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Lejeunia hyalina
Lejeunia hyalina Gerlach, 1961; Emendations: Kjellström, 1972, p.469, as Lejeunia hyalina; Sarjeant, 1984b, p.89–90, as Lejeunecysta hyalina.
NOW Lejeunecysta. Originally Lejeunia (generic name illegitimate), subsequently (and now) Lejeunecysta.
Following I.C.N. Article 55.1, the species name Lejeunia hyalina is validly published even though the generic name Lejeunia is illegitimate.
Holotype: Gerlach, 1961, pl.26, figs.10-11
Locus typicus: Emsb³ren, NW Germany
Stratum typicum: Late Oligocene
Translation Gerlach, 1961: Sarjeant, 1984
Translation Gocht, 1969: Geological Survey of Canada
Original diagnosis: Gerlach,1961, p.169
Typical species of the genus Lejeunia. Apical horn and antapical horns more or less widely splayed out. Membrane thin, striped by vertically directed foldlets. Girdle furrow narrow, only slightly sunken, with distance of offset of 1/2 to 1 furrow breadth. Longitudinal furrow indicated.
Gocht, 1969, p.27,28:
There were two specimens of this species, both from the deeper part of Early Eocene 1, or considerably earlier than the Oligocene finds of Gerlach.
One of the two specimens has a pyrites core and has thus been preserved intact, showing all the fine details when illuminated from above unimbedded. Its habit resembles that of the type specimen. The slightly smaller epitheca is triangular in the dorsoventral view, and the hypotheca trapezoidal, with antapical horns of unequal size. The armor is- evidently primarily- compressed. The slightly helicoid cingulum is ledgelike, not indented, but the longitudinal furrow is sunken deep into the body, interrupting the cingulum and extending from the antapex approximately to the lowest third of the epitheca. The ends of the cingulum on the edge of the longitudinal furrow stand out like short "horns". The body is endowed with many fine longitudinal striae or folds, already mentioned by Gerlach. It is not known whether these are primary or secondary formations. There are no indications of tabulation, and no archeopyle. This also corresponds with Gerlach"s observations.
The second specimen is flattened and preserved as a gel preparation. It shows the fragility of the membrane and the longitudinal folds, which are much more irregular here because of the compression. Also the longitudinal furrow, of course, appears shallow. The morphological affinity with Peridinium species is discussed at length by Gerlach.
Occurrence: Early Eocene.
NOW Lejeunecysta. Originally Lejeunia (generic name illegitimate), subsequently (and now) Lejeunecysta.
Following I.C.N. Article 55.1, the species name Lejeunia hyalina is validly published even though the generic name Lejeunia is illegitimate.
Holotype: Gerlach, 1961, pl.26, figs.10-11
Locus typicus: Emsb³ren, NW Germany
Stratum typicum: Late Oligocene
Translation Gerlach, 1961: Sarjeant, 1984
Translation Gocht, 1969: Geological Survey of Canada
Original diagnosis: Gerlach,1961, p.169
Typical species of the genus Lejeunia. Apical horn and antapical horns more or less widely splayed out. Membrane thin, striped by vertically directed foldlets. Girdle furrow narrow, only slightly sunken, with distance of offset of 1/2 to 1 furrow breadth. Longitudinal furrow indicated.
Gocht, 1969, p.27,28:
There were two specimens of this species, both from the deeper part of Early Eocene 1, or considerably earlier than the Oligocene finds of Gerlach.
One of the two specimens has a pyrites core and has thus been preserved intact, showing all the fine details when illuminated from above unimbedded. Its habit resembles that of the type specimen. The slightly smaller epitheca is triangular in the dorsoventral view, and the hypotheca trapezoidal, with antapical horns of unequal size. The armor is- evidently primarily- compressed. The slightly helicoid cingulum is ledgelike, not indented, but the longitudinal furrow is sunken deep into the body, interrupting the cingulum and extending from the antapex approximately to the lowest third of the epitheca. The ends of the cingulum on the edge of the longitudinal furrow stand out like short "horns". The body is endowed with many fine longitudinal striae or folds, already mentioned by Gerlach. It is not known whether these are primary or secondary formations. There are no indications of tabulation, and no archeopyle. This also corresponds with Gerlach"s observations.
The second specimen is flattened and preserved as a gel preparation. It shows the fragility of the membrane and the longitudinal folds, which are much more irregular here because of the compression. Also the longitudinal furrow, of course, appears shallow. The morphological affinity with Peridinium species is discussed at length by Gerlach.
Occurrence: Early Eocene.