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Dracodinium condylos
Dracodinium condylos (Willams and Downie, 1966) Costa and Downie, 1979
NOW Petalodinium. Originally Wetzeliella, subsequently Rhombodinium, thirdly Dracodinium, fourthly (and now) Petalodinium. Transferred to Petalodinium by Williams et al., 2015, p.308.
Holotype: Willams and Downie, 1966, pl.20, fig.1
Locus typicus: London Clay, Sheppey, England
Stratum typicum: Early Eocene
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G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Dracodinium condylos (Williams and Downie, 1966b) Costa and Downie, 1979, has very short processes or tubercules, that are 1-3 µm high. These are often arranged in simulate complexes. Low or absent apical horn, well-developed cingular horns. Size. Pericyst length 76-122 µm, width 86-115 µm. Endocyst length 56-85 µm, width 62-85 µm.
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Original diagnosis: Williams and Downie, 1966, p. 193: Wetzeliella (Wetzeliella) condylos
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 Ám thick, surface smooth or undulating.
Dimensions: holotype: Periphragm, length 122 Ám; breadth 112.5 Ám. Observed range: outer shell, length 76-122 Ám, breadth 86-115 Ám. Capsule, length 56-85 Ám; breadth 62-85 Ám.
Original description: Williams and Downie, 1966, p.193-194: Wetzeliella (Wetzeliella) condylos
The periphragm of W. condylos is up to 3 Ám 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 1-3Á. 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. Transferred to Petalodinium by Williams et al., 2015, p.308.
Holotype: Willams and Downie, 1966, pl.20, fig.1
Locus typicus: London Clay, Sheppey, England
Stratum typicum: Early Eocene
--------------------------------------------------
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Dracodinium condylos (Williams and Downie, 1966b) Costa and Downie, 1979, has very short processes or tubercules, that are 1-3 µm high. These are often arranged in simulate complexes. Low or absent apical horn, well-developed cingular horns. Size. Pericyst length 76-122 µm, width 86-115 µm. Endocyst length 56-85 µm, width 62-85 µm.
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Original diagnosis: Williams and Downie, 1966, p. 193: Wetzeliella (Wetzeliella) condylos
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 Ám thick, surface smooth or undulating.
Dimensions: holotype: Periphragm, length 122 Ám; breadth 112.5 Ám. Observed range: outer shell, length 76-122 Ám, breadth 86-115 Ám. Capsule, length 56-85 Ám; breadth 62-85 Ám.
Original description: Williams and Downie, 1966, p.193-194: Wetzeliella (Wetzeliella) condylos
The periphragm of W. condylos is up to 3 Ám 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 1-3Á. 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.