1. Subclass: EOGASTROPODA
Ponder & Lindberg, 1996
[= PROSOBRANCHIA Milne Edwards, 1848 p.p.; = AZYGOBRANCHIA
Spengel, 1881 p.p.]
"The clade Eogastropoda was defined by Ponder and Lindberg 1997 to
distinguish the most primitive gastropods from their more derived cousins.
This was based on the argument that the limpets (Patellacea/Patelloidea/Patellina),
originally classified as "archaeogastropods" because of soft-part
anatomy [Moore, et al. 1952, p.309 ], and considered specialised descendants
of Pleurotomariaceans, are actually a group of much more primitive survivors
from the original gastropod radiation..." Palaeo.com
the Eogastropoda, comprising the true limpets - Patellogastropoda - and
their extinct, probably coiled, ancestors
"Members of the family Patellidae can be found worldwide in both temperate and tropical seas. The shells are limpet-shaped and often radially ribbed. The spatula (inside of the apex) often has a different colour from the rest of the shell, a feature used in identification. .." Capricornica.com
Genus: Patella, Helcion
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