Description (link Algaebase): "Red algae with unicellular, pseudofilamentous or filamentous bodies inhabiting mesophilic freshwater and marine environments. Members of this group do not develop macroscopic, pseudoparenchymatous or parenchymatous seaweed-type thalli as those of the Eurhodophytina; variable plastid morphologies and organellar associations; plastid genomes with a large number of introns and a quadripartite organization where the rRNA operon-containing inverted repeats are divergent relative to the small single copy region."
Di seguito sono riportate solo le specie che risultano presenti nel Mediterraneo.
ERYTHROPELTALES
- Erythrotrichiaceae
- Erythrocladia, E. irregularis Rosevinge
- Erythrocladia, E. polystromatica P.J.L. Dangeard
- Erythrotrichia, E. carnea (Dillwyn) J. Agardh
- Erythrotrichia, E. investiens (Zanardini) Bornet
- Porphyrostromium, P. boryanum (Montagne) P.C. Silva
- Porphyrostromium, P. ciliare (Carmichael) M.J. Wynne
- Sahlingia, S. subintegra (Rosevinge) Kornmann
RHODOCHAETALES
- Rhodochaetaceae
- Rhodochaete, R. pulchella Thuret ex Bornet
STYLONEMATALES
- Stylonemataceae:
- Chroodactylon, C. ornatum (C. Agardh) Basson
- Goniotrichopsis (senza pirenoidi), G. reniformis (?)
- Stylonema, S. alsidii (Zanardini) K.M.Drew
- Stylonema, S. cornu-cervi Reinsch
