Back
Selenopemphix septum
Selenopemphix septum Heilmann-Clausen and Van Simaeys, 2005, p.178,180, pl.11, figs.8–10.
Holotype: Heilmann-Clausen and Van Simaeys, 2005, pl.11, fig.8. N.I.A.
Age: ?earliest Oligocene.
Original description (Heilmann-Clausen and Van Simaeys, 2005)
Description. Dinoflagellate cysts belonging to the genus Selenopemphix. The autocyst is subcircular in apical/ antapical view. The epicyst and hypocyst are short; the epicyst is subconical. On the hypocyst, two small spines may be present on the antapical corners. The broad paracingulum is bordered by high septa with smooth distal margins. Radial fine folds or striae are usually present on the septa. The autophragm is smooth. The archeopyle is intercalary, Type I (2a), and occurs in a slightly leftward, asymmetric position. The paratabulation is expressed by the archeopyle and the paracingular septa. Folds or ridges are usually present on the epicyst and hypocyst and may possibly mark parasutures.
Derivation of name. From Latin septum, meaning partition, with reference to the high septa bordering the paracingulum.
Designation of holotype. Plate 11, fig. 8, Slide 1775 F2, England Finder coordinates K37/3-L37/1. MGUH 27787. Kysing coastal cliff, sample 1775, ?lowermost Oligocene. Specimen dimensions: Total cyst breadth 84 µm; total cyst thickness 74 µm; height of septa 8–12 µm.
Designation of paratype. Plate 11, fig. 9, Slide 1773 F3, England Finder coordinates U55/4-V55/2. MGUH 27788. Kysing-1 borehole, sample 1773, ?lowermost Oligocene.
Dimensions of measured specimens. Total cyst breadth 65 (75) 84 µm. Total cyst thickness 58 (68) 82 µm. Maximum height of septa 7 (14) 19 µm. (14 specimens measured).
Comparison. Selenopemphix septum sp. nov is a typical species of the genus Selenopemphix except for its high paracingular septa. The only other species with high, smooth septa is Selenopemphix warriensis Biffi & Grignani 1983 from the Oligocene of Nigeria. Selenopemphix warriensis differs by having less high septa (4–7 µm), an elliptical autocyst and a wrinkled autophragm. Selenopemphix weileri Pross 1997, from the Oligocene of Germany, has similarly high septa, but the distal margin is denticulate.
Holotype: Heilmann-Clausen and Van Simaeys, 2005, pl.11, fig.8. N.I.A.
Age: ?earliest Oligocene.
Original description (Heilmann-Clausen and Van Simaeys, 2005)
Description. Dinoflagellate cysts belonging to the genus Selenopemphix. The autocyst is subcircular in apical/ antapical view. The epicyst and hypocyst are short; the epicyst is subconical. On the hypocyst, two small spines may be present on the antapical corners. The broad paracingulum is bordered by high septa with smooth distal margins. Radial fine folds or striae are usually present on the septa. The autophragm is smooth. The archeopyle is intercalary, Type I (2a), and occurs in a slightly leftward, asymmetric position. The paratabulation is expressed by the archeopyle and the paracingular septa. Folds or ridges are usually present on the epicyst and hypocyst and may possibly mark parasutures.
Derivation of name. From Latin septum, meaning partition, with reference to the high septa bordering the paracingulum.
Designation of holotype. Plate 11, fig. 8, Slide 1775 F2, England Finder coordinates K37/3-L37/1. MGUH 27787. Kysing coastal cliff, sample 1775, ?lowermost Oligocene. Specimen dimensions: Total cyst breadth 84 µm; total cyst thickness 74 µm; height of septa 8–12 µm.
Designation of paratype. Plate 11, fig. 9, Slide 1773 F3, England Finder coordinates U55/4-V55/2. MGUH 27788. Kysing-1 borehole, sample 1773, ?lowermost Oligocene.
Dimensions of measured specimens. Total cyst breadth 65 (75) 84 µm. Total cyst thickness 58 (68) 82 µm. Maximum height of septa 7 (14) 19 µm. (14 specimens measured).
Comparison. Selenopemphix septum sp. nov is a typical species of the genus Selenopemphix except for its high paracingular septa. The only other species with high, smooth septa is Selenopemphix warriensis Biffi & Grignani 1983 from the Oligocene of Nigeria. Selenopemphix warriensis differs by having less high septa (4–7 µm), an elliptical autocyst and a wrinkled autophragm. Selenopemphix weileri Pross 1997, from the Oligocene of Germany, has similarly high septa, but the distal margin is denticulate.