Palaemon yuna Carvalho, Magalhães & Mantelatto, 2014

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 : 29

Palaemon yuna Carvalho, Magalhães & Mantelatto, 2014 ( Figs 4E, F, 11)

Identification characters ( Fig. 4E, F). Rostrum slender, slightly curved upwards distally, overreaching distal margin of scaphocerite; rostral formula: 6–10(1 post-orbital tooth)/2–5. First antennular segment with projection of its anterolateral margin reaching the distal margin of second segment; anterolateral spine of first antennular segment not overreaching one third of the projection of the anterolateral margin.Carapace smooth, with antennal and branchiostegal teeth present, branchiostegal suture situated between both teeth; abdomen with pleura of second somite enlarged and overlapping pleuron of first and third somites. Telson with posterior margin distinct, ending in a small acute point, overreached by inner pair of posterolateral spines. P2 similar in shape and size, overreaching scaphocerite with approximately half of the distal part of carpus.

Material examined. 1 male, 1 female ( MIRR 83), Boa Vista, BR 174 road between Boa Vista and Mucajaí, 02°46ʹ08.53ʺ N, 060°39ʹ22.63ʺ W, 28-II-2007, colls. L.F. R. Guterres, P.M. Castro and J.C.P. Mota; 2 spec. ( INPA 2408), Caracaraí, Parque Nacional do Viruá [01°48ʹ51.28ʺ N, 061°08ʹ04.18ʺ W], 13-VII-2008, coll. J.D. do Vale; 2 males ( MIRR 2385), Caracaraí, Terra Preta, igarapé Marixi, tributary of rio Xeriuini, tributary of rio Branco, 00°50ʹ52.916ʺ N, 061°57ʹ51.778ʺ W, 09-VI-2013, coll. F.C. Zanetti; 1 male ( INPA 2352), Rorainópolis, igarapé on vicinal 20, tributary of rio Jauaperi, Colinas, 00°37ʹ16.7ʺ N, 060°29ʹ53.9ʺ W, 21-XII-2014, colls. M.A.L. Santos, B.C.A. Santos and N.L. Ferreira; 1 male, 2 females ( INPA 2326), Caracaraí, Terra Preta, rio Xeriuni, 00°33ʹ54.731ʺ N, 061°57ʹ9.945ʺ W, 25-III-2014, colls. M.A.L. Santos e F.C. Zanetti; 1 female ( INPA 2303), Caracaraí, Caicubí, igarapé Caicubi, tributary of rio Branco, 01°0ʹ52.221ʺ S, 62°6ʹ15.601ʺ W, 06-IX-2011, colls. P.M. Castro and A.A. Otaviano.

Distribution. Brazil (Amazonas, Roraima [new record]) ( Carvalho et al. 2014; this study). The distribution in Roraima is depicted in Figure 11.

Remarks. The morphology of our specimens agrees with the description provided by Carvalho et al. (2014).

Until recently, Palaemon carteri ( Gordon, 1935) was considered to be distributed in the Negro River basin ( Magalhães and Pereira 2007). However, in a study on the morphological and molecular differentiation of two species of Palaemon from the Amazon basin, Carvalho et al. (2014) concluded that the populations distributed in the Negro River basin were distinct and described a new species, Palaemon yuna , from this basin. The records presented herein indicate that the distribution of this species also encompasses the Branco River basin.