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Wikipedia definition
1. OphiacodontidaeOphiacodontidae is an extinct family of early synapsids from the Carboniferous and Permian. Archaeothyris, and Clepsydrops were among the earliest ophiacodontids, appearing in the Late Carboniferous. Some ophiacodonts were semi-aquatic, and few were fully aquatic, but some were fully terrestrial like Archaeothyris.
Read “Ophiacodontidae” on English Wikipedia
Read “オフィアコドン科” on Japanese Wikipedia
Read “Ophiacodontidae” on DBpedia

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