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Impagidinium inaequalis
Impagidinium inaequalis (Wall and Dale in Wall et al., 1973, p.22, pl.1, figs.7–8) Londeix et al., 2009, p.68.
Originally Spiniferites, subsequently (and now) Impagidinium.
Londeix et al. (2010, p.204) corrected an error to the basionym citation in Londeix et al. (2009), but the combination was still validated in the latter reference.
Holotype: Wall et al., 1973, pl.1, figs.7–8.
Locus typicus: Black Sea, core 1474 P
Age: Holocene.
Original diagnosis: Wall and Dale, 1973, p.22
Dinoflagellate cysts of the genus Spiniferites with a lageniform shape. The hypotract is broader than the epitract, and the antapex is transversely elongated.
Description: Wall and Dale, 1973, p.22
The hypotract is broader than the epitract and is subrectangular with a very broad, flat antapex, the width of which equals that of the test near the cingulum. A perfect reflected tabulation is given by very low sutural ridges, which present the typical pattern of Spiniferites, despite the unusual shape of the test. Several features of the tabulation are of special interest. On the epitract, the mid-ventral anterior sulcal platelet-area is extensive and contacts the fifth precingular area anterior to plate-area 6". On the hypotract, plate-area lp is large and subrectangular, while the antapical plate-area 1"""" and the adjoining posterior sulcal plateletarea (ppl) are transversely elongated. The archeopyle is mid-dorsal, simple and precingular with 3" equivalent. The surface of the test is scabrate to microgranular.
Dimensions: Length of body without spines 44-55 µm, width 33-43 µm, spines up to 5 µm long.
Originally Spiniferites, subsequently (and now) Impagidinium.
Londeix et al. (2010, p.204) corrected an error to the basionym citation in Londeix et al. (2009), but the combination was still validated in the latter reference.
Holotype: Wall et al., 1973, pl.1, figs.7–8.
Locus typicus: Black Sea, core 1474 P
Age: Holocene.
Original diagnosis: Wall and Dale, 1973, p.22
Dinoflagellate cysts of the genus Spiniferites with a lageniform shape. The hypotract is broader than the epitract, and the antapex is transversely elongated.
Description: Wall and Dale, 1973, p.22
The hypotract is broader than the epitract and is subrectangular with a very broad, flat antapex, the width of which equals that of the test near the cingulum. A perfect reflected tabulation is given by very low sutural ridges, which present the typical pattern of Spiniferites, despite the unusual shape of the test. Several features of the tabulation are of special interest. On the epitract, the mid-ventral anterior sulcal platelet-area is extensive and contacts the fifth precingular area anterior to plate-area 6". On the hypotract, plate-area lp is large and subrectangular, while the antapical plate-area 1"""" and the adjoining posterior sulcal plateletarea (ppl) are transversely elongated. The archeopyle is mid-dorsal, simple and precingular with 3" equivalent. The surface of the test is scabrate to microgranular.
Dimensions: Length of body without spines 44-55 µm, width 33-43 µm, spines up to 5 µm long.