Sharphydrus capensis ( Omer-Cooper, 1955 )

Bilton, David T., 2013, A taxonomic revision of South African Sharphydrus, with the description of two new species (Coleoptera: Dytiscidae: Bidessini), Zootaxa 3750 (1), pp. 26-36 : 27

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Sharphydrus capensis ( Omer-Cooper, 1955 )


Sharphydrus capensis ( Omer-Cooper, 1955)

This species was originally described on the basis of two females, collected in the Lower Berg River in October 1950 by C. Harrison. I have studied the female holotype, deposited in the Natural History Museum, London, which is labelled as being collected in the Lower Berg River nr. Hermon, a locality which is at approx. 65 m a.s.l., ca. 25 km E of Malmesbury, to the North of Cape Town. Omer-Cooper (1966) refers to two other specimens which she considered to belong to this species, a male from Gydo Pass, 10 miles N of Ceres, and another from Alfreds Berg Pass in the Skurfteberg, 10 miles NNW of Ceres. Both of these were collected on the Lund University Expedition to South Africa in 1951. I have studied the first of these males, which is housed in the Lund University Museum, Sweden, and find that it does not in fact belong to S. capensis , having much stronger elytral keels than this species, as well as being somewhat larger and darker in colouration (see Fig. 1 View FIGURE 1 ). This specimen, which is dissected with its genitalia dry mounted on the same card, is in fact a male of Sharphydrus brincki sp. nov., and is included as a paratype of this species below. In my collection I have a pair of the true S. capensis , collected from a stream near Theewaterskloof Dam on 31/xii/1991 by Paolo Mazzoldi. This locality is situated at approx. 300 m a.s.l., around 40 km E of Cape Town, to the South of Franschhoek (see Fig. 4 View FIGURE 4 ). The male, and its genitalia, are illustrated here ( Figs 1C View FIGURE 1 – 2C View FIGURE 2 ). The male is slightly more shiny than the female, and the last joint of the fore and mid tarsi are slightly more elongated.