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Ifecysta fusiforma
Ifecysta fusiforma Antolinez-Delgado and Oboh-Ikuenobe, 2007, p.58, pl.1, figs.1–3.
Holotype: Antolinez-Delgado and Oboh-Ikuenobe, 2007, pl.1, fig.1.
Age: Paleocene–?earliest Eocene.
Original description (Antolinez-Delgado and Oboh-Ikuenobe, 2007):
Ifecysta fusiforma sp. nov. Plate 1, figs. 1–3.
Derivation of name. From the Latin fusus, meaning extended, with reference to the elongate shape of the cyst.
Holotype. Plate 1, figure 1, slide R-1134-8, Lovins finder coordinates 7H/J. Alo-1 well, 384 m, Upper Paleocene. Dimensions holotype: length, including the apical and antapical horn-like protrusions, 123 µm; width 58 µm; height of processes 10 µm.
Diagnosis. A species of Ifecysta with fibrous tubiform to buccinate nontabular processes.
Description. Proximochorate dinoflagellate cysts with an ellipsoidal to fusiform body, fibrous endophragm and periphragm, and distinct apical and antapical horn-like protrusions of approximately equal size. These protrusions can be as long as 30 µm, but are usually approximately 15 µm. Endophragm and periphragm closely appressed together even apically and antapically. Fibrous expansions at the top of the horn-like protrusions are usually present. Processes nontabular (up to 3 per plate area), fibrous, tubiform to buccinate, of variable size among specimens. Cingulum and sulcus poorly defined. Archeopyle precingular, type P3'' operculum free.
Dimensions. Length 75–123 µm; width 45–65 µm; height of processes 10–20 µm (7 specimens measured).
Comparison. Ifecysta fusiforma sp. nov. differs from Ifecysta pachyderma Jan du Chêne & Adediran 1985 in having fibrous, nontabular tubiform to buccinate processes, rather than large, solid penitabular processes. Ifecysta lappacea (Drugg 1970) comb. nov. also possesses fibrous nontabular processes, but they are closed proximally and distally, and are more densely distributed than in Ifecysta fusiforma sp. nov.
Stratigraphic range. Ifecysta fusiforma sp. nov. was observed in the Alo-1 well from 54.9 m to 603.5 m.
Holotype: Antolinez-Delgado and Oboh-Ikuenobe, 2007, pl.1, fig.1.
Age: Paleocene–?earliest Eocene.
Original description (Antolinez-Delgado and Oboh-Ikuenobe, 2007):
Ifecysta fusiforma sp. nov. Plate 1, figs. 1–3.
Derivation of name. From the Latin fusus, meaning extended, with reference to the elongate shape of the cyst.
Holotype. Plate 1, figure 1, slide R-1134-8, Lovins finder coordinates 7H/J. Alo-1 well, 384 m, Upper Paleocene. Dimensions holotype: length, including the apical and antapical horn-like protrusions, 123 µm; width 58 µm; height of processes 10 µm.
Diagnosis. A species of Ifecysta with fibrous tubiform to buccinate nontabular processes.
Description. Proximochorate dinoflagellate cysts with an ellipsoidal to fusiform body, fibrous endophragm and periphragm, and distinct apical and antapical horn-like protrusions of approximately equal size. These protrusions can be as long as 30 µm, but are usually approximately 15 µm. Endophragm and periphragm closely appressed together even apically and antapically. Fibrous expansions at the top of the horn-like protrusions are usually present. Processes nontabular (up to 3 per plate area), fibrous, tubiform to buccinate, of variable size among specimens. Cingulum and sulcus poorly defined. Archeopyle precingular, type P3'' operculum free.
Dimensions. Length 75–123 µm; width 45–65 µm; height of processes 10–20 µm (7 specimens measured).
Comparison. Ifecysta fusiforma sp. nov. differs from Ifecysta pachyderma Jan du Chêne & Adediran 1985 in having fibrous, nontabular tubiform to buccinate processes, rather than large, solid penitabular processes. Ifecysta lappacea (Drugg 1970) comb. nov. also possesses fibrous nontabular processes, but they are closed proximally and distally, and are more densely distributed than in Ifecysta fusiforma sp. nov.
Stratigraphic range. Ifecysta fusiforma sp. nov. was observed in the Alo-1 well from 54.9 m to 603.5 m.