Arrenurus deltensis Rosso de Ferradas, 1984

(Figure 4)

Material examined— Argentina. Entre Ríos Province: 1/0/0, ditch at Brazo Largo, N of Zarate, 33°54’37,21” S, 58°51’9,24” W, 6-xi-1999.

Description — Male: Idiosoma brownish, dorsally 745 long and 429 wide; ventrally 788 long. Anterior idiosoma margin straight, posterolateral corners angular. Distance anterior idiosoma margin-dorsal shield 105, the latter 340 wide. Cx-I and Cx-II anterolaterally pointed. Cauda 373 wide, relatively long with a pointed hump, somewhat widened at level of hump, posteriorly truncated; posterior margin with a shallow indentation. Genital plates relatively short, 227 wide, swollen and visible as well in dorsal view.

Remarks — The male specimen of this study differs from the description of Rosso de Ferradas (1984) in the somewhat larger distance between the postocularia and the less truncated posterior margin of the cauda. However, it has similar angular posterolateral corners of the idiosoma, relatively short genital plates and the cauda with a pointed hump. Therefore, I assigned this specimen to A. deltensis . The female remains unknown.

Distribution — Known from Argentina only (Rosso de Ferradas 1984).