Xenonemesia platensis Goloboff, 1988

Nicoletta, Micalea, Panchuk, Justina, Peralta-Seen, Nicolás & Ferretti, Nelson, 2022, Description and Sexual Behavior of Two New Species of Mygalomorph Spiders (Araneae: Theraphosidae, Pycnothelidae), and First Record of (Pycnothelidae) of Corrientes, Argentina., Zoological Studies 61 (62), pp. 1-18 : 14

Xenonemesia platensis Goloboff, 1988 ( Figs. 11–12 )

Material examined: Female holotype and male paratype from General Pacheco, Buenos Aires, Argentina, deposited in Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”, Buenos Aires, 8603 and 8608, not examined).

Additional material examined: 1 female. ARGENTINA. Corrientes: San Martín, Paraje Tres Cerros (29°6'31.54"S – 56°56'2.17"W), N. Peralta-Seen leg. 7.iii.2020 (CARTROUNNE 9386).

Diagnosis: Xenonemesia platensis can be distinguished from congeners by a short and apical straight embolus of male palpal bulb, and females differ by the genitalia having short, straight seminal receptacles ( Fig. 11F ).

Description: See Goloboff (1988: 358–362, figs. 1–14).

Distribution: Argentina, Uruguay and southern Brazil ( Fig. 12 ).

New record: ARGENTINA. Corrientes: San Martín, Paraje Tres Cerros (29°6'31.54"S – 56°56'2.17"W).

Natural history: The female was found in a small crevice under a stone with little silk covering the shelter. A larva attached to the anterior part of the abdomen was observed ( Fig. 11A–B ) and the spider was found to move freely when captured. The larvae possibly belong to a Pompilidae wasp.

Figures

Fig. 11. Xenonemesia platensis. A, Carapace, dorsal view (green arrow indicates the larvae attached). B, Abdomen, dorsal view (green arrow indicates the larvae attached). C, Cephalothorax, ventral view. D, Abdomen, ventral view. E, Eyes, dorsal view. F, Spermatheca. Scale bars = 1 mm.

Fig. 12. Distribution map of Xenonemesia platensis.