Anacroneuria yuko, Stark & Zúñiga, 2014

Stark, Bill P. & Zúñiga, Maria del Carmen, 2014, New Species And Records Of Colombian, Ecuadorian And Venezuelan Anacroneuria (Plecoptera: Perlidae), With A Review Of The Anacroneuria Aymara Stark & Sivec Complex, Illiesia 10 (8), pp. 66-79 : 75-76

Anacroneuria yuko sp. n.

( Figs. 12-16 )

Material examined. Holotype ♂, Colombia, [Cesar Department], Socorpa Mission, Sierra de Perijá , ~ 1350 m, 10-22 August 1968, B. Malkin ( CAS).

Adult habitus. General color pale brown. Head pale yellow-brown with slightly darker lappets and frons, forward of ocelli ( Fig. 12 ). Antennae dark brown. Eyes with numerous fine, white setae giving a hairy appearance. Pronotum pale yellow-brown with darker sublateral bands; broad median field pale. Wing membrane pale amber with darker veins; C vein pale, Sc and R much darker. Legs pale except for narrow brown distal band superimposed on black band; tibiae with narrow proximal and distal brown bands.

Male. Forewing length 12 mm. Hammer thimbleshaped, height subequal to apical diameter ( Fig. 13 ). Aedeagal apex abruptly narrowed from shoulders, forming a slender, median projecting lobe, offset from shoulders by moderately deep grooves ( Fig. 14 ); shoulders slightly scalloped along anterior margin. Dorsal keel short in median field, but with small basolateral struts which connect to longer, dark, arcuate supports ( Fig. 16 ). Apical area in lateral aspect with a basodosal ear-shaped lobe and a slightly more anterior slender crescent lobe; most of apical region membranous ( Fig. 15 ). Hooks moderately wide, saber-like.

Female. Unknown.

Larva. Unknown.

Etymology. The species name honors the Yuko people who inhabit the region near the type locality. The name is used as a noun in apposition.

Diagnosis. The aedeagal structure of A. yuko is similar to that of A. arcabuca Zúñiga & Stark 2006 (in Zúñiga et al. 2006,) and to A. tejon Baena & Stark 1999 (in Stark et al. 1999), but it differs from both in the lateral profile of the apical aedeagal region. In the new species this structure projects more strongly away from the aedeagal body ( Fig. 15 ), whereas, in the two known species, this process is more dorsally oriented. The new species is more similar to the former species but is smaller (17.5 mm forewing in A. tejon ), has a more defined keel and less pronounced scalloping along the anterior margins.

Comments. This new species is the second Anacroneuria to be reported from the Serranía de Perijá range which forms part of the border between northwestern Colombia and adjacent areas of Venezuela (see comments under A. paleta above). The collection site for the holotype lies on the northwestern slope of the mountain range and is in the drainage basin of Rio Cesar which enters the Magdalena River and the Colombian Caribbean. This mountain range is considered part of the biogeographic unit known as the Cinturón árido Pericaribeño.

Figures

Figs. 12-16. Anacroneuria yuko male. 12. Head and pronotum. 13. Sternum 9 with hammer. 14. Aedeagus, ventral. 15. Aedeagus, lateral. 16. Aedeagus, dosal.