Wikipedia
Umiaites
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.
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.