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Most ammonites are homomorph
along the neck and tail that may have formed a thick
000 pounds (2300 kg)
were up to 7 feet (2
Crinoid Calyx (head) Alamosaurus Most ammonites are homomorphCrinoids are commonly known as sea lilies due to their "flower like" appearance , though they are animals, not plants. Crinoids are echinoderms related to starfish, sea urchins, and brittle stars. Like other members of their phylum they are spiny skinned, have a five sided or pentaradial symmetry as adults and a calcium carbonate endoskeleton. Although crinoids are the least understood of living echinoderms, their skeletal remains are among the most
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