Limpet
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Limpets are a group of aquatic snails with a conical shell shape (patelliform) and a strong, muscular foot. This general category of conical shell is known as "patelliform" (dish-shaped). Existing within the class Gastropoda, limpets are a polyphyletic group.
The true limpet species Patella vulgata on a rock surface in Wales
Underside of a Patella vulgata specimen
SEM images of the different shapes of teeth in the following limpet species: (A) Nacella mytilina; (B) N. clypeater; (C) N. chiloensis; (D) N. deaurata; (E) N. delicatissima; (F) N. magellanica; (G) N. venosa
Limpet homescar found at the Bay of Skaill
Barnacle
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Barnacles are arthropods of the subclass Cirripedia in the subphylum Crustacea. They are related to crabs and lobsters, with similar nauplius larvae. Barnacles are exclusively marine invertebrates; many species live in shallow and tidal waters. Some 2,100 species have been described.
Whale barnacles on a humpback whale
Nauplius larva of Elminius modestus
Cypris larva of Amphibalanus improvisus