Hyocrinidae with 5 arms, rarely divided at IBr2ax; proximal arm pattern usually 1+2 3 4 5+6 7+8 with first pinnule ... [details]
Gephyrocrinus with crown length 30 mm. No lateral wings or spines on proximal brachials. Arm pattern 1+2 3 4 5+6 ... [details]
Gephyrocrinus with normal proximal arm pattern of 1+2 3 4 5+6 7+8 9+10 (80%) and first pinnule on Br4; beyond Br4, ... [details]
Hyocrinidae with 5 unbranched arms; proximal arm pattern usually 1+2 3 4 5+6 7+8 or 7 8+9 with first pinnule on ... [details]
Subgenus of Ptilocrinus with tegmen variously inflated; conspicuous radial bridges elevated above tegmen from orals ... [details]
SW Indian Ocean. Depth range: 4,070 to 5,474 m. [details]
N and SW Pacific, and SW Indian Ocean. Depth range: 4,664 to 6,145 m. [details]
Off Tasmania: Depth range: 1,715-1,815 m. [details]
Mironov & Sorokina (1998) treated this species as Ptilocrinus (?Ptilocrinus) perforatus. Roux & Lambert (2011, p. ... [details]