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Apteodinium bucculiatum
Apteodinium bucculiatum, Davies, 1983
Holotype: Davies, 1983, pl.4, figs.13-14; Jan du Chêne et al.,1986, pl. 150, fig.19
Locus typicus: Melville Island, District of Franklin, Northwest Territories, Canada
Stratum typicum: Callovian-Oxfordian
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Original description: [Davies, 1983, p. 20]:
Diagnosis:
Proximate dinoflagellate cysts, heart shaped with an elongated, pointed to roundly terminated apical horn and two antapical bulges. Ornament is granulate. Cingulum and tabulation usually not present or poorly defined. Archeopyle: P(3).
Description:
The granulation is more strongly developed at the apex, cingulum and antapex. The granulate elements are globular in shape and less than 1.0 µm (generally less than 0.5 µm) in diameter. A distinct omphalos is present at the cingular-ventral area.
The cingulum is poorly defined, flanked by adcingular lateral bulges. Autophragm is less than 0.5 µm thick and thickened at the apex of the apical horn which is 16-25 µm long. The antapex has two small lateral bulges (5 µm high; 11 µm wide). Tabulation is indistinct or not visible. In the holotype, alignment of granules outlines a dorsal postcingular plate (?3""").
Dimensions:
Size: length - 77(85)90 µm; breadth- 77(68)65 µm.
Affinities:
This species is similar to A. granulatum, but is distinguished by its more distinct apical horn, and the presence of adcingular lateral bulges and two antapical bulges.
Holotype: Davies, 1983, pl.4, figs.13-14; Jan du Chêne et al.,1986, pl. 150, fig.19
Locus typicus: Melville Island, District of Franklin, Northwest Territories, Canada
Stratum typicum: Callovian-Oxfordian
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: [Davies, 1983, p. 20]:
Diagnosis:
Proximate dinoflagellate cysts, heart shaped with an elongated, pointed to roundly terminated apical horn and two antapical bulges. Ornament is granulate. Cingulum and tabulation usually not present or poorly defined. Archeopyle: P(3).
Description:
The granulation is more strongly developed at the apex, cingulum and antapex. The granulate elements are globular in shape and less than 1.0 µm (generally less than 0.5 µm) in diameter. A distinct omphalos is present at the cingular-ventral area.
The cingulum is poorly defined, flanked by adcingular lateral bulges. Autophragm is less than 0.5 µm thick and thickened at the apex of the apical horn which is 16-25 µm long. The antapex has two small lateral bulges (5 µm high; 11 µm wide). Tabulation is indistinct or not visible. In the holotype, alignment of granules outlines a dorsal postcingular plate (?3""").
Dimensions:
Size: length - 77(85)90 µm; breadth- 77(68)65 µm.
Affinities:
This species is similar to A. granulatum, but is distinguished by its more distinct apical horn, and the presence of adcingular lateral bulges and two antapical bulges.