Tropiometridae: Brief Summary
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provided by World Register of Marine Species
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.
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- bibliographic citation
- Hess H, Messing CG (2011) Comatulida. In: Hess H, Messing CG, Ausich WI. Treatise on Invertebrate Paleontology, Part T, Echinodermata 2 Revised, Crinoidea, vol. 3. University of Kansas Press, Lawrence, Kansas, pp. 70–146.
- Charles Messing [email]