Orthotheca

Orthotheca Temporal range: Early Cambrian–Early Devonian[1] PreЄ Є O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca (?)
Class:	Hyolitha
Family:	Orthothecidae Sysoev, 1958
Genus:	Orthotheca Pichon, 1946
Species
O. shriveri Malinky 2009 Others, please add...

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: 588–596. doi:10.1666/08-164R.1.  edit