SUBCLASS FACETOTECTA GRYGIER, 1985

Diagnosis: Dorsal side of naupliar head shield and carapace of y-cyprid with reticulated external cuticular ridges, forming semi-symmetrical patterns of polygonal plates.Knob-shaped dorsocaudal organ on posterior part of naupliar hindbody. Carapace of y-cyprid univalved, partly covers larval body; antennules often with hook on segment 2; labrum unarmed or with 3-5 or more spines; six pairs of biramous swimming thoracopods; abdomen two- or four-segmented; elongated, plated telson with short, unsegmented furcal rami and multiple setae and pore-openings. Slug-like, unsegmented larval stage (ypsigon). Adults unknown.

Comment: Many additional potential species are becoming known as morphological ‘types’ (Fig. 1A–K) and are presently also being characterized by molecular methods. A future taxonomy will therefore need new genera and probably also new families (Grygier et al., 2019).

Hansenocaris Îto, 1985 (12 species)