Florideophyceae is a class of

red algae Red algae, or Rhodophyta (, ; ), are one of the oldest groups of eukaryotic algae. The Rhodophyta also comprises one of the largest phyla of algae, containing over 7,000 currently recognized species with taxonomic revisions ongoing. The majority ...

. They were once thought to be the only algae to bear pit connections, but these have since been found in the filamentous stage of the

Bangiaceae Bangiaceae is a family of red algae in the order Bangiales. It contains laver, used to make laverbread, and various species in the genus of ''Pyropia'' are used to make nori. Genera Genera accepted in 2018; * '' Aspalatia'' Ercegovic * ''Ban ...

. They were also thought only to exhibit apical growth, but there are genera known to grow by intercalary growth. Most, but not all, genera have three phases to the

life cycle Life cycle, life-cycle, or lifecycle may refer to: Science and academia *Biological life cycle, the sequence of life stages that an organism undergoes from birth to reproduction ending with the production of the offspring * Life-cycle hypothesis ...

Classification

There are various classification schemes; see

. One option is to use the following:

Subclass Hildenbrandiophycidae

Hildenbrandiales Hildenbrandiales is an order of crustose forms red alga which bear conceptacles and produce secondary pit-connections. They reproduce by vegetative gemmae as well as tetrasporangia, which are produced inside the conceptacles. The way in which ...

Subclass Nemaliophycidae

* Acrochaetiales * Balbianiales * Balliales *

Batrachospermales Batrachospermales is an order of red algae Red algae, or Rhodophyta (, ; ), are one of the oldest groups of eukaryotic algae. The Rhodophyta also comprises one of the largest phyla of algae, containing over 7,000 currently recognized species w ...

* Colaconematales * Nemaliales * Palmariales * Entwisleiales * Thoreales

Subclass Corallinophycidae

Corallinales Coralline algae are red algae in the order Corallinales. They are characterized by a thallus that is hard because of calcareous deposits contained within the cell walls. The colors of these algae are most typically pink, or some other shade of re ...

* Corallinapetrales * Rhodogorgonales * Sporolithales The subclass Corallinophycidae was introduced in 2007.

Subclass Ahnfeltiophycidae

* Ahnfeltiales * Pihiellales

Subclass
Rhodymeniophycidae Florideophyceae is a class of red algae. They were once thought to be the only algae to bear pit connections, but these have since been found in the filamentous stage of the Bangiaceae. They were also thought only to exhibit apical growth, but ...

Bonnemaisoniales Bonnemaisoniales is an order of red algae in the class Florideophyceae. It includes 2 families; * Bonnemaisoniaceae - 25 spp. * Naccariaceae - 7 spp. The order has cosmopolitan distribution In biogeography, cosmopolitan distribution is th ...

* Ceramiales * Gelidiales * Gigartinales *

Gracilariales Gracilariales is an order of red algae Red algae, or Rhodophyta (, ; ), are one of the oldest groups of eukaryotic algae. The Rhodophyta also comprises one of the largest phyla of algae, containing over 7,000 currently recognized species with ...

* Halymeniales * Nemastomatales * Peyssonneliales * Plocamiales * Rhodymeniales * Acrosymphytales * Atractophorales * Catenellopsidales * Sebdeniales According to molecular clock analysis, Florideophyceae diverged from other red algae about 943 (817–1,049) million years ago. It split into Hildenbrandiophycidae ca. 781 (681–879) mya, Nemaliophycidae ca. 661 (597–736) mya and Corallinophycidae ca. 579 (543–617) mya, and ca. 508 (442–580) mya the split between Ahnfeltiophycidae and Rhodymeniophycidae occurred.Divergence time estimates and the evolution of major lineages in the florideophyte red algae - Nature
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References

External links

Tree of Life: Florideophyceae
{{Taxonbar, from=Q1002125