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Name: Perisphinctes sp.
Age: Lower Jurassic
Location Found: Tulear, Madagascar
Perisphinctes is an prehistoric genus of ammonite cephalopod that lived in the lower Jurassic 163 million years ago.
Ammonites are one of the most recognisable fossils around, this is due to their familiar spiral shape shell, reminiscent of what we know as a snail shell, though these creatures are not related to snails at all! They were marine animals, present between 240 – 65 million years ago, who had a coiled external shell like that of the modern nautilus, and although they resembled a modern-day nautilus, these molluscs are more closely related to living coleoids (i.e. octopuses, squid, and cuttlefish!)
These creatures varied in size, ranging from only a few millimetres to some fossils being found measuring a whopping 8 feet (96 inches)!!