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Canningia filosa
From Fensome et al., 2019:
Canningia filosa (Wilson, 1988, p.14–15, pl.2, figs.8a–b,9; pl.3, figs.2a–b) Fensome et al., 2019a, p.23.
Holotype: Wilson, 1988, pl.2, figs.8a–b; Fensome et al., 1996, figs.1–2 — p.2125; Fensome et al., 2019a, figs.12M–N.
Originally Cassidium, subsequently (and now) Canningia?.
Questionable assignment: Fensome et al. (2019a, p.23).
Age: Paleocene.
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Original description: [Wilson, 1988, p.14-15]:
Description:
Cyst spherical to subspherical, intermediate to large, with relatively thick reticulate or rugulate autophragm, and bearing short irregular filamentous intratabular processes which are usually solitary but may occasionally be joined distally.
Processes comprise widely separated filaments which arise directly from autophragm reticulum.
Paratabulation apparently gonyaulacacean, poorly defined by narrow parasutural areas devoid of ornament.
Archeopyle apical, Type tA; principal archeopyle suture zig-zag; operculum free.
Paracingulum poorly defined on dorsal surface, not usually seen on ventral surface.
Dimensions:
Holotype: overall length (including operculum) 103 µm, breadth 85 µm, length excluding processes 76 µm, breadth 68 µm, length of processes up to 15 µm.
Range: overall breadth 76(86)98 µm, breadth excluding processes 68(75)81 µm. Maximum length of processes 11-15 µm (n = 10).
Affinities:
The species differs from the type in having irregular filamentous processes which C. fragile lacks.
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Comments Fensome et al., 2019a:
Wilson (Citation1988, p. 14–15) described this species as having a ‘relatively thick reticulate or rugulate autophragm [i.e. endophragm in our terminology], and bearing short irregular filamentous intratabular processes which are usually solitary but may occasionally be joined distally’. This description is difficult to relate to the original illustrations, which appear to show a ragged membranous development arising from the reticulate autophragm, apparently connected by a discontinuous periphragm. Given the apparent presence of a periphragm, we questionably transfer this species to Canningia.
Stratigraphical occurrence. Canningia? filosa was originally described from the Palaeocene of New Zealand.
Canningia filosa (Wilson, 1988, p.14–15, pl.2, figs.8a–b,9; pl.3, figs.2a–b) Fensome et al., 2019a, p.23.
Holotype: Wilson, 1988, pl.2, figs.8a–b; Fensome et al., 1996, figs.1–2 — p.2125; Fensome et al., 2019a, figs.12M–N.
Originally Cassidium, subsequently (and now) Canningia?.
Questionable assignment: Fensome et al. (2019a, p.23).
Age: Paleocene.
---------------------------------------------------------------------------------------------------
Original description: [Wilson, 1988, p.14-15]:
Description:
Cyst spherical to subspherical, intermediate to large, with relatively thick reticulate or rugulate autophragm, and bearing short irregular filamentous intratabular processes which are usually solitary but may occasionally be joined distally.
Processes comprise widely separated filaments which arise directly from autophragm reticulum.
Paratabulation apparently gonyaulacacean, poorly defined by narrow parasutural areas devoid of ornament.
Archeopyle apical, Type tA; principal archeopyle suture zig-zag; operculum free.
Paracingulum poorly defined on dorsal surface, not usually seen on ventral surface.
Dimensions:
Holotype: overall length (including operculum) 103 µm, breadth 85 µm, length excluding processes 76 µm, breadth 68 µm, length of processes up to 15 µm.
Range: overall breadth 76(86)98 µm, breadth excluding processes 68(75)81 µm. Maximum length of processes 11-15 µm (n = 10).
Affinities:
The species differs from the type in having irregular filamentous processes which C. fragile lacks.
---------------------------------------------------------------------------------------------------
Comments Fensome et al., 2019a:
Wilson (Citation1988, p. 14–15) described this species as having a ‘relatively thick reticulate or rugulate autophragm [i.e. endophragm in our terminology], and bearing short irregular filamentous intratabular processes which are usually solitary but may occasionally be joined distally’. This description is difficult to relate to the original illustrations, which appear to show a ragged membranous development arising from the reticulate autophragm, apparently connected by a discontinuous periphragm. Given the apparent presence of a periphragm, we questionably transfer this species to Canningia.
Stratigraphical occurrence. Canningia? filosa was originally described from the Palaeocene of New Zealand.