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Cornudinium bicuneatum
From Fensome et al., 2019:
Cornudinium bicuneatum (Deflandre, 1939a, p.180, pl.8, fig.7 ex Sarjeant, 1967b, p.248) Courtinat, 1989, p.220. Holotype: Deflandre, 1939a, pl.8, fig.7. Originally Palaeoperidinium, subsequently Scriniodinium, thirdly Glossodinium, fourthly Dinopterygium, fifthly (and now) Cornudinium. The name Palaeoperidinium bicuneatum was not validly published in Deflandre (1939a) since the generic name Palaeoperidinium was not validly published until 1967. Williams et al. (1998, p.141) accepted Sarjeant's (1967b) indirect reference to Deflandre (1939a), in which the name Palaeoperidinium bicuneatum was first proposed, as indication of a type (ICN Article 40.3). Age: Oxfordian.
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Original description: [Deflandre, 1939a] (translated from French):
Palæoperidinium bicuneatum n. sp.
Plate VIII, Fig. 7.
Holotype: AM 32.
In this species, the epitheca and hypotheca are conical and approximately equal. They are separated by a narrow transverse groove. The epitheca ends in a short, truncated tube, while the hypotheca has a rounded, very slightly projecting tip. The thin membrane bears various folds, the interpretation of which is not possible. It was clearly stained with hematoxylin. The cell, in its rather strongly flattened state, measures 100 μm long and 65 μm wide. The rather poor state of preservation of the only specimen currently known to me does not allow for a truly objective description: it is only because it belongs to a morphological type quite different from all the others that I have included it. It seems rather difficult to see a Gonyaulax or a Peridinium here; perhaps one could instead suggest a relationship with an Amphidoma, such as Amphidoma acuminata Stein.
Cornudinium bicuneatum (Deflandre, 1939a, p.180, pl.8, fig.7 ex Sarjeant, 1967b, p.248) Courtinat, 1989, p.220. Holotype: Deflandre, 1939a, pl.8, fig.7. Originally Palaeoperidinium, subsequently Scriniodinium, thirdly Glossodinium, fourthly Dinopterygium, fifthly (and now) Cornudinium. The name Palaeoperidinium bicuneatum was not validly published in Deflandre (1939a) since the generic name Palaeoperidinium was not validly published until 1967. Williams et al. (1998, p.141) accepted Sarjeant's (1967b) indirect reference to Deflandre (1939a), in which the name Palaeoperidinium bicuneatum was first proposed, as indication of a type (ICN Article 40.3). Age: Oxfordian.
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Original description: [Deflandre, 1939a] (translated from French):
Palæoperidinium bicuneatum n. sp.
Plate VIII, Fig. 7.
Holotype: AM 32.
In this species, the epitheca and hypotheca are conical and approximately equal. They are separated by a narrow transverse groove. The epitheca ends in a short, truncated tube, while the hypotheca has a rounded, very slightly projecting tip. The thin membrane bears various folds, the interpretation of which is not possible. It was clearly stained with hematoxylin. The cell, in its rather strongly flattened state, measures 100 μm long and 65 μm wide. The rather poor state of preservation of the only specimen currently known to me does not allow for a truly objective description: it is only because it belongs to a morphological type quite different from all the others that I have included it. It seems rather difficult to see a Gonyaulax or a Peridinium here; perhaps one could instead suggest a relationship with an Amphidoma, such as Amphidoma acuminata Stein.