Downeshelea bicornis, a new neotropical predaceous midge from Brazil (Diptera: Ceratopogonidae)

Abstract

A new Brazilian species of Downeshelea Wirth & Grogan, D. bicornis, is described and illustrated from a male specime

Taxonomic Revision of Neotropical Downeshelea Wirth and Grogan Predaceous Midges (Diptera: Ceratopogonidae)

“…Figure 5f,g, Figure 9d-f, and Figure 10; Table 1. Downeshelea bicornis Felippe-Bauer and Quintelas, 1993 [15]: 185 (male, Brazil); Borkent and Wirth, 1997 [24]: 97 (in World catalog); Borkent and Spinelli, 2000 [25]: 47 (in catalog south of the USA; distribution); Borkent and Spinelli, 2007 [26]: 80 (in Neotropical catalog; distribution); Borkent, 2016 [22]: 124 (in World catalog); Santarém and Felippe-Bauer, 2019 [2]: 16 (Brazilian distribution).…”

“…Foretarsomere 1 with one basal, one apical spine; midtarsomere 1 with 2-3 ventral spines; apical spines of tarsomeres 2-4 of fore-, mid-, hind legs: 2-2-3, 2-2-4, 1-1-3; foretarsal ratio 2. 15 (Figure 33g): tergite 9 with quadrate apex, apicolateral process short; sternite 9 concave anteriorly, posterior margin with large convex median lobe bearing 3-4 long setae. Gonocoxite brown, moderately stout, 2.12-2.42 (2.32, n = 14) times longer than basal width; gonostylus brown, nearly straight, 0.60-0.67 (0.63, n = 14) length of gonocoxite.…”

“…Morphological terms are from Borkent et al [14]. The antennal ratio was obtained by dividing the combined lengths of the distal five flagellomeres by the combined lengths of the preceding eight flagellomeres for females and the distal four by the preceding nine flagellomeres for males, as was done in our earlier species description of Downeshelea [10,[15][16][17][18][19][20][21]. The distribution of spines on each of tarsomeres 2-4 of all legs are separated by hyphens.…”

“…The female redescription of D. chiapasi was based on additional material from Costa Rica. For species described or redescribed recently [15][16][17][18][19][20][21], we include only the diagnoses, distributions, updated measurements in the table, figures of wing, legs, and spermathecae and illustrations of male genitalia taken from their original publications. Characters to distinguish them from other Downeshelea are in the key.…”