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Kallosphaeridium coninckii
From Fensome et al., 2019:
Kallosphaeridium ?coninckii (Burger, 1980a, p.74, pl.26, figs.5,6a–b) Burger, 1980b, p.277. Holotype: Burger, 1980a, pl.26, figs.6a–b. Originally Membranosphaera, subsequently Kallosphaeridium, thirdly (and now) Kallosphaeridium?. Questionable assignment: Wood et al. (2016, p.78–79). Age: Albian.
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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 28µm 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 µm in total, with a dense cover of hairs 4 µm long, from the Tertiary of Belgium. M. coninckii sp. novo differs from M. romaensis sp. novo by its longer hair-like processes.
Kallosphaeridium ?coninckii (Burger, 1980a, p.74, pl.26, figs.5,6a–b) Burger, 1980b, p.277. Holotype: Burger, 1980a, pl.26, figs.6a–b. Originally Membranosphaera, subsequently Kallosphaeridium, thirdly (and now) Kallosphaeridium?. Questionable assignment: Wood et al. (2016, p.78–79). Age: Albian.
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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 28µm 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 µm in total, with a dense cover of hairs 4 µm long, from the Tertiary of Belgium. M. coninckii sp. novo differs from M. romaensis sp. novo by its longer hair-like processes.