Now that Shark Week is over, let's all take a moment to appreciate some of our other friends from beneath the sea.
"The cephalopods (Greek plural Κεφαλόποδα (kephalópoda); "head-feet") are the mollusc class Cephalopoda characterized by bilateral body symmetry, a prominent head, and a modification of the mollusk foot, a muscular hydrostat, into the form of arms or tentacles. Teuthology, a branch of malacology, is the study of cephalopods.
"The class contains two extant subclasses. In the Coleoidea, the mollusk shell has been internalized or is absent; this subclass includes the octopuses, squid, and cuttlefish. In the Nautiloidea, the shell remains; this subclass includes the nautilus. About 800 distinct living species of cephalopods have been identified. Two important extinct taxa are Ammonoidea, the ammonites, and Belemnoidea, the belemnites."
The 54th plate from Ernst Haeckel's Kunstformen der Natur (1904), depicting organisms classified as Gamochonia. Text from Wikipedia.
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