Ommatius costatus Rondani 1850
Creators: name: Vieira, Rodrigo
name: Castro, Ivan
name: Bravo, Freddy
Publisher: name: Zenodo
Year: 2005
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Asilidae
Ommatius
Ommatius costatus

description: Key to the Neotropical costatus species group males
1. Margin of scutellum without bristles ........................................ O. achaetus Scarbrough
­ Margin of scutellum with two or more bristles ............................................................ 2
2. Internal margin of epandrium with projection .............................................................. 3
­ Internal margin of epandrium without projection ........................................................ 9
3. Gonostylus wide in lateral view ................................................................................... 4
­ Gonostylus narrow in lateral view ................................................................................ 6
4. Apex of epandrium forked; hypandrium subtruncate ................ O. orenoquensis Bigot
­ Apex of epandrium acute; hypandrium triangular or rhombus like.............................. 5
5 Hypandrium triangular ...................................................................... O. oreophilus Farr
­ Hypandrium rhombus­like ....................................................... O.humatus Scarbrough
6. Posterior margin of epandrium acute ........................................................................... 7
­ Posterior margin of epandrium rounded ....................................................................... 8
7. Hind tibia with spine­like apical bristle ....... O. serrajiboiensis Vieira, Castro & Bravo
­ Hind tibia without spine­like apical bristle ............ O. cinthiae Vieira, Castro & Bravo
8. Ventral lamella with narrow membranous area medially ................... O. amula Curran
­ Ventral lamella without narrow membranous area medially...... O. uncatus Scarbrough
9. Width of aedeagal apodeme, in lateral view, greater than or equal to aedeagal sheath. ..................................................................................................................................... 10
­ Width of aedeagal apodeme, in lateral view, smaller than aedeagal sheath................ 12
10. Gonostylus narrow in lateral view ..................................... O. complanatus Scarbrough
­ Gonostylus wide in lateral view .................................................................................. 11
11. Hind tibia without spur­like apical bristle; aedeagal sheath with projection in the middle section of the basal margin ................................................. O. dentatus Scarbrough
­ Hind tibia with spur­like apical bristle; aedeagal sheath with anterior projection in the basal margin .............................................................................. O. spinosus Sacrbrough
12. Anterior margin of aedeagal sheath with projection .................................................. 13
­ Anterior margin of aedeagal sheath without projection ............................................. 14
13. Hind tibia with spur­like apical bristle .................................... O. piliferous Scarbrough
­ Hind tibia without spur­like apical bristle ................................ O. didymus Scarbrough
14. Aedeagal apodeme, in lateral view, slightly larger than aedeagal sheath ...................... ........................................................................................................... O. alexanderi Farr
­ Aedeagal apodeme, in lateral view, at least twice as large as aedeagal sheath........... 15
15. Dorsal margin of aedeagal sheath, in lateral view, having acute projection .................. ............................................................................................... O. incurvatus Scarbrough
­ Dorsal margin of aedeagal sheath, in lateral view, without acute projection ……..… 16
16. Aedeagal sheath triangular in lateral view; epandrium with short inner apical projection in ventral view ......................................................................... O. costatus Rondani
­ Aedeagal sheath trapezium in lateral view; epandrium with long inner apical projection in ventral view ................................................................................ O. riali, sp. nov.
description: Published as part of Vieira, Rodrigo, Castro, Ivan & Bravo, Freddy, 2005, A new species of Ommatius Wiedemann (Diptera: Asilidae) from Brazil, pp. 19-24 in Zootaxa 1017 (1) on pages 20-21, DOI: 10.11646/zootaxa.1017.1.2, http://zenodo.org/record/5049352