Maruina guria Bravo new species (Figs. 1–10)

Description. Male. Length from thorax to the posterior end of abdomen, 2.10 mm. Head: subcircular in frontal view; eye bridge contiguous (Fig. 1). Incomplete antenna in the specimens studied; scape cylindrical; pedicel spherical, smaller than scape (Fig. 2); flagellomeres barrel­shaped; a pair of short, single filamented ascoids are presented after flagellomere 4 (Fig. 3). Palpi with 4 articles; relative length of palpomeres 1.0:1.2:1.5:1.8 (Fig. 4).

Wing (Fig. 5) lanceolated; wing length 2.10 mm; maximum width 0.54 mm; with R5 ending at tip. Sc short, not reaching C; R3 jointed to R2+3.

Abdomen (Fig. 6). Sternites 5–8 with internal sclerotized bands; sternite 6 with tuft of long red bristles; sternite 8 with two lateral areas covered by a tuft of short, thick, black setae.

Terminalia. Cerci, gonocoxites and gonostyles with pilosity (Figs. 7, 9); gonocoxites with approximately 17 bristles on the dorsal surface; sternite 10 with apical micropilosity (Fig. 8). Tergite 9 plate­like, rectangular (Fig. 8). Sternite 9 lacking. Cerci digitiform with a single apical tenaculum (Fig. 7). Apex of gonostyle denticulate (Figs. 7, 9). Aedeagus symmetrical, bifid, with apex curved dorsally; aedeagal spines lacking (Figs. 7, 9). Aedeagal apodema as long as gonocoxite. Gonocoxal apodema as long as aedeagal apodema (Fig. 7).

Female. Similar to male except for the following characters: length of body 1.8 mm. Relative length of palpomeres: 1.0:1.1:1.6:2.0. Wing length 2.10 mm; maximum width 0.50 mm. Abdominal sternites without internal sclerotized bands, and without tufts of bristles or setae. Subgenital plate conical; lobes short (Fig. 10). Cerci with a medial lobe (Fig. 10).

Type material. Holotype male, allotype female and three paratype females: Brazil, Minas Gerais State, Serra do Cipó, 09.II.1983, D. S. Amorim col. (MZUSP).

Etymology. Hogue (1973) traditionally used women’s Latin­American regional affectionate expressions to name new species of Maruina. Following his tradition, the specific name “ guria ” means girl in Brazilian Portuguese.

Comments. The major characteristic of the genus Maruina is the lanceolate format of the wings, which are four times as long as wide (Hogue 1973). Another characteristic observed in most species of Maruina is the development of M2 not reaching M1 (Hogue, 1973), except in the two Caribbean species: M. hoguei Wagner and M. tobagensis Wagner (Tab. 1). An additional characteristic of the genus Maruina is the presence of aedeagal spines, except in M. chiringa Hogue and M. querida Hogue (Tab. 1).

In addition to the characteristics given by Hogue (1973), in this work two other characteristics are proposed that can distinguish the species of the subgenus Aculcina: the eye bridge contiguous or separated by even 4 ocular facet diameters; and R3 united to R2 (Tab. 1).

The species M. colombicana Wagner & Joost was initially proposed in the subgenus Maruina (Wagner & Joost 1994). This species presents most characteristics of the subgenus Aculcina mentioned above, except in regards to the separation of the eye bridge, which is 7 facet diameters (Tab. 1). M. colombicana is therefore considered to be a species of the subgenus Aculcina.

The subgenus Maruina can be identified by the presence of di­ or trimorphic aedeagal spines, with the posterior ones being much heavier and shorter than the anterior, ninth sternite in the male well developed, and a well sclerotized subgenital plate in the female (Hogue 1973). Other characteristics proposed as proper to the subgenus Maruina are: eye bridge separated by 7 to 10 facet diameters; R3 not united to R2 (Tab. 1). This is the only subgenus with species in the Americas north of Mexico.

M. guria sp. nov. is a typical species of the subgenus Aculcina (Tab. 1). It shows eyebridges contiguous; R3 complete and united to R2; monomorphic aedeagal spines in the male terminalia; sternite 9 not developed in the female.

The presence of sclerotized bands on the abdominal sternites 5–8 in males of M. guria sp. nov. has only been noted for two species of Maruina of the subgenus Aculcina: M. caceresi Wagner and M. colombicana Wagner & Joost (Wagner 1988, Wagner & Joost 1994). M. caceresi can be differentiated from M. guria sp. nov. as the former has two circular areas covered by long black bristles on sternites 5–8 (Wagner 1988), while the latter species shows these bristles only on segments 5 and 8. M. colombicana shows only two areas with long bristles on sternite 5 (Wagner & Joost 1994).