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Canningia exilimura
Canningia exilimura, Vieira and Mahdi, 2021, p. 5
Holotype: Plate 2, figure 1, Vieira and Mahdi, 2021
Type locality: Møre Basin (Norway)
Stratigraphic extent: Late Cretaceous, late Campanian–early Maastrichtian
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Original description: [Vieira and Mahdi, 2021, p. 5]:
Diagnosis:
Proximate, subspherical to lenticular dinoflagellate cyst. The cingulum and tabulation are not often clear. The antapical region bears two weakly developed blunt protrusions. The periphragm is thin, scabrate to minutely granulate, while the endophragm is thicker (up to 2 µm) ornamented with dense grana.
Description:
Proximate dinoflagellate cyst of intermediate size, subspherical to lenticular in shape, length and breadth of cyst are almost equal; more often the breadth is slightly greater. Separation of the periphragm and endophragm can occasionally be seen at the cingulum and antapical regions.
The periphragm is thin and scabrate to minutely granulate.
The endophragm has a thickness of up to 2 µm, ornamented with dense grana. The antapical region is rounded to slightly concave between two protrusions; the left antapical protrusion is consistently present, whereas the right may be reduced or absent.
The archaeopyle is apical type tA, with a small, broad bulge, the operculum is occasionally present. The angular suture line indicates six precingular plates. The tabulation is not clear and is indicated mainly by the archaeopyle.
Central body dorso-ventrally compressed, with two rounded, slightly indented protrusions at the cingulum.
Dimensions:
Central body length 52 (66) 78 µm, width 71 (92) 99 µm, length of apical horn 4 (6) 8 µm.
20 specimens measured
Affinities/Comparison:
The distinct thin scabrate to minutely granulate endophragm of the central body differentiates this new species from other species within the genus. In C. colliveri the cyst body is longer than wide and its surface is ornamented with grana and spines. Canningia scabrosa differs in having an irregular outline and very short and narrow hair-like appearance.
Holotype: Plate 2, figure 1, Vieira and Mahdi, 2021
Type locality: Møre Basin (Norway)
Stratigraphic extent: Late Cretaceous, late Campanian–early Maastrichtian
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: [Vieira and Mahdi, 2021, p. 5]:
Diagnosis:
Proximate, subspherical to lenticular dinoflagellate cyst. The cingulum and tabulation are not often clear. The antapical region bears two weakly developed blunt protrusions. The periphragm is thin, scabrate to minutely granulate, while the endophragm is thicker (up to 2 µm) ornamented with dense grana.
Description:
Proximate dinoflagellate cyst of intermediate size, subspherical to lenticular in shape, length and breadth of cyst are almost equal; more often the breadth is slightly greater. Separation of the periphragm and endophragm can occasionally be seen at the cingulum and antapical regions.
The periphragm is thin and scabrate to minutely granulate.
The endophragm has a thickness of up to 2 µm, ornamented with dense grana. The antapical region is rounded to slightly concave between two protrusions; the left antapical protrusion is consistently present, whereas the right may be reduced or absent.
The archaeopyle is apical type tA, with a small, broad bulge, the operculum is occasionally present. The angular suture line indicates six precingular plates. The tabulation is not clear and is indicated mainly by the archaeopyle.
Central body dorso-ventrally compressed, with two rounded, slightly indented protrusions at the cingulum.
Dimensions:
Central body length 52 (66) 78 µm, width 71 (92) 99 µm, length of apical horn 4 (6) 8 µm.
20 specimens measured
Affinities/Comparison:
The distinct thin scabrate to minutely granulate endophragm of the central body differentiates this new species from other species within the genus. In C. colliveri the cyst body is longer than wide and its surface is ornamented with grana and spines. Canningia scabrosa differs in having an irregular outline and very short and narrow hair-like appearance.