thumb|Front portion of the body of Ctenacanthus concinnus (originally described as "C. clarkii") from the Devonian-age [[Cleveland Shale]] Ctenacanthus (from , 'comb' and , 'spine') is an extinct genus of ctenacanthiform chondrichthyan. Remains have been found in the Bloyd Formation (Carboniferous Period) of Arkansas and the Cleveland Shale (Devonian Period) of Ohio in the United States and in South America.
via Wikidata · CC0
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).