High Quality Content by WIKIPEDIA articles! Xiphogymnites is an extinct genus of cephalopod belonging to the Ammonite subclass. Ammonites, as they pertain specifically to the order Ammonitida, are an extinct group of marine animals belonging to the cephalopod subclass Ammonoidea. They are excellent index fossils, and it is often possible to link the rock layer in which they are found to specific geological time periods. The closest living relative of the Ammonitida is not the modern Nautilus, which they somewhat outwardly resemble, but rather the subclass Coleoidea (octopus, squid, and cuttlefish).

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