Macrobrachium nattereri (Heller, 1862)

Santos, Maria Aparecida Laurindo dos, Castro, Patrícia Madedo de & Magalhães, Célio, 2018, Freshwater shrimps (Crustacea, Decapoda, Caridea, Dendrobranchiata) from Roraima, Brazil: species composition, distribution, and new records, Check List (Washington, D. C.: 1974) 14 (1), pp. 21-35 : 28-29

Macrobrachium nattereri (Heller, 1862) ( Figs 4A–D, 10)

Previous records. Ramos-Porto and Coelho (1998, in list); Melo (2003, in list); Castro and Silva (2013).

Identification characters ( Fig. 4A–D). Rostrum straight, short, slightly directed downwards, reaching distal margin of scaphocerite; rostral formula: 8–11(2–3 post-orbital teeth)/1–4. Carapace with antennal and

hepatic spines present, anterolateral portion roughened by numerous spinules; abdomen also roughened by spinules, pleurae of second somite enlarged and overlapping pleuron of first and third somites. Telson with posterior margin distinct, ending in a small acute point, usually overreached by inner pair of posterolateral spines. P2 (larger cheliped) similar in shape, unequal in size; larger cheliped overreaching scaphocerite with large part of the length of carpus, palm pear-shaped in cross-section with distinct longitudinal sulcus on outer surface, fingers approximately 0.6 times the length of palm, with row of tubercles on cutting edges.

Material examined. 3 males ( INPA 2329), Pacaraima, igarapé Miang, tributary of rio Surumu, 04°29ʹ02.11ʺ N, 061°07ʹ51.0ʺ W, 13-VI-2014, colls. M.A.L. Santos, F.C. Zanetti and S.C. Emídio; 76 spec. ( INPA 2371), Pacaraima, igarapé Miang, tributary of rio Surumu, 04°29ʹ02.11ʺ N, 061°07ʹ51.0ʺ W, 10-III-2014, colls. R.E. Farias and F. R. Silva; 16 spec. ( INPA 2380), Pacaraima, igarapé Miang, tributary of rio Surumu, 04°29ʹ02.11ʺ N, 061°07ʹ51.0ʺ W, 24-I-2015, colls. F.C. Zanetti and S.C. Emídio; 4 males, 1 female ( INPA 2343), Pacaraima, BR 174 road, Campinho, igarapé Ávila, 04°26ʹ41.9ʺ N, 061°07ʹ31.1ʺ W, 27-X-1987, colls. V. Py-Daniel et al.; 2 males, 2 females ( INPA 2394), Amajari, igarapé Coimbra, tributary of rio Trairão, vicinal Bom Jesus, 03°37ʹ03.0ʺ N, 061°49ʹ46.5ʺ W, 18-IV-2015, colls. F.C. Zanetti, M.A.L. Santos and J. Santos; 1 female ( INPA 2373), Bonfim, rio Tacutu, 03°21ʹ14.8ʺ N, 059°49ʹ57.4ʺ W, 07-IV-2015, colls. F. C. Zanetti and S.C. Emídio; 1 male ( INPA 2339), Iracema, Hakoma, rio Tissipora-ú, tributary of rio Mucajaí, [02°57ʹ14.47ʺ N 061°35ʹ31.66ʺ W], 23-VIII- 1983, colls. V. Py-Daniel et al.; 1 female, 4 immat. spec. ( MIRR 64), Boa Vista, unnamed igarapé, tributary of rio Cauamé, 02°52ʹ51.90ʺ N, 060°40ʹ41.81ʺ W, 07-X-2010, colls. A.A. Otaviano, R. Serafim, F.C. Zanetti and D.A. Texeira; 3 males, 9 females (1 ovig.) ( INPA 2398), Alto Alegre, Xitei/Xidea, rio Parima, 02°36ʹ24ʺ N, 063°52ʹ17ʺ W, 20-VIII-1993, colls. V. Py-Daniel et al.; 6 males, 2 females ( INPA 2355), Cantá, igarapé near Serra Grande I, tributary of rio Branco, 02°33ʹ27.9ʺ N, 060°44ʹ53.9ʺ W, 08-XII-2007, colls. F.A.G. Melo, D. Maciel, J.C.P. Mota and D. Silva; 5 males ( INPA 2342), Alto Alegre, Homoxi, upper rio Mucajaí (Uxua-ú), tributary of rio Mucajaí, 02°29ʹ51ʺ N, 063°43ʹ47ʺ W, 25-VIII-1991, colls. V. Py-Daniel et al.; 14 males, 3 females ( INPA 2351), Mucajaí, Apiaú region, igarapé Perdido, tributary of rio Mucajaí, [02°26ʹ27.502ʺ N, 060°56ʹ17.059ʺ W], 19-IX- 2009, colls. D.A. Lima, E.A. Barbosa, C. R. Araújo, F.C. Zanetti and J.S. Tavares; 9 males, 1 female ( INPA 2391), São João da Baliza, vicinal 26, tributary of rio Jauaperi, 00°40ʹ N, 060°03ʹ W, 28-IV-2015, colls. M.A.L. Santos, F.C. Zanetti, P.M. Castro, S.C. Emídio and A. R. Lima.

Distribution. Venezuela, Colombia, French Guiana, Brazil (Amazonas, Amapá, Bahia, Ceará, Pará, Roraima), Peru (see Pimentel and Magalhães 2014 for references; present study). The distribution in Roraima is depicted in Figure 10.

Remarks. The morphology of our specimens agrees very well with the description provided by Holthuis (1952). Macrobrachium nattereri closely resembles M. brasiliense and M. ferreirai , and their juveniles and subadult specimens are very difficult to distinguish (Kensley and Walker 1992).

Ramos-Porto and Coelho (1998) and Melo (2003) listed M. nattereri as occurring in the state of Roraima, but without specifying the localities. The records presented here confirm its occurrence in Roraima ( Fig. 10).