Scaptomyza
Creators: name: Magnacca, Karl N.
name: O'Grady, Patrick M.
Publisher: name: Zenodo
Year: 2008
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Drosophilidae
Scaptomyza

description: Key to the Hawaiian Subgenera and Unplaced Species of Scaptomyza, and Species of Subgenera Engiscaptomyza, Grimshawomyia, and Titanochaeta
1. White longitudinal stripe present on scutellum, anteriorly reaching at least to posterior region of mesono- tum, often extending along entire length of mesonotum; terminal fork of arista deep, each branch equal in length to dorsal rays of arista ............................................................................ subgenus Tantalia Malloch
- Scutellum and mesonotum may be striped or unicolorous, but never with longitudinal white stripe described above; terminal fork of arista not deep, branches less than length of dorsal rays.......................2
2. Rays of arista short; chaetotaxy (e.g., katepisternal and dorsocentral setae) generally reduced; four rows of acrostichal setulae; two well-developed humeral setae .........................subgenus Exalloscaptomyza Hardy
- Rays of arista elongate; combination of other characters not as above.......................................................3
3. Either zero or one ventral ray present on arista ......................................................................................... 4
- More than one ventral ray present on arista...............................................................................................10
4. Eight rows of acrostichal setulae present; female ovipositor sclerotized, may be needle-like and pointed.. ................................................................................................................. subgenus Titanochaeta Knab, 24
- Acrostichal setulae present in two to six rows; female ovipositor fleshy, non-sclerotized, non-dentate....5
5. Arista lacking ventral rays...........................................................................................................................6
- One ventral ray present on arista.................................................................................................................7
6. Head flattened, longer than high; eyes strongly oblique; strong set of presutural dorsocentral setae present ....................................................................................................................subgenus Rosenwaldia Malloch
- Head nearly square as seen in direct lateral view, lower margin approximately equal in length to the fron- tal margin; enlarged setulae may be present in presutural position, but not strong....................................... ......................................................................................................................subgenus Elmomyza Hackman
7. Two rows of acrostichal setulae present ................................................... subgenus Parascaptomyza Duda
- Number of acrostichal rows varies from four to six....................................................................................8
8. Wings with marks over crossveins and at apices of R and M veins. Hawai‘i, Moloka‘i, O‘ahu, Kaua‘i .... ..................................................................................................................................... S. parva (Grimshaw)
- Wings completely hyaline........................................................................................................................... 9
9. Head broader than thorax ................................................................... subgenus Alloscaptomyza Hackman
- Head not broader than thorax. Hawai‘i........................................................................ S. taractica (Hardy)
10. Shining black species, thorax and abdomen polished black; two or three ventral rays present on arista; ocellar triangle large, extending to level of proclinate setae; acrostichal setulae present in four rows; clump of black setae on hind trochanter....................................................... subgenus Bunostoma Malloch
- Mesonotum brown (black in S. totonigra), sometimes with longitudinal vittae; acrostichal setulae in six to
eight rows; ocellar triangle not enlarged; hind trochanter lacking distinctive black setae........................11 11. Second antennal segment sharply pointed apically, extending over base of third segment; wings distinctly infuscated around veins and margins, central portions of cells mostly hyaline ............................................ ........................................................................................................... subgenus Grimshawomyia Hardy, 22 - Second antennal segment not sharply pointed; wings hyaline or evenly smoky.......................................12
12. Tibiae yellow with two narrow brown bands, fainter on front tibia .............................................................. ..................................................................................................... subgenus Engiscaptomyza Kaneshiro, 17
- Tibiae all yellow, or brown with yellow apices.........................................................................................13
13. Palpi greatly enlarged, protruding beyond the oral margin. Kaua‘i ......................... S. magnipalpa (Hardy)
- Palpi not enlarged, enclosed within the oral cavity when mouthparts retracted........................................14
14. Epandrium with a prominent anteroventral lobe, over half as high (dorsoventrally) as main portion of epandrium; surstyli long and broad, setulose over the concave medial surface (see Figs. 117c and 211c in Hardy, 1965)..............................................................................................................................................15
- Epandrium lacking a prominent lobe; surstyli not broad and medially setulose; mesonotum brown to black; femora dark brown.........................................................................................................................16
15. Thorax entirely yellow; ventral lobe of epandrium broader at apex than at base. O‘ahu.............................. ......................................................................................................................................... S. vinnula (Hardy)
- Mesonotum and anepisternum rufous, tinged with brown; ventral lobe of epandrium nearly parallel-sided, about as wide at apex as at base. O‘ahu ...................................................................... S. improcera (Hardy)
16. Tibiae all yellow. Moloka‘i .............................................................................................. S. prolixa (Hardy)
- Tibiae brown except narrow bases and apices. Moloka‘i, O‘ahu................................ S. totonigra (Hardy)
description: Published as part of Magnacca, Karl N. & O'Grady, Patrick M., 2008, New combinations in Hawaiian Drosophila and Scaptomyza (Diptera: Drosophilidae), pp. 53-60 in Zootaxa 1926 on pages 56-57, DOI: 10.5281/zenodo.184810