Ammonitoidea definitions

Ammonitoidea

• (n. pl.) An extensive group of fossil cephalopods often very abundant in Mesozoic rocks. See Ammonite.
Found on http://thinkexist.com/dictionary/meaning/ammonitoidea/

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Ammonitoidea

Am·mon`i·toid'e·a noun plural [ New Latin , from Ammonite + -oid .] (Zoology) An extensive group of fossil cephalopods often very abundant in Mesozoic rocks. See Ammonite .
Found on http://www.encyclo.co.uk/webster/A/71

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