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- noun Plural form of
Sorry, no etymologies found.
The dorsal conic spine-like structures could be a homology of cuticular spicules of polyplacophorans and aplacophorans.
For instance, an elaborated head and eyes did not occur in primitive molluscs before the level of Conchifera; serial pairs of gills are seen only in the Polyplacophora and Tryblidia; and an oval foot is known in Tryblidia, polyplacophorans and archaeogastropods only Brusca & Brusca 2002; Ruppert et al.