Oecetis malickyi, Johanson & Pham & Malm & Sjöberg, 2020

Johanson, Kjell Arne, Pham, Thai Hong, Malm, Tobias & Sjöberg, Tin, 2020, Description of six new species of Oecetis (Trichoptera, Leptoceridae) from Vietnam, Zootaxa 4816 (3), pp. 311-324 : 316-317

Oecetis malickyi sp. nov.

Figs 11–15

Diagnosis. The species is distinguished from many of the Oriental and Palearctic species by the absence of honeycomb structure on pregenital tergites. It particularly resembles O. iros Malicky & Bunlue 2005 (in Malicky 2005) in the male genitalia, particularly the coxopodites and the phallus. It is distinguished from O. iros by the broader apical process of tergum X and the smaller basoventral process of each coxopodite. It also resembles Oecetis gretae sp. nov. in the genitalia, particularly the shape of segment IX in lateral view, the superior appendages, tergum X, and the coxopodites. Oecetis malickyi sp. nov. is distinguished from O. gretae sp. nov. by the slightly shorter tergum X, the wide basal part of each coxopodite reaching nearer mid-length and having the posterior end of the coxopodite narrower, and in the phallus by the shorter ventral process.

Description, male. Length of each forewing 6.9 mm (N = 1). Genitalia ( Figs 11–15 ) clearly taller than long in lateral view. Segment IX oriented almost vertically, ventral part smoothly and widely produced anteriorly; dorsal part slightly narrowing, curving slightly posterad; anterior margin weakly sigmoid; acrotergite of segment IX absent; dorsal process of segment IX minute, forming three semimembranous papillae; semi-membranous area surrounding bases of superior appendages; poorly defined plate covering bases of coxopodites in ventral view; in lateral view each side with lower posterolateral process small, broadly triangular; upper posterolateral process cone shaped, onethird as long as superior appendages; longitudinal apodeme running anterad from lower edge of lower posterolateral process and ending at mid-length on segment IX. Tergum X lacking upper part, lower part about twice as long as superior appendages; in lateral view dorsal margin almost straight, ventral margin expanded ventrad into membranous lobe at mid-length, apex tuboid; in dorsal view with wide base, wide semi-membranous area present around bases of superior appendages, abruptly narrower at 2/3 length, posterior lobe wide basally and narrowing toward blunt apex. Superior appendages cone-shaped, rounded posteriorly in lateral view; widely oval and fused basomesally in dorsal view. Each gonocoxite with broad base and slender distal half curving slightly dorsad, distinctly longer than tergum X, unbranched, but with dorsal lobe at mid-length and basoventral lobe slightly beyond base, apical 1/3 curving slightly dorsad; dorsal margin basally straight with low dorsal lobe before mid-length, distal 1/3 slightly concave, ventral margin beyond basoventral lobe straight to slightly convex apical 1/3; in ventral view broad basally, narrowing distally from base before mid-length; curving mesad from mid-length; setae covering most of coxopodite but with especially long setae originating from dorsal lobe. Phallus almost as long as rest of genitalia, in retracted status with single, boomerang-shaped spine inside originating on left near base and directed posterad toward right before curving posteroventrad apically; phallobase with short apicoventral plate directed posteroventrad.

Male holotype: Vietnam: Ninh Binh Province, immediately S Cuc Phuong National Park , 3 downstream spring, 20.2328°S, 105.6650°E, light trap, 17.iv.2012, loc#VN038, leg. Johanson, DNA voucher JO4 ( VNMN in alcohol) .

Etymology. Malickyi, named for the trichopterologist Hans Malicky, in recognition of his positive impact on the knowledge of the caddisfly diversity in the Oriental region.

Figures

FIGURES 11–15. Oecetis malickyi sp. nov., male holotype, genitalia. 11, left lateral; 12, dorsal; 13, ventral; 14, phallus, left lateral; 15, phallus, ventral. Scale bar = 0.1 mm.