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Hallucigenia sparsa is a small Cambrian lobopodian known from fossils in the Burgess Shale of British Columbia, Canada. Its unusual anatomy led early researchers to reconstruct it upside down, treating its paired legs as dorsal tentacles and its stiff dorsal spines as supports for walking. Later dis...
Orthacanthus is a freshwater xenacanthiform shark named by Agassiz in 1843 and known as a Carboniferous to Permian swamp predator.
Doliodus problematicus is an Early Devonian cartilaginous fish from New Brunswick, notable for fossils linking shark traits with acanthodian-like spines.
Ctenacanthus is a Paleozoic ctenacanthiform shark genus named by Louis Agassiz in 1837, noted for comb-like dorsal fin spines.
Akmonistion is an Early Carboniferous chondrichthyan from Bearsden, Scotland, named in 2001 and noted for an anvil-like dorsal fin.
