Diagnosis

English

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Antedon 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. P₁ of 10-13 segments; P₂ of 7-10 segments and about half as long as P₁; P₃ 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 P₁ with fewer segments and the absence of the characteristic flattened appearance distinguish this species from the other south Australian form, A. incommoda.

Clark, A. H., Clark, A. M. (1967). A monograph of the existing crinoids. <em>Bulletin of the United States National Museum.</em> (82): 1-860.