Opis

Naked body, lamprey-shaped. Oral apparatus with internal phosphatic denticles that armed in pairs both sides of a medial oral fissure. Each denticle composed of a conical crown secreted from outside and a (usually poorly developed) basal filling within the basal cavity. Probably unable to osmotic regulation in low salinity environments.

Synonimy

Zasięg czasowy

Late Cambrian-latest Triassic

Literatura