Abstract
Abstract Nine species of Dinogymnium [including D. elongatum n. sp., D. lanceolatum n. sp., D. pustulicostatum n. sp., and D. westralium (Cook‐son and Eisenack) Evitt et al 1967 emended herein] from the Upper Cretaceous Monmouth Group of Atlantic Highlands, New Jersey, are discussed. Scanning electron microscopy reveals in detail the fine structure of D. pustulicostatum and D. westralium. Wall canals (Evitt, Clarke, and Ver‐dier, 1967) pass through the single‐layered wall, and their arrangement at the surface appears to be of taxonomic value. Flagellar pore structures and associated curved ridges and grooves suggest motili‐ty and that the fossil tests are not cysts (Evitt and Davidson, 1964, p. 8). The type of flagellar pore structures present on a given species also appears to be of taxonomic value. Dominance of D. pustulicostatum (45–64 percent) combined with low phytoplankton species diversity (19 species average per sample) suggests an estuarine paleoenvironment for the upper Mount Laurel Sand (sample...
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