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Svalbardella polymorpha
Svalbardella polymorpha Malloy, 1972
NOW Andalusiella. Originally Svalbardella, subsequently Alterbia (combination illegitimate), thirdly (and now) Andalusiella.
Taxonomic junior synonym: Palaeocystodinium microgranulatum, according to Lentin and Williams (1976, p.89);
Taxonomic junior synonym: Senegalinium trisinium, according to Lentin and Williams (1976, p.164);
Taxonomic junior synonym: Andalusiella mauthei, according to Lentin and Williams (1976, p.149) — however, Lentin and Williams (1977b, p.8) retained Andalusiella mauthei; Palaeocystodinium punctatum, according to Lentin and Williams (1976, p.89) — however, Schrank (1987, p.265) retained that taxon as the subspecies Andalusiella polymorpha subsp. punctata.
Holotype: Malloy, 1972, pl.1, fig.15
Locus typicus: Gabon GLA IX well, Gabon Republic, West Africa
Stratum typicum: Maastrichtian
Original diagnosis: Malloy, 1972, p.63
Cyst fusiform, with a thin-walled outer cyst and an inner thicker-walled cyst, periphragm closely appressed to endophragm. The outer cyst displays a single apical horn and two distinct antapical horns. Both lengths and placement of the antapical horns are variable, with separation of the two sometimes equal to their lengths but often only minor. Antapical horns are usually unequal in length, with the shorter 1/2 to 1/3 the length of its neighbor. The short antapical horn, in some cases, may arise from the periphragm (or cyst margin in equatorial view) well away from and above the basal (proximal) contact of the longer antapical. Tips of both apical and antapical horns are either acute or blunted. As described for S . australina (revised), the apical and antapical portions are complex in structure (Text-fig. 2).
The archeopyle is hexagonal, intercalary, and identical to that of S. australina in relative size and outline. All but one specimen examined showed no indications of tabulation. This individual exhihited a pattern of folding involving both periphragm and endophragm, appearently related to tabulation but poorly preserved. No clear indications of a girdle or sulcus are present; however transverse median folding suggests the location of an equatorial structure.
Dimensions: length 90 µm; width 38 µm to 77 µm.
NOW Andalusiella. Originally Svalbardella, subsequently Alterbia (combination illegitimate), thirdly (and now) Andalusiella.
Taxonomic junior synonym: Palaeocystodinium microgranulatum, according to Lentin and Williams (1976, p.89);
Taxonomic junior synonym: Senegalinium trisinium, according to Lentin and Williams (1976, p.164);
Taxonomic junior synonym: Andalusiella mauthei, according to Lentin and Williams (1976, p.149) — however, Lentin and Williams (1977b, p.8) retained Andalusiella mauthei; Palaeocystodinium punctatum, according to Lentin and Williams (1976, p.89) — however, Schrank (1987, p.265) retained that taxon as the subspecies Andalusiella polymorpha subsp. punctata.
Holotype: Malloy, 1972, pl.1, fig.15
Locus typicus: Gabon GLA IX well, Gabon Republic, West Africa
Stratum typicum: Maastrichtian
Original diagnosis: Malloy, 1972, p.63
Cyst fusiform, with a thin-walled outer cyst and an inner thicker-walled cyst, periphragm closely appressed to endophragm. The outer cyst displays a single apical horn and two distinct antapical horns. Both lengths and placement of the antapical horns are variable, with separation of the two sometimes equal to their lengths but often only minor. Antapical horns are usually unequal in length, with the shorter 1/2 to 1/3 the length of its neighbor. The short antapical horn, in some cases, may arise from the periphragm (or cyst margin in equatorial view) well away from and above the basal (proximal) contact of the longer antapical. Tips of both apical and antapical horns are either acute or blunted. As described for S . australina (revised), the apical and antapical portions are complex in structure (Text-fig. 2).
The archeopyle is hexagonal, intercalary, and identical to that of S. australina in relative size and outline. All but one specimen examined showed no indications of tabulation. This individual exhihited a pattern of folding involving both periphragm and endophragm, appearently related to tabulation but poorly preserved. No clear indications of a girdle or sulcus are present; however transverse median folding suggests the location of an equatorial structure.
Dimensions: length 90 µm; width 38 µm to 77 µm.