Back
Miocene protoperidiniacean dinoflagellate cysts from the Maryland and Virginia coastal plain
| De Verteuil, L. and Norris, G. | |
| 1992 | |
| In: Head and Wrenn, 1992; Neogene and Quaternary dinoflagellate cysts and acritarchs, AASP FoundatI | |
| Miocene protoperidiniacean dinoflagellate cysts from the Maryland and Virginia coastal plain |
De Verteuil, L. and Norris, G., 1992; Miocene protoperidiniacean dinoflagellate cysts from the Maryland and Virginia coastal plain. In: Head and Wrenn, 1992; Neogene and Quaternary dinoflagellate cysts and acritarchs, AASP Foundation, 391-431 Abstract Eight new dinocyst species, and one new subspecies, of probable protoperidiniacean affinity, are described from Miocene diatom-rich, fine sandy and silty shallow marine facies of the Maryland and Virginia coastal plain. Analogous morphology, stratigraphic context, and the presence of a pigmented cyst, can together be used to suggest protoperidiniacean affinity for these species. Trinovantedinium capitatum Reid and T. applanatum (Bradford) Bujak & Davies are synonymous, the latter being senior and the type species for the genus: biological affinity is with the living thecate stage Protoperidinium (Protoperidinium) pentagonum (Gran) Balech 1974. The generic concept of Trinovantedinium is emended and broadened to acknowledge the presence of two wall layers, and to include pigmented cysts. Two new combinations are proposed: T. glorianum Head et al. comb. nov. and T. variabile Bujak comb. nov. The new species Trinovantedinium ferugnomatum, T. harpagonium, and T. papulum are described from the middle and upper Miocene. The other new taxa are Selenopemphix armageddonensis, S. brevispinosa subsp. conspicua, Sumatradinium soucouyantae, Sumatradinium? delectabilis, Trinovantedinium? xylochoporum, and Quadrina? condita.