Euryrhynchus tomasi De Grave, 2007

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, Zootaxa 4380 (1): 65-72

publication ID

https://doi.org/10.11646/zootaxa.4380.1.1

publication LSID

lsid:zoobank.org:pub:9DC29ECD-8C44-4F42-BA0E-9B0C830A7C73

DOI

http://doi.org/10.5281/zenodo.5694253

persistent identifier

http://treatment.plazi.org/id/03D987F9-FFFA-8508-A4D4-F4A163F6B9A3

treatment provided by

Plazi

scientific name

Euryrhynchus tomasi De Grave, 2007
status

 

Euryrhynchus tomasi De Grave, 2007  

( Figs. 1E View FIGURE 1 , 44B View FIGURE44 , 45–49 View FIGURE 45 View FIGURE 46 View FIGURE 47 View FIGURE 48 View FIGURE 49 , 65A View FIGURE 65 )

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 View Materials , 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. GoogleMaps  

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 GoogleMaps   : 8♂ (cl 5.1–4.0 mm), 2♀ (cl 4.9, 4.5 mm), 9♀ ov (cl 5.2– 4.6 mm), MZUSP 22766 View Materials , 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 GoogleMaps   ; 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 View Materials , 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 View FIGURE 65 , green circles).

Description. De Grave (2007), figs. 1–7. The Brazilian material is illustrated on Figs. 45–49 View FIGURE 45 View FIGURE 46 View FIGURE 47 View FIGURE 48 View FIGURE 49 .

Remarks. Euryrhynchus tomasi   resembles E. burchelli   in having the second pereopod merus with a pair of spines on the distoventral angles ( Figs. 25D View FIGURE25 , 46D View FIGURE 46 ), the third to fifth pleopods of female with appendix interna ( Figs. 29I –K View FIGURE 29 , 48I –K View FIGURE 48 ), and the gonopods elongated, straight ( Figs. 29B, C View FIGURE 29 , 30 View FIGURE 30 , 48B, C View FIGURE 48 , 49 View FIGURE 49 ). However, E. tomasi   can be easily recognized by (i) the second pereopod carpus with distomesial angle unarmed, smooth, Fig. 46D View FIGURE 46 (versus second pereopod carpus with 1 subdistal spine on the distomesial angle in E. burchelli   , Fig. 25D View FIGURE25 ), (ii) the second pereopod provided with fine granules at least on the surface of carpus and propodus, Fig. 46 View FIGURE 46 (versus second pereopod without fine granules on surface of articles in E. burchelli   , Fig. 25 View FIGURE25 ), and (iii) the fourth thoracic sternite with transversal ridge produced into prominent, triangular lobe medially, Fig. 45D View FIGURE 45 (versus fourth thoracic sternite with transversal ridge produced into low, broad lobe medially in E. burchelli   , Fig. 24D View FIGURE 24 ). 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 View FIGURE 48 ).

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.

NHM

United Kingdom, London, The Natural History Museum [formerly British Museum (Natural History)]

INPA

Instituto Nacional de Pesquisas da Amazonia

IEPA

Istituto di Entomologia Agraria dell'Universita

Kingdom

Animalia

Phylum

Arthropoda

Class

Malacostraca

Order

Decapoda

Family

Euryrhynchidae

Genus

Euryrhynchus

Loc

Euryrhynchus tomasi De Grave, 2007

Pachelle, Paulo P. G. & Tavares, Marcos 2018
2018
Loc

Euryrhynchus tomasi

De Grave 2007: 194
2007
Loc

Euryrhynchus tomasi

De Grave 2007
2007
Loc

E. burchelli

Calman 1907
1907