內角石（學名：Endoceras）是一屬已滅絕的鸚鵡螺類。生存在奧陶紀的海洋中。巨大的內角石長度約為13英呎（3.5公尺），是生活在古生代海洋中的巨大生物之一。成年的內角石可能是隱藏在海底的伏擊型掠食者，必要時移動以取得優勢。
物種[1]
- Endoceras annuliferum
- Endoceras aristides
- Endoceras baculoides
- Endoceras baylorense
- Endoceras calvini
- Endoceras champlainense
- Endoceras deparcum
- Endoceras durinum
- Endoceras eburneolum
- Endoceras fulgur
- Endoceras glaucus
- Endoceras hageri
- Endoceras hudsoni
- Endoceras indigator
- Endoceras knighti
- Endoceras lamottense
- Endoceras lawrencense
- Endoceras logani
- Endoceras magister
- Endoceras microlobatum
- Endoceras perannulatum
- Endoceras philipsburgense
- Endoceras primigenium
- Endoceras proteiforme
- Endoceras raymondi
- Endoceras richardsoni
- Endoceras sansabaense
- Endoceras seticornium
- Endoceras tityrus
- Endoceras trundlesense
- Endoceras warthini
- Endoceras yellvillense
參考文獻
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