Phylocentropus anas, Arefina-Armitage & Armitage, 2011

Arefina-Armitage, I. T. & Armitage, B. J., 2011, Three new species of Phylocentropus Banks (Trichoptera: Dipseudopsidae) from Vietnam, Insecta Mundi 2011 (193), pp. 1-6 : 1-6

Phylocentropus anas sp. n.

(Figures 10-13)

Diagnosis. The male genitalia of this species closely resemble those of Ph. vietnamellus primarily in the shape of segment Xin dorsal view, and somewhat in the shape of the inferior appendage in lateral view. However, Ph. anas is distinguished from Ph. vietnamellus by segment Xbifurcate for half of the entire segment length; by the triangular preanal appendage with broad base; and, by the shape of the inferior appendage in ventral view.

Adult. Length of male forewing 7.0 mm. Main color of body and wings yellowish-brown. Forewings with venation complete; hind wings with forks I, II, III, and V.

Figures 5-9. Phylocentropus ngoclinh sp. n., male genitalia. 5) Lateral view. 6) Dorsal view. 7) Ventral view. 8) Phallic apparatus, lateral view. 9) Distal portion of phallic apparatus, dorsal view.

Male genitalia. Sternite IX 2.5 times as long as wide; in lateral view, anterior portion tapering to blunt apex, posterior portion broadly quadrate with rounded corners. Segment X long, duck head-shaped in lateral view, bifurcatein dorsal view. Preanal appendage large, elongate, broad basally, gradually tapering apically, with rounded apex in lateral view. Intermediate appendage absent. Inferior appendage leaf-like in lateral view; inner surface with dark bump, located dorsobasally; and, with undulate row of setae going across appendage. Phallic apparatus long and slender; endotheca very narrow, tapering to acute apex, slightly bent ventrocaudad.

Female and immature stages. Unknown.

Holotype male. Vietnam, Ha Tinh, Huong Son , 1240 m, 18 o 21’N, 105 o 15’E, Malaise trap, 14 May 1998, J. Carpenter, K. Long, D. Grimaldi, L. Herman, D. Silva.

Distribution. Known only from the type locality in Ha Tinh Province ( Vietnam).

Etymology. This species is named for segment X, duck head-shaped, in lateral view (“anas” is Latin for duck).

Figures 10-13. Phylocentropus anas sp. n., male genitalia. 10) Lateral view. 11) Dorsal view. 12) Ventral view. 13) Phallic apparatus, lateral view.