Euryrhynchus tomasi De Grave 2007
Creators: name: Pachelle, Paulo P. G.
name: Tavares, Marcos
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Decapoda
Euryrhynchidae
Euryrhynchus
Euryrhynchus tomasi

description: Euryrhynchus tomasi De Grave, 2007
(Figs. 1E, 44B, 45–49, 65A)
Euryrhynchus tomasi De Grave, 2007: 194, figs. 1–7.
Euryrhynchus tomasi — De Grave & Fransen 2011: 309; Pimentel & Magalhães 2014: 1302, fig. 2 [as E. burchelli Calman, 1907, partim].
Material examined. Holotype: ♂ (cl 5.0 mm), NHM 2007.62, French Guiana, Cayenne, Ouanary, 20 km northwest of St Georges de l’Oyapock, Crique Timothy, approximately 04°00'N 51°52'W, coll. J. Tomas, 29.iii.2006.
Paratype: 1♀ (cl 6.5 mm), NHM 2007.63, same collection data as for the holotype. Additional material: French Guiana: 1♂ (cl 4.1 mm), 1♀ (cl 5.0 mm), OUMNH.ZC.2015-02-007, Cayenne, Kourou, 15 km south of Kourou city, Montagne des Singes, 05.0718°N 52.6928°W, coll. O. Helke, 2012. Brazil: 8♂ (cl 5.1–4.0 mm), 2♀ (cl 4.9, 4.5 mm), 9♀ ov (cl 5.2– 4.6 mm), MZUSP 22766, Amapá, northwest of Amapá city, Vilarejo e Balneário Cachoeira Grande, in cave, 02°09'52.2''N 50°55'22.8''W, in submerged leaflitter, coll. J.M. Cunha & J. Zuanon, 06.iii.2007; 1♂ (cl 4.2 mm), 1♀ov (cl 5.0 mm), OUMNH.ZC.2016-01-028, same collection data as previous lot; 2♂ (cl 3.2, 2.5 mm), 6♀ (cl 4.2– 2.6 mm), INPA 1082, Amapá, north of Amapá city, Rio Amapá Grande, Cachoeira Grande, small igarapé downstream, coll. C. Magalhães & Roberval, 26.viii.1992.
Type locality. Crique Timothy, 20 km northwest of St Georges de l’Oyapock, Ouanary, Cayenne (French Guiana).
Distribution. French Guiana (Cayenne) and Brazil (Amapá) (De Grave 2007; present study) (Fig. 65A, green circles).
Description. De Grave (2007), figs. 1–7. The Brazilian material is illustrated on Figs. 45–49.
Remarks. Euryrhynchus tomasi resembles E. burchelli in having the second pereopod merus with a pair of spines on the distoventral angles (Figs. 25D, 46D), the third to fifth pleopods of female with appendix interna (Figs. 29I –K, 48I –K), and the gonopods elongated, straight (Figs. 29B, C, 30, 48B, C, 49). However, E. tomasi can be easily recognized by (i) the second pereopod carpus with distomesial angle unarmed, smooth, Fig. 46D (versus second pereopod carpus with 1 subdistal spine on the distomesial angle in E. burchelli, Fig. 25D), (ii) the second pereopod provided with fine granules at least on the surface of carpus and propodus, Fig. 46 (versus second pereopod without fine granules on surface of articles in E. burchelli, Fig. 25), and (iii) the fourth thoracic sternite with transversal ridge produced into prominent, triangular lobe medially, Fig. 45D (versus fourth thoracic sternite with transversal ridge produced into low, broad lobe medially in E. burchelli, Fig. 24D). According to De Grave (2007) the second to fifth pleopods lack appendix interna in the females. However, all female specimens examined during the present study, including the female paratype, do actually have appendix interna on the third to fifth pleopods (Fig. 48I –K).
Pimentel & Magalhães (2014) reported three lots of E. burchelli from Amapá, Brazil (INPA 1082; IEPA 0 0 27, 0050). However, the specimens of the lot INPA 1082 actually belong to E. tomasi (see remarks under E. burchelli), thus representing the first finding of the species in the Brazilian Amazon.
description: Published as part of Pachelle, Paulo P. G. & Tavares, Marcos, 2018, The freshwater shrimp family Euryrhynchidae Holthuis, 1950 (Crustacea: Decapoda: Caridea) revisited, with a taxonomic revision of the genus Euryrhynchus Miers, 1878 in Zootaxa 4380 (1) on pages 65-72, DOI: 10.11646/zootaxa.4380.1.1, http://zenodo.org/record/1175650