Ermoceras

Ermoceras is a thomboceratid ammonite from the Middle Jurassic ( u Baj) of central Arabia, Sinai, and Algeria with strong primary and secondary ribs and a single row of lateral tubercles; described as having a deep ventral groove Telermoceras, with low, depressed whorls, and Kosmermoceras with high,compressed whorls are considered subgenera of Erm...
Found on http://en.wikipedia.org/wiki/Ermoceras
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