Asteroceras and Promicroceras, ammonites
Asteroceras (large shells) and Promicroceras (small shells) ammonites, seen here in a rock specimen from the Lower Lias, Marston Magna, near Yeovil, Somerset.
Size: 2883px × 3625px
Photo credit: © Natural History Museum, London / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ammonite, ammonites, ammonitida, ammonoid, ammonoidea, anatomy, animal, arietitidae, asteroceras, cephalopod, cephalopoda, coil, eoderocerataceae, eoderoceratidae, invertebrata, invertebrate, marine, marston, mollusc, mollusca, mollusk, promicroceras, rib, shell, yeovil
