West Palaearctic species of the genus Diostracus Loew, 1861 (Diptera: Dolichopodidae)
Author
Grichanov, Igor Ya.
text
European Journal of Taxonomy
2013
2013-10-30
61
1
14
journal article
22237
10.5852/ejt.2013.61
6da81aec-2005-471c-9cf6-d50788fdaa35
2118-9773
3824982
C47F5484-764A-41E9-8913-3CCB0092B0DF
Key to West Palaearctic species of the genus
Diostracus
(males)
Note: Partially based on previous keys to species of the former genus
Sphyrotarsus
(
Parent 1938
;
Negrobov 1978
).
1. Scutellum with 1–2 pairs of long bristles and with some short lateral setae or hairs............2
– Scutellum with 3 pairs of almost equally long bristles (subgenus
Sphyrotarsus
).....................4
2. Scape with hairs above;
4.5–5.1 mm
.............................
D
. (
Diostracus
)
leucostomus
(
Loew, 1861
)
– Scape bare above..............................................................................................................................3
3. Male and female postpedicel elongate-ovate, 1.5–2 times longer than high, with apical stylus; male abdominal sternites without strong spines; body
5 mm
long ................................................ .....................................................................................
D
. (
Takagia
)
stackelbergi
(
Negrobov, 1965
)
– Postpedicel about as long as high, with dorsal stylus; male 2
nd
to 4
th
abdominal sternites with strong black spines; body
5–6.5 mm
long ..............
D
. (
Lagodechia
)
spinulifer
Negrobov & Zurikov, 1988
4. Male 2
nd
and 3
rd
abdominal sternites with strong black spines; body 7.0 mm (female) to
9.4 mm
(male) long .......................................................................................
D
. (
S.
)
kustovi
sp. nov.
– Male abdominal sternites without strong spines............................................................................5
5. Male cercus shorter than epandrium; body
6 mm
long .......
D
. (
S.
)
caucasicus
(
Negrobov, 1965
)
– Male cercus longer than epandrium................................................................................................6
6. All tarsi with empodium scaly in male, as long as claws; mid basitarsus thin, longer than rest of tarsomeres combined; body
6.5 mm
long ............................
D
. (
S.
)
hygrophilus
(
Becker, 1891
)
– Tarsi with reduced empodium; mid basitarsus shorter than rest of tarsomeres combined.......7
7. Male cercus bifurcated between base and middle; mid basitarsus thickened at middle and at apex................................................................................................................................................8
– Male cercus bifurcated at apex only; mid basitarsus simple or thickened at base..................9
8. Outer arm of cercus long and narrow; body
5.2–6 mm
long .....
D
. (
S.
)
argyrostomus
(
Mik, 1874
)
– Outer arm of cercus short, broad, subtriangular; body
7 mm
long ......
D
. (
S.
)
parenti
(
Hesse, 1933
)
9. Palpus bare; proboscis as long as head; body 5.2 long .....................
D
. (
S.
)
hessei
(
Parent, 1914
)
– Palpus covered with black hairs; proboscis half as long as head; body
6–6.5 mm
long ............. ....................................................................................................
D
. (
S.
)
hervebazini
(
Parent, 1914
)