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Pterodinium cingulatum ssp. polygonale
Pterodinium cingulatum subsp. polygonale (Clarke and Verdier, 1967, p.47, pl.8, figs.7–8; text-fig.20) Paul et al., 1994, p.722.
Originally Hystrichosphaera cingulata var. polygonalis, subsequently Spiniferites cingulatus subsp. polygonalis, thirdly Spiniferities? cingulatus subsp. polygonalis, fourthly (and now) Pterodinium cingulatum subsp. polygonale.
Taxonomic senior synonyms (at specific rank): Hystrichosphaera (now Spiniferites) crassimurata, according to Clarke et al. (1968, p.181) and Cymatiosphaera (now Pterodinium?) pterota, according to Pavlishina (1990, p.95) — however, Paul et al. (1994, p.722) retained Hystrichosphaera cingulata subsp. polygonalis (as Pterodinium cingulatum subsp. polygonale).
Holotype: Clarke and Verdier, 1967, pl.8, fig.7; Jan du Chêne et al., 1986a, pl.89, figs.7–9.
Age: Cenomanian.
Original diagnosis: Clarke and Verdier, 1967, p.46
A variety of H. cingulata having a linear depressed area on each side of the ledges thereby separating a more elevated central plate area from the ledges. Both the plates and ledges are smooth.
Measurements: Holotype, Range
Overall length 60 µm, 55-65 µm
Overall breadth 50 µm, 50-58 µm
Height of ledges 8 µm, 8-11 µm
Affinities:
Clarke and Verdier, 1967, p.46: H. cingulata var. polygonalis differs from H. cingulata var. cingulata in the presence of the striae around the plate margins.
Originally Hystrichosphaera cingulata var. polygonalis, subsequently Spiniferites cingulatus subsp. polygonalis, thirdly Spiniferities? cingulatus subsp. polygonalis, fourthly (and now) Pterodinium cingulatum subsp. polygonale.
Taxonomic senior synonyms (at specific rank): Hystrichosphaera (now Spiniferites) crassimurata, according to Clarke et al. (1968, p.181) and Cymatiosphaera (now Pterodinium?) pterota, according to Pavlishina (1990, p.95) — however, Paul et al. (1994, p.722) retained Hystrichosphaera cingulata subsp. polygonalis (as Pterodinium cingulatum subsp. polygonale).
Holotype: Clarke and Verdier, 1967, pl.8, fig.7; Jan du Chêne et al., 1986a, pl.89, figs.7–9.
Age: Cenomanian.
Original diagnosis: Clarke and Verdier, 1967, p.46
A variety of H. cingulata having a linear depressed area on each side of the ledges thereby separating a more elevated central plate area from the ledges. Both the plates and ledges are smooth.
Measurements: Holotype, Range
Overall length 60 µm, 55-65 µm
Overall breadth 50 µm, 50-58 µm
Height of ledges 8 µm, 8-11 µm
Affinities:
Clarke and Verdier, 1967, p.46: H. cingulata var. polygonalis differs from H. cingulata var. cingulata in the presence of the striae around the plate margins.