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| Main Authors: | , , , , , , , , , , |
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| Format: | Artículo científico |
| Language: | en |
| Published: |
Science advances
2025
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| Subjects: | |
| Online Access: | https://pubmed.ncbi.nlm.nih.gov/40700488/ |
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Table of Contents:
- A fossilized ventral ganglion reveals a chaetognath affinity for Cambrian nectocaridids. 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 Animals Fossils Phylogeny Ganglia Biological Evolution Nectocaridids are enigmatic Palaeozoic animals with a controversial phylogenetic position. Previous hypotheses have placed them in their own phylum, chordates, molluscs (specifically cephalopods), or radiodont panarthropods. We describe here a nectocaridid, gen. et sp. nov. from the early Cambrian (~519 million years) Sirius Passet Lagerstätte of North Greenland. Key specimens preserve paired, phosphatized arcuate structures consistent with preservation of a ventral ganglion, a feature characteristic of extant and fossil chaetognaths, including the amiskwiid also from Sirius Passet. shares a gnathostomulid-like jaw apparatus, lateral fins, subterminal anus, and large antennae with and , placing nectocaridids in the chaetognath stem lineage. The complex sensory anatomy of nectocaridids, which is partially shared with other extinct amiskwiids, highlights a more dynamic predatory lifestyle much higher in the trophic food chain during early chaetognath evolution.