Macrostemum bravoi

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 : 307

Macrostemum bravoi França, Paprocki & Calor, new species

Figs. 3 A–E

This new species has a distinct medial prominence on the anterior margin of its falciform phallotremal sclerite in ventral view. This species is similar to Macrostemum erichsoni , but the anterior margin of segment IX is rounded and the apex of the phallus is truncate in lateral view. The forewings of the new species have a distinctive pattern of hyaline and brownish areas with blurred boundaries while all previously described species have very well-defined dark spots. However, the distribution and the shape of the spots can resemble those of M. erichsoni .

Description. Adults in alcohol. Forewing mean length 11.9 mm (11.29–12.86 mm, n=7). Head yellowishbrown. Compound eyes black. Scapes brown dorsally and yellow on ventral surfaces. Maxillary palps yellow with ferruginous and yellow setae. Prothorax yellow. Meso- and metathorax yellowish-brown. Legs brownish-yellow. Tibial spur formula 1,4,4. Forewings with dark and hyaline pattern colors; but spots without clearly distinguishable boundaries; each with discoidal cell present; radial sector normal ( Fig. 3 A).

Male genitalia. Abdominal segment IX, in lateral view, with anterior margin rounded; posterior margin sinuous, deeply notched, bordered by long setae above and below notch ( Fig. 3 B); in dorsal view with posterior margin bearing medial acuminate keel and long setae along right and left posterior margins ( Fig. 3 E). Segment X, in dorsal view, bilobed, each lobe apically rounded and with subapical wart ( Fig. 3 E); in lateral view, tapered to rounded apex, with subdorsal row of small setae 2/3rds distance from base and another on ventrolateral margin ( Fig. 3 B). Inferior appendages uniformly covered by small setae; each with basal segment approximately same length as apical segment, constricted subbasally; apical segment gradually broader to near rounded apex ( Fig. 3 B). Phallus arched; apex, in lateral view, truncate, with small rounded posteroventral prominence; phallotremal sclerite falciform, without dorsal process, bearing medial prominence on anterior margin ( Fig. 3 C); phallotrema rounded, concave, apically positioned on posterior surface of phallus.

Holotype male: BRAZIL: Bahia: Barreiras, APA Rio de Janeiro, Cachoeira Acaba Vida, 11º53’S, 45º36’W, 705 m, 4.vi.2008, luz, F. Bravo, Menezes, Alvim, Silva-Neto leg., 1 male (alcohol; MZSP).

Paratypes: Same data as holotype, 4 females (alcohol; MZSP); same data except Cachoeira Redondo, 11o53’S, 45o25’W, 573 m, 5.vi.2008, luz, F. Bravo, Menezes, Alvim, Silva-Neto leg., 1 female (alcohol; UFBA); Mato Grosso: Nova Xavantina, Córrego Ponte de Pedra, 14º57’51’’S, 52º37’13’’W, xii.2006, luz, A. Calor, S. Mateus, R. Silva leg., 1 female (alcohol, UFBA).

Etymology. The specific epithet is in honor of Dr. Freddy Bravo, who collected this new species and contributes significantly for taxonomy of insects.

Distribution. Brazil (BA, MT).

Figures

FIGURE 3. Macrostemum bravoi, new species. 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.