natural Tayrona, Gayraca stream, 1 male, INV 771.��� Parque Nacional Natural Tayrona, Nenguange, 2 males, 1 ovigerous female, INV 773, 979.��� Mamatoco stream, 18 Feb 1976, 3 males, 10 females, 5 ovigerous, INV 772.��� Mamatoco stream, 18 Mar 1976, leg. G. Manjarr��z, 5 males, 1 ovigerous female, INV 975. La Guajira: Riohacha. Rancher��a River, 40 m asl, 7 Oct 2004, Leg. C. Castellanos, 5 males, 3 ovigerous females, ICN-MHN-CR 2209. Diagnosis Rostrum nearly straight, distal part slightly recurved downward, shorter than scaphocerite, as long as antennular peduncle; upper margin with 11 to 14 teeth regularly spaced, including 4-5 teeth completely post orbital, lower margin with 2 to 4 teeth; carapace smooth; abdomen smooth; telson terminal margin ending in sharp midpoint, flanked by two pairs of spinules, inner pair overreaching midpoint and external pair. First pair of pereopods overreaching scaphocerite with distal portion of carpus. Second pair of pereopods prominent, different in shape and size, covered with conspicuous spines and long setae, the larger second pereopod overreaching scaphocerite with ca. 1 / 4 of merus; merus 0.94 to 0.95 x carpus length, and 0.72 to 0.95 x palm length; carpus 2.45 to 2.57 x as long as wide, and 0.76 to 1.0 x palm length; palm prominent with ventral margin convex, external and internal surfaces with rows of spines and conspicuous setae, ventral margin with row of spines which are decreasing in size distally, 2.61 to 3.15 x as long as wide; fingers gaping when closed, thickly pubescent in recess, 0.91 to 1.04 x palm length, cutting edge of each finger with a tooth on midproximal portion, followed by denticles to its distal portion. Size. The largest male TL 88.9 mm, CL 29.4 mm; the largest female TL 62.3 mm, CL 17.6 mm; 11 ovigerous females were examined: TL 36.7 to 50.0 mm, CL 9.6 to 14.9 mm, with small and numerous eggs. Remarks This species is closely related to Macrobrachium faustinum (De Saussure, 1857). The two can be distinguished by differences in the second pair of pereopods in adult males. The spines of the ventral margin���s row of the palm in M. faustiunum are larger proximal and distally but smaller on the midportion; to the contrary, they diminish in size distally in M. olfersii. In addition, the spines and pubescence on the external and internal surface of the palm and on the cutting edge of the fingers are more conspicuous in M. olfersii than in M. faustiunum. Some specimens of Macrobrachium olfersii were found at INCODER collection: 4 males, the largest male was LT 72.0 mm, CL 24.4 mm. These specimens were not recorded in this article because they lack location data. They may correspond to specimens reported by Mart��nez (1973) and deposited at INCODER. The male of Macrobrachium olfersii, from Santa Marta, Parque Nacional Natural Tayrona, Los Cedros, department of Magdalena (ICN-MHN-CR 0532), reported by Galvis (1986) are actually M. crenulatum.
Published as part of Valencia, Diego M. & Campos, Martha R., 2007, Freshwater prawns of the genus Macrobrachium Bate, 1868 (Crustacea: Decapoda: Palaemonidae) of Colombia, pp. 1-44 in Zootaxa 1456 on pages 27-28, DOI: 10.5281/zenodo.176325
{"references":["Wiegmann, A. F. (1836) Beschreibung einiger neuen Crustaceen des Berliner Museums aus Mexico und Brasilien. Archiv fur Naturgeschichte, 2, 145 - 151.","Escobar, J. G. (1979) Carideos (Palaemonidae y Atyidae) en los rios de la region de Santa Marta. Anales del Instituto de investigaciones Marinas de Punta de Betin, 11, 97 - 133.","Williams, A. B. (1984) Shrimps, Lobster and Crabs of the Atlantic Coast of the Eastern. United States, Maine to Florida. Smithsonian Institution Press, 1 - 550.","Abele, L. G. & Kim, W. (1989) The decapod crustaceans of the Panama Canal. Smithsonian Contributions to Zoology, 482, 1 - 50.","Nizinski, M. S. (2003) Annotated checklist of decapod crustaceans of Atlantic coastal and continental shelf waters of the United Estates. Proceedings of the Biological Society of Washington, 116, 96 - 157.","Holthuis, L. B. (1952) A general revision of the Palaeminidae (Crustacea: Decapoda: Natantia) of the Americas. II. the subfamily Palaemoninae. Allan Hancock Foundation Publications, Occasional Papers, 12, 1 - 396.","Martinez, L. E. (1973) Distribucion biogeografica de camarones de agua dulce del genero Macrobrachium Bate, 1868 (Crustacea, Palaemonidae) en el norte de Colombia. Divulgacion Pesquera, 4, 1 - 12.","Rodriguez, G. (1980) Crustaceos decapodos de Venezuela. Instituto Venezolano de Investigaciones Cientificas, Ed. Caracas, 1 - 494.","Rodriguez, G. (1981) Decapoda. In: Hurlbert, S. H., Rodriguez, G. & Santos, N. D. (Eds.) Acuatic Biota of Tropical South America, Part I: Arthropoda. San Diego State University, San Diego, California, 41 - 51.","Melo, G. A. S. (2003) Familias Atydae, Palaemonidae e Sergestidae. In: Manual de identificacao dos Crustacea Decapoda de agua doce do Brasil. Loyola Edit, Sao Paulo, 289 - 415.","Saussure, H. de (1857) Diagnoses de quelques crustaces nouveaux de l'Amerique tropicale. Revue et Magazin de Zoologie Pure et Appliquee, series 2, 9, 501 - 505.","Galvis, G. (1986) Fauna dulceacuicola del Parque Tayrona. Caldasia, 15, 445 - 450."]}