''Tetraedron'' is a

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...

green algae The green algae (singular: green alga) are a group consisting of the Prasinodermophyta and its unnamed sister which contains the Chlorophyta and Charophyta/Streptophyta. The land plants (Embryophytes) have emerged deep in the Charophyte alga as ...

in the family

Hydrodictyaceae Hydrodictyaceae is a family of green algae in the order Sphaeropleales. Genera * '' Euastropsis'' * '' Helierella'' * '' Hydrodictyon'' * '' Lacunastrum'' * '' Monactinus'' * '' Parapediastrum'' * ''Pediastrum ''Pediastrum'' is a genus of ...

Species list

* '' T. acutum'' * '' T. arthrodesmiforme'' * '' T. bifurcatum'' * '' T. caudatum'' * '' T. conicum'' * '' T. constrictum'' * '' T. cruciatum'' * '' T. cruciforme'' * '' T. curvatum'' * '' T. gigas'' * '' T. gracile'' * '' T. granulosum'' * '' T. hastatum'' * '' T. hortense'' * '' T. incus'' * '' T. limneticum'' * '' T. lobulatum'' * '' T. longispinum'' * '' T. minimum'' * '' T. minutissimum'' * '' T. minutum'' * '' T. muticum'' * '' T. obtusum'' * '' T. octaedricum'' * '' T. pachydermum'' * '' T. planctonicum'' * '' T. proteiforme'' * '' T. pusillum'' * '' T. rectangulare'' * '' T. regulare'' * '' T. reticulatum'' * '' T. simmeri'' * '' T. staurastroides'' * '' T. striatum'' * '' T. triangulare'' * '' T. trigonum'' * '' T. trilobatum'' * '' T. tumidulum'' * '' T. vulgare'' * '' T. wasteneysii''

References

Sphaeropleales genera Sphaeropleales {{Chlorophyceae-stub