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Previous analyses have tended to arrange parvipelvians in a pectinate arrangement: that is, where each taxon represents an additional step on a phylogenetic tree that has ophthalmosaurids at its ‘tip’.

Spikes pectinate, of very many spikelets, oblong or linear, very dense, solitary and terminal or few in a raceme; sterile flowers 1–3 on a short pedicel, neutral, consisting of 1–3 scales and awns.

Bill usually straight and sharply pointed; lores naked; head feathered; tarsus with transverse scales; middle toe-nail pectinate or with a comblike edge.

The Rhipidophoridae are beetles with, short elytra, the feelers pectinate in the males and serrate in the females.

The margin is thin and marked by deep furrows and ridges, so that it is deeply striate, or the terms sulcate or pectinate sulcate are used to express the character of the margin.