WoRMS note details

Diagnosis
English
eng
<i>Antedon</i> with centrodorsal hemispherical, more or less flattened, with fairly large convex polar area. Cirri 15-30, short (usually about a fifth of arm length), 7-8 mm long, of 12-14 cirrals, distally gently recurved and somewhat flattened and wider; longest with L/W ratio ~2; decreasing distally; antepenultimate with L/W ratio ~1.5. P<sub>1</sub> of 10-13 segments; P<sub>2</sub> of 7-10 segments and about half as long as P<sub>1</sub>; P<sub>3</sub> larger than P2. Arm bases making less than a right angle with the oral-aboral axis, at least when arms not fully extended. Arms 20-70 mm (usually 30-35 mm).
The relatively longer cirri, which are not strongly flattened and recurved distally and have longer distal segments, the more or less hemispherical centrodorsal, the smaller P<sub>1</sub> with fewer segments and the absence of the characteristic flattened appearance distinguish this species from the other south Australian form, <i>A. incommoda</i>.
Clark AH, Clark AM (1967) A monograph of the existing crinoids 1(5). Bulletin of the United States National Museum (82):1-860.