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Durotrigia asketa
Durotrigia asketa Bailey, 1990
Holotype: Bailey, 1990, pl.2, figs.1-3
Locus typicus: Fuller"s Earth, S England
Stratum typicum: Early-Middle Bathonian-earliest Callovian
Original diagnosis: Bailey, 1990, p. 140
Subspherical to rounded pentagonal proximate, acavate dinoflagellate cyst. Gonyaulacacean paratabulation (4", 2a, 6", 6c, 6""", 1p, 1"""") indicated by low, delicately-structured crests which are fenestrate and distally denticulate. The autophragm is also ornamented by intratabular tubercles and verrucae. A small apical horn is formed by anatomising fibrous elements. The archeopyle is variable precingular, type 1P-5P.
Description. The cyst is subspherical to rounded pentagonal in shape with a small apical horn and a broadly rounded hypocyst. Gonyaulacacean paratabulation is reflected by low, delicately structured crests which are fenestrate and distally denticulate. The autophragm is thin and more or less smooth with intratabular areas ornamented by irregularly scattered tubercles and verrucae. The apical horn is formed by anastomosing fibrous elements. The archeopyle is formed by the loss of between 1-5 precingular paraplates (type 1P-5P).
Comparison. Durotrigia asketa is distinguished from other species of the genus by possessing low parasutural crests which are fenestrate and distally denticulate.
Holotype: Bailey, 1990, pl.2, figs.1-3
Locus typicus: Fuller"s Earth, S England
Stratum typicum: Early-Middle Bathonian-earliest Callovian
Original diagnosis: Bailey, 1990, p. 140
Subspherical to rounded pentagonal proximate, acavate dinoflagellate cyst. Gonyaulacacean paratabulation (4", 2a, 6", 6c, 6""", 1p, 1"""") indicated by low, delicately-structured crests which are fenestrate and distally denticulate. The autophragm is also ornamented by intratabular tubercles and verrucae. A small apical horn is formed by anatomising fibrous elements. The archeopyle is variable precingular, type 1P-5P.
Description. The cyst is subspherical to rounded pentagonal in shape with a small apical horn and a broadly rounded hypocyst. Gonyaulacacean paratabulation is reflected by low, delicately structured crests which are fenestrate and distally denticulate. The autophragm is thin and more or less smooth with intratabular areas ornamented by irregularly scattered tubercles and verrucae. The apical horn is formed by anastomosing fibrous elements. The archeopyle is formed by the loss of between 1-5 precingular paraplates (type 1P-5P).
Comparison. Durotrigia asketa is distinguished from other species of the genus by possessing low parasutural crests which are fenestrate and distally denticulate.