Back
Microdinium carpentieriae
Microdinium carpentierae Slimani, 1994, p.29-30, pl.5, figs.3-4,11-19,25.
Holotype: Slimani, 1994, pl.5, figs.11-13,16-17.
Age: Late Campanian-earliest Danian.
------------------------------------------------------------------------------------------------------------------------------------------------------
Original description (Slimani, 1994) (translated from French):
Microdinium carpentieriae sp. nov.
(P1.5, Fig. 3, 4, 11-19, 25)
Name derivation: In honor of Dr. M. LEJEUNE-CARPENTIER, University of Liège, Belgium.
Holotype: Turnhout -815.89 m, preparation 1, E.F. coordinate N29/2.
Paratype 1: Turnhout -795.24 m, preparation 1, E.F. coordinate Q52.
Paratype 2: Turnhout -775.01 m, preparation 1, E.F. coordinate K49.
Type locality: Turnhout -815.89 m.
Type horizon: Maastrichtian.
Svnonymy:
1971: ?Ceratocorys veiigera (DEFLANDRE, 1937b) - WILSON, pl. 4, fig. 19.
?1974: Microdinium veligerum (DEFLANDRE, 1937b) in WILSON, pl. 12, fig. 7.
?1992: IPhanerodinium veligerum (DEFLANDRE, 1937b) BELOW (1987b) - MARHEINECKE, p. 110, pl. 24, fig. 1-4.
Diagnosis: Small proximate to proximochorate, suturocavate, subspheroidal to ovoid cyst with an epicyst slightly smaller than the hypocyst. The epicyst and hypocyst bear prominent parasutural ridges, while the paracingulum lacks them. The intratabular surfaces have a granulated to vermiculated appearance. The paratabulation is gonyaulacoid and conforms to the formula: 4', ?4a, 6", 6c, 6"', lp, 1"". The archaeopyle is apical and intercalary, type (tAtl)a, with a ventrally attached operculum.
Dimensions: Holotype: maximum diameter of the central body: 22 µm, maximum diameter of the entire cyst: 30 µm. Variations: maximum diameter of the central body: 20-28 µm, maximum diameter of the entire cyst: 28-34 µm. Number of specimens measured: 14.
Material: 16 specimens.
Description: The endophragm (2 µm thick) is in contact with the periphragm in the intratabular areas. The periphragm has prominent suturocavate ridges that are rigid, smooth, and triangular in cross-section; these ridges are very broad proximally and sharp distally with distal cutting edges that are often lumpy to gratinated. The intratabular ornamentation consists of granules or projections (1 to 2 µm) that may be flared distally and weakly intertwined in places, giving a granulated to vermiculated appearance. The paracingulum is indicated by an interruption of the epicystal and hypocystal ridges and by an abrupt decrease in the height of the continuous ridges that traverse the entire length of the cyst. The parasulcus contains a flagellar pore, and the posterior sulcal paraplate is omega-shaped, delimited by more or less pronounced lines. The arrangement of the hypocystal paraplates is apparently partifomous. The boundary between 1 and 1p is not clearly discernible. The operculum is composed of 9 paraplates, very rarely discernible: 1 preapical, 4 apical, and 4 anterior intercalary.
Comparison: This species is characterized by its distinctly prominent suturocavate ridges and the absence of paracingulate ridges. These characteristics are not those of Rhiptocorys veligera (DEFLANDRE, 1937b) LEJEUNE-CARPENTIER and SARJEANT (1983), whose holotype was reexamined by LEJEUNE-CARPENTIER. We then share the same opinion as LEJEUNE-CARPENTIER AND SARJEANT (1983, p. 8) who consider that the specimen named ?Ceratocorys veligera in WILSON (1971), found in the Maastrichtian of Denmark is not attributable to R. veligera. The difference is even clearer when we refer to the emendation of R. veligera by BELOW (1987b: p. 56-57) as well as to the emendation of Rluptoc orys in the present work. It seems to us that Microdinium is the only genus to which the species described above is attributable. The specimens of Whanerodinium veiigerum in MARHEINECKE (1992), found in the Maastrichtian of Hemmoor in Germany, closely resemble our specimens. Microdinium carpentieriae sp. nov. differs from Microdinium deconinckii sp. nov. primarily by the absence of paracingulate ridges and by its much higher, triangular-section ridges with often lumpy to gratinated distal edges; the latter species is characterized by its often spongy wall and ridges that are suturocavate but rounded and lower.
Stratigraphic distribution: Turnhout: -892.87 to -759.89 m, upper part of the Lower Maastrichtian - end of the Upper Maastrichtian, beginning of the Danian. In WILSON (1974), Campanian - Maastrichtian, Maastricht region and Denmark. MARHEINECKE (1992), Upper Maastrichtian, Hemmoor, Germany.
Holotype: Slimani, 1994, pl.5, figs.11-13,16-17.
Age: Late Campanian-earliest Danian.
------------------------------------------------------------------------------------------------------------------------------------------------------
Original description (Slimani, 1994) (translated from French):
Microdinium carpentieriae sp. nov.
(P1.5, Fig. 3, 4, 11-19, 25)
Name derivation: In honor of Dr. M. LEJEUNE-CARPENTIER, University of Liège, Belgium.
Holotype: Turnhout -815.89 m, preparation 1, E.F. coordinate N29/2.
Paratype 1: Turnhout -795.24 m, preparation 1, E.F. coordinate Q52.
Paratype 2: Turnhout -775.01 m, preparation 1, E.F. coordinate K49.
Type locality: Turnhout -815.89 m.
Type horizon: Maastrichtian.
Svnonymy:
1971: ?Ceratocorys veiigera (DEFLANDRE, 1937b) - WILSON, pl. 4, fig. 19.
?1974: Microdinium veligerum (DEFLANDRE, 1937b) in WILSON, pl. 12, fig. 7.
?1992: IPhanerodinium veligerum (DEFLANDRE, 1937b) BELOW (1987b) - MARHEINECKE, p. 110, pl. 24, fig. 1-4.
Diagnosis: Small proximate to proximochorate, suturocavate, subspheroidal to ovoid cyst with an epicyst slightly smaller than the hypocyst. The epicyst and hypocyst bear prominent parasutural ridges, while the paracingulum lacks them. The intratabular surfaces have a granulated to vermiculated appearance. The paratabulation is gonyaulacoid and conforms to the formula: 4', ?4a, 6", 6c, 6"', lp, 1"". The archaeopyle is apical and intercalary, type (tAtl)a, with a ventrally attached operculum.
Dimensions: Holotype: maximum diameter of the central body: 22 µm, maximum diameter of the entire cyst: 30 µm. Variations: maximum diameter of the central body: 20-28 µm, maximum diameter of the entire cyst: 28-34 µm. Number of specimens measured: 14.
Material: 16 specimens.
Description: The endophragm (2 µm thick) is in contact with the periphragm in the intratabular areas. The periphragm has prominent suturocavate ridges that are rigid, smooth, and triangular in cross-section; these ridges are very broad proximally and sharp distally with distal cutting edges that are often lumpy to gratinated. The intratabular ornamentation consists of granules or projections (1 to 2 µm) that may be flared distally and weakly intertwined in places, giving a granulated to vermiculated appearance. The paracingulum is indicated by an interruption of the epicystal and hypocystal ridges and by an abrupt decrease in the height of the continuous ridges that traverse the entire length of the cyst. The parasulcus contains a flagellar pore, and the posterior sulcal paraplate is omega-shaped, delimited by more or less pronounced lines. The arrangement of the hypocystal paraplates is apparently partifomous. The boundary between 1 and 1p is not clearly discernible. The operculum is composed of 9 paraplates, very rarely discernible: 1 preapical, 4 apical, and 4 anterior intercalary.
Comparison: This species is characterized by its distinctly prominent suturocavate ridges and the absence of paracingulate ridges. These characteristics are not those of Rhiptocorys veligera (DEFLANDRE, 1937b) LEJEUNE-CARPENTIER and SARJEANT (1983), whose holotype was reexamined by LEJEUNE-CARPENTIER. We then share the same opinion as LEJEUNE-CARPENTIER AND SARJEANT (1983, p. 8) who consider that the specimen named ?Ceratocorys veligera in WILSON (1971), found in the Maastrichtian of Denmark is not attributable to R. veligera. The difference is even clearer when we refer to the emendation of R. veligera by BELOW (1987b: p. 56-57) as well as to the emendation of Rluptoc orys in the present work. It seems to us that Microdinium is the only genus to which the species described above is attributable. The specimens of Whanerodinium veiigerum in MARHEINECKE (1992), found in the Maastrichtian of Hemmoor in Germany, closely resemble our specimens. Microdinium carpentieriae sp. nov. differs from Microdinium deconinckii sp. nov. primarily by the absence of paracingulate ridges and by its much higher, triangular-section ridges with often lumpy to gratinated distal edges; the latter species is characterized by its often spongy wall and ridges that are suturocavate but rounded and lower.
Stratigraphic distribution: Turnhout: -892.87 to -759.89 m, upper part of the Lower Maastrichtian - end of the Upper Maastrichtian, beginning of the Danian. In WILSON (1974), Campanian - Maastrichtian, Maastricht region and Denmark. MARHEINECKE (1992), Upper Maastrichtian, Hemmoor, Germany.