Abstract
Re-discovery of the holotype of “Micropeltis” isseli Airaghi, 1901, in the collection of the Museo di Paleontologia (University of Genova), allowed for a re-assessment of its morphological features and revision of its systematic placement. The discovery of ambulacral plate compounding that is compatible with that of phymosomatids, in combination with its pore arrangement and tuberculation pattern, indicates that this species should be transferred to the genus Phymotaxis. Comparison with museum collections from the type area allowed for clarification of the type-locality and stratum. The specimen most likely derives from the Tortonian Marne di S. Agata Fossili beds exposed at Bocca d’Asino, northeast of Stazzano, which is in line with Airaghi’s statement in the original description (in contrast to the original plate caption). This indicates that Phymotaxis isseli is the youngest representative of the echinoid order phymosomatida known to date, extending its range to the Late Miocene.
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