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Lejeunecysta fallax
Lejeunecysta fallax (Morgenroth, 1966b, p.2–3, pl.1, figs.6–7) Artzner and Dörhöfer, 1978, p.1381. Emendation: Biffi and Grignani, 1983, p.132, as Lejeunecysta fallax.
Originally Lejeunia (an illegitimate generic name), subsequently (and now) Lejeunecysta.
Holotype: Morgenroth, 1966, pl.1, fig.6
Paratypes: Morgenroth, 1966
Locus typicus: Eschershausen, Germany
Stratum typicum: Middle Oligocene
Translation Morgenroth, 1966: LPP
Original description: Morgenroth, 1966, p. 3: Lejeunia fallax
Diagnosis: A species of the genus Lejeunia with smooth, firm membrane. Instead of a girdle furrow, only a ?circularly running ridge is present.
Description: The, compared to other species of the genus, firm shell membrane is smooth. Striations are not present. The cone-shaped epitheca culminates in a clearly pointed apical horn. A girdle furrow is not present. Instead, a simple, sharp crest, which runs more or less circularly, is present. Ventrally it is interrupted by a suggested longitudinal furrow. The hypotheca culminates in 2 more or less equally long antapical horns. - None of the specimens present shows an opening.
Dimensions: Shell length: 77(64/84) Ám, shell width 63(53/70) Ám.
Emended diagnosis: Biffi and Grignai, 1983, p. 132: Lejeunecysta fallax
Autocyst proximate, peridinioid, compressed dorsoventrally with a pentagonal ambitus. Epicyst commonly longer than hypocyst, conical, with acuminate apex and straight to slightly convex sides. Hypocyst with straight flanks, two long, well developed, acuminate antapical horns. Antapical depression prominent. Autophragm smooth. Continuous paracingulum marked by straight, transverse folds. Hexa archeopyle formed by loss of intercalary 2a, and symmetrically situated on middorsal line.
Dimensions: Autocyst length 53-80 Ám, breadth 52-75 Ám. Number of specimens measured, 20.
Remarks: Lejeunecysta fallax is here emended to emphasize the specific features of this species:
a) epicyst conical with an acuminate apex, but without a distinct apical horn (i.e., as in L. communis, n.sp.);
b) hypocyst with straight flanks, two long, well-developed, acuminate antapical horns and a prominent antapical depression;
c) epicyst commonly longer than hypocyst;
d) paracingulum continuous, marked by straight, transverse folds, not excavate;
e) autophragm smooth;
f) archeopyle hexa standard.
Originally Lejeunia (an illegitimate generic name), subsequently (and now) Lejeunecysta.
Holotype: Morgenroth, 1966, pl.1, fig.6
Paratypes: Morgenroth, 1966
Locus typicus: Eschershausen, Germany
Stratum typicum: Middle Oligocene
Translation Morgenroth, 1966: LPP
Original description: Morgenroth, 1966, p. 3: Lejeunia fallax
Diagnosis: A species of the genus Lejeunia with smooth, firm membrane. Instead of a girdle furrow, only a ?circularly running ridge is present.
Description: The, compared to other species of the genus, firm shell membrane is smooth. Striations are not present. The cone-shaped epitheca culminates in a clearly pointed apical horn. A girdle furrow is not present. Instead, a simple, sharp crest, which runs more or less circularly, is present. Ventrally it is interrupted by a suggested longitudinal furrow. The hypotheca culminates in 2 more or less equally long antapical horns. - None of the specimens present shows an opening.
Dimensions: Shell length: 77(64/84) Ám, shell width 63(53/70) Ám.
Emended diagnosis: Biffi and Grignai, 1983, p. 132: Lejeunecysta fallax
Autocyst proximate, peridinioid, compressed dorsoventrally with a pentagonal ambitus. Epicyst commonly longer than hypocyst, conical, with acuminate apex and straight to slightly convex sides. Hypocyst with straight flanks, two long, well developed, acuminate antapical horns. Antapical depression prominent. Autophragm smooth. Continuous paracingulum marked by straight, transverse folds. Hexa archeopyle formed by loss of intercalary 2a, and symmetrically situated on middorsal line.
Dimensions: Autocyst length 53-80 Ám, breadth 52-75 Ám. Number of specimens measured, 20.
Remarks: Lejeunecysta fallax is here emended to emphasize the specific features of this species:
a) epicyst conical with an acuminate apex, but without a distinct apical horn (i.e., as in L. communis, n.sp.);
b) hypocyst with straight flanks, two long, well-developed, acuminate antapical horns and a prominent antapical depression;
c) epicyst commonly longer than hypocyst;
d) paracingulum continuous, marked by straight, transverse folds, not excavate;
e) autophragm smooth;
f) archeopyle hexa standard.