Diplosmittia Saether, 1981

Dantas, Galileu P. S., Amat, Eduardo & Hamada, Neusa, 2024, New species and record of Diplosmittia Saether, 1981 (Diptera: Chironomidae, Orthocladiinae) from Brazil and Colombia, Zootaxa 5397 (1), pp. 127-134 : 128

Key to the males of Diplosmittia Saether

[Adapted from Pinho et al. (2009)]

1. Costa not or barely extended (shorter than RM); USA, Mexico, Costa Rica, St. Lucia, St. Vincent, Venezuela and Colombia ( Saether 1981, Figure 13)................................................................ D. harrisoni Saether

- Costal extension well developed......................................................................... 2

2. Gonostylus with three lobes; Brazil ( Shimabukuro et al. 2020, Figures 2D–E )...... D. trifida Shimabukuro, Lamas & Pinho

- Gonostylus with two lobes.............................................................................. 3

3. Anal point crested..................................................................................... 4

- Anal point not crested.................................................................................. 7

4. Virga at least as long as gonostylus, with slightly to strongly bulbous base........................................ 5

- Virga comparatively short, with sclerotized base and posterior spines............................................ 6

5. Main lobe of gonostylus truncated fist-shaped, crista dorsalis inconspicuous; Costa Rica ( Andersen 1996, Figures 1 –4)......................................................................................... D. beluina Andersen

- Main lobe of gonostylus not truncated; crista dorsalis more prominent; Peru, Venezuela ( Saether 1988, Figure 1 ; Pinho et al. 2009, Figure 7).......................................................................... D. recisus Saether

6. Basal lobe of gonostylus enlarged distally, with apical digitiform projection; Venezuela ( Pinho et al. 2009, Figure 5)........................................................................... D. cerayma Pinho, Mendes & Andersen

- Basal lobe of gonostylus not enlarged distally, with rounded apex; Venezuela ( Pinho et al. 2009, Figure 3 )..................................................................................... D. aragua Pinho, Mendes & Andersen

7. Virga clearly shorter than one-third phallapodeme length, without bulbous base.................................... 8

- Virga longer than one-third phallapodeme length, with bulbous base............................................. 9

8. Inferior volsella absent; Costa Rica ( Andersen 1996, Figure 9)................................. D. forficata Andersen

- Inferior volsella distinct; Brazil ( Figures 2C and 3A )......................................... D. dracomaris sp. n.

9. At most the tip of the anal point projecting beyond posterior margin tergite IX; Brazil, Venezuela ( Pinho et al. 2009, Figure 6D)............................................................... D. plaumanni Pinho, Mendes & Andersen

- Anal point projecting well beyond posterior margin of tergite IX............................................... 10

10. Anal point parallel sided; Dominican Republic ( Wiedenbrug & Silva 2016, Figure 1D ).... D. caribensis Wiedenbrug & Silva

- Anal point triangular; Brazil ( Pinho et al. 2009, Figure 4D)..................... D. boraceia Pinho, Mendes & Andersen

Figures

FIGURE 1. Diplosmittia dracomaris sp. n. (Diptera: Chironomidae): A–B. Stream where the new species was collected, at the Ubajara National Park, Ceará, Brazil. C. Male habitus, lateral view.

FIGURE 2. Diplosmittia dracomaris sp. n. (Diptera: Chironomidae), adult male: A–B. Hypopygium, in dorsal view. C. Hypopygium in dorsal view, with tergite IX removed, the red arrow points to the inferior volsella. D. Hypopygium in ventral view, the red arrow points to virga. Scale bar = 25 µm.

FIGURE 3. Diplosmittia dracomaris sp. n. (Diptera: Chironomidae), adult male: A. Hypopygium, in dorsal view, with tergite IX removed. B. Gonostylus, in ventral view. C. Gonostylus in dorsal view. Scale bar = 25 µm.