Neorhegmoclemina dentata, Huerta & Dzul, 2010

Huerta, Herón & Dzul, Felipe, 2010, New species of Rhegmoclematini (Diptera: Scatopsidae) from Mexico, Zootaxa 2542 (1), pp. 18-32 : 29-30

Neorhegmoclemina dentata n. sp.

Figs. 7A–C

Type material. Holotype male. Adult on slide mounting, labeled: “ HOLOTYPE Neorhegmoclemina dentata n. sp. México, Guerrero, Municipio Ayutla de los Libres, Localidad La Unión, Rancho El Camalote, 6–18- Jul.-2009, trampa Malaise, Cols. Dzul, F. & W. Bibiano Marín. Elevación: 70 msnm”. (in CAIM).

Diagnosis. Male terminalia asymmetrical; gonocoxite with medial process, toothed in distal row; sternite 7 shield-shaped with parallel apodemes.

Description. Male. Colour. General body coloration brown. Head. Dark brown; eyes with interfacet pubescence. Labella setose, similar to palpus length. Palpus brown, 0.05 mm long, with microtrichia, setae and sensillae and an apical sensory pit with wide opening. Antennae brown, length, 0.29 mm, with 10 flagellomeres; flagellomeres 1–9 with a single whorl of sensilla chaetica on the medial portion, different type of sensilla (similar to sensilla coeloconica) evenly distributed on the surface of the flagellomeres; total flagellum length, 0.22 mm, last flagellomere club-shape, length, 0.06 mm, with sparse setae and scattered sensillae.

Thorax. Dark brown, scutum sparsely covered with setae; anterior spiracular sclerite triangular, with 24 setae; supra-alar setae 8; antepronotum, proepimeron and proepisternum with scattered setae; anepisternum with 9 anterior setae and one more basal seta; katepisternum with 14 setae, meron bare. Legs brown, with pale brown areas. Coxae brown. Femora and tibiae with basal and distal brown rings, with pale brown large area. Tarsi brown. Femora and tibiae with scattered setae; all tibiae with distal spine-like setae and a single row of tibial comb. Tarsomeres armed with distal spine and ventral row of palisade setae. Claws curved; empodia present. Wing. Length, 1.05 mm; width 0.4 mm. Veins R 1 and R 4+5 with a regular row short dorsal setae; M 1 and M 2 complete, medial fork not constricted midway between its origin and wing margin, M 1 and M 2 gradually diverging toward apex; M 1 3.0 times as long as M; macrotrichia present only on CuA 2 and along margin posterior. Halter pale brown.

Abdomen dark brown. Sternite 7 ( Fig. 7A ) shield-shaped, apodemes parallel; tergite 7 concave.

Terminalia. ( Figs. 7B–C ) complex, asymmetrical; tergite 9 with posterior margin truncated; gonocoxite with antero-medial process bag-shaped, with distinctive structure in form of “saw”, and a row distal of strong, heavily sclerotized teeth ( Fig. 7C ).

Aedeagus (penis s. str. Cook 1955a) covered with a thin, bag-shaped hyaline membrane, with a pair of pointed basal apodemes; gonostyle (gonoforceps s. str. Cook) forming a pair of lateroposterior setose lobes; penis valve (s. str. Cook) forming a slender process, longer than lobes, slightly curved medially, and with thin apical setae.

Distribution. Mexico (Guerrero).

Bionomic. The specimen was collected with a Malaise trap from forest habitat.

Etymology. This new species is named dentata for the row of distal teeth on the male terminalia.

Discussion. Neorhegmoclemina dentata n. sp. can be distinguished from other species based on the anterior-mesal process of gonocoxite the male terminalia, with a distal row of teeth. Sternite 7 has well developed, parallel apodemes whilst in other species the apodemes are directed anterolaterally.

Figures

FIGURE 7. Neorhegmoclemina dentata n. sp. (holotype): Male (A, B, C). A. Sternite 7, dorsal view. B. Terminalia, ventral view. C. Process of gonocoxite, ventral view. Scale (mm): A–B (0.064), C (0.04).