Rudistes

• (n. pl.) An extinct order or suborder of bivalve mollusks characteristic of the Cretaceous period; -- called also Rudista. See Illust. under Hippurite.
Found on http://thinkexist.com/dictionary/meaning/rudistes/

Rudistes

Ru·dis'tes noun plural [ New Latin , from Latin rudis rough.] (Paleon.) An extinct order or suborder of bivalve mollusks characteristic of the Cretaceous period; -- called also Rudista . See Illust. under Hippurite .
Found on http://www.encyclo.co.uk/webster/R/102
No exact match found