Anacroneuria ypane, Stark & Baumann, 2011

Stark, Bill P. & Baumann, Richard W., 2011, Records Of Anacroneuria (Plecoptera: Perlidae) From Bolivia And Paraguay With Descriptions Of Three New Species, Illiesia 7 (19), pp. 182-191 : 187

Anacroneuria ypane sp. n.

( Figs. 11-15 )

Material examined. Holotype ♂, PARAGUAY: Amambay Department, Rio Ypane, cerca Pedro Juan Caballero , 25 November 1956, C.J.D. Brown ( USNM).

Adult habitus. General color brown, patterned with areas of pale pigment. Head with a large area of dark pigment extending from ocellar region over central frons ( Fig. 11 ); dark pigment area expanded laterally in central frons where a small oval pale area is located; lappets and antennae dark brown. Pronotum mostly dark but with a narrow pale median stripe and pale lateral areas. Hind femora dark brown in apical third but pale basally; hind tibia with small dark bands basally and apically but pale for most of length. Wing membrane brown, veins (particularly R vein) dark brown.

Male. Forewing length 10 mm. Hammer thimble shaped, apical diameter less than height ( Fig. 12 ). Aedeagal apex a short, simple, truncate scoop bearing a ventral pair of prominent membranous lobes ( Fig. 13 ); dorsal margin of apical area expanded into a pair of small rounded lateral lobes near point where hooks cross ( Fig. 15 ); dorsal keel lines absent, apex bent strongly dorsad, giving a foot-like shape in lateral aspect ( Fig. 14 ). Hooks slender.

Female. Unknown.

Larva. Unknown.

Etymology. The species name, used as a noun in apposition, is based on the type locality of Rio Ypane.

Diagnosis. This species is related to the Anacroneuria atrifrons Klap á lek group of species ( Froehlich 2008) which includes at least A. azul Rojas & Baena ( Stark et al. 1999), A. canchi Stark & Sivec (Stark & Sivec 1998) and A. pastaza Stark ( Stark 2001) . Of these species, the aedeagus of A. ypane is most similar to that of the Colombian species, A. azul , but the membranous lobes in that species are smaller and a small transverse dorsal keel is present. The latter species also differs from A. ypane in having a much smaller area of dark head pigment.

Comments. Froehlich (2002) reported A. debilis (Pictet) from a single male collected in Parque Nacional Ybycui and A. trimacula Jewett from a single female collected at the same locality. Thus, Anacroneuria ypane becomes only the third member of the genus to be confirmed for Paraguay, and the first to be described from a Paraguayan specimen.

Figures

Figs. 11-15. Anacroneuria ypane structures. 11. Head and pronotum. 12. Male sternum 9. 13. Aedeagus, ventral. 14. Aedeagus, lateral. 15. Aedeagus, dorsal.