Macrostemum sp.

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 : 687

Macrostemum sp.

( Figs. 171–176 )

Material examined. Philippines: 1 male, Mindanao, Compostella Valley , New Leyte, coll. C.J. Uy, 22 January 2014 ( UPLBMNH) .

Distribution. Philippines.

Remarks. This species is similar to M. quinquepunctatum , which is found on the island of Sibuyan in the Philippines, but exhibits a different wing pattern. In addition, the wings of Macrostemum sp. are colourless ( Figs. 171, 172 ), whereas its phallus apex is more elongated than that of M. quinquepunctatum . This species possesses a more complicated segment X especially in the presence of bifid protrusion in the apex when viewed laterally. It is possible that the species is either new to science or a variation of M. quinquepunctatum . However, it currently remains unclear because this species is only known from a single specimen. Female of this species is so far unknown.

Figures

Figs. 165–176. Macrostemum trifasciatum. 165, right forewing; Male genitalia: 166, lateral; 167, segment X dorsal; 168, phallus lateral; 169, phallus tip. Macrostemum zenon. 170, right forewing. Macrostemum sp. 171, right forewing; 172, right hind wing; Male genitalia: 173, lateral; 174, segment X dorsal; 175, phallus lateral; 176, phallus tip. Scale: 165, 170–172 = 2 mm; 166–169, 173–176 = 0.02 mm (170 redrawn from Malicky, O’Connor & Ashe, 2010).