Staurorhectus longicornis longicornis Giglio-Tos, 1897

Greco-Spíngola, Silvana, Jorge, Carolina & Lorier, Estrellita, 2020, Acridomorpha (Orthoptera) species associated with the protected wetlands of Santa Lucía, Montevideo, Uruguay, Check List 16 (3), pp. 597-610 : 606

Staurorhectus longicornis longicornis Giglio-Tos, 1897

Figure 4D

Materials examined. URUGUAY • 1 nymph; Montevi- deo, Área Protegida de los Humedales de Santa Lucía; 34°47′07″S, 056°20′04″W; 29–30 Dec. 2012; S. Greco and E. Lorier leg.; FCE-AC 4059 • 5 nymphs, 4 ♂, 3 ♀; same locality; 27 Jan. 2013; S. Greco, W. S. Serra and G. Lecuona leg.; FCE-AC 4037, 4044, 4046, 4050,4342, 4343 • 14 nymphs, 4 ♂, 2 ♀; same locality; 27 Feb. 2013; S. Greco and W. S. Serra leg.; FCE-AC 4047, 4048, 4289–4292 • 2 ♂, 2 ♀; same locality; 23 Mar. 2013; S .

Greco and W. S. Serra leg.; FCE-AC 4321, 4322.

Geographic distribution. Argentina, Bolivia, Brazil, Paraguay and Uruguay ( COPR 1982; Carbonell 2003; Assis-Pujol and Pujol-Luz 2014; Terra et al 2017).

Community descriptors. The Berger-Parker index presented a value of 0.31; low values of this index indicates a high dominance. This might be because two species ( Laplatacris dispar and Amplytropidia australis ) represented 47% of the total number of specimens of Acridomorpha collected ( Table 1). The Shannon index showed a moderate value (H = 2.28). The equitability was moderately high (J = 0.70), despite the fact that five species represented 77% of the total specimens, so it is reasonable to assume the existence of some dominant species in the community. Most of the dominant species belong to the subfamily Gomphocerinae and were uniformly distributed during the sampling period.

Chao 1 (S = 29), Chao 2 (S = 28), Jackknife 1 (S = 30), and Jackknife 2 (S = 31), estimated a number of species approximate to what it was captured (S = 26). The accumulation curve of observed species approaches the curves obtained by the different estimators and tends to the asymptote. Therefore, the survey was sufficient because the estimators indicated a sampling effort of 92% for Chao 2 and 86% for the Jackknife 1 ( Fig. 5 ).

Figures

Figure 4. Acridomorpha species (Orthoptera, Caelifera) found in the Área Protegida de los Humedales de Santa Lucía, Montevideo, Uruguay. A. Laplatacris dispar. B. Orphulella punctata. C. Sinipta dalmani. D. Staurorhectus longocornis longicornis. Scale bars = 10 mm.

Figure 5. Acumulation species curve of Acridomorpha collected from Humedales de Santa Lucía.