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Cladopyxidium saeptum
From Fensome et al., 2019:
Cladopyxidium saeptum (Morgenroth, 1968, p.536–537, pl.41, figs.7–9; pl.42, fig.1) Stover and Evitt, 1978, p.30. Holotype: Morgenroth, 1968, pl.41, fig.7; Eisenack and Kjellström, 1971, p.516a; Fensome et al., 1995, fig.1 — p.1755. Originally Microdinium, subsequently (and now) Cladopyxidium. Taxonomic junior synonyms: Microdinium robustum and Cladopyxidium septatum, both according to Stover and Evitt (1978, p.30). The nomenclatural type of the genus Cladopyxidium remains the holotype of Cladopyxidium septatum. Age: Danian.
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Original description: [Morgenroth, 1968] (translated from German):
Derivatio nominis: saeptum lat.: The fenced one.
Paratypoids: M19, M20, M24, M25, M26.
Holotype: The specimen preserved in prep. M23 and illustrated on Plate 41, Fig. 7.
Locus typicus: Mönsted near Viborg.
Stratum typicum: Danien A.
Diagnosis: A species of the genus Microdinium. Tabulation scheme: 1', 6", 6, 6'", p, 1"". The small, ellipsoidal carapace exhibits distinct fielding. The panel borders are usually occupied by strong, smooth-edged seams, which, however, (in rare cases) may be completely absent The apex is characterized by a zigzag apical plate, which is shed during archeopyl formation. On the epitheca, there are also six preequatorial plates, which are trapezohedral except for 1" and 6" (triangular outline!). The relatively broad, equatorial girdle furrow, differentiated by six plates, runs circularly to weakly left-handed-spiral. It is interrupted on the ventral side by a broad longitudinal furrow, which is differentiated by four small plates at the level of the girdle and widens at the mortgage and epitheca. The mortgage is characterized by six trapezohedral postequatorial plates, one intercalary plate, and one hexagonal antapical plate.
Dimensions:
Theca length: 18 μ (15 μ/22 μ)
Theca width: 16 μ (14 μ/20 μ)
Seam height: 1-2 μ
(100 measurements)
Number of specimens examined: 340.
Occurrence: The species was also found in the Saltholm Limestone of Annetorp.
Comparisons: So far, only the species ornatum COOKSON & EISENACK is known from the genus Microdinium. Microdinium saeptum n. sp. differs from this mainly
1. by the presence of an equatorial belt that divides the theca into an approximately equal-sized epitheca and hypotheca,
2. by the longitudinal furrow differentiated by four plates at the level of the belt.
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Notes:
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Cladopyxidium saeptum (Morgenroth, 1968) Stover and Evitt, 1978. Description as for genus with tabulation delineated by membranes. Note broad sulcus with small plates.
Size: length 15-22 µm, width 14-20 µm, height of crests 1-2 µm.
Cladopyxidium saeptum (Morgenroth, 1968, p.536–537, pl.41, figs.7–9; pl.42, fig.1) Stover and Evitt, 1978, p.30. Holotype: Morgenroth, 1968, pl.41, fig.7; Eisenack and Kjellström, 1971, p.516a; Fensome et al., 1995, fig.1 — p.1755. Originally Microdinium, subsequently (and now) Cladopyxidium. Taxonomic junior synonyms: Microdinium robustum and Cladopyxidium septatum, both according to Stover and Evitt (1978, p.30). The nomenclatural type of the genus Cladopyxidium remains the holotype of Cladopyxidium septatum. Age: Danian.
---------------------------------------------------------------------------------------------------
Original description: [Morgenroth, 1968] (translated from German):
Derivatio nominis: saeptum lat.: The fenced one.
Paratypoids: M19, M20, M24, M25, M26.
Holotype: The specimen preserved in prep. M23 and illustrated on Plate 41, Fig. 7.
Locus typicus: Mönsted near Viborg.
Stratum typicum: Danien A.
Diagnosis: A species of the genus Microdinium. Tabulation scheme: 1', 6", 6, 6'", p, 1"". The small, ellipsoidal carapace exhibits distinct fielding. The panel borders are usually occupied by strong, smooth-edged seams, which, however, (in rare cases) may be completely absent The apex is characterized by a zigzag apical plate, which is shed during archeopyl formation. On the epitheca, there are also six preequatorial plates, which are trapezohedral except for 1" and 6" (triangular outline!). The relatively broad, equatorial girdle furrow, differentiated by six plates, runs circularly to weakly left-handed-spiral. It is interrupted on the ventral side by a broad longitudinal furrow, which is differentiated by four small plates at the level of the girdle and widens at the mortgage and epitheca. The mortgage is characterized by six trapezohedral postequatorial plates, one intercalary plate, and one hexagonal antapical plate.
Dimensions:
Theca length: 18 μ (15 μ/22 μ)
Theca width: 16 μ (14 μ/20 μ)
Seam height: 1-2 μ
(100 measurements)
Number of specimens examined: 340.
Occurrence: The species was also found in the Saltholm Limestone of Annetorp.
Comparisons: So far, only the species ornatum COOKSON & EISENACK is known from the genus Microdinium. Microdinium saeptum n. sp. differs from this mainly
1. by the presence of an equatorial belt that divides the theca into an approximately equal-sized epitheca and hypotheca,
2. by the longitudinal furrow differentiated by four plates at the level of the belt.
-------------------------------------------------------------------------------------------------------------------------------
Notes:
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Cladopyxidium saeptum (Morgenroth, 1968) Stover and Evitt, 1978. Description as for genus with tabulation delineated by membranes. Note broad sulcus with small plates.
Size: length 15-22 µm, width 14-20 µm, height of crests 1-2 µm.