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Aldorfia sp. a of davey, 1982
Aldorfia sp. A of Davey, Davey, 1982, pl.7, figs.13-15
Occurrence: Lincolnshire, England
Age: Early Portlandian
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Original description: [Davey, 1982, p. 25]:
Description:
This is a moderately large, subsphaerical to rhomboidal form having a hollow, conical apical horn formed only of periphragm. The paracingulum may also be marked by a slight extension of the periphragm; the parasulcus is defined by a weak depression. The endophragm and periphragm are separated by a distinct pericoel which is traversed by isolated collumnae which sometimes coalesce to form short muri.
A precingular archaeopyle (3"") is typically developed.
Occurrence: Lincolnshire, England
Age: Early Portlandian
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Original description: [Davey, 1982, p. 25]:
Description:
This is a moderately large, subsphaerical to rhomboidal form having a hollow, conical apical horn formed only of periphragm. The paracingulum may also be marked by a slight extension of the periphragm; the parasulcus is defined by a weak depression. The endophragm and periphragm are separated by a distinct pericoel which is traversed by isolated collumnae which sometimes coalesce to form short muri.
A precingular archaeopyle (3"") is typically developed.