Hyolitha
![](/Images/godic/202501/19/Hyoliths013657.JPG")
![Hyoliths from the Middle Ordovician of northern Estonia; these are internal molds.](/Images/godic/202501/19/Hyoliths023657.JPG")
![Haplophrentis carinatus from the Stephen Formation, Burgess Shale (Middle Cambrian), Burgess Pass, British Columbia, Canada.](/Images/godic/202501/19/Haplophrentis_Burgess_Shale3657.jpg")
Hyolitha are enigmatic animals with small conical shells known from the Palaeozoic Era.
Hyolithid
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