Orthotheca is a genus of sessile bottom-dwelling hyolith.[1]

References

  1. ^ a b Malinky, J. M. (2009). "First Occurrence of Orthotheca Novák, 1886 (Hyolitha, Early Devonian) in North America". Journal of Paleontology. 83 (4): 588–596. Bibcode:2009JPal...83..588M. doi:10.1666/08-164R.1. S2CID 130227630.


Allikas: https://en.wikipedia.org/wiki/Orthotheca
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