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Wetzeliella (Apectodinium) augusta
Wetzeliella (Apectodinium) augusta Harland, 1979
Originally Wetzeliella subgenus Apectodinium, subsequently (and now) Apectodinium.
Holotype: Harland, 1979, pl.2, fig.13
Locus typicus: Northwest Europe
Stratum typicum: Late Paleocene
Original diagnosis: Harland, 1979, p. 63
Large, pentagonal cavate cysts, with pericoel mainly developed beneath the horns. With or without an apical horn but characterised by long, up to three-quarters the diameter of the cyst, lateral horns and well developed asymmetrical antapical horns. Processes hollow, long, flexuous, simple, evexate or aculeate, randomly developed. No tabulation discernible. archaeopyle I2a/I3a, ?reduced.
Original description: Harland, 1979, p.63
Wall layers thin, the endophragm often shows crumpling, closely adpressed but not actually adjoining; wall surfaces smooth to rough, possibly microgranulate. The endophragm separates from the periphragm at the horns but may also swell slightly into the horn pericoels. Cyst shape markedly pentagonal although some specimens exhibit a more rounded ambitus. Horn characteristic, although the development the apical horn is variable from being prominent to absent. The horns often show some branching and the antapical horns are asymmetrically developed, the left one being the better developed. All the horns bear processes. Press development shows a differentiation between shorter peripheral types and those towards the median-line of the cyst; processes are long between 1/15 and 1/4 cyst diameter, tubular, made up of periphragm, slender, tapering, sinuous, closed distally and bear, sometimes long, spines. The processes are apparently randomly distributed apart from sutural ones in the cingular area, where some branched complex processes my occur.
Dimensions: Length: 60.0-75.0µm; Breadth: 63.75-85.0µm.
Variation: Intraspecific variation appears restricted to one of size and shape and to the development of the apical horn.
Originally Wetzeliella subgenus Apectodinium, subsequently (and now) Apectodinium.
Holotype: Harland, 1979, pl.2, fig.13
Locus typicus: Northwest Europe
Stratum typicum: Late Paleocene
Original diagnosis: Harland, 1979, p. 63
Large, pentagonal cavate cysts, with pericoel mainly developed beneath the horns. With or without an apical horn but characterised by long, up to three-quarters the diameter of the cyst, lateral horns and well developed asymmetrical antapical horns. Processes hollow, long, flexuous, simple, evexate or aculeate, randomly developed. No tabulation discernible. archaeopyle I2a/I3a, ?reduced.
Original description: Harland, 1979, p.63
Wall layers thin, the endophragm often shows crumpling, closely adpressed but not actually adjoining; wall surfaces smooth to rough, possibly microgranulate. The endophragm separates from the periphragm at the horns but may also swell slightly into the horn pericoels. Cyst shape markedly pentagonal although some specimens exhibit a more rounded ambitus. Horn characteristic, although the development the apical horn is variable from being prominent to absent. The horns often show some branching and the antapical horns are asymmetrically developed, the left one being the better developed. All the horns bear processes. Press development shows a differentiation between shorter peripheral types and those towards the median-line of the cyst; processes are long between 1/15 and 1/4 cyst diameter, tubular, made up of periphragm, slender, tapering, sinuous, closed distally and bear, sometimes long, spines. The processes are apparently randomly distributed apart from sutural ones in the cingular area, where some branched complex processes my occur.
Dimensions: Length: 60.0-75.0µm; Breadth: 63.75-85.0µm.
Variation: Intraspecific variation appears restricted to one of size and shape and to the development of the apical horn.