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algae animal axial ribs bivalve brown Buccinum undatum Calyptraea canine tooth carnivorous predator circalittoral colour beige colour very variable colour whitish conical Conidae conspicuous Costa Crepidula fornicata Cupra Marittima Diet docoglossan dorsal Example of rachiglossan external tooth FISSURELLIDAE Gastropods greyish gutter-shaped Habitat herbivorous hook-shaped horny operculum inconspicuous interior nacreous intertidal zone l1 to l5 Lamellaria perspicua Linnaeus last whorl lateral denticulations lateral teeth l1 Linne Littorina littorea marginal teeth ma1 median and lateral median tooth wide molluscs multicuspidate MURICIDAE Nassarius number of teeth Ocenebra erinacea odontoblasts Patella vulgata PATELLIDAE pectinate pennanti periostracum Plate pointed apex Polinices catena preying Prosobranch purple rachiglossan radula radula fig radular formula rhipidoglossan rocky shores serrated sharp-pointed triangular siphonal canal short slightly curved smooth species spiral bands spiral ridges spiral striae squamous strong central cusp strong cusps suture teeth very numerous thick thin and curved topsnail Trivia arctica umbilicus usual widened base