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Pyxidiella tumida
From Fensome et al., 2019:
Pyxidiella tumida Stover and Helby, 1987d, p.271, figs.9A–U. Holotype: Stover and Helby, 1987d, figs.9A–E; Fensome et al., 1996, figs.1–5 — p.2413. Age: Barremian–early Aptian.
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Locus typicus: Abrolhos Subbasin, SW Australia
Stratum typicum: Barremian-Early Aptian
Original description: Stover and Helby, 1987, p.271
Cysts proximate, elongate ellipsoidal; composed of a thin (1 µm or less), continuous, apparently untextured layer bearing verrucae, and occasionally, granules. Verrucae circular, elliptical, polygonal and irregularly shaped in outline, closely spaced, 2.5-4.5 µm in diameter or greatest width, 2 to slightly greater than 3 µm in height, and distally convex to nearly flat. Adjacent verrucae may coalesce to form discontinuous ridges up to 8 µm in length. Granules smaller, much less numerous than the verrucae, and may be absent on some specimens. Archeopyle intercalary, type I (2a hexa-style); operculum free. Indications of paratabulation, other than the archeopyle, lacking. Specimens 41 (45) 49 µm long, 18 (23) 27 µm wide; 17 specimens measured.
Affinities:
Stover and Helby, 1987, p.271: Pyxidiella tumida differs from P. pandora Cookson and Eisenack 1958 in being verrucate and specimens of P. tumida tend to be narrower than those of P. pandora.
Pyxidiella tumida Stover and Helby, 1987d, p.271, figs.9A–U. Holotype: Stover and Helby, 1987d, figs.9A–E; Fensome et al., 1996, figs.1–5 — p.2413. Age: Barremian–early Aptian.
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Locus typicus: Abrolhos Subbasin, SW Australia
Stratum typicum: Barremian-Early Aptian
Original description: Stover and Helby, 1987, p.271
Cysts proximate, elongate ellipsoidal; composed of a thin (1 µm or less), continuous, apparently untextured layer bearing verrucae, and occasionally, granules. Verrucae circular, elliptical, polygonal and irregularly shaped in outline, closely spaced, 2.5-4.5 µm in diameter or greatest width, 2 to slightly greater than 3 µm in height, and distally convex to nearly flat. Adjacent verrucae may coalesce to form discontinuous ridges up to 8 µm in length. Granules smaller, much less numerous than the verrucae, and may be absent on some specimens. Archeopyle intercalary, type I (2a hexa-style); operculum free. Indications of paratabulation, other than the archeopyle, lacking. Specimens 41 (45) 49 µm long, 18 (23) 27 µm wide; 17 specimens measured.
Affinities:
Stover and Helby, 1987, p.271: Pyxidiella tumida differs from P. pandora Cookson and Eisenack 1958 in being verrucate and specimens of P. tumida tend to be narrower than those of P. pandora.