Anacroneuria malkini Stark & Kondratieff, 2012

Stark, Bill P., Kondratieff, Boris C. & Gill, Brian, 2012, New Species And Records Of Anacroneuria (Plecoptera: Perlidae) From Ecuador And Paraguay, Illiesia 8 (6), pp. 78-93 : 85-86

Anacroneuria malkini Stark & Kondratieff sp. n.

( Figs. 19-23 )

Material examined. Holotype ♂, Ecuador, Pastaza, Rio Cushueme, Cushueme , 150 km SE Puyo, 320 m, 15-30 May 1971, B. Malkin ( CASC).

Adult habitus. General color yellow-brown patterned with darker pigment. Head mostly yellow but with a large dark brown patch covering ocelli, and with dark brown lappets. Antennae dark brown, pronotum brown with scattered pale rugosities and with a pale median band and with areas of lighter pigment along lateral margins ( Fig. 19 ). Femora brown in apical half with narrow black band at knee; basal half of femora pale, tibiae brown. Wings transparent with pale amber tint, veins dark amber with R vein dark brown.

Male. Forewing length 8 mm. Aedeagal apex narrowed from shoulders, rounded at tip, and bearing a pair of membranous ventral lobes ( Fig. 23 ). Dorsal keel consists of a pair of divergent, narrow ridges and a small transverse ridge set at the base of the divergent ridges ( Fig. 21 ); lateral aspect of aedeagal apex broad basally, narrowed to an acute tip and directed toward apex ( Fig. 22 ). Aedeagal hooks gradually curved to acute tips. Abdominal sternum 9 bears a thimble shaped hammer ( Fig. 20 ).

Female. Unknown.

Larva. Unknown.

Etymology. The patronym honors the late Borys Malkin who collected the holotype of this and many other species. Mr. Malkin was a famed naturalist and friend of the well-known Plecoptera authority, Stanley G. Jewett, Jr. The specimens were part of the Jewett collection directed to us by R.W. Baumann.

Diagnosis. The aedeagus of this species is generally similar to that of A. tzapino Stark 2001 , a species also known from Pastaza. The aedeagal apex of that species is slightly notched, the dorsal keel arms are parallel for most of their length, and the apical aedeagal region slants slightly ventrad in lateral aspect (see Stark 2001, Figs. 118-120). In addition, A. tzapino has a more extensive area of brown pigment on the head and the wings are darker, but also have an obscure pale spot at the cord (Stark 2001).

Figures

Figs. 19-23. Anacroneuria malkini male structures. 19. Head and pronotum. 20. Abdominal sternum 9. 21. Aedeagus, dorsal. 22. Aedeagus, lateral. 23. Aedeagus, ventral.