. . "Stethacanthidae"@en . "Stethacanthidae"@en . . "A pair of Stethacanthus altonensis."@en . . "Stethacanthidae is an extinct family of sharks existed during the Carboniferous period. These sharks resembled falcatids except that a spine-brush complex emerged from the dorsum."@en . "*Stethacanthus\n*Akmonistion"@en . "250"^^ . . . . "Stethacanthidae"@en . . . "Stethacanthidae is an extinct family of sharks existed during the Carboniferous period. These sharks resembled falcatids except that a spine-brush complex emerged from the dorsum."@en . .