Scatellini Wirth and Stone

Zatwarnicki, Tadeusz & Mathis, Wayne N., 2024, Revision of the Nearctic Species of the Shore-Fly Genus Scatophila Becker (Diptera: Ephydridae), Zootaxa 5487 (1), pp. 1-100 : 8

Key to Genera and Subgenera of Scatellini Wirth and Stone

1. Mesonotum bearing 2 rows of acrostichal setae extended to anterior margin of scutellum, setae subequal in length........ 2

- Mesonotum bearing 2 rows of acrostichal setae not extended to anterior margin of scutellum, usually with 1 larger, sutural acrostichal seta ( Scatella Robineau-Desvoidy , in part)....................................................... 11

2. Arista shorter than basal flagellomere. Frontal vitta as high as wide.............................................. 3

- Arista longer than basal flagellomere. Frontal vitta wider than high.............................................. 4

3. Pedicel with a long dorsal seta, subequal to length of arista. Apical scutellar seta longer than basal seta................................................................................................ Scatella (Synhoplos) Lamb

- Pedicel with short dorsal seta, shorter than the length of arista. Apical scutellar seta same length of basal seta, small............................................................................................... Tauromima Papp

4. Costa short, extended to or slightly beyond apex of vein R 4+5 ..................................... Scatophila Becker

- Costa longer, extended to apex of vein M.................................................................. 5

5. Arista pectinate above................................................................... Philotelma Becker

- Arista bare to macropubescent........................................................................... 6

6. Only 1 lateroclinate fronto-orbital seta present. Wing infuscate, darker on anterior margin and lighter on posterior margin with distinctive pattern of numerous pale spots.................................................... Limnellia Malloch

- Two or 3 lateroclinate fronto-orbital setae present. Wing hyaline to faintly infuscate or with pattern of a few pale spots..... 7

7. Gena usually bears a long distinct seta, longer and stronger than other genal setae or setulae. Postsutural supra-alar seta subequal to length as postalar seta........................................................ Scatella (Parascatella) Cresson

- Gena without long, strong seta, with a series of uniform fine hairs. Postsutural supra-alar seta shorter than half length of postalar seta................................................................................................ 8

8. Posterior notopleural seta much farther dorsad from ventral notopleural suture than anterior seta....................... 9

- Anterior and posterior notopleural setae equidistant from ventral notopleural suture................................ 10

9. A strong, conspicuous, dorsally curved seta toward anterodorsal corner of anepisternum; prescutellar acrostichal setae long, conspicuous.......................................................................... Haloscatella Mathis

- Seta toward anterodorsal corner of anepisternum indistinguishable from surrounding setae; prescutellar acrostichal seta subequal to length of other acrostichal setae.......................................................... Amalopteryx Eaton

10. Posterior fronto-orbital seta closer to medial vertical seta than to anterior fronto-orbital seta. Frontal vitta shiny............................................................................................... Thinoscatella Mathis

- Posterior fronto-orbital seta closer to anterior fronto-orbital seta than to medial vertical seta. Frontal vitta microtomentose, appearing dull...................................................................... Lamproscatella Hendel

11. Scutellum with 3 pairs of scutellar seta, these subequal in length; mesonotum covered by scattered setulae, not forming a row of acrostichal and intra-alar setae................................................ Scatella (Teichomyza) Macquart

- Scutellum with 2 pairs of scutellar seta, basal pair shorter than apical pair; acrostichal and intra-alar setae present, in small rows.............................................................................................. 12

12. Wing slightly infuscate with few to several distinct pale spots. Sutural acrostichal seta present, conspicuously longer than other acrostichal setae (if absent, presutural dorsocentral seta present).................. Scatella (Scatella) Robineau-Desvoidy

- Wing hyaline, without pale spots. Sutural acrostichal seta present, weak or indistinguishable from other acrostichal setae................................................................................. Scatella (Apulvillus) Malloch