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Deflandrea striata
Deflandrea striata Drugg, 1967
Now Cerodinium. Originally Deflandrea, subsequently (and now) Cerodinium. See also Ceratiopsis (combination illegitimate).
Holotype: Drugg, 1967, pl.2, fig.13
Locus typicus: Escapardo Canyon, California
Stratum typicum: Early Paleocene
Original diagnosis: Drugg, 1967, p.18
Apical horn long, tapered, bluntly pointed. Antapical horns broad, tapered, pointed, connected to each other below the cyst by a web. Large internal cyst always present, circular to ellipsoidal in outline. Cyst wall single layered, unornamented, about 1Á thick. Test wall thin, ornamented with rows of grana paralleling the long axis of the test. These grana sometimes coalesce to form low ridges. Parallel wrinkles often present, grana, ridges, and wrinkles together presenting a markedly striate appearance. Girdle circular, shallow, about 8Á wide, delineated by two parallel rows of grana (beading) or by low, denticulate walls. The center line of the girdle sometimes marked by a single row of grana, but the girdle is more often ornamented only by close-set vertical wrinkles. Longitudinal furrow broad, usually indistinct. Opening in cyst always present, large, somewhat angular but in gross outline semicircular, about 35 Ám wide and 22 Ám high. It is dorsally located but sometimes extends onto the ventral side of the cyst as though the top were sliced off with a cut inclined dorsally. The archeopyle in the test wall is less distinct but coincides with the cyst opening. The opercula of both openings break free first on the lower border. Range of dimensions, 79-97 Ám broad, 138-168 Ám long.
Affinities:
Drugg, 1967, p.18: This species differs from Deflandrea delineata Cookson and Eisenack 1965 in that it is slightly smaller, lacks tabulation, and is more uniformly striate. In addition the girdle is bordered by beaded or denticulate edges, a feature lacking on D. delineata.
Now Cerodinium. Originally Deflandrea, subsequently (and now) Cerodinium. See also Ceratiopsis (combination illegitimate).
Holotype: Drugg, 1967, pl.2, fig.13
Locus typicus: Escapardo Canyon, California
Stratum typicum: Early Paleocene
Original diagnosis: Drugg, 1967, p.18
Apical horn long, tapered, bluntly pointed. Antapical horns broad, tapered, pointed, connected to each other below the cyst by a web. Large internal cyst always present, circular to ellipsoidal in outline. Cyst wall single layered, unornamented, about 1Á thick. Test wall thin, ornamented with rows of grana paralleling the long axis of the test. These grana sometimes coalesce to form low ridges. Parallel wrinkles often present, grana, ridges, and wrinkles together presenting a markedly striate appearance. Girdle circular, shallow, about 8Á wide, delineated by two parallel rows of grana (beading) or by low, denticulate walls. The center line of the girdle sometimes marked by a single row of grana, but the girdle is more often ornamented only by close-set vertical wrinkles. Longitudinal furrow broad, usually indistinct. Opening in cyst always present, large, somewhat angular but in gross outline semicircular, about 35 Ám wide and 22 Ám high. It is dorsally located but sometimes extends onto the ventral side of the cyst as though the top were sliced off with a cut inclined dorsally. The archeopyle in the test wall is less distinct but coincides with the cyst opening. The opercula of both openings break free first on the lower border. Range of dimensions, 79-97 Ám broad, 138-168 Ám long.
Affinities:
Drugg, 1967, p.18: This species differs from Deflandrea delineata Cookson and Eisenack 1965 in that it is slightly smaller, lacks tabulation, and is more uniformly striate. In addition the girdle is bordered by beaded or denticulate edges, a feature lacking on D. delineata.