Male description of the phytotelma-dwelling species Polypedilum parthenogeneticum (Chironomidae: Chironominae)
Author
Donato, Mariano
marianodonato @ ilpla. edu. ar,
Author
Baccaro, Lara
laritabaccaro @ gmail. com,
Author
Siri, Augusto
augusto @ ilpla. edu. ar
text
CHIRONOMUS Journal of Chironomidae Research
2019
2019-10-11
32
32
68
72
https://www.ntnu.no/ojs/index.php/chironomus/article/view/3301
journal article
53586
10.5324/cjcr.v0i32.3301
eb772ff6-25bf-4bdd-b0e2-156cf43c4213
2387-5372
7995417
Polypedilum
(
Polypedilum
)
parthenogeneticum
Donato & Paggi, 2008
(
Fig. 1
)
Polypedilum parthenogeneticum
Donato and Paggi 2008: 52
.
Polypedilum
(
Polypedilum
)
parthenogeneticum
,
new combination
.
Material examined
.
ARGENTINA
:
1 male
with pupal exuviae,
Corrientes
, Riachuelo,
27.5452754
°
S
,
58.7159499
°
W
,
31.xii.2018
, pipette phytotelmata in
Eryngium
L. (
Apiaceae
), L. Baccaro (
ILPLA
).
Male description
Total length
2.03 mm
; wing length
1.5 mm
. Total length/wing length 1.35. Wing length/length of profemur 1.97.
Head.
AR 1.24. Ultimate flagellomere 128 long. Temporal setae 13. Clypeus with 22 setae. Tentorium 117 long; 27 wide. Length of palp segments: 29; 31; 68; 87; 126. Third palpomere with 3 lanceolate sensilla clavata in small pit; longest 19 long.
Thorax.
Dorsocentrals 11, with 3 on humeral area; acrostichals 7; prealars 3; antepronotals 1. Scutellum with 8 setae.
Wing
(
Fig. 1A
). VR 1.15. Brachiolum with 1 seta.
R
with 18;
R
1
with 9;
R
4+5
with 21; remaining veins bare. Squama with 3 setae. Lengths and proportions of legs in
Table 1
.
Legs.
Scale of fore tibia: 45. Spur of middle tibia: 16 and 56; of hind tibia: 26 and 70. Width at apex of fore tibia 50; of middle tibia 49; of hind tibia 54. Lengths and proportions of legs in
Table 1
.
Hypopygium
(
Fig. 1B, C
). Tergite IX with 14 medial setae. Phalapodeme length: 76. Transverse sternapodeme length: 49. Superior volsella 74 long, lateral seta lacking, basal portion of superior volsella with microtrichia and 4 inner setae. Inferior volsella slender 120 long, with 11 setae arranged in two rows. Gonocoxite length: 128. Gonostyle length: 159. HR= 0.81. HV= 1.28.
Table 1. Lengths (in μm) and proportions of legs of the male of
Polypedilum
(
Polypedilum
)
parthenogeneticum
Donato and Paggi
(n = 1). Abbreviations: Femur (fe); Tibia (ti); Tarsomeres 1-5 (ta
1-5
); Leg Ratio (LR), ratio of metatarsus to tibia; «Beinverhältnisse» (BV), combined length of femur, tibia, and basitarsus divided by combined length of tarsomeres 2-5; «Schenkel-Scheine-verhältnis» (SV), ratio of femur plus tibia to metatarsus.
| fe |
Ti |
ta 1 |
ta 2 |
ta 3 |
ta 4 |
ta5 |
LR |
BV |
SV |
| P 1 |
763 |
474 |
886 |
577 |
392 |
289 |
144 |
1.87 |
1.51 |
1.40 |
| P 2 |
804 |
660 |
536 |
227 |
165 |
103 |
82 |
0.81 |
3.46 |
2.73 |
| P 3 |
927 |
660 |
598 |
309 |
289 |
165 |
103 |
0.91 |
2.52 |
2.66 |
Remarks
The larva and pupa of this specimen fits in the original description, except that the branches of the thoracic horn present fine spinules in its tegument. This feature was corroborated also in the females previously described, and therefore the emendation of the pupal diagnosis of
P. parthenogeneticum
is established.