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Balcattia
From Fensome et al., 2019:
Balcattia, Cookson and Eisenack, 1974, p.78.
Emendation: Riding, Helby and Stevens in Riding and Helby, 2001g, p.184.
Type: Cookson and Eisenack, 1974, pl.24, fig.8, as Balcattia cirrifera.
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Original description: [Cookson and Eisenack, 1974]: (Translation: Stover and Evitt, 1978, p. 20):
Description:
Shell spherical to ellipsoidal, single walled, provided with indistinct parallel strands at the antapex that are united distally and can be still further connected beneath by thinner branches. It forms kind of a basket-like plexus that is roundly delimited distally. The opening of the shell occurs through the release of an apical calotte. The overall form has, therefore, a longitudinal axis and is polarly differentiated.
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Modified description:
Stover and Evitt, 1978, p. 20:
Description:
- Synopsis: Cysts proximate, elongate longitudinally, composed of an anterior sub-spherical body and a posterior sub-cylindrical structure with a fibrous, is continuous wall; archeopyle apical, Type tA.
- Shape: Longitudinally elongate; outline approximates that of the numeral 8.
- Wall relationships: Autophragm only.
- Wall features: No parasutural features. Anterior body smooth; posterior structure formed of indistinct longitudinal strands joined antapically and loosely interconnected laterally.
- Paratabulation: Essentially lacking except for indications along archeopyle margin; formula unknown.
- Archeopyle: Apical, Type tA; principal archeopyle suture zigzag; operculum free.
- Paracingulum: Not expressed.
- Parasulcus: Not expressed.
- Size: Intermediate.
Affinities:
Balcattia differs from Duosphaeridium in having the wall of the posterior sub- cylindrical structure discontinuous and fibrous. In Duosphaeridium, the wall of the comparable structure is complete and smooth to regulate.
Balcattia, Cookson and Eisenack, 1974, p.78.
Emendation: Riding, Helby and Stevens in Riding and Helby, 2001g, p.184.
Type: Cookson and Eisenack, 1974, pl.24, fig.8, as Balcattia cirrifera.
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Original description: [Cookson and Eisenack, 1974]: (Translation: Stover and Evitt, 1978, p. 20):
Description:
Shell spherical to ellipsoidal, single walled, provided with indistinct parallel strands at the antapex that are united distally and can be still further connected beneath by thinner branches. It forms kind of a basket-like plexus that is roundly delimited distally. The opening of the shell occurs through the release of an apical calotte. The overall form has, therefore, a longitudinal axis and is polarly differentiated.
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Modified description:
Stover and Evitt, 1978, p. 20:
Description:
- Synopsis: Cysts proximate, elongate longitudinally, composed of an anterior sub-spherical body and a posterior sub-cylindrical structure with a fibrous, is continuous wall; archeopyle apical, Type tA.
- Shape: Longitudinally elongate; outline approximates that of the numeral 8.
- Wall relationships: Autophragm only.
- Wall features: No parasutural features. Anterior body smooth; posterior structure formed of indistinct longitudinal strands joined antapically and loosely interconnected laterally.
- Paratabulation: Essentially lacking except for indications along archeopyle margin; formula unknown.
- Archeopyle: Apical, Type tA; principal archeopyle suture zigzag; operculum free.
- Paracingulum: Not expressed.
- Parasulcus: Not expressed.
- Size: Intermediate.
Affinities:
Balcattia differs from Duosphaeridium in having the wall of the posterior sub- cylindrical structure discontinuous and fibrous. In Duosphaeridium, the wall of the comparable structure is complete and smooth to regulate.