Haplodrili, or Archiannelida, is a primitive marine worm part of the annelid phylum. Zoologist Ray Lankester gave it its name of Haplodrili, while zoologist Berthold Hatschek named it Archiannelida. Following five families were included in Haplodrili: Dinophilidae, Nerillidae, Polygordiidae, Prorodrilidae and Saccocirridae.
Read more about Haplodrili: Overview, Commonality