Back
Cooksoniella manumii
Cooksoniella manumii, Vozzhennikova, 1967
Lentin and Vozzhennikova, 1990, provided an expanded description for this species, as Chatangiella manumii.
Holotype: Vozzhennikova, 1967, pl.108, fig.1; Lentin and Vozzhennikova, 1990, pl.4, fig.3; text-fig.19
Locus typicus: Kazakhstan (Kustanai), Russia
Stratum typicum: Senonian
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: [Vozzhennikova, 1967, p. 184-185]: (Translation: Lentin and Vozzhennikova, 1990):
Description:
Theca ovalpentagonal, tabulated and divided into almost equal parts. Epitheca triangular, with convex lateral walls or somewhat tapering at the level of the top of the internal body, after which the walls diverge somewhat before coming together to give a conical apical horn which is bluntly truncated at the distal end. Hypotheca trapeziform with two antapical horns of different size. One is short and rounded at the end and may be barely discernible; the other is considerably larger, acutely pointed and triangular in outline, although sometimes it may be blunt-ended and slightly curved.
Transverse furrow equatorial, annulate, and between its ends there is a depression, corresponding in position to the longitudinal furrow and extending a little way onto the epitheca as well as reaching almost to the end of the hypotheca. Theca divided into fields, the boundaries of which are marked by pointed spines. Similar spines occur more sparsely on the surface of the plates and more densely along the margins of the furrows. In many specimens there are small areas between the fields which are devoid of sculpturing and probably correspond to the sutures of tabulated peridinia. The number of fields has not yet been determined accurately. The internal body is oval and occupies the central part of the theca; its lateral walls are adjacent to, or at some distance from, the thecal walls which in turn vary in thickness. Pylome oval-hexagonal.
Lentin and Vozzhennikova, 1990, provided an expanded description for this species, as Chatangiella manumii.
Holotype: Vozzhennikova, 1967, pl.108, fig.1; Lentin and Vozzhennikova, 1990, pl.4, fig.3; text-fig.19
Locus typicus: Kazakhstan (Kustanai), Russia
Stratum typicum: Senonian
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: [Vozzhennikova, 1967, p. 184-185]: (Translation: Lentin and Vozzhennikova, 1990):
Description:
Theca ovalpentagonal, tabulated and divided into almost equal parts. Epitheca triangular, with convex lateral walls or somewhat tapering at the level of the top of the internal body, after which the walls diverge somewhat before coming together to give a conical apical horn which is bluntly truncated at the distal end. Hypotheca trapeziform with two antapical horns of different size. One is short and rounded at the end and may be barely discernible; the other is considerably larger, acutely pointed and triangular in outline, although sometimes it may be blunt-ended and slightly curved.
Transverse furrow equatorial, annulate, and between its ends there is a depression, corresponding in position to the longitudinal furrow and extending a little way onto the epitheca as well as reaching almost to the end of the hypotheca. Theca divided into fields, the boundaries of which are marked by pointed spines. Similar spines occur more sparsely on the surface of the plates and more densely along the margins of the furrows. In many specimens there are small areas between the fields which are devoid of sculpturing and probably correspond to the sutures of tabulated peridinia. The number of fields has not yet been determined accurately. The internal body is oval and occupies the central part of the theca; its lateral walls are adjacent to, or at some distance from, the thecal walls which in turn vary in thickness. Pylome oval-hexagonal.