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Odontochitina streelii
Odontochitina streelii SSlimani, 1996, p.377–378, pl.3, figs.A–C; text-figs.6A–B ex Slimani, 2001b, p.5, pl.2, figs.1–2; pl.3, fig..5. Holotype: Slimani, 1996, pl.3, figs.A–B; Slimani, 2001b, pl.2, figs.1–2. This name was not validly published in Slimani (1996) since no English or Latin description or diagnosis was provided. Age: late Campanian–early Maastrichtian.
Original description (Slimani, 1996) Translation PKB 2025
Derivation of the name. In honor of Prof. Dr. Maurice Streel, Associated Services of Paleontology, University of Liège, Liège, Belgium.
Holotype. Beutenake ech. 20, preparation 1, coord. E.F. Pl. 3 Fig. A, B.
Paratype. Beutenaken ech. 20, preparation 2, coord. E.F. F42/4; Pl. 3, Fig. c.
Typical locality. Beutenaken ech, 20.
Typical horizon. Maastrichtian.
Occurrence. Beutenaken: ex. 6 to 21 (late Campanian); Turnhout -933 to - 892.87 m (upper Campanian).
Description. Cysts, rigid cornucavate and bearing three thin horns whose pointed distal end is sometimes deteriorated. The right postcingulate horn is generally shorter than the antapical. The periphragm is heavily adorned with low ridges which give it a striated and at the same time tabulated appearance. The endophragm is thicker than the periphragm (2 to 3 µm) and infrareticular. These two membranes are closely attached on the central body and separate at the horns. On the central body, intratabular ridges at the periphragm outline the paraplates. On the horns, longitudinal ridges are observed. The paratabulation is partial to almost complete and follows the corniform gonyalacoid pattern: there are 6 precingulate paraplates (2-1i), apparently 5 cingulates (au-?e), 56 postcingulates (II-VIi), X sulcals and apparently 1 antapical (Y) and 1 posterior intercalary which form the antapical horn. The paracingulum of about 4 to 6 µm in width is slightly levorotatory. The cingulate crests stop dorsally on the lateral edge of the right horn at the base of which they often reveal two small projections marking the right limit of the cingulate paraplate d, or else continue slightly on the ventral surface. The narrow, striated and undifferentiated parasulcal surface is not clearly delimited. The precingulate paraplate ì and a posterior paraplate (apparently VIu) are not striated. The paraplate 1i is well delimited, elongated longitudinally and widens posteriorly in a V. The archaeopyle is apical with a circular and continuous edge. The operculum is free. We do not know the number of apical paraplates since we did not observe an operculum.
Dimensions. Length of central body without operculum: holotype, 66 µm; paratype 46 µm; other specimens. 50-60 µm. Length of lateral horn: holotype, 72 µm; paratype, 74 µm; length of antapical crone: holotype, 98 µm; paratype, 90 µm; length of both horns in other specimens, 70-110 µm. Number of specimens measured: 7.
Notes. Odontochitina streellii sp. nov. is distinguished from Odontochitina operculata (O. Wetzel, 1933) Deflandre and Cookson (1955) by its ornamentation which emphasizes the paratabulation on the periphragm and by the continuous edge of its archaeopyle. It differs from Xenascus wetzelii sp. nov. (in this work) by its thin, simple and often pointed horns at their distal end, by its less thick and more finely reticulated endophragm, by the absence of processes and especially by its striated surface. In Odontochitina costata Alberti (1961), only the horns are striated and in addition perforated.
Stratigraphic and geographical distribution. Denmark, Belgium and the Netherlands [in Wilson (1974); Upper Campanian - Lower Maastrichtian (B. lanceolata Zone)]
Original description (Slimani, 1996) Translation PKB 2025
Derivation of the name. In honor of Prof. Dr. Maurice Streel, Associated Services of Paleontology, University of Liège, Liège, Belgium.
Holotype. Beutenake ech. 20, preparation 1, coord. E.F. Pl. 3 Fig. A, B.
Paratype. Beutenaken ech. 20, preparation 2, coord. E.F. F42/4; Pl. 3, Fig. c.
Typical locality. Beutenaken ech, 20.
Typical horizon. Maastrichtian.
Occurrence. Beutenaken: ex. 6 to 21 (late Campanian); Turnhout -933 to - 892.87 m (upper Campanian).
Description. Cysts, rigid cornucavate and bearing three thin horns whose pointed distal end is sometimes deteriorated. The right postcingulate horn is generally shorter than the antapical. The periphragm is heavily adorned with low ridges which give it a striated and at the same time tabulated appearance. The endophragm is thicker than the periphragm (2 to 3 µm) and infrareticular. These two membranes are closely attached on the central body and separate at the horns. On the central body, intratabular ridges at the periphragm outline the paraplates. On the horns, longitudinal ridges are observed. The paratabulation is partial to almost complete and follows the corniform gonyalacoid pattern: there are 6 precingulate paraplates (2-1i), apparently 5 cingulates (au-?e), 56 postcingulates (II-VIi), X sulcals and apparently 1 antapical (Y) and 1 posterior intercalary which form the antapical horn. The paracingulum of about 4 to 6 µm in width is slightly levorotatory. The cingulate crests stop dorsally on the lateral edge of the right horn at the base of which they often reveal two small projections marking the right limit of the cingulate paraplate d, or else continue slightly on the ventral surface. The narrow, striated and undifferentiated parasulcal surface is not clearly delimited. The precingulate paraplate ì and a posterior paraplate (apparently VIu) are not striated. The paraplate 1i is well delimited, elongated longitudinally and widens posteriorly in a V. The archaeopyle is apical with a circular and continuous edge. The operculum is free. We do not know the number of apical paraplates since we did not observe an operculum.
Dimensions. Length of central body without operculum: holotype, 66 µm; paratype 46 µm; other specimens. 50-60 µm. Length of lateral horn: holotype, 72 µm; paratype, 74 µm; length of antapical crone: holotype, 98 µm; paratype, 90 µm; length of both horns in other specimens, 70-110 µm. Number of specimens measured: 7.
Notes. Odontochitina streellii sp. nov. is distinguished from Odontochitina operculata (O. Wetzel, 1933) Deflandre and Cookson (1955) by its ornamentation which emphasizes the paratabulation on the periphragm and by the continuous edge of its archaeopyle. It differs from Xenascus wetzelii sp. nov. (in this work) by its thin, simple and often pointed horns at their distal end, by its less thick and more finely reticulated endophragm, by the absence of processes and especially by its striated surface. In Odontochitina costata Alberti (1961), only the horns are striated and in addition perforated.
Stratigraphic and geographical distribution. Denmark, Belgium and the Netherlands [in Wilson (1974); Upper Campanian - Lower Maastrichtian (B. lanceolata Zone)]