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Cyclonephelium intonsum
Cyclonephelium intonsum Duxbury, 1983
Holotype: Duxbury, 1983, pl.2, fig.7, text-figs.13,14A
Locus typicus: Atherfield section, Isle of Wight, England
Stratum typicum: Late Aptian-Early Albian
Original diagnosis: Duxbury, 1983, p. 33-34
A species of Cyclonephelium whose outline is roughly circular. It has a low, distally rounded and closed apical horn and a left antapical prominence may be present. A dense, low ornament covers the ventral periphery and takes the form of irregular granules or short coni which may coalesce laterally to produce a crude microreticulum. Some interruption of ornament may be observed laterally in a position corresponding to the paracingulum. The archeopyle is apical with the operculum usually completely detached. Paratabulation is lacking, but parasutural splits around the archeopyle margin indicate the presence of six precingular paraplates. The parasulcus is offset to the left.
Observed Dimensions: Holotype 75x81 µm. Complete specimens 84(81)78x75(73)70 µm. Operculum detached 87(70)58x87(75)61 µm.
Affinities:
Duxbury, 1983, p. 34: This species differs from all others of the genus in the nature and distribution of the peripheral ornament.
Holotype: Duxbury, 1983, pl.2, fig.7, text-figs.13,14A
Locus typicus: Atherfield section, Isle of Wight, England
Stratum typicum: Late Aptian-Early Albian
Original diagnosis: Duxbury, 1983, p. 33-34
A species of Cyclonephelium whose outline is roughly circular. It has a low, distally rounded and closed apical horn and a left antapical prominence may be present. A dense, low ornament covers the ventral periphery and takes the form of irregular granules or short coni which may coalesce laterally to produce a crude microreticulum. Some interruption of ornament may be observed laterally in a position corresponding to the paracingulum. The archeopyle is apical with the operculum usually completely detached. Paratabulation is lacking, but parasutural splits around the archeopyle margin indicate the presence of six precingular paraplates. The parasulcus is offset to the left.
Observed Dimensions: Holotype 75x81 µm. Complete specimens 84(81)78x75(73)70 µm. Operculum detached 87(70)58x87(75)61 µm.
Affinities:
Duxbury, 1983, p. 34: This species differs from all others of the genus in the nature and distribution of the peripheral ornament.