Belemnoid, a type of cephalopod that roamed the oceans from the Devonian till their extinction at th
Belemnoid, a type of cephalopod that roamed the oceans from the Devonian till their extinction at the end of the Cretaceous. They were similar to today’s squid or cuttlefish (except with ten arms and no tentacles, rather than eight arms and two tentacles… because you needed to know).Normally only the bullet-shaped back of the internal shell is found fossilized; these were known as thunderstones because they were believed to be the result of lightning strikes. -- source link
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