Kölliker, 1853
Brief diagnosis: up to 15+ similar, closely applied, dorso-ventrally flattened nectophores bearing protuberances or spines; large, but shallow nectosac; bracts absent (as briefly summarised in key under Page 321).
There are 2 genera, but as Totton (1965) pointed out they are not really distinct. However, in order to maintain the stability of the nomenclature he retained both. The genus Hippopodius is monotypic for Hippopodius hippopus. Poorly preserved material of certain species can be difficult to specifically identify. It appears that hippopodiids may feed almost exclusively on ostracods (Purcell, 1981), and Pugh (1991) found a very significant correlation between the latitudinal and depth distributions of the two groups.
Hippopodius hippopus
Vogtia glabra
Vogtia pentacantha
Vogtia serrata
Vogtia spinosa