Calliceratomyia zayolli, Huerta, Heron & Amorim, Dalton De Souza, 2016

Huerta, Heron & Amorim, Dalton De Souza, 2016, Three new species of Calliceratomyia Lane (Diptera: Ditomyiidae) from Neotropical Mexico, Zootaxa 4072 (4), pp. 430-440 : 438-439

Calliceratomyia zayolli , sp. n.

( Figs. 4 , 7 , 12 , 15 , 18 )

Diagnosis. Flagellomeres 1–12 with a short ventral extension, last flagellomere slightly shorter than penultimate flagellomere; flagellomeres 1–3 with one longer ventral seta, flagellomere 14 with two longer setae ( Figs. 4 , 7 ). M forking considerably basal to origin of R4 ( Fig. 12 ). Extension of male gonocoxites distal to syngonocoxite enlarged midway to apex, an obvious fold along the inner basal margin of gonocoxites. Gonostylus length almost width at apex. Two separate groups of spines apically on inner face of male gonostylus ( Figs. 15 , 18 ).

Type-material. Holotype male, labeled: HOLOTYPE Calliceratomyia zayolli sp. n. Mexico, Hidalgo, Localidad Tlanchinol, km 3.5 carretera Tlanchinol-Apantlazol, GPS: 20’59’16”N, 98’39’36”W, elevation, 1,540 m, in cloud forest (CAIM).

Description. Body length (including the antenna), 5.0 mm. Head. Head wider than long. Eyes dichoptic all facets of similar width, length of interommatidial setae close to facet width. Three ocelli present, aligned, of similar size, distance between ocelli slightly smaller than their diameter. Vertex slightly elevated, with setae, transverse suture present, frons bare, face with 14 setae, lateral pair of setae as long as first palpomere. Clypeus more or less triangular. Mouthparts considerably reduced, labellum small; premental apodeme Y-shaped. Maxillary palpus longer than labellum, with three brown, clearly articulated palpomeres. First palpomere humpback, distinctively bulky distally, with 8 socketed setae, entirely covered by sensillae; second palpomere shorter than first, with some sensilla at basal half, projected beyond base of third palpomere, apically with 4 diminute spines and one socketed seta; third palpomere more or less cylindrical, with some sensilla on basal third and 6 minute apical spines. Antenna ( Figs. 4 , 7 ) with 15 flagellomeres, 2.2 mm length. Scape and pedicel cylindrical, about 1.2 times as long as wide. Flagellomere 1 more or less cylindrical, flagellomeres 2–8 strongly compressed laterally, with a short but evident ventral projection, flagellomeres 9–13 less modified, flagellomere 14 cylindrical, elongate; apical flagellomere small, cylindrical, 0.7 times length of previous flagellomere ( Fig. 7 ); flagellomeres covered with short fine sensilla-like trichia, one dorsal and one ventral longer seta on flagellomeres 1–3; flagellomeres 13–14 with two setae; all flagellomeres with longer dorsal setae. Thorax. Scutum uniformly brown, evenly setose, without transverse suture; notopleural, supra-alar areas and postalar callus with long bristles; scutellum brown, with a pair of subapical setae. Mediotergite high, bare, dark brown; pleural sclerites brown, anepisternum, katepisternum, mesepimeron, and laterotergite bare. Postpronotum with a pair of long bristles, proepisternum with three long bristles and three small setae. Haltere brown, slightly longer than the first abdominal tergite, pedicel and capitulum covered with short setae. Legs. Similar to previous species. Wing. ( Fig. 12 ) Membrane infuscate brown. Length, 4.7 mm; width, 1.8 mm. M1+2 basally fused to Rs, medial fork more basal than base of R4. Otherwise similar to previous species. Abdomen. Similar to previous species. Male terminalia ( Figs. 15 , 18 ). Dark brown, bent downward. Gonocoxites robust, elongate, enlarged midway to apex, setose, fused basally forming a syngonocoxite ring around aedeagus, anterior margin wide, slightly concave. Inner basal margin of gonocoxites with an obvious fold. Gonostylus clearly longer than width at apex, densely setose, slight shorter than gonocoxite, ornamented with two well separated rows of spines apically, ventral row with 12 blunt, strongly sclerotized spines, dorsal row with 7–8 spines. Aedeagal complex consisting of a simple, straight process, with a pair of short lateral branches on anterior end, an opening at apex, ventrally covered by fused parameres. Tergite 9 short, with setation along posterior margin. Cercus lobate, entirely covered with setae.

Female. Unknown.

Bionomics. The only known specimen was collected with a Malaise trap in a cloud forest in the north part of the state of Hidalgo, Mexico.

Distribution. Mexico (Hidalgo).

Etymology. The specific epithet refers to zayolli -, which means “fly” in Nahuatl language. The term is used in apposition.

Figures

FIGURES 2 – 4. Antennae of Calliceratomyia. 2. C. papaveroi, sp. n., male holotype. 3. C. pantelhomyia sp. n., male holotype. 4. C. zayolli, sp. n., male holotype. Scale bar, 0.1 mm. Flag = flagellum; Ped = pedicel, Sc = scape.

FIGURES 5 – 7. Antennal flagellomeres 13 – 15 of Calliceratomyia. 5. C. papaveroi sp. n., male holotype. 6. C. pantelhomyia sp. n., male holotype. 7. C. zayolli sp. n., male holotype. Scale bar, 0.1 mm.

FIGURES 10 – 12. Wings of Calliceratomyia. 10. C. papaveroi sp. n., male holotype. 11. C. pantelhomyia sp. n., male holotype. 12. C. zayolli sp. n., male holotype. Scale bar, 0.5 mm.

FIGURES 13 – 15. Ventral view of male terminalia of Calliceratomyia. 13. C. papaveroi sp. n., holotype. 14. C. pantelhomyia sp. n., holotype. 15. C. zayolli sp. n., male holotype. Scale bar, 0.1 mm.

FIGURES 16 – 19. Ventral view of male terminalia of Calliceratomyia. 16. C. papaveroi sp. n., holotype. 17. C. pantelhomyia sp. n., holotype. 18. C. zayolli sp. n., male holotype. 19. C. pantelhomyia sp. n., holotype, inner view of distal end of gonostylus. Scale bar, 16 – 18: 0.064 mm.