Hamulinidae is an extinct ammonoid cephalopod family belonging to the order Ammonitida. with and (1996), Mollusca 4 Revised, Cretaceous Ammonoidea, vol. 4, in Treatise on Invertebrate Paleontology, Part L (Roger L. Kaesler et el. eds.), Boulder, Colorado: The Geological Society of America & Lawrence, Kansas: University of Kansas Press, pp. 230-232. These cephalopod were fast-moving nektonic carnivores. They lived during the Lower Cretaceous period (Lower Barremian - Upper Barremian).
Description
The long main shaft is followed by a hook and a shorter, close, parallel or slightly divergent final shaft. The ammonitic suture is with a subtrifid L. The U is usually reduced or indifferentiated in adults.
Genera Amorina Anahamulina Hamulina
Notes
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