Umiaites is a Late Jurassic (Tithonian stage) ammonitid included in the Olcostephanidae which is part of the perisphinctaceae. The type is Umiaites rajnathi Spath, 1931.

Umiaites
Temporal range: U Jurassic (Tith)
Scientific classification
Kingdom:
Phylum:
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Family:
Olcostephanidae
Subfamily:
Spiticeratinae
Genus:
Umiaites

Spath, 1931

The shell of Umiaites is large, reaching a diameter of 16 cm or greater, and evolute with a wide shallow umbilicus. Flanks are flat to gently curving. Whorls overlap the previous by a fourth.

So far, Umiaites is known only from Kutch in western India and is considered endemic to the region. Related genera include Spiticeras and Proniceras, with different distribution.

References

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  • The Genus Umiates Spath, 1931 (Ammonoidea) from the Tithonian (Late Jurassic) of Kutch, Western India. [1]