Diagnosis
provided by World Register of Marine Species
A family of Tropiometracea with well-developed side and covering ambulacral plates; P1 resembling P2 but is shorter and more slender, with first two segments not noticeably enlarged; radial muscular fossae short and transversely linear; centrodorsal large, columnar; cirrus sockets in 15 or 20 crowded and often irregular columns; cirri with >25 cirrals, most with aboral spine.
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