Revision of Polypedilum (Pentapedilum) Kieffer and Ainuyusurika Sasa et Shirasaki (Diptera: Chironomidae)
Author
Oyewo, Emmanuel Adeoye
Author
Saether, Ole A.
text
Zootaxa
2008
2008-12-05
1953
1
145
journal article
11755334
Polypedilum
(
Pentapedilum
)
muscicola
(Kieffer)
comb. n.
(
Fig. 25
)
Pentapedilum muscicola
Kieffer, 1924: 36
.
Not
Polypedilum
(
Pentapedilum
)
tritum
(Walker)
;
Edwards (1929: 376)
.
Material examined.
BELGIUM
:
Locality
and date not stated,
holotype
male,
M. Goetghebuer
(
IRSN
)
.
Diagnostic characters.
The species has numerous setae on the wing membrane, uniformly colored abdomen, foretibial scale with spur, base of superior volsella without microtrichia and projection almost straight as in
P
. (
Pe
.)
intuber
and
P
. (
Pe
.)
botasaneanui,
but differs from both by lacking seta on the projection of the superior volsella.
Male
(n= 1)
Total length
3.42 mm
. Wing length
2.08 mm
. Total length / wing length 2.59. Wing length / length of profemur 1.64. Thorax, abdominal segments, femur, tibia and tarsi pale brown.
Head
(
Fig. 25A
). AR 1.80. Ultimate flagellomere 743 µm long. Temporal setae 14, including 6 inner verticals, 4 outer verticals, and 4 postorbitals. Clypeus with 24 setae. Tentorium (
Fig. 25B
) 150 µm long, 7 µm wide at posterior tentorial pit. Stipes not measurable. Palpomere lengths (in µm): 49, 50, 162, 143, 245. Fifth palpomere / third palpomere 1.51. Third palpomere with 3 sensilla clavata.
Thorax
(
Fig. 25C
). Acrostichals 14, dorsocentrals 26, prealars 11.
Scutellum
with 16 setae.
Wing.
Anal lobe moderately developed. VR 1.07. Brachiolum with 7 setae,
R
with 69,
R
1
with 83,
R
4+5
with 140, Sc with 63,
RM
with 4, M with 18, M
1+2
with 86, M
3+4
with 58, Cu with 52, Cu
1
with 19, PCu with 57, An with 55 setae. Cell m basal of
RM
with 42 macrotrichia. All other cells with more than 100 macrotrichia. Squama with 13 setae.
Legs
. Scale on foretibia (
Fig. 25D
) 62 µm long, with 12 µm long apical spur. Spurs on midtibia 57 µm long, on hind tibia 57 µm long. Comb on midtibia 19 µm long, combs on hind tibia (
Fig. 25E
) 23 µm and 23 µm long. Width at apex of foretibia 55 µm, of midtibia 58 µm, of hind tibia 63 µm. Length and proportions of legs as in
Table 30
.
FIGURE 25.
Polypedilum
(
Pentapedilum
)
muscicola
(Kieffer)
, male.
A—
head;
B—
cibarial pump, tentorium and stipes;
C—
thorax;
D—
foretibial scale;
E—
hind tibial comb;
F—
anal point;
G, H—
superior volsella;
I—
inferior volsella.
Hypopygium
(uncleared). Tergite IX with 11 median setae, laterosternite IX with 2 setae. Anal point (
Fig. 25F
) 43 µm long, 12 µm wide at base, tapering towards 10 µm wide globule-shaped apex. Transverse sternapodeme 60 µm long, phallapodeme 67 µm long. Gonocoxite 188 µm long. Superior volsella (
Fig. 25G, H
)
81 µm long, base bare with 3 inner basal setae, projection without lateral seta. Inferior volsella (
Fig. 25I
) 150 µm long, parallel-sided, with prominent apical seta. Gonostylus 171 µm long. HR 1.10, HV 2.00.
TABLE 30.
Length (in µm) and proportions of legs of
Polypedilum
(
Pe.
)
muscicola
(Kieffer)
, male (n = 1).
| fe |
ti |
ta1 |
ta2 |
ta3 |
ta4 |
ta5 |
LR |
BV |
SV |
BR |
| p1 |
804 |
737 |
– |
– |
– |
– |
– |
– |
– |
– |
– |
| p2 |
919 |
823 |
431 |
292 |
215 |
134 |
77 |
0.53 |
3.03 |
4.04 |
– |
| p3 |
981 |
981 |
– |
– |
– |
– |
– |
– |
– |
– |
Remarks.
The redescription of the
holotype
does not fit the description by
Kieffer (1924: 36)
, especially concerning the superior volsella. The projection lacks a lateral seta and there are three inner setae as opposed to five. The superior volsella is similar to
Polypedilum
(
Polypedilum
)
ephippium
Freeman
, but lacks microtrichia on the base. The species cannot be a synonym of
Pentapedilum tritum
since it lacks a lateral seta on the superior volsella and there are also differences in the number of setae on the wing, especially on veins R, R
1
, R
4+5
, Sc,
RM
, and M. The brachiolum bears 7 setae; in
P
. (
Pe.
)
tritum
the number never exceeds 4. Further, the shape of the superior volsella is different. The number of prealars and setae on the scutellum is higher than in
P
. (
Pe.
)
tritum
; and the species is much larger than
P
. (
Pe
.)
tritum
.
Distribution.
Known from
Germany
and
Belgium
.