''Unipeltoceras'' is an extinct

ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely related to living coleoids (i.e., octopuses, squid and cuttlefish) ...

genus included in the perisphictacian family,

Aspidoceratidae The Aspidoceratidae comprise a family of middle and upper Jurassic ammonites that make up part of the superfamily Perisphinctoidea, characterized by evolute shells, commonly stocky, that tend to develop tubercles. The Aspidoceratidae are thought ...

, and a member of the subfamily

Peltoceratinae The Peltoceratinae comprise a subfamily in the Aspidoceratidae, (middle and upper Jurassic perisphinctacean ammonites). Genera in the Peltoceratinae have sharply ribbed inner whorls and outer whorls that bear spines or tubercles, or have coarse ...

, that lived during the Callovian stage, late in the Middle Jurassic. ''Unipeltoceras'' is characterized by its strongly evolute, discoidal shell with sharp ribbing on the inner whorls and differing from ''

Peltoceras ''Peltoceras'' is an extinct ammonite genus from the aspidoceratid subfamily Peltoceratinae that lived during the later part of the Middle Jurassic (U Callovian In the geologic timescale, the Callovian is an age and stage in the Middle Juras ...

'', s.s. by having only an outer row of tubercles on the outer whorls.

References

*Arkell, et al., 1957. Mesozoic Ammonoidea. Treatise on Invertebrate Paleontology, Part L (Ammonoidea). Geol Soc of America and Univ Kansas Press. p. L336 Jurassic ammonites Ammonitida genera Ammonites of Europe Callovian life Aspidoceratidae {{Ammonite-stub