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Cribroperidinium giuseppei
Cribroperidinium giuseppei (Morgenroth, 1966) Helenes, 1984
Originally Gonyaulax, subsequently Gonyaulacysta, thirdly Millioudodinium?, fourthly Rhynchodiniopsis?, fifthly (and now) Cribroperidinium.
Holotype: Morgenroth, 1966, pl.2, fig. 3-4
Paratypes: Morgenroth, 1966
Locus typicus: Fehmarn, Katharinenhof, NW Germany
Stratum typicum: Early Eocene
Translation Morgenroth, 1966: LPP
Original description: Morgenroth, 1966, p. 6: Gonyaulax giuseppei
Diagnosis: The new species of the genus Gonyaulax has the following tabulation scheme: 4", 6"", 6""", 1p, 1ppl, 1"""". The thin-walled shell is approximately spherical. Epitheca and hypotheca are of about equal size. The short apical horn has the form of two cylinders standing on top of one other, of which the upper one is narrower, so that there is a clear "step". The plates are weakly granulate. They are delimited by sutures formed by ridges with stronger granulation. Parallel to the plate-margins, weakly developed ridges may be developed, concentrically arranged, also with protruding granulation. The helicoidal girdle furrow is situated on the shell. It is bordered on both sides by a ridge with a more pronounced granulation and is displaced two girdle-widths on the ventral side.
Dimensions: length 55 (45/61) Ám, width 50 (47/53) Ám, pylome 22x28 Ám, apical horn 3-4 Ám. 75 measurements.
Helenes, 1984, p. 122
The outline is circular in ventral view. Medium to large size, body diameter ranges from 30 to 50 Ám (c. 80 Ám in subspecies major); horn length c. 7 Ám. Well-developed, low, smooth parasutural ridges are found more often in the hypocyst. Medium to thin-walled. Epi- and hypocyst are approximately the same size.
Affinities
Morgenroth, 1966, p. 6: Gonyaulax giuseppei
(annotated) G. giuseppei and G. granulata have the same tabulation scheme, form and arrangement of plates. The two species differ in the form of the apical horn and in the development of the longitudinal furrow, which is marked on the hypotheca by two lateral narrowings. The sutures in G. giuseppei are without any spines.
G. giuseppei differs from G. granulifera in the development of the apical horn and the total absence of spines.
A connection with G. ambigua and G. tenuitabulata is rejected, on the basis of the different development and arrangement of the plates.
Originally Gonyaulax, subsequently Gonyaulacysta, thirdly Millioudodinium?, fourthly Rhynchodiniopsis?, fifthly (and now) Cribroperidinium.
Holotype: Morgenroth, 1966, pl.2, fig. 3-4
Paratypes: Morgenroth, 1966
Locus typicus: Fehmarn, Katharinenhof, NW Germany
Stratum typicum: Early Eocene
Translation Morgenroth, 1966: LPP
Original description: Morgenroth, 1966, p. 6: Gonyaulax giuseppei
Diagnosis: The new species of the genus Gonyaulax has the following tabulation scheme: 4", 6"", 6""", 1p, 1ppl, 1"""". The thin-walled shell is approximately spherical. Epitheca and hypotheca are of about equal size. The short apical horn has the form of two cylinders standing on top of one other, of which the upper one is narrower, so that there is a clear "step". The plates are weakly granulate. They are delimited by sutures formed by ridges with stronger granulation. Parallel to the plate-margins, weakly developed ridges may be developed, concentrically arranged, also with protruding granulation. The helicoidal girdle furrow is situated on the shell. It is bordered on both sides by a ridge with a more pronounced granulation and is displaced two girdle-widths on the ventral side.
Dimensions: length 55 (45/61) Ám, width 50 (47/53) Ám, pylome 22x28 Ám, apical horn 3-4 Ám. 75 measurements.
Helenes, 1984, p. 122
The outline is circular in ventral view. Medium to large size, body diameter ranges from 30 to 50 Ám (c. 80 Ám in subspecies major); horn length c. 7 Ám. Well-developed, low, smooth parasutural ridges are found more often in the hypocyst. Medium to thin-walled. Epi- and hypocyst are approximately the same size.
Affinities
Morgenroth, 1966, p. 6: Gonyaulax giuseppei
(annotated) G. giuseppei and G. granulata have the same tabulation scheme, form and arrangement of plates. The two species differ in the form of the apical horn and in the development of the longitudinal furrow, which is marked on the hypotheca by two lateral narrowings. The sutures in G. giuseppei are without any spines.
G. giuseppei differs from G. granulifera in the development of the apical horn and the total absence of spines.
A connection with G. ambigua and G. tenuitabulata is rejected, on the basis of the different development and arrangement of the plates.