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Gillinia umbraculum
Holotype. Plate 2, figure 7; GSCA slide no. 50950-02 (¼GSCC slide no. P5148-38B); coordinates 6.6x92.5; EF line separating V54/2 and V55/1; Nunavut Palaeontology Collection no. NUPB 978; section 2, Twosnout Creek, Bylot Island. Bylot Island formation.
Etymology. The epithet is a noun in apposition and is from the Latin umbraculum meaning a small shady place, in reference to the structure of the pericyst.
Diagnosis. A species of Gillinia with an elongate central body and a paracingulum consisting of a partially detached membrane up to 2 mm high, which encircles the central body but is partly separated from it. Another unusual feature of the paracingulum is that it can project laterally to anteriorly; when the latter it forms a spectacular arch. The paraplate boundaries on the hypocyst can sometimes be marked by sutures, especially in the vicinity of the antapex. When present, these sutures are less than 1 mm high; however, the hypocyst can be without any signs of tabulation. The surface of the central body is reticulate. The archaeopyle is apical but does not show the usual outline of the anterior margins of the precingular paraplates, being generally rounded off.
Comments. The structure and detached nature of the paracingulum differentiate Gillinia umbraculum from other species of the genus.
Size. Holotype: central body length 9um, central body width 8um, process complex up to 15um. Range of three specimens: central body length 9–15um, central body breadth 8– 12um, paracingulum height is up to 34um.
Age. Late Santonian to early Maastrichtian.
Etymology. The epithet is a noun in apposition and is from the Latin umbraculum meaning a small shady place, in reference to the structure of the pericyst.
Diagnosis. A species of Gillinia with an elongate central body and a paracingulum consisting of a partially detached membrane up to 2 mm high, which encircles the central body but is partly separated from it. Another unusual feature of the paracingulum is that it can project laterally to anteriorly; when the latter it forms a spectacular arch. The paraplate boundaries on the hypocyst can sometimes be marked by sutures, especially in the vicinity of the antapex. When present, these sutures are less than 1 mm high; however, the hypocyst can be without any signs of tabulation. The surface of the central body is reticulate. The archaeopyle is apical but does not show the usual outline of the anterior margins of the precingular paraplates, being generally rounded off.
Comments. The structure and detached nature of the paracingulum differentiate Gillinia umbraculum from other species of the genus.
Size. Holotype: central body length 9um, central body width 8um, process complex up to 15um. Range of three specimens: central body length 9–15um, central body breadth 8– 12um, paracingulum height is up to 34um.
Age. Late Santonian to early Maastrichtian.