Rhodymeniophycidae
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Florideophyceae is a class of exclusively multicellular
red algae Red algae, or Rhodophyta (, ; ), make up one of the oldest groups of eukaryotic algae. The Rhodophyta comprises one of the largest Phylum, phyla of algae, containing over 7,000 recognized species within over 900 Genus, genera amidst ongoing taxon ...
. 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 there are genera known to grow by intercalary growth. Most, but not all, genera have three phases to the life cycle. In the subclass Nemaliophycidae there are three orders, Balbianiales, Batrachospermales, and Thoreales, which lives exclusively in freshwater.Complete mitochondrial genomes of six species of the freshwater red algal order Batrachospermales (Rhodophyta)
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Classification

There are various classification schemes; see
red algae Red algae, or Rhodophyta (, ; ), make up one of the oldest groups of eukaryotic algae. The Rhodophyta comprises one of the largest Phylum, phyla of algae, containing over 7,000 recognized species within over 900 Genus, genera amidst ongoing taxon ...
. One option is to use the following:


Subclass Hildenbrandiophycidae

* Hildenbrandiales


Subclass

Nemaliophycidae Florideophyceae is a class of exclusively multicellular 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 ...

* Acrochaetiales * Balbianiales * Balliales * Batrachospermales * Colaconematales * Nemaliales * Palmariales * Entwisleiales * Thoreales


Subclass Corallinophycidae

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


Subclass Ahnfeltiophycidae

* Ahnfeltiales * Pihiellales


Subclass Rhodymeniophycidae

* Bonnemaisoniales * Ceramiales * Gelidiales * Gigartinales * Gracilariales * 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.


References


External links


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