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Canninginopsis maastrichtiensis
From Fensome et al., 2019:
Canninginopsis maastrichtiensis Slimani, 1994, p.97–98, pl.16, figs.5–8,13–14.
Emendation: McLachlan et al., 2018, p.680–681.
Holotype: Slimani, 1994, pl.16, figs.5–7; Fensome et al., 2019a, figs.14I–K.
Taxonomic junior synonym: Canninginopsis verrucosa (name not validly published), according to Slimani (2001a, p.192).
Age: late Maastrichtian.
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Original description: [Slimani, 1994] translation PKB 2024
Derivation of the name: Maastricht, town in the region in which the type locality, the Halembaye quarry, is located.
Holotvpe: Halembaye ech. 43, preparation 2, coord. E.F. U29.
Type locality: Halembaye ex. 43.
Typical horizon: Upper Maastrichtian. (Member of Vijlen).
Synonymy: 1974: Canninginopsis verrucosa in W I L S O N, p. 216-217. pl. 20. fig. 7-9, text-fig. 35.
Diagnosis: Canninginopsis cyst, lenticular to pentagonal with an apical protrusion and two unequal antapical protrusions of which the left one is more elongated. The autophragm is typically decorated with solid warts and/or granules (0.5 to 3 µm in size), the smallest of which are constantly observed on the paracingulum. Paratabulation is weakly indicated by low (maximum 3 µm), solid, smooth or rarely wavy ridges. It conforms to the following formula: 4', 5-6", ?c, 5-6"', lp, 1"". The archaeopyle is apical (tA) type, with an attached or rarely free operculum.
Dimensions: Holotype: length: 64 µm, width: 52 µm. Variations: length with lid: 60 - 70 µm, length without lid: 58 - 65 µm. Width: 54 - 62 µm. Number of specimens measured: 10. Material: 18 specimens.
Description: The endophragm is thin and in contact with the periphragm (2 to 6 µm thick) which is thicker on the apical and antapical margin and especially around the protrusions. The size, distribution, and density of warts and granules may vary from one individual to another. The apical protrusion is slightly pointed, while the aniapical protrusions are rounded, the left one can reach up to 12 µm in length. The paracingulum, which reaches up to 5 µm in width, is non-segmented and very strongly laevotatory, the displacement between its two ends is up to 20 µm. The parasulcus is expressed by a smooth ventral surface that extends from the edge of the archaeopyle toward the antapex. The archaeopyle is apical (tA) type with a zig-zag margin and an operculum attached laterally or free.
Comparison: This species is distinguished from all species of the genus Canninginopsis published so far, especially by its characteristic warty ornamentation. However, it corresponds to C. verrucosa by Wilson (1974) uned.
Stratigraphic distribution: Halembaye: sample. 37 to 74, Maastrichtian sup. (Zone to B. junior). In Wilson (1974), Maastrichtian sup. (junior Zone - casimurovensis Zone), Maastricht region.
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Fensome et al., 2019a:
Emended diagnosis. A species of Canninginopsis possessing an outer wall occasionally forming spongeous thickenings along distal apical and antapical horn margins. Tabulation indicated by archaeopyle and alignment of sutural ornamentation comprised of dense granules or verrucae. Sulcus sinuous, clearly demarcated.
Remarks. Both Wilson (1974) and Slimani (1994) note the significant thickening of the wall layers around the margins of the apical and antapical horns (up to 6 lm) but from their material, the outer wall was not observed to have assumed a spongeous, porous quality as is the case in some Hornby Island specimens (e.g. Plate 4, figures 5, 9). Occurrence. Canninginopsis maastrichtiensis is present from 40 to 372 m in the Northumberland Formation section exposed from the south-eastern coast northward to Collishaw Point.
Canninginopsis maastrichtiensis Slimani, 1994, p.97–98, pl.16, figs.5–8,13–14.
Emendation: McLachlan et al., 2018, p.680–681.
Holotype: Slimani, 1994, pl.16, figs.5–7; Fensome et al., 2019a, figs.14I–K.
Taxonomic junior synonym: Canninginopsis verrucosa (name not validly published), according to Slimani (2001a, p.192).
Age: late Maastrichtian.
---------------------------------------------------------------------------------------------------
Original description: [Slimani, 1994] translation PKB 2024
Derivation of the name: Maastricht, town in the region in which the type locality, the Halembaye quarry, is located.
Holotvpe: Halembaye ech. 43, preparation 2, coord. E.F. U29.
Type locality: Halembaye ex. 43.
Typical horizon: Upper Maastrichtian. (Member of Vijlen).
Synonymy: 1974: Canninginopsis verrucosa in W I L S O N, p. 216-217. pl. 20. fig. 7-9, text-fig. 35.
Diagnosis: Canninginopsis cyst, lenticular to pentagonal with an apical protrusion and two unequal antapical protrusions of which the left one is more elongated. The autophragm is typically decorated with solid warts and/or granules (0.5 to 3 µm in size), the smallest of which are constantly observed on the paracingulum. Paratabulation is weakly indicated by low (maximum 3 µm), solid, smooth or rarely wavy ridges. It conforms to the following formula: 4', 5-6", ?c, 5-6"', lp, 1"". The archaeopyle is apical (tA) type, with an attached or rarely free operculum.
Dimensions: Holotype: length: 64 µm, width: 52 µm. Variations: length with lid: 60 - 70 µm, length without lid: 58 - 65 µm. Width: 54 - 62 µm. Number of specimens measured: 10. Material: 18 specimens.
Description: The endophragm is thin and in contact with the periphragm (2 to 6 µm thick) which is thicker on the apical and antapical margin and especially around the protrusions. The size, distribution, and density of warts and granules may vary from one individual to another. The apical protrusion is slightly pointed, while the aniapical protrusions are rounded, the left one can reach up to 12 µm in length. The paracingulum, which reaches up to 5 µm in width, is non-segmented and very strongly laevotatory, the displacement between its two ends is up to 20 µm. The parasulcus is expressed by a smooth ventral surface that extends from the edge of the archaeopyle toward the antapex. The archaeopyle is apical (tA) type with a zig-zag margin and an operculum attached laterally or free.
Comparison: This species is distinguished from all species of the genus Canninginopsis published so far, especially by its characteristic warty ornamentation. However, it corresponds to C. verrucosa by Wilson (1974) uned.
Stratigraphic distribution: Halembaye: sample. 37 to 74, Maastrichtian sup. (Zone to B. junior). In Wilson (1974), Maastrichtian sup. (junior Zone - casimurovensis Zone), Maastricht region.
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Fensome et al., 2019a:
Emended diagnosis. A species of Canninginopsis possessing an outer wall occasionally forming spongeous thickenings along distal apical and antapical horn margins. Tabulation indicated by archaeopyle and alignment of sutural ornamentation comprised of dense granules or verrucae. Sulcus sinuous, clearly demarcated.
Remarks. Both Wilson (1974) and Slimani (1994) note the significant thickening of the wall layers around the margins of the apical and antapical horns (up to 6 lm) but from their material, the outer wall was not observed to have assumed a spongeous, porous quality as is the case in some Hornby Island specimens (e.g. Plate 4, figures 5, 9). Occurrence. Canninginopsis maastrichtiensis is present from 40 to 372 m in the Northumberland Formation section exposed from the south-eastern coast northward to Collishaw Point.