Trichomacronema tamdao Malicky, 1998

Uy, Christine Jewel C., Malicky, Hans & Bae, Yeon Jae, 2018, Review of the filter-feeding caddisfly subfamily Macronematinae (Trichoptera: Hydropsychidae) in tropical Southeast Asia, Raffles Bulletin of Zoology 66, pp. 664-703 : 697

Trichomacronema tamdao Malicky, 1998

( Figs. 263–267 )

Trichomacronema tamdao Malicky, 1998b: 779 [Holotype male; Vietnam; HMPC].

Diagnosis. Male. Antennae 30 mm in length. Antennal flagellum brown with darker striations. Forewing about 18 mm and hind wing 9 mm in length. Wing pattern as shown ( Fig. 263 ). Mesoscutum and mesoscutellum without evident markings. Tibial spurs 1.4.4.

Male genitalia. Inferior appendages two-segmented, harpago longer than T. paniae , as long as almost half of coxopodite length ( Fig. 264 ). In lateral view, phallus with oval and broad apex ( Fig. 266 ) and narrow dorsally ( Fig. 267 ). Segment X bifid and short ( Fig. 265 ).

Female. Antennae 33 mm in length. Antennal flagellum brown with darker striations. Forewing 18 mm and hind wing 9 mm in length. Wing pattern same as male. Mesoscutum and mesoscutellum without evident markings. Tibial spurs 1.4.4.

Type material examined. Holotype. Vietnam: 1 male, Tam Dao, coll. H. Malicky, 19 May–13 June 1995 (HMPC).

Paratypes. Vietnam: 2 males, Tam Dao, coll. H. Malicky, 19 May –13 June 1995 (HMPC) .

Additional material examined. Laos: 3 females, Hua Phan Province, Phou Pan, coll. C. Holzschuh, 19–21 June 2014 (HMPC) .

Distribution. Thailand, Vietnam, Laos.

Remarks. Trichomacronema tamdao and T. paniae can be easily distinguished by their phalli ( Figs. 261, 266 ). Furthermore, the body of T. tamdao is slenderer than that of T. paniae . However, female specimens may be difficult to identify.

Figures

Figs. 258–271. Trichomacronema paniae. 258, right forewing; Male genitalia: 259, lateral; 260, segment X dorsal; 261, Phallus lateral; 262, Phallus tip. Trichomacronema tamdao. 263, right forewing; Male genitalia: 264, lateral; 265, segment X dorsal; 266, Phallus lateral; 267, Phallus tip. Trichomacronema vietnamensis, new species. 268, right forewing; 269, right hind wing; Female genitalia: 270, lateral; 271, ventral. Scale: 258, 263, 268–269 = 2 mm; 259–262, 264–267, 270–271 = 0.02 mm.