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Kalyptea diceras
From Fensome et al., 2019:
Kalyptea diceras Cookson and Eisenack, 1960b, p.256–257, pl.39, fig.1. Emendation: Fisher and Riley, 1980, p.323, as Kalyptea diceras. Holotype: Cookson and Eisenack, 1960b, pl.39, fig.1. Originally (and now) Kalyptea, subsequently Komewuia, thirdly Pareodinia. Lentin and Williams (1993, p.366) retained this species in Kalyptea. Taxonomic junior synonym: Kalyptea jurassica, according to Below (1990, p.65). Gocht (1970b, p.154) considered Pareodinia ceratophora to be the questionable taxonomic senior synonym of this species. Age: Tithonian.
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Locus typicus: Canning Basin, W Australia
Stratum typicum: Tithonian
Original description: Cookson and Eisenack, 1960, p. 256
Shell ellipsoidal with apical and antapical horns of unequal length. The apical horn is relatively long, straight or curved, and consists of a short hollow basal region and a longer, and more slender solid apex. The antapical horn is considerably shorter but like the apical horn ends in a solid tip. The membrane of the shell is thin and finely granular; the external membrane in the type specimen is clearly attached to the tip of the apical horn. Dimensions: holotype - shell 152 µm long, 47 µm broad; apical horn 48 µm long, antapical horn about 15 µm. Another example 168x33 µm.
Emended diagnosis: Fisher and Reiley, 1980, p. 323
Cyst elongate to ellipsoidal with apical and antapical horns of unequal length. Cingulum weakly indicated, dividing the cyst unequally, epitract larger than hypotract. Epitract tappering to form a strong, hollow apical horn distally bearing a longer, slender, thread-like apicular structure. No indication of reflected tabulation other than cingular trace and archaeopyle outline. Cyst wall thin, finely granular, type 2I or 3I.
Affinities:
Fisher and Riley, 1980, p. 323: The specimen described by Ioannides et al. 1976 as Netrelytron sp. is similar to K. diceras in size and cyst outline but differs by the possession of an inner body.
Kalyptea diceras Cookson and Eisenack, 1960b, p.256–257, pl.39, fig.1. Emendation: Fisher and Riley, 1980, p.323, as Kalyptea diceras. Holotype: Cookson and Eisenack, 1960b, pl.39, fig.1. Originally (and now) Kalyptea, subsequently Komewuia, thirdly Pareodinia. Lentin and Williams (1993, p.366) retained this species in Kalyptea. Taxonomic junior synonym: Kalyptea jurassica, according to Below (1990, p.65). Gocht (1970b, p.154) considered Pareodinia ceratophora to be the questionable taxonomic senior synonym of this species. Age: Tithonian.
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Locus typicus: Canning Basin, W Australia
Stratum typicum: Tithonian
Original description: Cookson and Eisenack, 1960, p. 256
Shell ellipsoidal with apical and antapical horns of unequal length. The apical horn is relatively long, straight or curved, and consists of a short hollow basal region and a longer, and more slender solid apex. The antapical horn is considerably shorter but like the apical horn ends in a solid tip. The membrane of the shell is thin and finely granular; the external membrane in the type specimen is clearly attached to the tip of the apical horn. Dimensions: holotype - shell 152 µm long, 47 µm broad; apical horn 48 µm long, antapical horn about 15 µm. Another example 168x33 µm.
Emended diagnosis: Fisher and Reiley, 1980, p. 323
Cyst elongate to ellipsoidal with apical and antapical horns of unequal length. Cingulum weakly indicated, dividing the cyst unequally, epitract larger than hypotract. Epitract tappering to form a strong, hollow apical horn distally bearing a longer, slender, thread-like apicular structure. No indication of reflected tabulation other than cingular trace and archaeopyle outline. Cyst wall thin, finely granular, type 2I or 3I.
Affinities:
Fisher and Riley, 1980, p. 323: The specimen described by Ioannides et al. 1976 as Netrelytron sp. is similar to K. diceras in size and cyst outline but differs by the possession of an inner body.