Abstract
A study of heteromorph ammonoids from the Hauterivian – Barremian succession of the south-western Crimea, has prompted revision the genus Paraspiticeras Kilian. The results suggest that Paraspiticeras was probably descended from the early Hauterivian heteromorph Crioceratites by recoiling of the spiral. Its taxonomic position as representative of Subfamily Paraspiticeratinae Vermeulen, 2009 of Family Emericiceratidae Vermeulen, 2004 of Superfamily Ancyloceratoidea Gill, 1871 seems to be reasonable. The genus can be split into 3 subgenera: P. (Paraspiticeras) s.s., P. (Blascoceras) and Paraspiticeras (Lepinayceras). The absence of the descendants of Paraspiticeras in the late Barremian makes impossible to consider it as the direct ancestor of the Aptian Douvilleiceratoidea.
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