Anisocentropus tairomyenensis, Suwannarat & Malicky & Laudee, 2018

Suwannarat, Nannaphat, Malicky, Hans & Laudee, Pongsak, 2018, Two new species of Caddisflies (Trichoptera: Insecta) from Lower-Hill Evergreen Forests of Southern Thailand, Zootaxa 4524 (4), pp. 496-500 : 497-498

Anisocentropus tairomyenensis n. sp. Suwannarat and Malicky

Figs. 7–11

Type material. Holotype male (PSUNHM). Thailand: Surat Thani Province, Tai Rom Yen National Park, Khao Nong, Lam Phun stream, 8°50′33″N, 99°30′27″E, ca. 960 m a.s.l., 20 March 2017, leg. Pongsak Laudee.

Paratypes: Same data as holotype, 2 males (PSUNHM); Thailand: Surat Thani Province, Tai Rom Yen National Park, Pha San Yen stream, 12°04′52″N, 99°37′43″E, ca. 1,100 m a.s.l., 12 February 2017, leg. Pongsak Laudee, 1 male (PSUNHM) .

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

Description. Length of each male forewing 13.0–14.0 mm (n = 4); specimens in alcohol with head, thorax, abdomen light yellowish brown and forewings dark brown.

Male genitalia ( Figures 7–11 ). Segment IX in dorsal view longitudinally short, broad, with pair of rounded posterolateral projections and acute mesal projection ( Fig. 8 ); in lateral view ( Fig. 7 ), trapezoidal with round incision anterodorsally; in ventral view ( Fig. 9 ), segment IX somewhat semicircular, with U-shaped excavation apically for half of its length. Preanal appendages in dorsal view ( Fig. 8 ) long and stoutly tubular basally, short and triangular and projecting caudolaterad apically, covered by long setae; in lateral view ( Fig. 7 ) long, slender, wide basally, curved ventrad, and tapering to acute apices. Segment X in dorsal view ( Fig. 8 ) rectangular with shallow Vshaped excision and rounded ends apically; somewhat triangular, rounded apically in lateral view ( Fig. 7 ). Inferior appendages tubular, apicoventrally pointed in lateral view ( Fig. 7 ); tubular, hooked mesad apically in ventral view ( Fig. 9 ). Phallus tubular with conspicuous phallotremal sclerite, rounded apically in lateral view ( Fig. 10 ); truncate apically in ventral view ( Fig. 11 ).

Diagnosis. Anisocentropus tairomyenensis n. sp. is a member of the subgenus Anisomontropus ( Malicky 1994) . Some of these species are very similar to each other and may be separated by minor differences only, such as the dorsal aspect of the tips of the preanal appendages, as in A. insularis Matynov 1930 , A. janus Malicky & Chantaramongkol (in Malicky 1994), and A. maculatus Ulmer 1926 , but these differences were seen to be constant in many specimens studied. The new species is similar to A. janus . Both of the species have very similar lateral aspects of genitalia and are characterised by tubular inferior appendages with clawed-like apices. Anisocentropus (Anisomontropus) tairomyenensis n. sp. is well characterized by the striking, basally wider and apically pointed preanal appendages, distinguished from A. janus with its cylindrical, straight, apically rounded preanal appendages.

Figures

FIGURES 7–11. Male genitalia of Anisocentropus tairomyenensis n. sp. 7, left lateral. 8, dorsal. 9, ventral. 10, phallus, left lateral. 11, phallus, ventral. IX = segment IX, X = segment X, Inf = inferior appendage (paired), Pre = preanal appendage (paired).