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Ifecysta heterospinosa
Ifecysta heterospinosa Antolinez-Delgado and Oboh-Ikuenobe, 2007, p.58–60, pl.1, fig.7; pl.2, fig.5.
Holotype: Antolinez-Delgado and Oboh-Ikuenobe, 2007, pl.1, fig.7.
Age: Paleocene–?earliest Eocene.
Original description (Antolinez-Delgado and Oboh-Ikuenobe, 2007):
Ifecysta heterospinosa sp. nov. Plate 1, fig. 7; Plate 2, fig. 5.
Derivation of name. From the Greek hetero, meaning different, and spinosus, meaning thorny, with reference to the two types of process complexes present in the cingulum and the major plate series.
Holotype. Plate 1, figure 7, slide R-1134-7, Lovins finder coordinates 24E/F. Alo-1 well, 329.2 m, Upper Paleocene. Dimensions: length, including apical and antapical horn-like protrusions, 100 µm; width 66 µm; height of processes 18 µm.
Diagnosis. A species of Ifecysta with penitabular processes in simulate complexes in the major plate series, and linear complexes in the cingular series.
Description. Proximochorate dinoflagellate cysts with an ellipsoidal to fusiform body, fibrous endophragm and periphragm, and distinct apical and antapical horn-like protusions of approximately equal size. Endophragm and periphragm closely appressed together even apically and antapically. Fibrous expansions at the top of the horn-like protrusions are usually present. Fibrous penitabular processes in simulate complexes delineate the major plate series. Cingulum well defined by a series of transverse linear complexes, each complex located in the center of the cingular plates. Sulcal series not observed. Tabulation formula 4', 6'', 5c, 6''', 1'''', ?s. Archeopyle precingular, type P3'', operculum free.
Dimensions. Length, including apical and antapical hornlike protrusions, 85–100 µm; width 60–70 µm; height of processes 15 µm (7 specimens measured).
Comparison. Ifecysta heterospinosa sp. nov differs from Damassadinium californicum(Drugg 1967) Fensome et al. 1993, Ifecysta fusiforma sp. nov., Ifecysta lappacea (Drugg 1970) com. nov., and Ifecysta pachyderma Jan du Chêne & Adediran 1985 in having penitabular processes in simulate complexes, rather than nontabular or large solid penitabular processes.
Stratigraphic range. Ifecysta heterospinosa sp. nov. was observed in the Alo-1 well from 73 m to 768.1 m.
Holotype: Antolinez-Delgado and Oboh-Ikuenobe, 2007, pl.1, fig.7.
Age: Paleocene–?earliest Eocene.
Original description (Antolinez-Delgado and Oboh-Ikuenobe, 2007):
Ifecysta heterospinosa sp. nov. Plate 1, fig. 7; Plate 2, fig. 5.
Derivation of name. From the Greek hetero, meaning different, and spinosus, meaning thorny, with reference to the two types of process complexes present in the cingulum and the major plate series.
Holotype. Plate 1, figure 7, slide R-1134-7, Lovins finder coordinates 24E/F. Alo-1 well, 329.2 m, Upper Paleocene. Dimensions: length, including apical and antapical horn-like protrusions, 100 µm; width 66 µm; height of processes 18 µm.
Diagnosis. A species of Ifecysta with penitabular processes in simulate complexes in the major plate series, and linear complexes in the cingular series.
Description. Proximochorate dinoflagellate cysts with an ellipsoidal to fusiform body, fibrous endophragm and periphragm, and distinct apical and antapical horn-like protusions of approximately equal size. Endophragm and periphragm closely appressed together even apically and antapically. Fibrous expansions at the top of the horn-like protrusions are usually present. Fibrous penitabular processes in simulate complexes delineate the major plate series. Cingulum well defined by a series of transverse linear complexes, each complex located in the center of the cingular plates. Sulcal series not observed. Tabulation formula 4', 6'', 5c, 6''', 1'''', ?s. Archeopyle precingular, type P3'', operculum free.
Dimensions. Length, including apical and antapical hornlike protrusions, 85–100 µm; width 60–70 µm; height of processes 15 µm (7 specimens measured).
Comparison. Ifecysta heterospinosa sp. nov differs from Damassadinium californicum(Drugg 1967) Fensome et al. 1993, Ifecysta fusiforma sp. nov., Ifecysta lappacea (Drugg 1970) com. nov., and Ifecysta pachyderma Jan du Chêne & Adediran 1985 in having penitabular processes in simulate complexes, rather than nontabular or large solid penitabular processes.
Stratigraphic range. Ifecysta heterospinosa sp. nov. was observed in the Alo-1 well from 73 m to 768.1 m.