Polysacos

Polysacos is an extinct genus of multiplacophorans (chitons) known from articulated Carboniferous fossils; its seventeen shell plates are arranged in three rows, with seven iterated units. It demonstrates that multiplacophora are related to modern polyplacophora.[1] It was fringed with a ring of hollow spines resembling those of the Ordovician Echinochiton.[1]

Polysacos
Temporal range:
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Polyplacophora
Order: †Multiplacophora
Genus: †Polysacos
Vendrasco et al., 2004
Species:
†P. vickersianum
Binomial name
†Polysacos vickersianum
Vendrasco et al., 2004

References
  1. Vendrasco, M. J.; Wood, T. E.; Runnegar, B. N. (2004). "Articulated Palaeozoic fossil with 17 plates greatly expands disparity of early chitons". Nature. 429 (6989): 288–291. Bibcode:2004Natur.429..288V. doi:10.1038/nature02548. PMID 15152250.


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