Asteracanthus tenuis

Stumpf et al. (2021) revalidate Strophodus based on a new specimen of Asteracanthus ornatissimus that differs from the crushing teeth described as Strophodus by Louis Agassiz in the 1830s in being multicusped. Kumar et al. (2021) treat Strophodus tenuis as a species of Strophodus as originally described by Agassiz in their description of a new Strophodus species from India. To be honest, new morphological data from Asteracanthus makes clear that Arthur Woodward's synonymy of Strophodus with Asteracanthus was based only on the association of fin spines with teeth, because the original fossils of Asteracanthus were dorsal fin spines, not teeth. Note that the type species of Strophodus, S. longidens, is from the Bajocian-Bathonian interval, as is S. tenuis.

Kumar, K. & Bajpai, S. & Pandey, P. & Ghosh, T. & Bhattacharya, D. (2021): Hybodont sharks from the Jurassic of Jaisalmer, western India. Historical Biology in press

Stumpf, Sebastian; López‐Romero, Faviel A.; Kindlimann, René; Lacombat, Frederic; Pohl, Burkhard; Kriwet, Jürgen, 2021. A unique hybodontiform skeleton provides novel insights into Mesozoic chondrichthyan life. Papers in Palaeontology spp2.1350. doi:10.1002/spp2.1350. ISSN 2056-2799.