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Australisphaera longicornis
Australisphaera longicornis, Batten and Lister, 1988; Emendation as Vesperopsis longicornis: Harding, 1990b, p. 21-22
Holotype: Batten and Lister, 1988, fig.1b-c
Locus typicus: Shepherd"s Chine Member of the Vectis Formation, Isle of Wight, England
Stratum typicum: Barremian
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Original description: [Batten and Lister, 1988, p. 340]:
Diagnosis:
Proximate ceratioid cyst, dorsoventrally flattened; maximum diameter 66(76)85x48(63)78 µm (10 specimens).
Apical horn prominent, somewhat elongate and distally rounded. Lateral horns developed as paracingular extensions bearing postparacingular, sharply tapering digitations c.12-25 µm (rarely > 40 µm) long. Usually two antapical horns present; left is strong, narrow, tapering and distally rounded; right is very reduced, sometimes a small triangular cone or low prominence, or absent altogether.
Cyst wall thin (1 µm or less), scabrate to microgranulate and without any indication of paratabulation.
Margin of archeopyle angular; six precingular paraplates and a deep parasulcal notch offset to left are indicated by splitting along accessory sutures. Archeopyle type (tA), operculum free but sometimes remaining attached after dehiscence.
Holotype: Batten and Lister, 1988, fig.1b-c
Locus typicus: Shepherd"s Chine Member of the Vectis Formation, Isle of Wight, England
Stratum typicum: Barremian
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: [Batten and Lister, 1988, p. 340]:
Diagnosis:
Proximate ceratioid cyst, dorsoventrally flattened; maximum diameter 66(76)85x48(63)78 µm (10 specimens).
Apical horn prominent, somewhat elongate and distally rounded. Lateral horns developed as paracingular extensions bearing postparacingular, sharply tapering digitations c.12-25 µm (rarely > 40 µm) long. Usually two antapical horns present; left is strong, narrow, tapering and distally rounded; right is very reduced, sometimes a small triangular cone or low prominence, or absent altogether.
Cyst wall thin (1 µm or less), scabrate to microgranulate and without any indication of paratabulation.
Margin of archeopyle angular; six precingular paraplates and a deep parasulcal notch offset to left are indicated by splitting along accessory sutures. Archeopyle type (tA), operculum free but sometimes remaining attached after dehiscence.