Back
Dracodinium modestum
Dracodinium modestum Iakovleva, 2016, p.5 (on PDF initially published online), pl.3, figs.3,6; text-fig.4b (part).
Holotype: Iakovleva, 2016, pl.3, figs.3,6.
Age: earliest Eocene.
Original description (Iakovleva, 2016):
Dracodinium? modestum sp. nov. Plate 3, figures 3, 6; Figure 4b
Holotype. Plate 3, figures 3, 6; slide MPA 62334-4. England Finder reference M39/3.
Type stratum and locality. Sample LT-60, ~148.8 m depth; base of the Sinceny Member; BRGM Scientific Borehole Le Tillet, Paris Basin, France.
Diagnosis. A species of Dracodinium with an ovoidal, circumcavate pericyst lacking lateral horns, and having a minute apical and two minute antapical horns.
Description. A mid-size ovoidal narrowly circumcavate pericyst. The pericoel is narrow. Apical horn minute; the lateral horns are absent; the antapical horns are very small and represent mostly outgrowths of the periphragm. The periphragm is ornamented by short processes that are distally bulbous. The processes are generally nontabular, but some indistinctly reflect the tabulation. The endocyst is subspherical; the endophragm is thin and smooth. Archaeopyle latiepeliform, operculum free.
Dimensions. Holotype: pericyst length 80 µm; pericyst width 73 µm; endocyst length 66 µm; endocyst width 65 µm.
Comparison. Dracodinium modestum differs from other Dracodinium species by its ovoidal ambitus, smaller size (pericyst length less than 90 µm), the absence of lateral horns and greatly reduced antapical horns. As some processes seem to indicate sutures, this species can be considered transitional between Dracodinium and Stichodinium; therefore, it is questionably included in Dracodinium.
Stratigraphical range. Earliest Eocene.
Derivation of name. From the Latin modestus in reference to the small (for wetzelielloids) size of the pericyst and almostabsent lateral and antapical horns.
Holotype: Iakovleva, 2016, pl.3, figs.3,6.
Age: earliest Eocene.
Original description (Iakovleva, 2016):
Dracodinium? modestum sp. nov. Plate 3, figures 3, 6; Figure 4b
Holotype. Plate 3, figures 3, 6; slide MPA 62334-4. England Finder reference M39/3.
Type stratum and locality. Sample LT-60, ~148.8 m depth; base of the Sinceny Member; BRGM Scientific Borehole Le Tillet, Paris Basin, France.
Diagnosis. A species of Dracodinium with an ovoidal, circumcavate pericyst lacking lateral horns, and having a minute apical and two minute antapical horns.
Description. A mid-size ovoidal narrowly circumcavate pericyst. The pericoel is narrow. Apical horn minute; the lateral horns are absent; the antapical horns are very small and represent mostly outgrowths of the periphragm. The periphragm is ornamented by short processes that are distally bulbous. The processes are generally nontabular, but some indistinctly reflect the tabulation. The endocyst is subspherical; the endophragm is thin and smooth. Archaeopyle latiepeliform, operculum free.
Dimensions. Holotype: pericyst length 80 µm; pericyst width 73 µm; endocyst length 66 µm; endocyst width 65 µm.
Comparison. Dracodinium modestum differs from other Dracodinium species by its ovoidal ambitus, smaller size (pericyst length less than 90 µm), the absence of lateral horns and greatly reduced antapical horns. As some processes seem to indicate sutures, this species can be considered transitional between Dracodinium and Stichodinium; therefore, it is questionably included in Dracodinium.
Stratigraphical range. Earliest Eocene.
Derivation of name. From the Latin modestus in reference to the small (for wetzelielloids) size of the pericyst and almostabsent lateral and antapical horns.