Xenodiscidae
Код 2464450
- ISBN: 978-5-5120-1490-5
Код 2464450
High Quality Content by WIKIPEDIA articles! The Xenodiscidae are the earliest of the Ceratitida and comprise Middle and Upper Permian genera characterized by compressed, discoidal, evolute shells with rounded to acute venters and commonly with lateral ribs. Sutures are goniatitic to weakly ceratitic.
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