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Plantae |
Department of Geology, Sedgwick Museum, Downing Street, Cambridge
Department of Geology, The University, Mappin Street, Sheffield 1
Department of Botany, British Museum (Natural History), Cromwell Road, London S W 7
Department of Geology, The University, Nottingham
For convenience, certain unicellular planktonic algae and their associates have been assembled here separately from the remainder of the thallophytes. The acritarchs are included here because of their Mesozoic and later association with dinoflagellates, although they are almost certainly polygenetic.
In the coccoliths and dinoflagellates, taxa have been recorded at a lower level than elsewhere in the volume because of current difficulties in their classification and because of their increasing stratigraphical interest.
[N.F.H.]
Class CHRYSOPHYCEAE
Order CHRYSOMONADALES
Suborder COCCOLITHINEAE
Genera which can with reasonable confidence be regarded as fossil Chrysophyceae have been placed in one or other of the families used for living plants; to these the extinct Discoasteraceae should probably be added. Under the heading genera incertae sedis is a list of nano-fossils which are commonly preserved in close association with calcareous planktonic algae, but whose systematic relationships are in doubt; some of these may indeed be the remains of animals.
Where the stratigraphical or geographical range of a taxon is known to extend beyond the limits mentioned in published records, the extended range is also given. A number of recently proposed genera whose stratigraphical ranges cannot be established without substantial nomenclatural revision of pre-existing taxa have been omitted, since such a revision is beyond the scope of this work.
Family COCCOLITHACEAE (= Coccolithidae Poche 1913) Genus ALVEARIUM Black 1965 First and Last, Jur Hett: A. dorsetense Black, L. Lias, Dorset, England (Black 1965). Genus ARKHANGELSKIELLA Vekshina 1959 First, Cret Turon: A. oblique Stradner, Klementer Schichten, Austria (Stradner 1964).
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This 250-word extract was created in the absence of an abstract.
