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Pterodinium cingulatum ssp. reticulatum
Pterodinium cingulatum ssp. reticulatum (Davey and Williams, 1966) Lentin and Williams, 1981
Originally Hystrichosphaera cingulata var. reticulata, subsequently Spiniferites cingulatus ssp. reticulatus, thirdly Spiniferites? cingulatus ssp. reticulatus, fourthly (and now) Pterodinium cingulatum ssp. reticulatum.
Tax. sr. synonym of Hystrichosphaera cingulata var. perforata Clarke and Verdier, 1967, according to Clarke et al., 1968.
Holotype: Davey and Williams, 1966, pl.1, fig.10; pl.2, fig.4
Locus typicus: Fetchum Mill, Surrey, England
Stratum typicum: Cenomanian
Original diagnosis: Davey and Williams, 1966, p. 39: Hystrichosphaera cingulata ssp. reticulata
A variety of H. cingulata with central body composed of smooth endophragm and strongly reticulate periphragm often somewhat thickened. Gonal " processes " not protruding above sutural crests, processes acting more or less as supporting structures for crests. Processes simple or terminating with small bifurcation.
Dimensions: holotype: diameter of central body 40 by 55 µm, height of crests up to 14 µm. Range: diameter of central body 33-59 µm, height of crests up to 17 µm.
Originally Hystrichosphaera cingulata var. reticulata, subsequently Spiniferites cingulatus ssp. reticulatus, thirdly Spiniferites? cingulatus ssp. reticulatus, fourthly (and now) Pterodinium cingulatum ssp. reticulatum.
Tax. sr. synonym of Hystrichosphaera cingulata var. perforata Clarke and Verdier, 1967, according to Clarke et al., 1968.
Holotype: Davey and Williams, 1966, pl.1, fig.10; pl.2, fig.4
Locus typicus: Fetchum Mill, Surrey, England
Stratum typicum: Cenomanian
Original diagnosis: Davey and Williams, 1966, p. 39: Hystrichosphaera cingulata ssp. reticulata
A variety of H. cingulata with central body composed of smooth endophragm and strongly reticulate periphragm often somewhat thickened. Gonal " processes " not protruding above sutural crests, processes acting more or less as supporting structures for crests. Processes simple or terminating with small bifurcation.
Dimensions: holotype: diameter of central body 40 by 55 µm, height of crests up to 14 µm. Range: diameter of central body 33-59 µm, height of crests up to 17 µm.