Opabiniidae is an extinct family of marine stem-arthropods. Its type and best-known genus is Opabinia. It also contains Utaurora, and Mieridduryn. Opabiniids closely resemble radiodonts, but their fro
Jianshanopodia
…Palaeocampa Antennopoda †Antennacanthopodia Onychophora (velvet worms) †Siberiidae †Siberion †Megadictyon †Jianshanopodia †Pambdelurion †Kerygmachelidae †Opabiniidae †Radiodonta (e.g. Anomalocaris) Deuteropoda (modern arthropods) Cladogram after McCall 2023: Total group Euarthropoda †Siberiidae †Siberion †Megadictyon…