Resumen de A new family of Paleo-Mesozoic calcareous green siphons-Algae (order bryopsidales, classs bryopsidophyceae, phylum siphonophyta)
Detley K. Richter, Mihai Popa, Bárbel Kube, Anca Sarbu, Ovidiu Dragastan, Ion Ciugulea
Three new families (Avrainvilleaceae, Rhipiliaceace, Pseudoudoteaceae) of noncalcareous and calcareous algae belonging to the Order Bryopsidales are described. They include many controversial taxa (Garwoodia, Hedstroemia, Bevocastria, "Polytrichella", Mitcheldeania, Pseudomitcheldeania, Cayeuxia sp. 1, C. sp. 2, C. sp. 3, Baratangia), genera long time disputed, well known as filamentous algae and assigned by different authors to Cyanophyta, to Porostromata or to filamentous Codiaceae (Chlorophyta).
The Pseudoudoteaceae familia nova (Type genus Pseudoudotea n. gen.) includes two distinct groups which provide characteristic inner morphology: one Ecorticated and another Corticated (having various degrees of cortication). The thalli are crossed by siphons radially disposed, simple or branched. The walls of the siphons correspond to a sheath crossed by pores or in some cases without pores. Seven new taxa are described, of which the internal structure was compared to the one of various Recent species of Udotea, Rhipidosiphon, Penicillus, Avrainvillea, Rhipilia, Rhipiliopsis and Rhipiliella.
The discovery of the Family Pseudoudoteaceae including Paleo-Mesozoic calcareous algae resembles to a "missig link", and could be an "open key" for understanding the relationships and the evolution between the fossil and modern taxa, especially from the Order Bryopsidales.
