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Ceratiopsis subquadra
Ceratiopsis subquadra, (Corradini, 1973), Lentin and Williams, 1977
Combination illegitimate since the generic name Ceratiopsis is illegitimate.
Now Cerodinium. OriginallyDeflandrea, subsequently Senegalinium?, thirdly Ceratiopsis (combination illegitimate), fourthly (and now) Cerodinium.
Stover and Evitt, 1978, retained this species in Deflandrea Eisenack, 1938. Lentin and Williams, 1981, retained it in Ceratiopsis.
Holotype: Corradini, 1973, pl.28, fig.1
Locus typicus: Viano, Reggio Emilia, Italy
Stratum typicum: Senonian
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Original description as Deflandrea subquadra: [Corradini, 1973, p. 176]:
Diagnosis:
Dinoflagellate cyst having a more or less triangular epitract and a wide rectangular hypotract. Large apical horn with broad base; antapical horns relatively little developed. Inner capsule subcircular to subquadrate in outline, normally in contact with the outer wall.
Archeopyle intercalary.
Description:
The test is flattened dorso-ventrally and is composed of a thick smooth endophragm and of an irregularly punctate or vermiculate, thin periphragm. The inner body possesses a slightly thick wall while the outer membrane is thinner. The sides of the triangular epitract are sometimes partially convex but normally rectilinear.
Apical horn with broad base tapering to the blunt apex with the same inclination as the sides of the epitract. The hypotract is less wide than the cingulum and almost quadrangular in shape. The antapical horns, fairly well developed, are distally blunted and well separated, their axes being straight diverging. Cingulum and sulcus well developed, but the latter only on the hypotract.
Large intercalary archeopyle.
Dimensions:
Holotype: diameter of the inner capsule 60x65 µm, width of the cyst 74 µm, overall length 143 µm.
Range: diameter of the inner capsule 55-60x60-65 µm, width of the cyst 72-75 µm, overall length 115-143 µm.
Combination illegitimate since the generic name Ceratiopsis is illegitimate.
Now Cerodinium. OriginallyDeflandrea, subsequently Senegalinium?, thirdly Ceratiopsis (combination illegitimate), fourthly (and now) Cerodinium.
Stover and Evitt, 1978, retained this species in Deflandrea Eisenack, 1938. Lentin and Williams, 1981, retained it in Ceratiopsis.
Holotype: Corradini, 1973, pl.28, fig.1
Locus typicus: Viano, Reggio Emilia, Italy
Stratum typicum: Senonian
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Original description as Deflandrea subquadra: [Corradini, 1973, p. 176]:
Diagnosis:
Dinoflagellate cyst having a more or less triangular epitract and a wide rectangular hypotract. Large apical horn with broad base; antapical horns relatively little developed. Inner capsule subcircular to subquadrate in outline, normally in contact with the outer wall.
Archeopyle intercalary.
Description:
The test is flattened dorso-ventrally and is composed of a thick smooth endophragm and of an irregularly punctate or vermiculate, thin periphragm. The inner body possesses a slightly thick wall while the outer membrane is thinner. The sides of the triangular epitract are sometimes partially convex but normally rectilinear.
Apical horn with broad base tapering to the blunt apex with the same inclination as the sides of the epitract. The hypotract is less wide than the cingulum and almost quadrangular in shape. The antapical horns, fairly well developed, are distally blunted and well separated, their axes being straight diverging. Cingulum and sulcus well developed, but the latter only on the hypotract.
Large intercalary archeopyle.
Dimensions:
Holotype: diameter of the inner capsule 60x65 µm, width of the cyst 74 µm, overall length 143 µm.
Range: diameter of the inner capsule 55-60x60-65 µm, width of the cyst 72-75 µm, overall length 115-143 µm.