Neotropical Nilothauma Kieffer, 1921 (Diptera, Chironomidae): Key, eleven new species, re-descriptions, new combination and new records
Author
Pinho, Luiz Carlos
https://orcid.org/0000-0002-9153-9997
Laboratory of Systematics of Diptera, Department of Ecology and Zoology, Federal University of Santa Catarina, Campus Trindade, CEP 88040 - 900, Florianopolis, Brazil
luizcarlospinho@gmail.com
Author
Andersen, Trond
Department of Natural History, University Museum of Bergen, University of Bergen, P. O. Box 7800, NO- 5020, Bergen, Norway
text
ZooKeys
2021
2021-04-22
1033
81
125
http://dx.doi.org/10.3897/zookeys.1033.60686
journal article
http://dx.doi.org/10.3897/zookeys.1033.60686
1313-2970-1033-81
BEFB015F4A354987AD10DFEB7D4F91DD
2E6467D3D0025F778A77798A4072BCB5
Nilothauma werekena
sp. nov.
Figures 14A-C
, 16D
Type material.
Holotype
male, slide-mounted: Brazil, Amazonas, Barcelos, Rio
Araca
, Foz do
Igarape
Cuieiras, #11,
00°19'15"N
,
63°16'15"W
, 35 m a.s.l., 30.vii-01.viii.2009, light trap, N. Hamada et al. leg. (UFSC).
Paratypes
: 4 males, slide-mounted, same data as holotype (INPA). 2 males, slide-mounted, same data as previous, except: #9,
00°24'39"N
,
63°23'12"W
, 69 m a.s.l., 28.vii-06.viii.2009, light trap #3, N. Hamada et al. leg (MZSP).
Figure 14.
Nilothauma werekena
sp. nov. adult male
A
hypopygium, dorsal view
B
superior volsella, dorsal view
C
hypopygium with anal point and tergite IX removed, dorsal aspect to the left and ventral aspect to the right.
Etymology.
The specific epithet honours the Werekena indigenous people from the Rio Negro Basin in the Amazon. The name is to be regarded as a noun in apposition.
Diagnostic characters.
The male can be distinguished from its congeners by the combination of: tergite IX with one low, but wide median dorsal protruberance with about 30 strong setae; anal point spatulate; superior volsella covered with microtrichia, fused to median volsella; laterosternite IX with thorn.
Description.
Male imago (n = 5-7, unless otherwise stated).
Total length 1.89-2.26, 2.11 mm. Wing length 0.98-1.11, 1.05 mm. Total length/wing length 1.90-2.15, 1.99. Wing length/length of profemur 2.21-2.53, 2.37.
Colouration
.
Head, thorax, legs and abdomen uniformly brown. Wing membrane without dark markings.
Antenna
.
AR = 0.32-0.39, 0.35. Thirteenth flagellomere 230-274, 260
µm
long.
Head
.
Temporal setae 7-8, 7 in single row. Clypeus with 10-14, 12 setae. Tentorium 47-75, 65
µm
long, maximum width 12-20, 17
µm
. Stipes 80-117, 100 (4)
µm
long. Palp segment lengths (in
µm
): 20-32, 27; 22-27, 25; 65-85, 72; 95-125, 110; 87-132, 115. Third palpomere with 2-5, 4 sensilla clavata subapically, longest 12-15, 14
µm
long. Fifth palpomere/third palpomere 1.21-1.75, 1.54.
Thorax
.
Dorsocentrals 6-8, 7 in single row, acrostichals 10-14, 12, prealars 2. Scutellum with 2 setae.
Wing
.
VR = 1.21-1.32, 1.27. Brachiolum with 1 seta, R with 11-12, 11 setae, R1 with 5-8, 7 setae, R4+5 with 11-17, 15 setae, remaining veins bare.
Legs
.
Spur of fore tibia 39-44, 42
µm
long including 15-20, 17
µm
long scale. Mid-tibia with 1 spur, 20-25, 22
µm
long; hind tibia with 2 spurs, 20-25, 23 and 28-31, 30
µm
long. Combs of mid-tibia 17-19, 18
µm
long, of hind tibia 18-21, 19
µm
long. Width at apex of fore tibia 29-39, 34
µm
, of mid-tibia 34-39, 37
µm
, of hind tibia 34-44, 39
µm
. Lengths and proportions of legs as in Table
12
.
Table 12.
Lengths (in
μm
) and proportions of leg segments in
Nilothauma werekena
sp. nov., adult males (n = 5-7, unless otherwise stated).
| - |
Fe |
Ti |
ta1 |
ta2 |
| p1 |
374-501, 433 |
315-394, 345 |
443-522, 473 |
246-286, 266 |
| p2 |
345-463, 424 |
296-345, 325 |
177-207, 197 |
89-99, 94 |
| p3 |
443-532, 493 |
463-522, 502 |
266-305, 286 |
138-158, 148 |
| - |
ta3
|
ta4
|
ta5
|
LR
|
| p1 |
187-217, 207 |
118-148, 138 (4) |
69-89, 79 (4) |
1.36-1.47, 1.40 |
| p2 |
69-79, 74 |
39-49, 44 |
30-39, 35 |
0.56-0.63, 0.60 |
| p3 |
128-158, 148 (4) |
89-99, 94 (4) |
59-69, 55 (4) |
0.57-0.61, 0.59 |
| - |
BV
|
SV
|
BR
|
| p1 |
1.84-2.20, 1.95 |
1.55-1.66, 1.60 |
2.0-3.3, 2.5 |
| p2 |
3.50-4.25, 3.81 |
3.42-4.05, 3.71 |
2.3-4.7, 3.3 |
| p3 |
2.70-2.89, 2.81 (4) |
3.39-3.45, 3.41 |
5.0-7.0, 5.9 |
Hypopygium
(Fig.
14A-C
). Tergite IX without dorsal lobe(s), with low, but wide median dorsal protruberance with 29-32, 31 strong, clustered median setae; posterior margin rounded to subrectangular, with 8-11, 9 weak setae to each side of base of anal point. Anal point spatulate, 37-47, 40
µm
long, maximum width 5-10, 7
µm
. Tergite bands not continuous. Laterosternite IX with 1-2, 1 seta; with anterolateral thorn. Phallapodeme 40-50, 45
µm
long; transverse sternapodeme 15-25, 20
µm
long. Gonocoxite 62-82, 72
µm
long. Inferior volsella strongly curved, 22-30, 27
µm
long, 5-8, 6
µm
wide medially, with microtrichia and 3 strong, simple setae apically. Superior volsella tongue-shaped to slightly pediform, 32-40, 37
µm
long, 15-25, 20
µm
wide at base, densely covered with microtrichia. Median volsella fused to superior volsella, consisting of 2-3, 2 small tubercles, each bearing single, long seta. Gonostylus 70-100, 90
µm
long, basal half curved, distal half straight. HR = 0.63-0.96, 0.83. HV = 2.26-2.70, 2.34.
Female adult and immatures.
Unknown.
Distribution
(Fig.
16D
).
Known from Barcelos (Amazonas State), in the Brazilian Amazon.