Pneumatoarthrus is an extinct genus of sea turtle known from the Late Cretaceous (early Maastrichtian) Mount Laurel Formation of Monmouth County, New Jersey. Many experts consider Pneumatoarthrus a senior synonym of Archelon. If this classification is correct, it would have reached 4-5 meters in length with a fin span of up to 5 meters, and weighed over 2.3 tons. Only a single species, P. peloreus, is known.
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).