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Dinogymnium microgranulosum
Dinogymnium microgranulosum Clarke and Verdier, 1967
Tax. jr. synonym of Dinogymnium acuminatum Evitt et al., 1967, according to Lentin and Vozzhennikova, 1990.
Holotype: Clarke and Verdeir, 1967, pl.5, fig.9
Locus typicus: Culver Cliff, Isle of Wight, England
Stratum typicum: Santonian
Original diagnosis: Clarke and Verdier, 1967, p.34
A species of Dinogymnium having the epitheca longer than the hypotheca. Ribs sculptured with scabrae.
Original description: Clake and Verdier, 1967, p.34-35
Overall outline elongate oval. Epitheca longer and more pointed than hypotheca. Apical archaeopyle present (pl. 5, fig. 10). Girdle present, distinct, showing only slight interruption ventrally. Longitudinal furrow present on both epi- and hypotheca. Sculpture of numerous broad ridges separated by narrow striae. Scabrae are present, densely packed, on the ridges but appear to be generally absent from the striae and the girdle area. The ridges are more or less equal on each side of the hypotheca but appear to be more numerous dorsally than ventrally on the epitheca.
Measurements:HolotypeRange
Length84 Ám51-85 Ám
Breadth54 Ám29-54 Ám
Width of girdle (max.)13 Ám5-13 Ám
Affinities:
Clarke and Verdeir, 1967, p.35: Dinogymnium microgranulosum differs from D. albertii, D. digitum (Defl.) E., C., and V. and D. westralium (Cook. and Eis.) E., C. and V. in the presence of a micropositive sculpture and from D. denticulatum (Alberti) E., C., and V. in the absence of undulating ribs. Although no micropositive sculpture is mentioned in the original description of D. cretaceum (Defl.) E., C., and V., an examination of the holotype reveals the presence of this type of sculpture. However, D. cretaceum differs from D. microgranulosum in having the sculpture completely covering the body and its overall size is much smaller. D. microgranulosum differs from D. nelsonense (Cookson) E., C. and V. in the stronger ribs and more pronounced girdle.
Tax. jr. synonym of Dinogymnium acuminatum Evitt et al., 1967, according to Lentin and Vozzhennikova, 1990.
Holotype: Clarke and Verdeir, 1967, pl.5, fig.9
Locus typicus: Culver Cliff, Isle of Wight, England
Stratum typicum: Santonian
Original diagnosis: Clarke and Verdier, 1967, p.34
A species of Dinogymnium having the epitheca longer than the hypotheca. Ribs sculptured with scabrae.
Original description: Clake and Verdier, 1967, p.34-35
Overall outline elongate oval. Epitheca longer and more pointed than hypotheca. Apical archaeopyle present (pl. 5, fig. 10). Girdle present, distinct, showing only slight interruption ventrally. Longitudinal furrow present on both epi- and hypotheca. Sculpture of numerous broad ridges separated by narrow striae. Scabrae are present, densely packed, on the ridges but appear to be generally absent from the striae and the girdle area. The ridges are more or less equal on each side of the hypotheca but appear to be more numerous dorsally than ventrally on the epitheca.
Measurements:HolotypeRange
Length84 Ám51-85 Ám
Breadth54 Ám29-54 Ám
Width of girdle (max.)13 Ám5-13 Ám
Affinities:
Clarke and Verdeir, 1967, p.35: Dinogymnium microgranulosum differs from D. albertii, D. digitum (Defl.) E., C., and V. and D. westralium (Cook. and Eis.) E., C. and V. in the presence of a micropositive sculpture and from D. denticulatum (Alberti) E., C., and V. in the absence of undulating ribs. Although no micropositive sculpture is mentioned in the original description of D. cretaceum (Defl.) E., C., and V., an examination of the holotype reveals the presence of this type of sculpture. However, D. cretaceum differs from D. microgranulosum in having the sculpture completely covering the body and its overall size is much smaller. D. microgranulosum differs from D. nelsonense (Cookson) E., C. and V. in the stronger ribs and more pronounced girdle.