Abstract
Abstract. Durotrigia daveyi gen. et sp. nov. is described from the Inferior Oolite (Early Bajocian) of Dorset, England. It is the earliest distinctly tabulated gonyaulacacean dinocyst with a precingular archaeopyle. The archaeopyle is apparently variable, involving the loss of between 1 and 5 precingular plates. This variability poses some interesting taxonomic problems, particularly the implications to the value of the archaeopyle type as a high-level classification criterion. Some possible causes of archaeopyle variability are discussed.
Highlights
In a study of palynological assemblages from the Bajocian interval in a borehole in Lyme Bay, Davey observed two previously undescribed gonyaulacacean dinocysts from the [ueviuscula and sauzei ammonite zones
I and I1 belong to a single species with variable detachment of precingular plates
The archaeopyle is formed by the loss of 1 to 5 precingular plates (1P-5P)
Summary
In a study of palynological assemblages from the Bajocian interval in a borehole in Lyme Bay, Davey (in Penn et al, 1980) observed two previously undescribed gonyaulacacean dinocysts from the [ueviuscula and sauzei ammonite zones. INTRODUCTION In a study of palynological assemblages from the Bajocian interval in a borehole in Lyme Bay, Davey (in Penn et al, 1980) observed two previously undescribed gonyaulacacean dinocysts from the [ueviuscula and sauzei ammonite zones. I “loses more than one precingular plate in archaeopyle formation”. 11, apparently had a single plate (3”) precingular archaeopyle. Significant numbers of similar forms to those described by Davey
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