Macrostemum opulentum Ulmer, 1905

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 : 681

Macrostemum opulentum Ulmer, 1905

( Figs. 131–136 )

Macrostemum opulentum Ulmer, 1905a: 84 [Holotype male; Borneo ; MNHN].

Diagnosis. Male. Antennae broken. Antennal flagellum darker brown in first few segments and brown throughout. Forewing 9 mm and hindwing 7 mm in length. Mesoscutum and mesoscutellum without evident markings. Tibial spurs 2.4.4.

Male genitalia. Inferior appendages two-segmented, separation of harpago and coxopodite almost in the middle ( Fig. 133 ). In lateral view, phallus with flat apex ( Fig. 135 ), spatulate in dorsal view ( Fig. 136 ). In dorsal view, segment IX squarish ( Fig. 134 ). Segment X divided medially with long lobes, widely separated towards the apex in dorsal view ( Fig. 134 ).

Female. Antennae broken. Antennal flagellum same as males. Forewing 9 mm and hindwing 7 mm in length. Mesoscutum and mesoscutellum without evident markings. Tibial spurs 2.4.4.

Material examined. Malaysia: 3 males, 12 females, Sabah, Kinabalu National Park , Poring hot spring, coll. I. Sivec, 21 April 1999 (HMPC) .

Distribution. Borneo, Indonesia.

Remarks. Based on the original description by Ulmer (1905), only the forewing pattern was illustrated. Two forewing colour patterns were observed ( Figs. 131, 132 ).

Figures

Figs. 126–141. Macrostemum midas. 126, right forewing; Male genitalia: 127, lateral; 128, segment X dorsal; 129, phallus lateral; 130, phallus tip. Macrostemum opulentum. 131–132, right forewing; Male genitalia: 133, lateral; 134, segment X dorsal; 135, phallus lateral; 136, phallus tip. Macrostemum pallipes. 137, right forewing; Male genitalia: 138, lateral; 139, segment X dorsal; 140, phallus lateral; 141, phallus tip. Scale: 126, 131–132, 137 = 2 mm; 127–130, 133–136, 138–141 = 0.02 mm.