Article · Wikipedia archive · Last revised Jun 26, 2026

Nectocarididae

Nectocarididae is a controversial family of animals that superficially resemble squids. Represented by Nectocaris from the Cambrian period. Some researchers claim they are cephalopods, however, this is heavily disputed and most reject this claim. A 2025 paper describing the new genus Nektognathus found paired jaw elements in both it and Nectocaris which revealed them to be related to chaetognaths, in particular the superficially similar Timorebestia.

Last revised
Jun 26, 2026
Read time
≈ 1 min
Length
272 w
Citations
7
Source
Wikipedia ↗
Nectocarididae
Temporal range:
Nectocaris pteryx, specimen ROM 60079
Scientific classification Edit this classification
Kingdom: Animalia
Phylum: Chaetognatha
Family: †Nectocarididae
Conway Morris, 1976
Genera1

Nectocarididae is a controversial family of animals that superficially resemble squids. Represented by Nectocaris (=Vetustovermis, Petalilium?) from the Cambrian period.23 Some researchers claim they are cephalopods, however, this is heavily disputed and most reject this claim.45 A 2025 paper describing the new genus Nektognathus found paired jaw elements in both it and Nectocaris which revealed them to be related to chaetognaths (arrow worms), in particular the superficially similar Timorebestia.2

List of genera

References

References

  1. "Nectocarididae". Paleobiology Database. Retrieved 7 December 2023.
  2. Vinther, Jakob; Parry, Luke A.; Lee, Mirinae; Nielsen, Morten Lunde; Oh, Yeongju; Park, Changkun; Kihm, Ji-Hoon; DeVivo, Giacinto; Harper, David A. T.; Nielsen, Arne T.; Park, Tae-Yoon S. (25 July 2025). "A fossilized ventral ganglion reveals a chaetognath affinity for Cambrian nectocaridids". Science Advances. 11 (30). doi:10.1126/sciadv.adu6990. PMC 12285702.
  3. Smith, Martin R. (2019). "An Ordovician nectocaridid hints at an endocochleate origin of Cephalopoda" (PDF). Journal of Paleontology. 94: 64–69. doi:10.1017/jpa.2019.57. S2CID 201208912.
  4. Pohle, Alexander; Kröger, Björn; Warnock, Rachel C. M.; King, Andy H.; Evans, David H.; Aubrechtová, Martina; Cichowolski, Marcela; Fang, Xiang; Klug, Christian (December 2022). "Early cephalopod evolution clarified through Bayesian phylogenetic inference". BMC Biology. 20 (1): 88. doi:10.1186/s12915-022-01284-5. ISSN 1741-7007. PMC 9008929. PMID 35421982.
  5. Kröger, Björn; Vinther, Jakob; Fuchs, Dirk (August 2011). "Cephalopod origin and evolution: A congruent picture emerging from fossils, development and molecules". BioEssays. 33 (8): 602–613. doi:10.1002/bies.201100001. PMID 21681989. S2CID 2767810.