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Subtilisphaera asymmetrica
Subtilisphaera asymmetrica (Davey and Verdier, 1971) Lentin and Williams, 1976
Name illegitimate: nomenclatural senior synonym: Deflandrea (now Subtilisphaera) deformans, which has the same type.
NOW Subtilisphaera deformans. Originally Deflandrea asymmetrica (name illegitimate), subsequently Deflandrea deformans, thirdly Deflandrea daveyi (name illegitimate), fourthly Subtilisphaera asymmetrica (name illegitimate), fifthly (and now) Subtilisphaera deformans.
Holotype: Davey and Verdier, 1971, pl.2, fig.6
Age: Middle Albian
Original description (Davey and Verdier, 1971)
Thin walled cyst with spherical to ovoidal inner body and loosely fitting, smooth to lightly granular outer membrane. Inner body asymmetrically placed within the outer membrane, which is produced into a large apical horn and typically one antapical horn. Cingulum always present, represented by low ridges. Archaeopyle not visible.
Holotype: Slide 70/12, Côtes Noires de Moeslains, middle Albian, France.
Paratype: Slide 67/1 Côtes Noires de Moeslains, Middle Albian, France.
Dimensions: Overall length holotype: 58 µm; paratype 71 µm; Range 58 (71.4)80 µm
Overall width holotype: 43 µm; paratype: 40 µm; Range 40 (46.2)61 µm
Description: The inner body is typically attached laterally to one side of the outer membrane, the other side remaining free. The cyst has an asymmetrical appearance since the inner body is not located centrally. The apical horn is a broad prolongation of the outer membrane is similarly detached from the inner body and forms one, asymmetrically placed, subconical horn. This species is relatively thin walled and the type material does not stain with safranin.
Remarks: D. assymmetrica may be compared with the genus Dingodinium Cookson & Eisenack 1958. The latter, however, does not possess an antapical horn and the apical horn is typically longer. It may be distinguished from Deflandrea pirnaensis Alberti 1959 by the displaced position of the inner body and the broad apical horn.
Name illegitimate: nomenclatural senior synonym: Deflandrea (now Subtilisphaera) deformans, which has the same type.
NOW Subtilisphaera deformans. Originally Deflandrea asymmetrica (name illegitimate), subsequently Deflandrea deformans, thirdly Deflandrea daveyi (name illegitimate), fourthly Subtilisphaera asymmetrica (name illegitimate), fifthly (and now) Subtilisphaera deformans.
Holotype: Davey and Verdier, 1971, pl.2, fig.6
Age: Middle Albian
Original description (Davey and Verdier, 1971)
Thin walled cyst with spherical to ovoidal inner body and loosely fitting, smooth to lightly granular outer membrane. Inner body asymmetrically placed within the outer membrane, which is produced into a large apical horn and typically one antapical horn. Cingulum always present, represented by low ridges. Archaeopyle not visible.
Holotype: Slide 70/12, Côtes Noires de Moeslains, middle Albian, France.
Paratype: Slide 67/1 Côtes Noires de Moeslains, Middle Albian, France.
Dimensions: Overall length holotype: 58 µm; paratype 71 µm; Range 58 (71.4)80 µm
Overall width holotype: 43 µm; paratype: 40 µm; Range 40 (46.2)61 µm
Description: The inner body is typically attached laterally to one side of the outer membrane, the other side remaining free. The cyst has an asymmetrical appearance since the inner body is not located centrally. The apical horn is a broad prolongation of the outer membrane is similarly detached from the inner body and forms one, asymmetrically placed, subconical horn. This species is relatively thin walled and the type material does not stain with safranin.
Remarks: D. assymmetrica may be compared with the genus Dingodinium Cookson & Eisenack 1958. The latter, however, does not possess an antapical horn and the apical horn is typically longer. It may be distinguished from Deflandrea pirnaensis Alberti 1959 by the displaced position of the inner body and the broad apical horn.