Red algae orders

Gigartinales is a red algae order in the class Florideophyceae.

Bangiales is an order of multicellular red algae of the class Bangiophyceae containing the families Bangiaceae, Granufilaceae, and possibly the extinct genus Rafatazmia with one species, Rafatazmia chitrakootensis. They are one of the oldest eukaryotic organisms, possibly dating back to 1.6 billion years old. Many species are used today as food in different cultures worldwide. Their sizes range from microscopic (Bangiomorpha) to up to two meters long (Wildemania occidentalis). Many of its species are affected by Pythium porphyrae, a parasitic oomycete. Similar to many other species of red

Palmariales is an order of marine algae. It includes the edible seaweed dulse (Palmaria palmata).

Compsopogonales is an order of mostly fresh water red algae.

thumb|right|Acrosorium uncinatum Ceramiales is an order of red algae. It was established by Friedrich Oltmanns in 1904.

The Gelidiales is a small order of red algae containing ten genera, and approximately 130–160 species, many of which are used to make agar.

Halymeniales is an order of red algae belonging to the class Florideophyceae and the subclass Rhodymeniophycidae.

Acrochaetiales is an order of red algae.

Bonnemaisoniales is an order of red algae in the class Florideophyceae.

Nemaliales is an order of red algae.

REDIRECT Stylonemataceae

Erythropeltidales is a red algae order in the class Compsopogonophyceae. ==Species== Erythropeltidales Erythropeltidaceae Erythrotrichiaceae Chlidophyllon Erythrocladia Erythropeltis Erythrotrichia Porphyropsis Porphyrostromium Pyrophyllon Sahlingia Smithora

Gracilariales is an order of red algae.

thumb|Nemastomatales

REDIRECT Porphyridiaceae

Batrachospermales is an order of red algae.

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 the tetraspores are produced is unusual enough to justify the formation of this distinct order. Some members of the order are known from freshwater rivers as well.

REDIRECT Thoreaceae

REDIRECT Compsopogonophyceae

The Rhodogorgonales are an order of red algae, a sister group to the corallines. They are always thalloid and calcified; their calcification is very different from the corallines, as individual calcite crystals are deposited in the cell wall of specialised cells; this suggests that the evolution of calcification may have been independent from the corallines. They have no fossil record.