Pneuminion velamen Perkins, 1997

Perkins, Philip D., 2004, A revision of the South African endemic water beetle genus Pneuminion Perkins (Coleoptera: Hydraenidae), Zootaxa 538, pp. 1-38 : 6-7

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 )

Figures

FIGURE 2. Pneuminion velamen holotype. Dorsal and lateral habitus.

FIGURE 12. Pneuminion velamen. Aedeagus of holotype.

FIGURES 23 – 25. Pneuminion distribution maps. — 23. P. velamen. — 24. P. semisulcatum. — 25. P. t u b u m.