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Canningia macroreticulata
From Fensome et al., 2019:
Lebedeva in Ilyina et al., 1994, p.71, pl.30, figs.6–7; pl.31, figs.1–6; text-fig.10.
Holotype: Ilyina et al., 1994, pl.30, figs.6–7; Fensome et al., 2019a, figs.13I–J.
Age: late Coniacian.
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Original description: [Lebedeva in Ilyina et al., 1994] (translated from Russian with Google Translate):
Canningia macroreticulata Lebedeva sp. nov.
Pl. XXX, figs. 6, 7, pl. XXXI, figs. 1-6
The name comes from the Latin "macro" - large, "reticulatus" - mesh.
Holotype: Pl. XXX, figs. 6, 7, OIGGM SB RAS, preparation 315-1, Ust-Yenisei district, Yangoda river, outcrop 15, layer 2, upper Coniacian.
Description. Cysts are hollow-cavated, polygonal-rounded with two weakly developed antapical horns. The apical part was not observed. Autocyst is rounded, without antapical protrusions. Antapical horns are formed due to thickening of the ectocoel. The autophragm is thin (1-2 μm), smooth, with numerous randomly located pits and perforations along the edges of the plates (these elements are observed only on
SEM). The structures that enclose the ectophragm are thin (1 μm) septa, forming a coarse mesh, cellular pattern. The ectocoel is small (1-9 μm). The width of the ero increases in the region of the antapical horns (2-13 μm). The paratabulation is marked by an archeopyle, paracingulum, and sometimes thin penitabular sutures. Archeopyle tA, the main archeopyle suture is zigzag, the operculum is free. The paracingulum is a shallow groove, weakly divided into six parts. In a light microscope, the paracingulum is indicated by an indentation on the lateral sides. Parasulcus is not observed (Fig. 10).
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Comments Fensome et al., 2019a:
This species appears to be distinguished by its relatively coarse network of crests supporting a periphragm, the structure absent or reduced dorsoventrally. Paratabulation seems well developed, a feature especially clear on the SEM images (Ilyina et al. Citation1994).
Stratigraphical occurrence. Canningia macroreticulata was recorded from the upper Coniacian of Siberia.
Lebedeva in Ilyina et al., 1994, p.71, pl.30, figs.6–7; pl.31, figs.1–6; text-fig.10.
Holotype: Ilyina et al., 1994, pl.30, figs.6–7; Fensome et al., 2019a, figs.13I–J.
Age: late Coniacian.
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Original description: [Lebedeva in Ilyina et al., 1994] (translated from Russian with Google Translate):
Canningia macroreticulata Lebedeva sp. nov.
Pl. XXX, figs. 6, 7, pl. XXXI, figs. 1-6
The name comes from the Latin "macro" - large, "reticulatus" - mesh.
Holotype: Pl. XXX, figs. 6, 7, OIGGM SB RAS, preparation 315-1, Ust-Yenisei district, Yangoda river, outcrop 15, layer 2, upper Coniacian.
Description. Cysts are hollow-cavated, polygonal-rounded with two weakly developed antapical horns. The apical part was not observed. Autocyst is rounded, without antapical protrusions. Antapical horns are formed due to thickening of the ectocoel. The autophragm is thin (1-2 μm), smooth, with numerous randomly located pits and perforations along the edges of the plates (these elements are observed only on
SEM). The structures that enclose the ectophragm are thin (1 μm) septa, forming a coarse mesh, cellular pattern. The ectocoel is small (1-9 μm). The width of the ero increases in the region of the antapical horns (2-13 μm). The paratabulation is marked by an archeopyle, paracingulum, and sometimes thin penitabular sutures. Archeopyle tA, the main archeopyle suture is zigzag, the operculum is free. The paracingulum is a shallow groove, weakly divided into six parts. In a light microscope, the paracingulum is indicated by an indentation on the lateral sides. Parasulcus is not observed (Fig. 10).
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Comments Fensome et al., 2019a:
This species appears to be distinguished by its relatively coarse network of crests supporting a periphragm, the structure absent or reduced dorsoventrally. Paratabulation seems well developed, a feature especially clear on the SEM images (Ilyina et al. Citation1994).
Stratigraphical occurrence. Canningia macroreticulata was recorded from the upper Coniacian of Siberia.