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Shublikodinium arcticum ssp. arcticum
Shublikodinium arcticum ssp. arcticum
Autonym, now redundant.
Now Rhaetogonyaulax arctica ssp. arctica. Originally Shublikodinium arcticum ssp. arcticum, subsequently (and now) Rhaetogonyaulax arctica ssp. arctica.
Holotype: Wiggins 1973, pl.1, fig.1-2
Paratypes: Wiggins, 1973
Locus typicus: Arctic Canada
Stratum typicum: Late Triassic
Original description: Wiggins 1973, p. 4: Shublikodinium arcticum
Diagnosis: Same as for the genus with the following additional description. The cyst wall of this species is characteristically covered with fine to extremely fine, low-relief grana or verrucae. The intensity of this ornamentation is variable. The sutural tabulation of the epitract and hypotract is best known in this species, because the weak surface ornamentation has a less disguising effect on seriation patterns. The sutural trace patterns are represented by thin, shallow grooves or thin, low ridges on the epitract and hypotract surfaces, and heavy ridges along portions of the transverse furrow and posterior sulcus margins. The ridges which surround the posterior sulcus appear to be offset or set slightly away from the sutural trace of the sulcus.
Autonym, now redundant.
Now Rhaetogonyaulax arctica ssp. arctica. Originally Shublikodinium arcticum ssp. arcticum, subsequently (and now) Rhaetogonyaulax arctica ssp. arctica.
Holotype: Wiggins 1973, pl.1, fig.1-2
Paratypes: Wiggins, 1973
Locus typicus: Arctic Canada
Stratum typicum: Late Triassic
Original description: Wiggins 1973, p. 4: Shublikodinium arcticum
Diagnosis: Same as for the genus with the following additional description. The cyst wall of this species is characteristically covered with fine to extremely fine, low-relief grana or verrucae. The intensity of this ornamentation is variable. The sutural tabulation of the epitract and hypotract is best known in this species, because the weak surface ornamentation has a less disguising effect on seriation patterns. The sutural trace patterns are represented by thin, shallow grooves or thin, low ridges on the epitract and hypotract surfaces, and heavy ridges along portions of the transverse furrow and posterior sulcus margins. The ridges which surround the posterior sulcus appear to be offset or set slightly away from the sutural trace of the sulcus.