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Komewuia
From Williams et al., 2017:
[Komewuia, Cookson and Eisenack, 1960b, p. 257; Emendations: Dörhöfer and Davies, 1980, p. 30; Chen, 1982, p. 32.
Tax. sr. syn.: Kalyptea, according to Wiggins (1975, p.110) and by implication in Dörhöfer and Davies (1980, p.30), who considered Komewuia to be the senior name — however, Chen (1982, p.32) retained Komewuia.
Type species: Komewuia glabra, Cookson and Eisenack, 1960b (pl.39, fig.8)] ; emend. Chen, 1982
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Original description: [Cookson and Eisenack, 1960]:
Description:
Shell +/- flattened, rounded-rhombic in outline with relatively short apical and antapical horns and without tabulation, girdle or furrows. A pylome is developed.
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Emended description:
Dörhöfer and Davies, 1980:
Description:
Proximate cyst with elongate ovoidal to sphaeroidal outline and an apical and antapical horn. Tabulation occasionally indicated, archaeopyle 2I. Kalyptra present or absent.
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Chen, 1982:
Synopsis:
Cysts biconical with angulation at paracingular area, rounded-rhomboidal, or nearly spherical with single apical and antapical horns; autophragm thin to thick, smooth, granular, reticulate, or irregularly ornamented with features of low relief; paratabulation indicated by Type P, precingular archeopyle.
Description:
Shape: Cyst biconical, rounded rhomboidal, or nearly spherical with single apical and antapical horns; apical horn usually slightly longer, its
apex often showing wartlike extensions (pl. 1, figs. 6, 7); horns varying from extensively to slightly prolonged .
Wall relationships: Autophragm only.
Wall features: Parasutural features absent except sometimes partly indicated at paracingulum; autophragm smooth, with varying thickness, granular, reticulate, or covered with features of low relief evenly distributed over the surface or restricted to both horns.
Paratabulation: Indicated by archeopyle only, presumably gonyaulacacean.
Archeopyle: Precingular Type P (3" only); operculum free, often trapped inside autocyst.
Paracingulum: Generally not indicated, occasionally partly shown by granules aligned on two parallel lines immediately below the archeopyle.
Parasulcus: Generally not indicated.
Size: Intermediate to large, 40-160 µm long.
Affinities:
Komewuia differs from Kalyptea in having a precingular, Type P archeopyle and a definite angulation on both sides at the paracingular area rather than a pareodinioid intercalary Type I (2a only) archeopyle and a smooth curvation at the corresponding area (see text-figs. 1, 2). Diconodinium has a type I (2a only) peridinioid intercalary archeopyle and a much stronger indication of a paracingulum.
[Komewuia, Cookson and Eisenack, 1960b, p. 257; Emendations: Dörhöfer and Davies, 1980, p. 30; Chen, 1982, p. 32.
Tax. sr. syn.: Kalyptea, according to Wiggins (1975, p.110) and by implication in Dörhöfer and Davies (1980, p.30), who considered Komewuia to be the senior name — however, Chen (1982, p.32) retained Komewuia.
Type species: Komewuia glabra, Cookson and Eisenack, 1960b (pl.39, fig.8)] ; emend. Chen, 1982
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: [Cookson and Eisenack, 1960]:
Description:
Shell +/- flattened, rounded-rhombic in outline with relatively short apical and antapical horns and without tabulation, girdle or furrows. A pylome is developed.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Emended description:
Dörhöfer and Davies, 1980:
Description:
Proximate cyst with elongate ovoidal to sphaeroidal outline and an apical and antapical horn. Tabulation occasionally indicated, archaeopyle 2I. Kalyptra present or absent.
----------------------------------------
Chen, 1982:
Synopsis:
Cysts biconical with angulation at paracingular area, rounded-rhomboidal, or nearly spherical with single apical and antapical horns; autophragm thin to thick, smooth, granular, reticulate, or irregularly ornamented with features of low relief; paratabulation indicated by Type P, precingular archeopyle.
Description:
Shape: Cyst biconical, rounded rhomboidal, or nearly spherical with single apical and antapical horns; apical horn usually slightly longer, its
apex often showing wartlike extensions (pl. 1, figs. 6, 7); horns varying from extensively to slightly prolonged .
Wall relationships: Autophragm only.
Wall features: Parasutural features absent except sometimes partly indicated at paracingulum; autophragm smooth, with varying thickness, granular, reticulate, or covered with features of low relief evenly distributed over the surface or restricted to both horns.
Paratabulation: Indicated by archeopyle only, presumably gonyaulacacean.
Archeopyle: Precingular Type P (3" only); operculum free, often trapped inside autocyst.
Paracingulum: Generally not indicated, occasionally partly shown by granules aligned on two parallel lines immediately below the archeopyle.
Parasulcus: Generally not indicated.
Size: Intermediate to large, 40-160 µm long.
Affinities:
Komewuia differs from Kalyptea in having a precingular, Type P archeopyle and a definite angulation on both sides at the paracingular area rather than a pareodinioid intercalary Type I (2a only) archeopyle and a smooth curvation at the corresponding area (see text-figs. 1, 2). Diconodinium has a type I (2a only) peridinioid intercalary archeopyle and a much stronger indication of a paracingulum.