Porphyrocrinus Gislén, 1925

Roux, Michel, Thuy, Ben & Gale, Andy S., 2025, Plio-Pleistocene deep-sea crinoid (Echinodermata) diversity from the western Rodrigues Ridge, Indian Ocean, revealed by microfossil evidence, Zootaxa 5583 (3), pp. 509-525 : 512

Genus Porphyrocrinus Gislén, 1925

Type species of the genus: Porphyrocrinus verrucosus Gislén, 1925 .

Stratigraphical distribution: late Miocene–Recent.

Emended diagnosis: Crown usually of five rays, exceptionally up to 17 rays; arms usually undivided or with axillaries beyond IBr7, arm pattern of consecutive brachial pairs (rarely triplets) or alternating brachial pairs and free brachials, trifascial ligamentary articulation uniting two brachials of a pair, usually Br7 to 9 bearing first pinnule; aboral cup at least slightly conical, usually taller than wide, basals conspicuous never fused, usually pentagonal; proxistele well-differentiated with very variable number of discoidal columnals frequently united by syzygies of pentalobate facets; mesistele columnals of synarthries moderately oval, variable number of cryptosynarthries or ankylosed synarthries in distal mesistele or dististele.