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Cambroclave

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Extinct class of enigmatic organisms

Cambroclave
Temporal range: Lower Cambrian– Middle Cambrian PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: incertae sedis
Class: †Cambroclavida
Conway Morris and Chen, 1991

Cambroclaves are a group of enigmatic, phosphatized, hollow spine-shaped sclerites, known from their geographically widespread Early to Middle Cambrian fossils, which occur exclusively in shallow waters within the photic zone. They were probably originally aragonitic. They are lobate with long spines protruding centrally; these spines are in some cases (e.g. Zhijinites) pillar-like, constituted of a bundle rods (originally aragonite?) with an Ionic-like appearance. Some taxa have been compared to spicules of ecdysozoan worms, whereas others likely belong to Protomelission-like organisms, which have been argued to be affiliated with the dasycladalean green algae and the bryozoans.


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References

  1. Wotte, Thomas (2009). "The Youngest Cambroclaves: Cambroclavus absonus from the Middle Cambrian of the Cantabrian Zone (Northwest Spain)". Journal of Paleontology. 83 (1): 128–134. doi:10.1666/08-039R.1.
  2. Porter, S. M. (2010). "Calcite and aragonite seas and the de novo acquisition of carbonate skeletons". Geobiology. 8 (4): 256–277. doi:10.1111/j.1472-4669.2010.00246.x. PMID 20550583.
  3. "Lower Cambrian cambroclaves (incertae sedis) from Xinjiang, China, with comments on the morphological variability of sclerites". Palaeontology. 40 (1). 167–189.
  4. Conway Morris, S.; Peel, J.S. (2010). "New palaeoscolecidan worms from the Lower Cambrian: Sirius Passet, Latham Shale and Kinzers Shale" (PDF). Acta Palaeontologica Polonica. 55 (1): 141–156. doi:10.4202/app.2009.0058.
  5. "Protomelission is a dasyclad alga and not a bryozoan". Nature. 2023.
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