Review of the genus Pagastia Oliver (Diptera: Chironomidae: Diamesinae) from North America, with description of P. (P.) subletteorum sp. nov.
Author
Makarchenko, Eugenyi A.
text
Zootaxa
2019
2019-09-02
4664
1
115
128
journal article
25818
10.11646/zootaxa.4664.1.5
0497b481-e216-41a4-b1f8-fd732cb69ca1
1175-5326
3383574
F7CD7865-7A8E-44F4-9982-8F9E35A84FD9
Key to the known species of
Pagastia
Oliver
of Holarctic region
Males
1. Eyes hairy. Aedeagal lobes reduced (subgenus
Hesperodiamesa
Sublette
). Basal lobe of gonocoxite small.....................................................................................
P.
(
H.
)
sequax
(
Garrett, 1925
)
(
Fig. 18
)
- Eyes bare or pubescent. One or two aedeagal lobes present (subgenus
Pagastia
Oliver
). Basal lobe of gonocoxite large.... 2
2. Both median and lateral aedeagal lobes present. AR 2.5-4.2.................................................... 3
- Only lateral aedeagal lobe present. AR 1.0–2.42............................................................. 6
3. Antepronotum with dorsal and lateral setae in widely separated groups. Median aedeagal lobe digitated and widest in distal part................................................................................................ 4
- Antepronotum completely covered with setae. Median aedeagal lobe widest medially, then tapering abruptly and with the apex forming a sharp hook..........................................
P
. (
Pagastia
)
partica
(
Roback, 1957
)
(
Figs.16–17
)
4. Gonostylus subapical with "heel"....................
P
.
(
P
.)
nivis
(Tokunaga, 1936)
(
Makarchenko 2006
, Fig. 180, 5–10)
- Gonostylus subapical without "heel"...................................................................... 5
5. Apex of the gonostylus is angled..............
P.
(
P
.)
orientalis
(Tshernovskij, 1949)
(
Makarchenko 2006
, Fig. 181, 1–5)
- Apex of the gonostylus is broadly rounded.............................................................................................
P
.
(
P
.)
altaica
Makarchenko, Kerkis et Ivanchenko, 1997
(
Makarchenko
et al.
1997
,
Fig. 1
)
6. Anal point absent. AR 1.0–1.2. Alula of wing with some setae.............
P
.
(
P
.)
subletteorum
sp. nov.
(
Figs. 1–6
,
19–20
)
- Anal point present. AR 1.54–2.42. Alula without setae........................................................ 7
7. Anal point almost parallel-sided in dorsal view; lateral aedeagal lobe tapering to thin apex........................... 8
- Anal point tapering to apex; lateral aedeagal lobe wide in distal part............................................. 9
8. Anal point with rounded apex and without apical peg....................
P
.
(
P
.)
orthogonia
Oliver, 1959
(
Figs. 7–13
,
21
)
- Anal point with pointed apical peg. AR 1,56–1.75.............
P.
(
P
.)
hidakamontana
Endo, 2004
(
Endo 2004
,
Figs. 1–6
)
9. Anal point narrow, tapering to pointed apex, without apical peg; gonostylus in basal part with outer angle-shaped projection. AR 2.18–2.42................
P.
(
P
.)
tianmumontana
Makarchenko
et
Wang, 2017
(
Makarchenko &Wang 2017
,
Figs. 17
)
- Anal point widest in basal part and thin apically, pointed and often with apical peg; gonostylus without outer basal projection. AR 1.81–2.10...............................
P
.
(
P
.)
lanceolata
(Tokunaga, 1936)
(
Makarchenko 2006
, Fig. 180, 1–4)