Haplodrili

Haplodrili
Temporal range: 530–0 Ma Cambrian (or earlier?) - present
An image of Polygordius appendiculatus, an archiannelid species.
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Annelida
Class: Polychaeta
Order: Haplodrili
Lankester, unknown date
Families[1]

Dinophilidae
Nerillidae
Polygordiidae
Protodrilidae
Saccocirridae

Synonyms

Archiannelida Hatschek, 1878

Haplodrili, or Archiannelida, is an order of primitive polychaete worms. Zoologist Ray Lankester gave it the name haplodrili, while zoologist Berthold Hatschek later named it Archiannelida. Once considered to be a class under Annelida, and even a separate phylum, Haplodrili is now widely accepted to be an order under Polychaeta.[2] Species in this order are known for completely lacking external segments.

  1. ^ Cite error: The named reference fauchald was invoked but never defined (see the help page).
  2. ^ WoRMS (2004). Read G, Fauchald K (eds.). "Archiannelida". World Polychaeta database. World Register of Marine Species. Retrieved 2014-01-15.