COLOBOMETRIDAE A.H. Clark, 1909a

Mohammednowshad, B., Idreesbabu, K. K., Parameswaran, Usha V., Messing, Charles G. & Sureshkumar, S., 2020, The Shallow-water Crinoid Fauna of Lakshadweep Atolls, North-western Indian Ocean, Zootaxa 4789 (1), pp. 247-265 : 259

Family COLOBOMETRIDAE A.H. Clark, 1909a

Diagnosis.— Some or all cirrals with aboral transverse ridge, commonly serrate or tuberculate, or with transverse row of 2 or 3 tubercles or spines; distal (rarely all) spines often single; radial articular facet steep, separated along interradial margin; interarticular ligament fossae moderate and triangular to large and high, separated by wide and shallow midradial furrow (except in Cyllometra ); adoral muscle fossae small and vestigial to low, slightly curved along adoral margin; arms 10 to>80; brachitaxes 2 or 4(3+4); first syzygy on undivided arms at 3+4; proximal brachials sometimes with lateral processes; one or more proximal pinnules (usually Pa) may be absent; some genera with pinnulars broadened over gonads (from Messing & Tay, 2016; modified from Hess & Messing, 2011).