Archaeopriapulida

Archaeopriapulida Temporal range: Cambrian Stage 3–Middle Cambrian PreЄ Є O S D C P T J K Pg N
Reconstruction of the celebrated archaeopriapulid Ottoia
Scientific classification
Kingdom:	Animalia
Stem group:	Priapulida (?)
Class:	†Archaeopriapulida
Species
From the Burgess Shale: Ancalagon minor Fieldia lanceolata Lecythioscopa simplex Conway Morris 1977 (Walcott, 1931) Ottoia prolifica Louisella pedunculata Selkirkia columbia Conway Morris 1977 Scolecofurca rara From Chengjiang deposits: Acosmia maotiania Archotuba conoidalis (possibly a Cnidarian) Corynetis brevis Luo & Hu 1999 (=Anningvermis multispinosus Huang et al 2004) Corynetis fortis Hu et al. 2012 Eximipriapulus globocaudatus Ma et al 2014 Gangtoucunia aspera Luo & Hu 1999 (May not be a priapulid) Lagenula striolata Luo & Hu, 1999 nomen dubium Laojieella thecata Han Zhang Zhang and Shu 2006 Oligonodus specialis Luo & Hu, 1999 nomen dubium Omnidens amplus Hou et al 2006 Paratubiluchus bicaudatus Han, Shu, Zhang et Liu, 2004 Paraselkirkia sinica (=P. jinningensis, =Selkirkia sinica Luo & Hu 1999) Sandaokania latinodosa Luo & Hu, 1999 nomen dubium Selkirkia elongata Luo & Hu, 1999 Sicyophorus rara (=Protopriapulites haikouensis Hou, Bergström, Wang, Feng & Chen 1999; =Palaeopriapulites parvus Hou et al 1999) Sicyophorus sp. Xiaoheiqingella peculiaris Hu 2002 (in Chen et al 2002) (=Yunnanpriapulus halteroformis Huang et al 2004) From elsewhere: Eopriapulites sphinx Liu et al 2014 Priapulites konecniorum (Mazon Creek) Selkirkia spencei Resser, 1939 S. willoughby Conway Morris & Robison, 1986

Archaeopriapulida is a group of priapulid-like worms known from Cambrian lagerstätte. The group is closely related to, and very similar to, the modern Priapulids. It is unclear whether it is mono- or polyphyletic. Despite a remarkable morphological similarity to their modern cousins, they fall outside of the priapulid crown group, which is not unambiguously represented in the fossil record until the Carboniferous. They are probably closely related or paraphyletic to the palaeoscolecids; the relationship between these basal worms is somewhat unresolved.