Rhodogorgonales

Rhodogorgonales
Scientific classification
Phylum: Rhodophyta
Class: Florideophyceae
Subclass: Corallinophycidae
Order: Rhodogorgonales
Family: Rhodogorgonaceae
Genera
  • Renouxia Fredericq & Norris, 1995[1]
  • Rhodogorgon Norris & Bucher, 1989[2]

The Rhodogorgonales are an order of red alga, 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 Acta Bot. Venez 29 (2). 2006. http://www.scielo.org.ve/scielo.php?script=sci_arttext&pid=S0084-59062006000200005&lng=en&nrm=iso&ignore=.html. 

References

  1. ^ "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. 1995. 
  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. 
  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. http://www.amjbot.org/cgi/content/full/91/2/214. 
  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.  edit
  5. ^ Le Gall, L.; Payri, C.; Bittner, L.; Saunders, G. (2010). "Multigene phylogenetic analyses support recognition of the Sporolithales ord. Nov". Molecular phylogenetics and evolution 54 (1): 302–305. doi:10.1016/j.ympev.2009.05.026. PMID 19490946.  edit
Rhodophyta
Glaucocystophyceae
Viridiplantae/
Plantae
sensu stricto