Rhodogorgonales

Rhodogorgonales
Scientific classification
(unranked):	Archaeplastida
Division:	Rhodophyta
Class:	Florideophyceae
Subclass:	Corallinophycidae
Order:	Rhodogorgonales; S.Fredericq, J.N.Norris & C.Pueschel
Family:	Rhodogorgonaceae; S.Fredericq, J.N.Norris & C.Pueschel
Species
	Renouxia Fredericq & Norris, 1995[1] ; Rhodogorgon Norris & Bucher, 1989[2] ;

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.[3] They have no fossil record.[4]

Unlike the corallinales and sporolithales, their closest relatives, these thalli are loose aggregations of hair-like cells, with the middle portion formed of rhizoid-like filaments. Spores are borne on the end of hair-like cells (cortical fascicles).[5]

Images can be seen in "Rhodogorgon ramosissima J. N. Norris & Bucher (Rhodogorgonales, Rhodogorgonaceae, Rhodophyta), registro nuevo para la Costa Venezolana". Acta Bot. Venez. 29 (2). 2006.

References

FREDERICQ, S.; NORRIS, J. N. (1995). "A new order (Rhodogorgonales) and family (Rhodogorgonaceae) of red algae composed of two tropical calciferous genera, Renouxia gen. nov. and Rhodogorgon". Cryptogamic Botany. 5: 316–331.
NORRIS J. N. (1) ; BUCHER K. E. (1989). "Rhodogorgon, an anamolous new red algal genus from the Caribbean Sea". Proceedings of the Biological Society of Washington. 102 (4): 1050–1066. ISSN 0006-324X.
Xiao, S.; Knoll, A.H.; Yuan, X.; Pueschel, C.M. (2004). "Phosphatized multicellular algae in the Neoproterozoic Doushantuo Formation, China, and the early evolution of florideophyte red algae". American Journal of Botany. 91 (2): 214–227. doi:10.3732/ajb.91.2.214. PMID 21653378.
Aguirre, J.; Perfectti, F.; Braga, J. C. (2010). "Integrating phylogeny, molecular clocks, and the fossil record in the evolution of coralline algae (Corallinales and Sporolithales, Rhodophyta)". Paleobiology. 36 (4): 519. doi:10.1666/09041.1.
Le Gall, L.; Payri, C.; Bittner, L.; Saunders, G. (2010). "Multigene phylogenetic analyses support recognition of the Sporolithales ord. Nov". Molecular Phylogenetics & Evolution. 54 (1): 302–305. doi:10.1016/j.ympev.2009.05.026. PMID 19490946.

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[1] FREDERICQ, S.; NORRIS, J. N. (1995). "A new order (Rhodogorgonales) and family (Rhodogorgonaceae) of red algae composed of two tropical calciferous genera, Renouxia gen. nov. and Rhodogorgon". Cryptogamic Botany. 5: 316–331.

[2] NORRIS J. N. (1) ; BUCHER K. E. (1989). "Rhodogorgon, an anamolous new red algal genus from the Caribbean Sea". Proceedings of the Biological Society of Washington. 102 (4): 1050–1066. ISSN 0006-324X.

[Xiao2004-3] Xiao, S.; Knoll, A.H.; Yuan, X.; Pueschel, C.M. (2004). "Phosphatized multicellular algae in the Neoproterozoic Doushantuo Formation, China, and the early evolution of florideophyte red algae". American Journal of Botany. 91 (2): 214–227. doi:10.3732/ajb.91.2.214. PMID 21653378.

[Aguirre2010-4] Aguirre, J.; Perfectti, F.; Braga, J. C. (2010). "Integrating phylogeny, molecular clocks, and the fossil record in the evolution of coralline algae (Corallinales and Sporolithales, Rhodophyta)". Paleobiology. 36 (4): 519. doi:10.1666/09041.1.

[Le_Gall2010-5] Le Gall, L.; Payri, C.; Bittner, L.; Saunders, G. (2010). "Multigene phylogenetic analyses support recognition of the Sporolithales ord. Nov". Molecular Phylogenetics & Evolution. 54 (1): 302–305. doi:10.1016/j.ympev.2009.05.026. PMID 19490946.