Edwardsiidae without physa or with only a weakly developed one. Scapus without nemathybomes but with a more or less well-developed cuticle and scattered tenaculi to which grains of sand are adherent. Nematocysts of the scapus-ectoderm scattered with a tendency to arrange themselves in groups. Nematocysts of scapus and scapulus of about the same size. Inner tentacles longer than the outer ones, now hexamerously, now octomerously [sic] arranged. A weak, ventral siphonoglyph. Mesenteries as in Edwardsia. Retractors diffuse, fairly restricted, parietal muscles well-developed. Cnidom: spirocysts, basitrichs, microbasic p-mastigophors.
P. arenaria Carlgren in Nordgaard 1905
Edwardsia sarsii Dueben and Koren 1847
??Edwardsia cretata Stimpson 1855
Definitions and contained taxa are those of Oscar Carlgren as published in 1949 : Kungl Svenska Vetenskapsakadamiens Handlingar, Series 4, Volume 1, Number 1