Arthrotheriformes
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Arthrotheriformes are the ancestral, primarily oceanic arthrotheres. Like other arthrotheres, they have articulated legs, fused gonopodia, and beak-like jaws.
Subgroups
Family Arthrotheriidae
Benthic arthrotheres which walk about on the ocean floor.
Family Crocoscorpiidae
Pelagic, predatory, Eurypterid-like arthrotheres.