Mejicanotrichia harrisi Bueno-Soria & Barba-Alvarez , 1999

Ramirez-Carmona, Mauricio, Barba-Alvarez, Rafael, Contreras-Ramos, Atilano & Rivas, Gerardo, 2022, Larval and female descriptions of Mejicanotrichia Harris & Holzenthal, 1997 (Trichoptera, Hydroptilidae, Leucotrichiinae) from Mexico, ZooKeys 1111, pp. 355-369 : 355

Mejicanotrichia harrisi Bueno-Soria & Barba-Alvarez, 1999

Fig. 3A-D

Material examined.

5 females (IN-TR-00220). Mexico, Guerrero, Tonalapa del Río, Tonalapa River, near the Atlmolonga “balneario” (780 m a.s.l, 18°20'57.05"N, 99°42'10.12"W), 25 January 2020; leg. M. Ramírez-Carmona and O. Lagunas-Calvo.

Diagnosis.

Unmodified antennae, hindwings lacking patches of scales, as in M. rara , with a body length of 2 mm. Abdominal segment VI without sternite process.

Description.

Dark brown coloration (Fig. 3A ). Body. Range length: 2.3-2.5 mm.

Head. Antennae simple, 17-segmented, scape slightly longer than flagellum; three ocelli present (Fig. 3B ).

Thorax. Wings with reduced venation, mesoscutellum with a transverse line and subrectangular metascutellum. Tibial formula (0, 2, 4). Legs unmodified.

Abdomen. Segment VII elongated, without processes on sternite. Segment VIII short and ring-shaped, with a fringe of setae on posterior margin and a pair of apodemes extending anteriorly. Segment IX short, with pair of apodemes originating on posterolateral margin and extending anteriorly just before anterior margin of segment VII. Segment X rounded apically, with pair of lateral papillae (Fig. 3C ). Bursa copulatrix mostly membranous, with pair of short and truncate lobes extended posteriorly; medially with keyhole-shaped opening and a shield-shaped sclerite (Fig. 3D ).

Comments.

The specimens exhibit a keyhole-shaped opening in the bursa copulatrix, which occurs in the other species of the genus. On the other hand, females of M. harrisi differ from those of other species because of the presence of two short and membranous lobes that extend posteriorly, as well as for having a shield-shaped posterior sclerite (Fig. 3D ).

Figures

Figure 3. Female specimen of Mejicanotrichia harrisi Bueno-Soria & Barba-Alvarez, 1999 A habitus, dorsal B head, dorsal C segments VI-X of abdomen, ventral D bursa copulatrix ventral. Scale bars: 1 mm (A); 800 µm (B); 200 µm (C); 30 µm (D).