Review of the filter-feeding caddisfly subfamily Macronematinae (Trichoptera: Hydropsychidae) in tropical Southeast Asia Uy, Christine Jewel C. Malicky, Hans Bae, Yeon Jae Raffles Bulletin of Zoology 2018 2018-11-15 66 664 703 Malicky & Prommi, 2009 Malicky & Prommi 2009 [196,717,1399,1423] Insecta Hydropsychidae Macrostemum Animalia Trichoptera 21 685 Arthropoda species seba  ( Figs. 154–159)   Macrostemum seba Malicky & Prommi(in Malicky, 2009): 47 [ Holotypemale; Thailand; HMPC.]   Diagnosis. Male.Antennae 20 mmin length. Antennal flagellum first few segments darker brown then lighter throughout with darker striations. Forewing 10 mmand hind wing 6 mmin length. Mesoscutum and mesoscutellum without evident markings. Tibial spurs 2.4.4.  Male genitalia.Inferior appendages two-segmented, harpago blunt towards the apex ( Fig. 156). In lateral view, phallus with spine-like structure at anterior portion of apex ( Fig. 158). In dorsal view, phallus with lobular tongue in anterior part of apex ( Fig. 159). In lateral view, segment X with broad apex ( Fig. 156), forming U-shape at middle of two lobes in dorsal view ( Fig. 157).   Type material examined.   Holotype.  Thailand:male, Phangnga Province, Sriphanga National Park, coll. T. Prommi,  7 August 2004(HMPC).    Paratypes.  Thailand: 4 males, Phangnga Province, Sriphanga National Park, coll. T. Prommi,  7 August 2004(HMPC);  6 males, Ranong Province, Klongbangmunstream, coll. T. Prommi, 8 October20014 (HMPC).  Additional material examined.   Laos: 1 male, Boli, Kham Xai Province, coll. V. Kuban,  1–18 May 2001(HMPC).   Distribution. Thailand, Laos.   Remarks.The phallus resembles that of  M. dionedorsally. However, the phallus of  M. sebapossesses both dorsal and ventral tongues, whereas that of  M. dionehas only one ( Fig. 159). The original description of the species included drawings of two typesof genitalia and wing patterns. The genitalia drawings included here are based on both the holotypeand paratypespecimens, and both wing pattern variations were drawn as well ( Figs. 154–159). No female specimens were available for examination. [339,535,1494,1516] HMPC Thailand Thailand 21 685 1 holotype 2004-08-07 T. Prommi Thailand Sriphanga National Park 21 685 1 Phangnga holotype 2004-08-07 T. Prommi Thailand Sriphanga National Park 21 685 4 4 Phangnga paratype Klongbangmun & T. Prommi & October Thailand Ranong Province 21 685 6 6 Ranong paratype 2001-05-01 2001-05-18 2001-05-01 Boli & V. Kuban Laos Kham Xai Province 21 685 1 1