New species of Hercostomus Loew, 1857 from Afrotropics (Diptera: Dolichopodidae) and key to Afrotropical fauna
Author
Grichanov, Igor Ya.
5320AD3A-92D8-4820-8091-24802F8C8C06
All-Russian Institute of Plant Protection, Podbelskogo 3, St. Petersburg, Pushkin, 196608, Russia
grichanov@mail.ru
text
European Journal of Taxonomy
2020
2020-10-22
722
16
36
journal article
10.5852/ejt.2020.722.1131
c2067ab6-9fe9-419e-88c9-c49b3be94c4e
2118-9773
4122305
BA29AE10-E075-4E8C-9DD8-9406FBEC91E7
Hercostomus fedotovae
sp. nov.
urn:lsid:zoobank.org:act:
90F6AB29-BADE-4A85-B45E-F187894798A1
Fig. 2
Diagnosis
The new species belongs to the
Hercostomus nectarophagus
subgroup of species, differing distinctly by its small size, narrow face, fore tarsomere 3 simple, fore tarsomeres 4–5 flattened and widened, fore tarsomere 4 white and tarsomere 5 deep black. The hypopygium is similar to that in other species of the subgroup.
Etymology
The species is named for the Russian entomologist, Dr. Zoya Fedotova (VIZR: All-Russian Institute of Plant Protection,
St. Petersburg
), who has described over 1000 new gall midge species.
Material examined
Holotype
TANZANIA
•
♂
; Morogoro environs;
6.85° S
,
37.67° E
;
2–3 Dec. 2015
;
N. Vikhrev
leg.; terminalia dissected, stored in glycerin in microvial pinned with the specimen;
ZMUM
.
Description
Male
(
Fig. 2
)
MEASUREMENTS (in mm). Body length 2.4; antenna length 0.7; wing length 2.5; wing width 0.8. (
Fig. 2A
)
HEAD. Frons greenish-black, whitу pollinose; face densely white pollinose. One long, strong, vertical pair of ocellar setae; 1 short postvertical, pair of ocellar setae. Upper postocular setae black; lateral, lower ones white. Eye with short hairs; face glabrous. Face gradually narrowed towards palpi, 14 × as high as wide in middle, under antennae ¾ as wide as width of postpedicel, at clypeus ¼ as wide as width of postpedicel; clypeus not reaching lower margin of eyes. Antenna (
Fig. 2B
) as long as height of head, entirely black; pedicel short and wide, convex anteriorly on inner side, with short distal setulae; postpedicel subtriangular, angular distodorsally, as long as high, covered with short pubescence; arista mid-dorsal, black, with short hairs. Length ratio of scape to pedicel to postpedicel to stylus (1
st
– 2
nd
segments), 14/6/12/7/47. Palpus and proboscis moderately small, brown, with short black setae; palpus with 1 black bristle.
THORAX. Greenish-black, greyish pollinose, with yellow metepimeron. Six strong dorsocentral setae; 2 rows of acrostichals, nearly half as long as dorsocentrals; 2 strong notopleural, 1 strong humeral, 1 posthumeral setae present. Propleura with 1 strong black seta above fore coxa and few short hairs. Scutellum with 2 strong setae and 2 lateral hairs.
LEGS. Including coxae yellow; fore tibia and segments 1–3 of fore tarsus brownish; segment 4 white with black apex, segment 5 black; mid and hind tarsi black from tip of basitarsus; fore coxa with black hairs anteriorly and several setae in apical half; mid coxa with 1 strong lateral setae in addition to anterior hairs; hind coxa with 1 strong lateral setae; femora without long hairs; fore tibia without distinct setae; segments 1–3 of fore tarsus with ventral row of sparse short curved hairs; segment 4 flattened laterally, slightly widened, covered with white hairs and several black setae, segment 5 flattened laterally, strongly widened, with dorsal row of black flattened setae (
Fig. 2C
). Length of fore femur, tibia and tarsomeres 1–5 =
0.93 mm
,
0.99 mm
,
0.51 mm
,
0.46 mm
,
0.34 mm
,
0.16 mm
,
0.17 mm
. Mid femur with 1 anterior and 1 posteroventral subapical setae; mid tibia with 1 anterodorsal, 2 posterodorsal and 3–4 apical setae. Length of mid femur, tibia and tarsomeres 1–5 =
0.98 mm
,
1.28 mm
,
0.65 mm
,
0.35 mm
,
0.31 mm
,
0.2 mm
,
0.15 mm
. Hind femur with one subapical anterior seta; hind tibia with 2–3 anterodorsal, 2–3 posterodorsal, 2–3 fine ventral, 3–4 apical setae, thick brown-black apical spine anteriorly; segment 1 of hind tarsus with basal excavation anteriorly. Length of hind femur, tibia and tarsomeres 1–5 =
1.12 mm
,
1.48 mm
,
0.42 mm
,
0.53 mm
,
0.29 mm
,
0.2 mm
,
0.16 mm
.
WINGS. Simple, greyish, veins brown.
Costa
simple. R
1
reaching to first third of wing length. R
2+3
, R
4+5
weakly divergent. Ratio of part of costa between R
2+3
, R
4+5
to between R
4+5
, M
1+2
: 3/1. R
4+5
, M
1+2
slightly convergent in distal part; M
1+2
with weak bend in middle of distal part, joining costa just before wing apex. Crossvein dm-m straight, almost perpendicular to longitudinal wing axis, forming right angle with M
1+2
, M
4
longitudinal veins. Ratio of dm-m to distal part of M
4
, 19/46. Posterior wing margin almost evenly convex. Anal vein distinct, almost reaching wing margin; anal lobe reduced; anal angle absent. Lower calypter yellow, brown anteriorly, with brown setae. Halter yellow.
ABDOMEN. Greenish-black, weakly pollinose, with black hairs and marginal setae. Segment 7 short,
4
⁄
5
length of epandrium. Segment 8 large, covering more than half lateral side of epandrium, with numerous fine short dark cilia. Genitalia (
Fig. 2
D–F) with epandrium brown-black, rounded-oval, twice longer than high. Foramen positioned before middle of left lateral side. Hypandrium mid-ventral, with short base, 4 long thick lobes of different lengths and widths; longest lobe wide, flat, thin, with pointed apex; thickest lobe of hypandrium strongly curved proximally, U-shaped (ventral view). Phallus thin, concealed. Distoventral epandrial lobe fused to epandrium, projected, with 2 short and 1 very long ventral epandrial setae. Surstylus yellow, small, bilobate; each lobe thick at base, thin distally, with 1 long basal seta and 1 short apical seta. Distal lobe of postgonite as long as cercus, broad, curved ventrally, pointed at apex (
Fig. 2F
). Ventral lobe of postgonite broad, subtriangular, strongly sclerotized, with serrate ventral margin (
Fig. 2D
). Cercus yellow, covered with light hairs; large basolateral lobe bearing 3–4 strong, several short setae, long narrow apex bearing 4 long pedunculate setae (
Fig. 2D
).
Female
Unknown.
Distribution
Tanzania
.