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Meiourogonyaulax callomonii
Meiorogonyaulax callomonii Sarjeant, 1972
Originally (and now) Meiourogonyaulax, subsequently Lithodinia. This species is here retained in Meiourogonyaulax following the retention of the genus by Riding and Helby (2001d, p.81,83).
Holotype: Sarjeant, 1972, pl.6, fig.5, text-fig.6
Locus typicus: Jameson Land, Greenland
Stratum typicum: Late Bathonian-Early Callovian
Original diagnosis: Sarjeant, 1972, p.31-33
Cyst ovoidal, with apex lost in archaeopyle formation, The "decapitated" cyst is typically broader than it is long. Tabulation ?", 0a, 6", 6c, 6""", 1p, 1"""". Plate boundaries marked by crests of very irregular form and height; when most fully developed, they are perforate, with continuous crests, and assume the appearance of branching spines connected by trabeculae. Crests may be present on the margin of the apical archaeopyle. Cingulum relatively narrow, in the form of a laevo-rotatory spiral whose two ends differ in anteroposterior position by at least twice its breadth. The posterior intercalary plate is of moderate size; plate 1""" is quite sma!l. Both plates are distinctly elongate. The sulcus is broad and extends to the antapex; the antapical plate is of moderate size.
Dimensions: Holotype length 60 µm, breadth 67 µm. Range. length 50.5-70 µm (mean 59.25 µm), breadth 60-72 µm (mean 65.75 µm).
Originally (and now) Meiourogonyaulax, subsequently Lithodinia. This species is here retained in Meiourogonyaulax following the retention of the genus by Riding and Helby (2001d, p.81,83).
Holotype: Sarjeant, 1972, pl.6, fig.5, text-fig.6
Locus typicus: Jameson Land, Greenland
Stratum typicum: Late Bathonian-Early Callovian
Original diagnosis: Sarjeant, 1972, p.31-33
Cyst ovoidal, with apex lost in archaeopyle formation, The "decapitated" cyst is typically broader than it is long. Tabulation ?", 0a, 6", 6c, 6""", 1p, 1"""". Plate boundaries marked by crests of very irregular form and height; when most fully developed, they are perforate, with continuous crests, and assume the appearance of branching spines connected by trabeculae. Crests may be present on the margin of the apical archaeopyle. Cingulum relatively narrow, in the form of a laevo-rotatory spiral whose two ends differ in anteroposterior position by at least twice its breadth. The posterior intercalary plate is of moderate size; plate 1""" is quite sma!l. Both plates are distinctly elongate. The sulcus is broad and extends to the antapex; the antapical plate is of moderate size.
Dimensions: Holotype length 60 µm, breadth 67 µm. Range. length 50.5-70 µm (mean 59.25 µm), breadth 60-72 µm (mean 65.75 µm).