| Permocalculus | |
|---|---|
Scientific classification  | |
| (unranked): | Archaeplastida |
| Division: | Rhodophyta |
| Class: | incertae sedis |
| Family: | † Gymnocodiaceae |
| Genus: | † Permocalculus G. F. Elliott, 1955 |
Permocalculus is a genus of red algae known from Permian to Cretaceous strata. [1] Closely aligned to Gymnocodium , it is placed in the Gymnocodiaceae. [2]
The Prorocentrales are a small order of dinoflagellates. They are distinguished by having their two flagella inserted apically, rather than ventrally as in other groups. One flagellum extends forward and the other circles its base, and there are no flagellar grooves. This arrangement is called desmokont, in contrast to the dinokont arrangement found in other groups. Accordingly, the Prorocentrales may be called desmoflagellates, and in some classifications were treated as a separate class Desmophyceae.
The glaucophytes, also known as glaucocystophytes or glaucocystids, are a small group of freshwater unicellular algae, less common today than they were during the Proterozoic. Only 15 species have been described, but more species are likely to exist. Together with the red algae (Rhodophyta) and the green algae plus land plants, they form the Archaeplastida. However, the relationships among the red algae, green algae and glaucophytes are unclear, in large part due to limited study of the glaucophytes.
The Fucales (fucoids) are an order in the brown algae. The list of families in the Fucales, as well as additional taxonomic information on algae, is publicly accessible at Algaebase.
AlgaeBase is a global species database of information on all groups of algae, as well as one group of flowering plants, the sea-grasses.
The Trebouxiophyceae are a class of green algae, in the division Chlorophyta. Their circumscription within the green algae is not well established due to the need for more genetic studies at higher levels within the group.
Chaetophorales is an order of green algae in the class Chlorophyceae.
The Rivulariaceae are a family of cyanobacteria within the Nostocales in which the filaments (trichomes) are tapered from wider at the base to narrower at the tip.
Onslowiaceae is the only family in order Onslowiales in the brown algae. The family contains only the genera Onslowia and Verosphacela.
Nemoderma is the only genus in the family Nemodermataceae and order Nemodermatales of the brown algae. The genus contains only a single species, Nemoderma tingitanum.
Scytothamnales is an order of brown algae.
Ralfsiales is an order of crustose brown algae containing two families.
Gymnocoidum is a genus of calcareous alga known from Permian strata. For details of its classification, see Gymnocodiaceae.
This family of alga is known from Permian to Cretaceous strata. It has been aligned with the chlorophytes and rhodophytes; whilst the latter is the most widely held opinion, some authors still consider a green algal affinity possible.
Mamiellophyceae is a class of green algae in the division Chlorophyta.
Pyramimonadophyceae is a class of green algae in the division Chlorophyta.
Pyramimonadaceae is a family of green algae.
Michael Dominic Richard Guiry, is an Irish botanist, who specialises in phycology (algae). See for example the articles. He is the founder and director of the algal database, AlgaeBase.