Halysis is a genus of red alga thought to fall in the coralline stem group. It has only been recovered in thin sections, and thus is only known in two dimensions; however, an interpretation as a sheet of cells rather than a sheet of tubes or a single row of cells is the most plausible.[1]
| Halysis Temporal range:
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Scientific classification 
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| Clade: | Archaeplastida |
| Division: | Rhodophyta |
| Class: | Florideophyceae |
| Stem group: | Corallinales |
| Genus: | †Halysis HØeg, 1932 |
| Species | |
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See also
edit- Coralline algae#Evolution
- Other stem-group corallines:
- Arenigiphyllum (Ordovician)
- Petrophyton (Ordovician : Caradoc)
- Graticula (Silurian : Wenlock)
- Halysis (Ordovician)
- Archaeolithophyllum (Pennsylvanian)
- ?Maimonachaetetes (Mississippian)
- ?Palaeoaplysina (Pennsylvanian – Permian; possibly an animal)
- ? Solenoporaceae (Ordovician)
References
edit- ^ Riding, R.; Braga, J. C. (2005). "Halysis Høeg, 1932 — An Ordovician coralline red alga?". Journal of Paleontology. 79 (5): 835. doi:10.1666/0022-3360(2005)079[0835:HHAOCR]2.0.CO;2. ISSN 0022-3360.
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