Back
Codoniella
From Williams et al., 2017:
[Codoniella, Cookson and Eisenack, 1961a, p.75; Emendation: Davey, 1979b, p.555. Substitute name for Codonia Cookson and Eisenack, 1960a (an illegitimate name).
Type species: originally as Codonia campanulata, Cookson and Eisenack, 1960a (pl.3, fig.1)] ; Codoniella campanulata, Downie and Sarjeant, 1965; emend. Davey, 1979
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description Codonia: [Cookson and Eisenack, 1960]:
Description:
Shell spherical to oval, with two opposite hollow, equatorial projections open to the exterior, the delicate membrane of which is supported by fibrous loops.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Emended description:
Davey, 1979:
Diagnosis:
The cyst is subspaerical and has an either complete or incomplete paratabulation of the type 2-4`, 6``, 6c, 5```, 0-1p, 1````. The tabulation is marked by parasutural thickenings and sometimes crests in the paracingular, pre- and postcingular regions, although it may be almost lacking here and confined to the apical and antapical regions. Along the parasutural boundaries between the apical and precingular and the antapical and postcingulare paraplates there are developed regular and extremely high crests. The parasutural thickenings extend along this crests and distally continue, just inside the outer limit of these crests. Thus high membranous apical and antapical structures are formed which are open distally and supported by parasutural thickenings. Processes and a periphragm apical horn are absent. Pre-and postcingular crests may be present. The archaeopyle is precingular (3``).
[Codoniella, Cookson and Eisenack, 1961a, p.75; Emendation: Davey, 1979b, p.555. Substitute name for Codonia Cookson and Eisenack, 1960a (an illegitimate name).
Type species: originally as Codonia campanulata, Cookson and Eisenack, 1960a (pl.3, fig.1)] ; Codoniella campanulata, Downie and Sarjeant, 1965; emend. Davey, 1979
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description Codonia: [Cookson and Eisenack, 1960]:
Description:
Shell spherical to oval, with two opposite hollow, equatorial projections open to the exterior, the delicate membrane of which is supported by fibrous loops.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Emended description:
Davey, 1979:
Diagnosis:
The cyst is subspaerical and has an either complete or incomplete paratabulation of the type 2-4`, 6``, 6c, 5```, 0-1p, 1````. The tabulation is marked by parasutural thickenings and sometimes crests in the paracingular, pre- and postcingular regions, although it may be almost lacking here and confined to the apical and antapical regions. Along the parasutural boundaries between the apical and precingular and the antapical and postcingulare paraplates there are developed regular and extremely high crests. The parasutural thickenings extend along this crests and distally continue, just inside the outer limit of these crests. Thus high membranous apical and antapical structures are formed which are open distally and supported by parasutural thickenings. Processes and a periphragm apical horn are absent. Pre-and postcingular crests may be present. The archaeopyle is precingular (3``).