Trichomyia marumbi Rossito, Andrade & Pinho sp. nov.

(Fig. 4A–F; 6E–F)

Type material. Holotype: ♂. BRAZIL. PR. Piraquara.Pico do Marumbi State Park, Mananciais da Serra (SANEPAR). 25°29’30”S, 48°59’39”W. 27.I.2023. CDC. L. Rossito & A.J. Andrade leg. (DZUP) . Paratype: 1 ♂ same data of the holotype (CE-MHS) . 1 ♂ BRAZIL. PR. Piraquara. Pico do Marumbi State Park, Mananciais da Serra (SANEPAR). Caixa do Iporan. 25°28’48”S, 48°58’08”W. 1053 m. 17.I–01.II.2019. A.P. Pinto & B. R. Araújo leg. (DZUP) .

Etymology. The name refers to the type locality, Pico do Marumbi State Park.

Diagnosis. The species can be separated from all other Neotropical Trichomyia by the following combination of characters: Gonocoxite with a lobe and an arm. Lobe with one long seta directed medially; arm of the gonocoxite short in dorsal view and with strong setae resembling a spine; Parameres curved and with divergent apexes; apical expansion of cerci with strong setae with expanded apices.

Description. Male: Head (Fig. 4A) wider than long (395–279), with a row of five supraocular setae. Two pairs of supra-cervical setae. 15–16 occipital setae. Clypeus sub quadrangular (52–55). Antenna incomplete. Flagellomeres (Figs. 4A – B) piriform and united eccentrically. Simple setae absent in all flagellomeres. FI the same length as FII. Ascoids inserted at the base of flagellomeres, both at the same level; ascoids simple, curved and long, reaching the ascoid insertion in the next flagellomere. Palpus (Fig. 2C) with three segments. Length: PI (55), PII (31) and PIII (29).

Wing (Fig. 4D) longer than wide (1464–669). r-m and m-cu absent. Rs branching near the level of the apex of Sc. Base of R 4+5 not sclerotized. Apex of CuA 2 reaching the wing margin slightly basal to the M-fork. Apex of CuA 1 reaching the wing margin at the same level as the R-fork. Apex of R 1 not reaching the wing margin at the middle point of R 2.

Thorax (Fig. 6E). Mesonotum light brown, coxa and paratergite pale, not contrasting, Posterior half of the scutellum with setae. Anepisternal setae present. Distal margin of the metacoxa with an anterior projection, with truncate apex and an apical row of setae. Length of leg segments given in Table 3.

Genitalia (Figs. 4E–G; 6F). Hypandrium (Fig. 4E) not clearly fused with gonocoxite, with a pair of membranous, sub-triangular expansions with an acute apex. Gonocoxite (Fig. 4E) with an arm and a lobe in the internal margin, near the base of the arm, lobe with one long setae directed towards the center. Arm of the gonocoxite short in dorsal view, less than 0.3 the length of the ejaculatory apodeme, apex with long setae and a long apical expansion, from where arise sclerotized setae, with the appearance of a spine. Gonostylus (Fig. 4E) ventrally articulated with the gonocoxite, lightly sclerotized, without setae, sub-triangular, narrow and with rounded apex. Parameres (Fig. 4E) sub-triangular, wider towards the base, curved, divergent, with apexes round and ending beyond the arm of the gonocoxite. Aedeagus (Fig. 4F) long, ending beyond the apexes of the parameres. Ejaculatory apodeme straight and narrowing towards the base (69). Sperm sac trapezoidal. Epandrium (Fig. 4G) sub quadrangular (107–110). Cerci (Fig. 4G) with curved internal margin and apical expansion, where thick rod-like setae, with slightly expanded apex are inserted. Hypoproct (Fig. 4G) with apical micropilosity and rounded apex.

Female. Unknown.

Distribution. Brazil, state of Paraná. Known only from type locality.