Lannapsyche tairomyenensis, Suwannarat & Malicky & Laudee, 2020

Suwannarat, Nannaphat, Malicky, Hans & Laudee, Pongsak, 2020, Four new species of caddisflies (Trichoptera: Polycentropodidae, Psychomyiidae Hydropsychidae, Odontoceridae) from Khao Nan and Tai Rom Yen National Parks, southern Thailand, Zootaxa 4801 (3), pp. 577-583 : 581-583

Lannapsyche tairomyenensis n. sp. Malicky & Suwannarat

Figs. 4 A–4F

Type Material. Holotype male ( PSUNHM). Thailand, Tai Rom Yen National Park , Dad Fah waterfall 3, 8 o 50’N, 99 o 19’E, 911 m, 31.x.2018, leg. Nannaphat Suwannarat.

Paratypes: 5 males from the same site and from nearby sites, altitudes 854–960 m, collected on 22.iv.2018 and 30.x.2018, leg. Nannaphat Suwannarat; one male: Tai Rom Yen National Park, Pha San Yen stream, 1100 m, 30.x.2018, leg. Nannaphat Suwannarat ; 3 males: Huai Khamin, Ban Song, Wiang Sa district , 8 o 42’N, 99 o 29’E, 820 m, 30.x.2018, leg. Nannaphat Suwannarat ; one male: Khao Nan National Park, Klong Gray river 3, 8 o 45’N, 99 o 32’E, 1147 m, 6.iv.2018, leg. Nannaphat Suwannarat ( PSUNHM) .

Etymology. The species is named for the type locality, Tai Rom Yen National Park.

Description. Unicolorous brown with darker eyes. Length of each forewing 7–8 mm.

Male genitalia ( Figs. 4 A–4F). In dorsal view ( Fig. 4A ), segment IX somewhat triangular and with shallow U-shaped excision anteriorly; in lateral view ( Fig. 4B ), segment IX hexagonal, lateral margins slightly concave anterodorsally and posterodorsally; segment IX divided by lateral horizontal grooves into two parts, dorsal part slightly taller than ventral part. Preanal appendages semicircular along posterior edges of segment IX in dorsal view ( Fig. 4A ); in lateral view, preanal appendages transversely crescent-shaped and with setae; segment X small, tubular, rounded posteriorly with setae in dorsal view ( Fig. 4A ); in lateral view, segment X scale-like with setae present mostly parallel with posterior edge of preanal appendages ( Fig. 4B ). Inferior appendages each with coxopodite straight, long and cylindrical with two subapical lobes nearly identical in shape and size in lateral view, separated by harpago ( Fig. 4B ); harpago slender, setose, inserted between subapical lobes ( Fig. 4B ) in lateral view. In ventral view, inferior appendages long, bent inward and tapered apically ( Fig. 4C ), with harpago scarcely visible ( Fig. 4D ). Phallus short and stout, hand-shaped in lateral view, and bulb-shaped in ventral view ( Figs. 4E, 4F )

Diagnosis. The genitalia of the new species are similar to those of L. chantaramongkolae found in northern Thailand ( Malicky 1989) and in southern China ( Yang et al 2017). They can be distinguished by characteristics of the dorsal view of segment IX. In L. chantaramongkolae , segment IX is rectangular with relatively small, concave preanal appendages along posterior edge of segment IX, but in L. tairomyenensis n sp. segment IX in dorsal view is triangular with distinctly convex preanal appendages along posterior edges of this segment. In dorsal view, segment X of L. chantaramongkolae is long and triangular, but short and tubular in the new species. Moreover, the harpago of L. chantaramongkolae appears distinctly longer than the subapical lobes of inferior appendages, but in the new species the harpago and subapical lobes are relatively similar in shape and length.

Figures

FIGURES 4A–4F. Male genitalia of Lannapsyche tairomyenensis n. sp. 4A, dorsal. 4B left lateral. 4C, ventral. 4D, right inferior appendage apex, ventral. 4E, phallus, left lateral. 4F, phallus, ventral. Har = harpago (paired), Inf = inferior appendage (paired), Pre = preanal appendage (paired), Seg IX = abdominal segment IX, Seg X = abdominal segment IX, Sub A = dorsal and ventral subapical lobes of basal segment of inferior appendage (paired).