Tropiometridae AH Clark 1908

Tropiometra is a genus of crinoids in the monotypic family Tropiometridae.

A family of Tropiometroidea with centrodorsal large, thick discoidal to low columnar with large, flattened, cirrus-free aboral area; cirrus sockets large, without distinct ornament, arranged irregularly but tending to form 15 or 20 columns; cirri stout, without aboral spines; cirrals 20-40, generally wider than long; no aboral star; rod-shaped basals not united around center, tapering and rarely exposed on surface; radial articular facet steep and wide; adoral muscle fossae large, wide; radial cavity wide; no central plug; brachials wider than high; 10 arms only; synarthry between Ibr1 and br22 and between br1 and br2. Syzygy between br3 and br4; pinnules without distinct ambulacral covering plates.