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Microdinium scutella
1986 Microdinium sp. A of Ioannides, p. 29, pl. 15, figs. 14, 15, 17.
Holotype. Plate 3, figure 10; GSCA slide no. P50915-07 (¼GSCC slide no. P5148–3D); coordinates 15.1�88.8; EF J58 circle intersected by J58/4; Nunavut Palaeontology Collection no. NUPB 1001; south coast, Bylot Island. Bylot Island formation.
Etymology. The epithet, a noun in apposition, is from the Latin scutella meaning little tray or platter, in reference to the paraplates in which the autocyst is divided.
Diagnosis. Autocyst small, circular to elongate, with more- or-less complete paratabulation defined by septa up to 3mm high. Precingular paraplates often separated laterally. Paracingulum broad, circular, showing no or minimum posterior displacement. The archaeopyle is apparently apical but may include some anterior intercalary paraplates. Autocyst surface verrucate to rugulate, occasionally granulate. The hypocyst tends to be longer than the epicyst. What appears to be the middorsal hypocystal paraplate (presumably 3000) is concave on its lateral margins.
Comments. Microdinium sp. A of Ioannides (1986) resembles Microdinium scutella in the ornamentation of the autocyst, which can be densely punctate, granular or microrugulate. Many specimens of Microdinium scutella tend to be larger than Microdinium sp. A of Ioannides (1986). As in Microdinium sinuatus sp. nov. the precingular paraplates in Microdinium scutella can be separated laterally by accessory archaeopyle sutures.
Size. Holotype: central body length 36um, central body width 36um. Range of six specimens: central body length, with operculum missing, 11–36um, central body width 11– 36um.
Age. Late Coniacian to middle Campanian.
Holotype. Plate 3, figure 10; GSCA slide no. P50915-07 (¼GSCC slide no. P5148–3D); coordinates 15.1�88.8; EF J58 circle intersected by J58/4; Nunavut Palaeontology Collection no. NUPB 1001; south coast, Bylot Island. Bylot Island formation.
Etymology. The epithet, a noun in apposition, is from the Latin scutella meaning little tray or platter, in reference to the paraplates in which the autocyst is divided.
Diagnosis. Autocyst small, circular to elongate, with more- or-less complete paratabulation defined by septa up to 3mm high. Precingular paraplates often separated laterally. Paracingulum broad, circular, showing no or minimum posterior displacement. The archaeopyle is apparently apical but may include some anterior intercalary paraplates. Autocyst surface verrucate to rugulate, occasionally granulate. The hypocyst tends to be longer than the epicyst. What appears to be the middorsal hypocystal paraplate (presumably 3000) is concave on its lateral margins.
Comments. Microdinium sp. A of Ioannides (1986) resembles Microdinium scutella in the ornamentation of the autocyst, which can be densely punctate, granular or microrugulate. Many specimens of Microdinium scutella tend to be larger than Microdinium sp. A of Ioannides (1986). As in Microdinium sinuatus sp. nov. the precingular paraplates in Microdinium scutella can be separated laterally by accessory archaeopyle sutures.
Size. Holotype: central body length 36um, central body width 36um. Range of six specimens: central body length, with operculum missing, 11–36um, central body width 11– 36um.
Age. Late Coniacian to middle Campanian.