Vassilenko, 1968
Medium-large animals. Pereon slender, with tubular segments (Phtisica marina 1). Pereonite I fused with head. Flagellum of ANT II with more than 2 ART. MD lacking molar, with serrate incisor, ordinarily 3-articulated palp, few lacinia mobilis. MXP with broad lobes, inner and outer lobes subequal. Abdomen rudimentary, very small, not segmented, with 0-2 pairs of rudimentary appendages.
Two subfamilies, one in our field of interest:
Subfamily Phtisicinae