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Wetzeliella condylos
Wetzeliella condylos Willams and Downie, 1966
NOW Petalodinium. Originally Wetzeliella, subsequently Rhombodinium, thirdly Dracodinium, fourthly (and now) Petalodinium.
Holotype: Willams and Downie, 1966, pl.20, fig.1
Locus typicus: London Clay, Sheppey, England
Stratum typicum: Early Eocene
Original diagnosis: Williams and Downie, 1966, p. 193
Flattened outer shell with well formed lateral horns, low or absent apical horns and two antapical horns, the right one always longer. Apical area tending to be curved. Periphragm ornamented with a number of extremely short, blunt intratabular processes some arranged in simulate complexes reflecting a tabulation of 4", 3a, 7", xc, 5""", 2"""", 3s, others occurring within complexes. Hypotract of periphagm of greater length than epitract. Capsule ovoidal to sub-circular in outline ellipsoidal in cross section. Endophragm up to 3.5 µm thick, surface smooth or undulating.
Dimensions: holotype: Periphragm, length 122 µm; breadth 112.5 µm. Observed
range: outer shell, length 76-122 µm, breadth 86-115 µm. Capsule, length 56-85 µm; breadth 62-85 µm.
Original description: Williams and Downie, 1966, p.193-194
The periphragm of W. condylos is up to 3 µm thick and forms the extremely small processes. These open to the pericoel and are cylindrical in cross section and distally closed with a blunt ending. The height of the processes is of the order of 1-3 µm. The characteristic generic tabulation can be determined from the regular disposition of the processes in simulate complexes on the pericoel. Auxiliary irregularly arranged processes are also common. The lateral horns of the periphragm are always prominently developed; the apical horn, if present, is at the most a small protuberance. The capsule occasionally abutts on to the inner surface of the periphragm.
NOW Petalodinium. Originally Wetzeliella, subsequently Rhombodinium, thirdly Dracodinium, fourthly (and now) Petalodinium.
Holotype: Willams and Downie, 1966, pl.20, fig.1
Locus typicus: London Clay, Sheppey, England
Stratum typicum: Early Eocene
Original diagnosis: Williams and Downie, 1966, p. 193
Flattened outer shell with well formed lateral horns, low or absent apical horns and two antapical horns, the right one always longer. Apical area tending to be curved. Periphragm ornamented with a number of extremely short, blunt intratabular processes some arranged in simulate complexes reflecting a tabulation of 4", 3a, 7", xc, 5""", 2"""", 3s, others occurring within complexes. Hypotract of periphagm of greater length than epitract. Capsule ovoidal to sub-circular in outline ellipsoidal in cross section. Endophragm up to 3.5 µm thick, surface smooth or undulating.
Dimensions: holotype: Periphragm, length 122 µm; breadth 112.5 µm. Observed
range: outer shell, length 76-122 µm, breadth 86-115 µm. Capsule, length 56-85 µm; breadth 62-85 µm.
Original description: Williams and Downie, 1966, p.193-194
The periphragm of W. condylos is up to 3 µm thick and forms the extremely small processes. These open to the pericoel and are cylindrical in cross section and distally closed with a blunt ending. The height of the processes is of the order of 1-3 µm. The characteristic generic tabulation can be determined from the regular disposition of the processes in simulate complexes on the pericoel. Auxiliary irregularly arranged processes are also common. The lateral horns of the periphragm are always prominently developed; the apical horn, if present, is at the most a small protuberance. The capsule occasionally abutts on to the inner surface of the periphragm.