Paropsonemid

Paropsonemid; Temporal range: Early Cambrian–Early Devonian[1] PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Stem group:	Ambulacraria
Clade:	†Cambroernida
Family:	†Eldoniidae
Clade:	†Paropsonemida

The paropsonemids are problematic fossils known from the Early Cambrian to Devonian periods, which may be related to the Cambrian eldoniids.[2] They are typified by the Chengjiang genus Paropsonema.

References

Conway Morris, S. (1993). "The fossil record and the early evolution of the Metazoa". Nature. 361 (6409): 219–225. Bibcode:1993Natur.361..219M. doi:10.1038/361219a0.
D. Friend; A. Yu. Zhuravlev & I. A. Solov’ev (2002). "Middle Cambrian Eldonia from the Siberian Platform". Paleontological Journal. 36 (1): 20–24. Archived from the original on 2016-03-03.

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[SCM1993-1] Conway Morris, S. (1993). "The fossil record and the early evolution of the Metazoa". Nature. 361 (6409): 219–225. Bibcode:1993Natur.361..219M. doi:10.1038/361219a0.

[2] D. Friend; A. Yu. Zhuravlev & I. A. Solov’ev (2002). "Middle Cambrian Eldonia from the Siberian Platform". Paleontological Journal. 36 (1): 20–24. Archived from the original on 2016-03-03.