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Apteodinium mecsekense
From Fensome et al., 2019:
Apteodinium mecsekense (Nagy, 1969, p.292, pl.1, figs.6,8) Helenes, 1984, p.132. Holotype: Nagy, 1969, pl.1, figs.6,8; Jan du Chêne et al., 1986a, pl.11, figs.10–12. Originally Palaeoperidinium, subsequently Gonyaulacysta?, thirdly
Millioudodinium?, fourthly (and now) Apteodinium. Age: Late Miocene.
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Original description [Nagy, 1969]:
Palaeoperidinium mecsekense n. sp.
Plate I, Fig. 6, 8
Holotype: Borehole H. 53, sample No. 5, slide No. 3, 42.8 x 105.6.
Locus typicus: Hidas.
Stratum typicum: Upper Pannonian, silty clay-marl, borehole H. 53, depth 134.8 to 135.5 m.
Diagnosis: An ellipsoidal theca of 60 and 56 μ size. Epi- and hypotheca are of equal size. Wall 1 to 1.5 μ thick. On one side, the following tabulation is observed: 1’, 3”, transversal furrow 5 to 6 μ wide, 3”’, ?1””. The other side of the test is entirely devoid of tabulation; the edges of the existing tabulation are strongly developed. The apices of the tabulae and the ends of the zone are tapering (Textfig. 3). A few specimens were found in the Pliocene of borehole H. 53.
Differential diagnosis: The species resembles Palaeoperidinium castanea described by Deflandre from the Cretaceous (Deflandre 1936, Ann. Paléont. 25, p. 177, PI. 6, Fig. 1). However, the shape is less rounded, the horizontal furrow is invisible and the epithecal prominence, present on Deflandre’s species, cannot be observed owing to the way the specimen lies in the slide. The surface of our specimen is strongly contaminated.
There is some morphological resemblance to Peridinites rossicus Defl. (Tr. de Paléont. L, 122, and Deflandre 1940). The new species is, however, meridionally elongated, and no longitudinal zone can be observed in it. Peridinites rossicus is an Eocene form, anyway.
Apteodinium mecsekense (Nagy, 1969, p.292, pl.1, figs.6,8) Helenes, 1984, p.132. Holotype: Nagy, 1969, pl.1, figs.6,8; Jan du Chêne et al., 1986a, pl.11, figs.10–12. Originally Palaeoperidinium, subsequently Gonyaulacysta?, thirdly
Millioudodinium?, fourthly (and now) Apteodinium. Age: Late Miocene.
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Original description [Nagy, 1969]:
Palaeoperidinium mecsekense n. sp.
Plate I, Fig. 6, 8
Holotype: Borehole H. 53, sample No. 5, slide No. 3, 42.8 x 105.6.
Locus typicus: Hidas.
Stratum typicum: Upper Pannonian, silty clay-marl, borehole H. 53, depth 134.8 to 135.5 m.
Diagnosis: An ellipsoidal theca of 60 and 56 μ size. Epi- and hypotheca are of equal size. Wall 1 to 1.5 μ thick. On one side, the following tabulation is observed: 1’, 3”, transversal furrow 5 to 6 μ wide, 3”’, ?1””. The other side of the test is entirely devoid of tabulation; the edges of the existing tabulation are strongly developed. The apices of the tabulae and the ends of the zone are tapering (Textfig. 3). A few specimens were found in the Pliocene of borehole H. 53.
Differential diagnosis: The species resembles Palaeoperidinium castanea described by Deflandre from the Cretaceous (Deflandre 1936, Ann. Paléont. 25, p. 177, PI. 6, Fig. 1). However, the shape is less rounded, the horizontal furrow is invisible and the epithecal prominence, present on Deflandre’s species, cannot be observed owing to the way the specimen lies in the slide. The surface of our specimen is strongly contaminated.
There is some morphological resemblance to Peridinites rossicus Defl. (Tr. de Paléont. L, 122, and Deflandre 1940). The new species is, however, meridionally elongated, and no longitudinal zone can be observed in it. Peridinites rossicus is an Eocene form, anyway.