franzanth: Orthoceras, the straightest of them…

franzanth:

Orthoceras, the straightest of them all

Like, its name literally means “straight horn.”

This 480+ million-year-old friend is a pin-up kid that has appeared in books about prehistoric life since, forever. The name Orthoceras used to refer to all straight-shelled cephs, but it was discovered that there are multiple similar yet unrelated species that live at different times throughout history.

Most Orthoceras images on the internet and in picture books show them to have a hood above its eyes like Nautilus. Recent studies have found that the hood is a specific adaptation belonging to Nautilus and its closest relatives only, which means something as old as Orthoceras likely had no hood.

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