Macrostemum braueri (Banks 1924)

França, Diogo, Paprocki, Henrique & Calor, Adolfo R., 2013, The genus Macrostemum Kolenati 1859 (Trichoptera: Hydropsychidae) in the Neotropical Region: Description of two new species, taxonomic notes, distributional records and key to males, Zootaxa 3716 (3), pp. 301-335 : 314

Macrostemum braueri (Banks 1924)

Figs. 7 A–E

Macronema braueri Banks 1924: 454 , Plate 1 [type locality: Brazil, Amazonas, Tefé; MCZ; ♀; wings]; Fischer 1963: 178 [bibliography, distribution]; Flint 1978: 390, 401, 416, 420, 421 [distribution; ♂; wings].

Macrostemum braueri (Banks 1924) ; Flint et al. 1999: 68 [taxonomic notes; distribution]; Paprocki et al. 2004: 8 [distribution].

Macrostemum braueri can be diagnosed by the long acuminate anteroventral prominence at the apex of the phallus, in lateral view, and by the M-shaped phallotremal sclerite in ventral view. The forewings of this species resemble those of M. negrense , but in this species the dark spot on the apical area delimits only one boot-shaped hyaline area while in M. negrense it delimits two boot-shaped hyaline areas.

Synopsis. Adults in alcohol. Forewing mean length 8.9 (8.28–10.13 mm, n=3). Head yellow with brown spot behind eyes. Compound eyes black. Scapes yellow. Maxillary palps black at middle and pale yellow at ends. Prothorax yellow. Meso- and metathorax yellow. Legs yellow with foretibiae brown. Tibial spur formula 2,4,4. Forewings mostly hyaline, each with one dark spot bordering apical area and delimiting one boot-shaped hyaline area; discoidal cell present; radial sector normal ( Fig. 7 A).

Male genitalia. Abdominal segment IX, in lateral view, with anterior margin rounded; posterior margins concave and bordered by long setae ( Fig. 7 B); in dorsal view, posterior margin with medial rounded keel and long setae bordering right and left margins ( Fig. 7 E). Segment X, in dorsal view, bilobed, each lobe apically rounded and with subapical wart; with one pair of pronounced, subdorsal warts basally and pair of subdorsal, longitudinal rows of setae ( Fig. 7 E); in lateral view, subtriangular, blunt apically, with irregular row of small, ventrolateral setae in apical half, in addition to warts and setae visible in dorsal view ( Fig. 7 B). Inferior appendages covered uniformly by short setae and uniformly wide throughout their length; each with basal segment approximately 1.5 times length of apical segment; apical segment slightly upcurved ( Fig. 7 B). Phallus arched; apex, in lateral view, truncate, with long acuminate posteroventral prominence ( Fig. 7 C); phallotremal sclerite broadly M-shaped, without dorsal process ( Fig. 7 D); phallotrema apically positioned on posterodorsal surface of phallus ( Fig. 7 D).

Material examined. BRAZIL: Amazonas: Manaus, Reserva Ducke, 24.ix.1976 (10-7), 1 male (pinned; INPA); Rio Preto da Eva, Ramal Baixo Rio, Estrada Poliana, Igarapé do Geladinho (#38), 2º46’48,2’’S, 59º39’9,6’’W, 24–27.ix.2008, armadilha luminosa (pensilvania), J.O. da Silva, C. Monteiro, C. Menezes leg., 3 males (alcohol, UFBA).

Distribution. Brazil (AM).

Figures

FIGURE 7. Macrostemum braueri (Banks 1924). A, right fore- and hind wings, dorsal view; B – E, male genitalia: B, left lateral view; C, phallus, left lateral view; D, apex of phallus, ventral view; E, terga IX and X, dorsal view.