WoRMS note details

<i>Antedon incommoda</i> with centrodorsal discoidal, with aboral pole quite flat although variable in width and with cirrus sockets sometimes encroaching. Cirri 20-35, of up to 13 (rarely 14) cirrals; longest cirrals with L/W ratio not more than 1.5; antepenultimate about as long as broad or broader; distal half of cirri wider than proximal half; cirrus length ~20% of arm length when that is about 35 mm. Arms to 50 mm long. P<sub>1</sub> of 15-32 segments; P<sub>2</sub> less than half as long with nearly half as many segments; P<sub>3</sub> genital, similar P<sub>2</sub>.
Clark AH, Clark AM (1967) A monograph of the existing crinoids 1(5). Bulletin of the United States National Museum (82):1-860.