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Membranosphaera coninckii
Membraosphaera coninckii Burger, 1980
Now Kallosphaeridium. Originally Membranosphaera, subsequently (and now) Kallosphaeridium.
Holotype: Burger, 1980, pl.26, fig.6
Age: Albian
Original description (Burger, 1980):
Membranosphaera coninckii sp. nov. PI. 26, figs. 5, 6
Holotype: BMR Roma 9, depth 61.0 m (200 ft 1 in); Wallumbilla Formation, Coreena Member. Cretaceous, early Albian (MFP 4616-1, 405/1178; CPC 16348. PI. 26, fig. 6).
Description: Cyst spherical to egg-shaped. Archaeopyle large, apical, with an approximately circular outline, margin notched and indicating the presence of 6 precingular paraplates. An operculum is still attached in a number of specimens. No. traces of a paracingulum or other paratabulation are visible. Cyst wall thin and densely covered with numerous tiny, hair-like spines 2-6 µm long.
Dimensions: Apical diameter of 5 dehisced specimens 32-45 (µm, width (10 specimens) 32-50 (µm.
Distribution: A rare species in assemblages of the upper part of the Odontochitina operculata Zone, and the Pseudoceratium turneri Zone.
Comments: Dinoflagellates of this type have not often been reported. Deflandre & Courteville (1939) described from the Senonian of France their Hystrichosphaeridium whitei, which has densely spaced and hair-like processes up to 28 (Lm long, but does not develop an archaeopyle and has no traces of parasutures. De Coninck (1968) described as Kallosphaeridium brevibarbatum a few comparable (if not identical) but very poorly preserved specimens, measuring 68 (Lm in total, with a dense cover of hairs 4 (Lm long, from the Tertiary of Belgium. M. coninckii sp. novo differs from M. romaensis sp. novo by its longer hair-like processes.
Now Kallosphaeridium. Originally Membranosphaera, subsequently (and now) Kallosphaeridium.
Holotype: Burger, 1980, pl.26, fig.6
Age: Albian
Original description (Burger, 1980):
Membranosphaera coninckii sp. nov. PI. 26, figs. 5, 6
Holotype: BMR Roma 9, depth 61.0 m (200 ft 1 in); Wallumbilla Formation, Coreena Member. Cretaceous, early Albian (MFP 4616-1, 405/1178; CPC 16348. PI. 26, fig. 6).
Description: Cyst spherical to egg-shaped. Archaeopyle large, apical, with an approximately circular outline, margin notched and indicating the presence of 6 precingular paraplates. An operculum is still attached in a number of specimens. No. traces of a paracingulum or other paratabulation are visible. Cyst wall thin and densely covered with numerous tiny, hair-like spines 2-6 µm long.
Dimensions: Apical diameter of 5 dehisced specimens 32-45 (µm, width (10 specimens) 32-50 (µm.
Distribution: A rare species in assemblages of the upper part of the Odontochitina operculata Zone, and the Pseudoceratium turneri Zone.
Comments: Dinoflagellates of this type have not often been reported. Deflandre & Courteville (1939) described from the Senonian of France their Hystrichosphaeridium whitei, which has densely spaced and hair-like processes up to 28 (Lm long, but does not develop an archaeopyle and has no traces of parasutures. De Coninck (1968) described as Kallosphaeridium brevibarbatum a few comparable (if not identical) but very poorly preserved specimens, measuring 68 (Lm in total, with a dense cover of hairs 4 (Lm long, from the Tertiary of Belgium. M. coninckii sp. novo differs from M. romaensis sp. novo by its longer hair-like processes.