FIGURE 5 in Crinoids of the stalked family Hyocrinidae (Echinodermata) collected by the USNS Eltanin in the Southern Ocean

FIGURE 5. Arm articulations and pinnule architecture in Feracrinus heinzelleri. A, F–G: specimen USNM 1126896-2; B–E: USNM 1126892-2 specimen B; A: side view in mid arm (successive brachial pairs and proximal pinnules); B: distal facet of episynostosial brachial with pinnule socket; C: proximal facet of hyposynostosial brachial; D: adoral view of pinnule (cover plates); E–G: lateral views; D, F: non genital pinnule; E: usual genital pinnule; G: short proximalmost genital pinnule; cv: cover plate; H: H-shaped plate; lp: lateral plate; Pn: pinnular; arrow: muscular articulation between Pn1 and Pn2.