The largest specimen found is 1.8 metres in diameter but is also incomplete. The largest known species of ammonite is Parapuzosia seppenradensis from the Late Cretaceous. FOUND, Agadir, Morocco AGE, MID CRETACEOUS: 112 - 99.6. View this item and discover similar for sale at 1stDibs - Large ammonite fossil, found on Coastal Sahara Desert in Morocco.

It was synonymized with Angolaites by Kennedy et al. no date: Formation: Fort Worth Period: Cretaceous (100 mya) Loc: Fort Worth, Tx. Formation: Duck Creek Period: Cretaceous (100-101 mya) Loc: Tarrant co., Tx. ZoГ« says, 'Ammonites were quite diverse and evolved rapidly, so if you sample stratigraphically through rocks, you can actually see the evolution and the changes through them.' How big were ammonites?ДЄmmonites came in a range of sizes, from just a few millimetres to times bigger, with larger sizes more common from the Late Jurassic onwards. AMX342 - OUR LARGEST EVER 25+ INCH MONSTROUS CRETACEOUS AMMONITE OCEAN FOSSIL ID, Perisphinctes sp. A cache of ammonites found close together. However, it is estimated that over 10,000 species of ammonite - possibly even over 20,000- have been discovered. Ammonites are an extinct group of marine animals of the subclass Ammonoidea in the class Cephalopoda, phylum Mollusca. But when ammonite fossils that looked unique were found in the past, they tended to be recorded as new species instead of as the microconch (male) or macroconch (female) of an existing species, as this difference between the sexes was not yet known about. The soft body of the creature occupied the largest segments of the shell at the end.

Ammonite fossils also reveal information about ancient climates. Fossilized ammonoids have been found showing teeth marks from such attacks. Like modern cephalopods, ammonites displayed sexual dimorphism, which is the noticeable difference in appearance between sexes. Most species, however, had coiled shells lined with progressively larger chambers. But figuring out exactly how many species have been found so far is a bit tricky.

Largest ammonite fossil