A revision of the South African endemic water beetle genus Pneuminion Perkins (Coleoptera: Hydraenidae)
Author
Perkins, Philip D.
text
Zootaxa
2004
538
1
38
journal article
10.5281/zenodo.157462
a9ccfc65-1459-414b-8a99-c99649f83d51
11755326
157462
3A93701A-E53F-4A89-B4C6-1F952ECC82BD
Pneuminion velamen
Perkins, 1997
(
Figures 2
,
12
,
23
)
Pneuminion velamen
Perkins 1997
:172
.
Type
Material.
Holotype
(male) and 25
paratypes
:
South Africa
, Cape Province, Cederberg,
1130 m
, sifted marsh shore,
32.28S
19.14E
,
7.xi.1983
, EndrödyYounga (#2055); deposited in
TMSA
. Additional
paratypes
: Cape Province, Farm Ezelsfontein, shorewashing,
30.24S
18.05E
,
30.x.1977
, EndrödyYounga (#1407), (4
TMSA
). S. W. Cape, Hawaquas rad. tower,
33.41S
19.06E
, shore washing,
27.X.1978
, EndrödyYounga (#1484), (5
TMSA
). CapeSwartberg, Seweweekspoort Klf,
33.24S
21.21E
, river stones,
18XI1973
, EndrödyYounga (#269), (1
TMSA
). W. Cape, Hawequas,
33.34S
19.08E
, from rock pools,
6.XI.1973
, EndrödyYounga (#210), (3
TMSA
). S. W. Cape, Limiet Berge,
33.33S
19.07E
, water collection at
950 m
,
7.XI.1973
, EndrödyYounga (#215), (1
TMSA
). Cape, Cederberg, Eikenboom,
900m
,
32.27S
19.10E
, river stones,
29X1981
, EndrödyYounga (#1906), (2
TMSA
). Representative duplicate specimens deposited in
AMG
and
MCZ
.
Diagnosis.
Recognized by the black dorsum with conspicuous white setae, the dull, micropunctulate head and pronotum, the lines of white setae on the elytra, and the granules of the elytral intervals and series (
Fig. 2
). The aedeagus is most similar to that of
P. natalensis
, but differs in the shape of the mainpiece, the shape and thickness of the duct, and the shapes and setal arrangement of the parameres.
Description.
Size (mm x 100; length/width): body (length to elytral apices) 191/84, head 36/51, pronotum 42/69, elytra 119/84.
Dorsum black, with moderately dense, conspicuous white setae; legs and maxillary palpi brown. Labrum, clypeus and frons dull, micropunctulate. Labroclypeal suture shallow. Shallow fovea in front of each ocellus, medial margin abrupt.
Pronotum dull, entirely micropunctulate, subrugose in foveae and laterally; punctures on reliefs very small, each divided by tiny granule, therefore appearing paired; all foveae moderately deep; oblique anterior fovea on each side shallowly connecting to midlongitudinal fovea; posterior Ushaped fovea welldeveloped; setae at lateral margin flat on cuticle in dry specimens. Pronotal postocular emarginations deeper and less symmetrical in females than in males.
Elytra with setae of series and interseries equally or almost equally developed, resulting in very discrete, narrowly separated, unilinear rows of setae, about 18 on each elytron, each setal base with large granule on anterior margin, granules of intervals slightly larger and more closely spaced than granules of series; serial punctures very shallow; interseries slightly raised; explanate margin narrow in both sexes.
Aedeagus: mainpiece length 47, total length 70; duct very long, thick in basal onehalf and very slender in apical onehalf; parameres comparatively densely setose apically; mainpiece with ridge/groove to support duct (
Fig. 12
)