Hydraenidae
* Nucleotops interceps Perkins, 2004
Described from the Western Cape Province. Sites 2, 4 & 8.
Prosthetops wolfbergensis Bilton, 2013
One of the largest hydraenids on earth, known from the Western and Northern Cape provinces. Sites 1, 12 & 13.
Pterosthetops hawequas Perkins, 2008
Widespread in the Western and Northern Cape provinces (Bilton 2014b). Sites 1, 2, 4, 9, 12 & 13.
* Mesoceration foggoi Bilton, 2015
Described from the nearby Gifberg-Matsikammaberg massif. Sites 12–14
Mesoceration hantam Bilton, 2014
Described from the Hantamsberg, but clearly more widespread in the Bokkeveld. Sites 11–13.
* Mesoceration longipennis Perkins, 2008
Described from close to the Gifberg in the Western Cape. Common in Sites 10, 11 & 12.
* Mesoceration rufescens Perkins & Balfour-Browne, 1994 Described from the Western Cape Province. Site 12.
Mesoceration cf. semicarinulum Perkins, 2008
A member of the barriotum group, most likely this species. Sites 5–7.
Mesoceration umbrosum Perkins, 2008
Described from the nearby Gifberg-Matsikammaberg and adjacent areas in the Western Cape (Bilton 2015a). Sites 1 & 12.
* Parasthetops benefossus Perkins, 2008
Described from widely separated localities in the Western Cape Province, this species was abundant where found on the Bokkeveld. Sites 5, 6 & 12.
Parasthetops curidius Perkins & Balfour-Browne, 1994
A relatively widespread South African endemic. Sites 1 & 3.
* Parasthetops nigritus Perkins & Balfour-Browne, 1994
Widespread in the Western Cape Province. Sites 2 & 4.
Parasthetops pampinus Perkins, 2008
Recorded from the Hantamsberg by Bilton (2014a). Sites 5, 7 & 8.
* Parasthetops rufulus Perkins & Balfour-Browne, 1994
Described from the Western and Eastern Cape provinces. Site 11.
* Coelometopon blinkwater Perkins, 2005
The most common and widespread species of the genus in the Western Cape, newly reported here from the Northern Cape Province. Site 9.
* Hydraena cooperi J. Balfour-Browne, 1954
A widespread southern African species, occurring north to Namibia (Perkins 2014), but not previously reported from the Northern Cape. Sites 1, 4 & 11.
* Hydraena bicarina Perkins, 2014
Described from the Gifberg in the Western Cape. Sites 1, 7, 12 & 14.
Discozantaena endroedyi Perkins, 2005
Reported from the Hantamsberg by Bilton (2014a). Sites 4, 5, 6, 11, 12 & 14.
Parhydraena faeni Bilton, 2014
Described from the Hantamsberg, but clearly more widespread on the Bokkeveld. Sites 5, 7 & 8.
* Parhydraena maureenae Perkins, 2009
Described from the Western Cape Province. Site 5.
Parhydraena namaqua Perkins, 2009
Known only from the Bokkeveld (Perkins 2009; Bilton 2014a), where it is the commonest species of the genus. Sites 1–3, 5–9 & 11–14.
* Pneuminion endroedyi Perkins, 2004
Described from the Western Cape. Site 13.
Pneuminion velamen Perkins, 1997
The most abundant and widespread species of the genus in the Cape. Sites 1, 2, 5, 8, 9, 13 & 14.
Ochthebius andronicus d’Orchymont, 1948
A widespread Afrotropical species, found throughout South Africa. Sites 1, 4 & 5–7.
Ochthebius pedalis J. Balfour-Browne, 1954
Known from the Western Cape to Namibia, in saline water. Site 3.
Ochthebius spatulus J. Balfour-Browne, 1954
Eastern, Northern and Western Cape provinces, in saline waters. Site 3.
Ochthebius spinasus Perkins & Balfour-Browne, 1994
Known from the Eastern Cape through to Namibia, in saline waters. Site 3.