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Dapcodinium holotabulatum
Dapcodinium holotabulatum Davies, 1983
Now Rosswangia. Originally Dapcodinium, subsequently (and now) Rosswangia.
Holotype: Davies, 1983, pl.1, figs.9-11
Locus typicus: Savik Formation, District of Franklin, Northwest Territories, Canada
Stratum typicum: Toarcian-Bathonian
Original diagnosis: Davies, 1983, p. 15
A species of Dapcodinium with coarsely granulate surface. Sutures represented by lines of granules or spines. Small apical horn sometimes present. Cingulum of variable width. Tabulation: 4", 4a, 7", 7c, 6""", 2p, 1"""", 3s, 1pv. Archeopyle: (4A)+41+7P?a.
Size: length - 45(48)55 µm; breadth - 37(43)55 µm.
Original description: Davies, 1983, p. 15
Proximate dinoflagellate cyst, almost spherical to slightly elongate. Short apical horn occasionally present; epicyst usually ruptured. Surface coarsely granulate. Sutures formed by densely aligned granules (less than 0.5 Ám) with rare spines occasionally coalescing to form low ridges, up to 1 Ám high.
Affinities:
Davies, 1983, p. 15: D. semitabulatum differs from D. holotabulatum by its incomplete tabulation, finer ornament and smaller size. D. ornatum differs in its smaller size and in that the sutures are marked by pandasutural zones.
Now Rosswangia. Originally Dapcodinium, subsequently (and now) Rosswangia.
Holotype: Davies, 1983, pl.1, figs.9-11
Locus typicus: Savik Formation, District of Franklin, Northwest Territories, Canada
Stratum typicum: Toarcian-Bathonian
Original diagnosis: Davies, 1983, p. 15
A species of Dapcodinium with coarsely granulate surface. Sutures represented by lines of granules or spines. Small apical horn sometimes present. Cingulum of variable width. Tabulation: 4", 4a, 7", 7c, 6""", 2p, 1"""", 3s, 1pv. Archeopyle: (4A)+41+7P?a.
Size: length - 45(48)55 µm; breadth - 37(43)55 µm.
Original description: Davies, 1983, p. 15
Proximate dinoflagellate cyst, almost spherical to slightly elongate. Short apical horn occasionally present; epicyst usually ruptured. Surface coarsely granulate. Sutures formed by densely aligned granules (less than 0.5 Ám) with rare spines occasionally coalescing to form low ridges, up to 1 Ám high.
Affinities:
Davies, 1983, p. 15: D. semitabulatum differs from D. holotabulatum by its incomplete tabulation, finer ornament and smaller size. D. ornatum differs in its smaller size and in that the sutures are marked by pandasutural zones.