basis of record
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. [details]
From editor or global species database
Diagnosis P. longipinna with cirri ~30, of 20-25 cirrals. Proximal pinnules all long;, P1 reaching to about brachial 12, with 12-18 segments, ~7 mm long; P3 usually first genital pinnule, of >9 segments at least 4 mm long. [details]
Distribution Mouth of Rio de la Plata. Depth: 1.097 m. [details]