The only known specimen (ROM 62976), has a roughly semicircular bivalved carapace, which is approximately long and tall. The head has a pair of rounded eyes, and a pair of upward-curling segmented frontal appendages with at least five segments, the second, third and fourth of which bear a spine, with three long spines and at least one short spine on the fifth and terminal segment. The head also has three pairs of other limbs, which are stubby,
uniramous (single-part) and unsclerotized, with an annulated appearance, which are tipped with bifid claws. Along the trunk are 12 pairs of
biramous (two-branched) limbs, which taper in size posteriorly. Their morphology is simple, the morphology of the
endopod (the inner, leg-like limb branch) is similar to those of the three uniramous head limbs, while the
exopod (the outer limb branch) is sub-lobate, elongate, and possibly flattened, with marginal
setae (hair-like structures) and about the same length as the endopod. The posterior is poorly preserved but may be a tail-piece formed by two lobes or a fan. == Taxonomy and ecology ==