Hypacanthis Cabanis, Mus. Hein., Th. i, p. 161 (1850). Type, Hypacanthis spinoides Vigors.
The genus Hypacanthis was included by Sharpe in Chrysomitris and by Hartert in the genus Acanthis but it seems to be sufficiently well defined from these by its bill; this is more slender and pointed than in the latter, less slender and pointed than in the former. The wings and tail are much the same as in Metaponia. The sexes differ but slightly.