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Dinogymnium digitus ssp. digitus
Dinogymnium digitus ssp. digitus
Autonym.
Holotype: Deflandre, 1935, text-figs.7-8; Deflandre, 1936b, pl.2, figs.4-5.
Age: Senonian.
Comment (May, 1977):
Two specimens observed in the Mount Laurel Sand have somewhat expanded epitracts and elongate, but conical, and antapically rounded hypotracts. Although the Mount Laurel specimens lack costae on the epitract, Deflandre's (1935, page 225, text-figures 7-8) specimen apparently has faint longitudinal markings. The presence or absence of the markings on the epitract is likely a factor of intraspecific variability or lateral distorsion. Vozzhennikova (1967, plate V, figs. 5, 6, 12) illustrated epitracts devoid of longitudinal costae and others faint costae. The Mount Laurel specimens, as with Deflandre's (ibid.), have longitudinal costae on the hypotract. Surface ornamentation is faintly postulose. Archeopyle is apical and narrow and the operculum appears ventrally and dorsally attached.
Dimensions: Two specimens observed and measured: length 74-77 µm, width 25-28 µm. Epitract length: 34-37 µm, hypotract length: 40 µm.
Occurence: Mount Laurel Sand, extremely rare. Previously reported occurence: Senonian of France (Deflandre 1935), of Australia (Cookson and Eisenack), Upper Cretaceous of the Soviet Union (Vozzhennikova, 1967).
Autonym.
Holotype: Deflandre, 1935, text-figs.7-8; Deflandre, 1936b, pl.2, figs.4-5.
Age: Senonian.
Comment (May, 1977):
Two specimens observed in the Mount Laurel Sand have somewhat expanded epitracts and elongate, but conical, and antapically rounded hypotracts. Although the Mount Laurel specimens lack costae on the epitract, Deflandre's (1935, page 225, text-figures 7-8) specimen apparently has faint longitudinal markings. The presence or absence of the markings on the epitract is likely a factor of intraspecific variability or lateral distorsion. Vozzhennikova (1967, plate V, figs. 5, 6, 12) illustrated epitracts devoid of longitudinal costae and others faint costae. The Mount Laurel specimens, as with Deflandre's (ibid.), have longitudinal costae on the hypotract. Surface ornamentation is faintly postulose. Archeopyle is apical and narrow and the operculum appears ventrally and dorsally attached.
Dimensions: Two specimens observed and measured: length 74-77 µm, width 25-28 µm. Epitract length: 34-37 µm, hypotract length: 40 µm.
Occurence: Mount Laurel Sand, extremely rare. Previously reported occurence: Senonian of France (Deflandre 1935), of Australia (Cookson and Eisenack), Upper Cretaceous of the Soviet Union (Vozzhennikova, 1967).