page_title: Trinacromerum
section_title: Classification
hierarchical_section_title: Trinacromerum / Classification
caption_attribution_description: Trinacromerum fossil at ROM
context_page_description: Trinacromerum is an extinct genus of sauropterygian reptile, a member of the polycotylid plesiosaurs. It contains two species, T. bentonianum and T. kirki. Specimens have been discovered in the Late Cretaceous fossil deposits of what is now modern Kansas and Manitoba.
context_section_description: Below is a cladogram of polycotylid relationships from Ketchum & Benson, 2011.
caption: Profile view of a cast of a Manitoban specimen of Trinacromerum kirki
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