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A giant stem-group chaetognath.

Park, Tae-Yoon S; Nielsen, Morten Lunde; Parry, Luke A; Sørensen, Martin Vinther; Lee, Mirinae; Kihm, Ji-Hoon; Ahn, Inhye; Park, Changkun; de Vivo, Giacinto; Smith, M Paul; Harper, David A T; Nielsen, Arne T; Vinther, Jakob

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Tae-Yoon S Park

Morten Lunde Nielsen

Luke A Parry

Martin Vinther Sørensen

Mirinae Lee

Ji-Hoon Kihm

Inhye Ahn

Changkun Park

Giacinto de Vivo

M Paul Smith

Arne T Nielsen

Jakob Vinther


Chaetognaths, with their characteristic grasping spines, are the oldest known pelagic predators, found in the lowest Cambrian (Terreneuvian). Here, we describe a large stem chaetognath, gen. et sp. nov., from the lower Cambrian Sirius Passet Lagerstätte, which exhibits lateral and caudal fins, a distinct head region with long antennae and a jaw apparatus similar to . has previously been interpreted as a total-group chaetognathiferan, as either a stem-chaetognath or gnathostomulid. We show that shares a ventral ganglion with chaetognaths to the exclusion of other animal groups, firmly placing these fossils on the chaetognath stem. The large size (up to 30 cm) and gut contents in suggest that early chaetognaths occupied a higher trophic position in pelagic food chains than today.


Park, T. S., Nielsen, M. L., Parry, L. A., Sørensen, M. V., Lee, M., Kihm, J., …Vinther, J. (2024). A giant stem-group chaetognath. Science Advances, 10(1), Article eadi6678.

Journal Article Type Article
Acceptance Date Dec 1, 2023
Online Publication Date Jan 3, 2024
Publication Date 2024-01
Deposit Date Mar 21, 2024
Publicly Available Date Mar 21, 2024
Journal Science advances
Publisher American Association for the Advancement of Science
Peer Reviewed Peer Reviewed
Volume 10
Issue 1
Article Number eadi6678
Public URL


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