Observations on some Actinoporellas (Chlorophyta, Polyphysaceae). Revision of the Jacques Emberger Collection. Part 1

[摘要] On the occasion of the inventory of the J. Emberger Collection, specimens from the "Lower Cretaceous" (Valanginian and Hauterivian) of Algeria, which are referable to the genus Actinoporella ( Gümbel in Alth ) and which were earlier identified to its type-species A. podolica ( Alth ) by Conrad et al. , are re-examined. They correspond to two discrete species, one of which could be a junior synonym of A. podolica , a synonymy that remains pending because it would require a new sampling at the original locality in western Ukraine some 140 years after the original specimens, now lost, were collected. Regarding their age ascription, they are Tithonian and/or Berriasian in age, i.e. , latest Jurassic ( sensu Oppel ) in age, not earliest Cretaceous. In addition to these two Actinoporellas, a third discrete species, initially described as Clypeina nigra ( Conrad & Peybernès ), but later referred to the genus Actinoporella , is revised. New data justify its re-ascription to the genus Bakalovaella Bucur . Finally, it is now confirmed that both the Polyphysaceae and the modern Dasycladaceae derive from the Diploporaceae either directly or indirectly through the ancestral Dasycladaceae.

[学科分类] 地质学