Having the shape of a tube; tube-shaped.
- Halysis is distinguished from the Microproblematicum Flabellia by not being tubiform.
- Lipina grouped these specimens, that show sheets of cells, together with others that are clearly tubiform, but we do not see convincing evidence that these specimens are taxonomically related.
- It has subsequently been interpreted as a tubiform green alga and as a cyanobacterium, and Ordovician specimens that are evidently Halysis have been referred to the filamentous green alga Oedogonium Link, 1820.
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