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Subtilisphaera inaffecta
Subtilisphaera? inaffecta (Drugg, 1978) Bujak and Davies, 1983
NOW Corculodinium. Originally Geiselodinium, subsequently Subtilisphaera, thirdly Subtilisphaera?, fourthly (and now) Corculodinium. Questionable assignment: Lentin and Williams (1985, p.341).
Taxonomic junior synonym: Geiselodinium paeminosum, according to Courtinat (2000, p.173).
Holotype: Drugg, 1978, pl.3, fig.10
Isotypes: Drugg, 1978
Locus typicus: Kimmeridge Bay, Dorset, England
Stratum typicum: Kimmeridgian
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G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999
Subtilisphaera inaffecta (Drugg, 1978) Bujak and Davies, 1983. This is a cavate cyst with pentagonal to elliptical outline. The endocyst is circular to elliptical in outline. The pericoel is generally restricted except at the apex where the periphragm forms a broad conical horn. Specimens with a pentagonal outline sometimes exhibit a slightly expanded antapical pericoel and occasionally there is a weak development of two low antapical horns. A paracingulum about 6 µm wide is often but no always present. The paracingulum id delineated by low folds or wrinkles developed on the periphragm. Additional folds are often present but there is no suggestion of any true paratabulation. The parasulcus is suggested by a break in the paracingular folds. The endophragm is slightly thicker than the periphragm but both are very thin and smooth to faintly and finely granulate. No archeopyle has been observed. Size: length 49-62 µm, width 42-52 µm. Subtilisphaera paeminosa differs in possessing a pustulate-verrucate ornamentation.
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Original description: Drugg, 1978, p. 68: Geiselodinium inaffectum
Cavate cysts with a pentagonal to elliptical outline. The endocyst is circular to elliptical in outline. The pericoel is generally restricted except at the apex where the periphragm forms a broad conical horn. Specimens with a pentagonal outline sometimes exhibit a slightly expanded antapical pericoel and occasionally there is a weak development of two low antapical horns. A paracingulum about 6 µm wide is often, but not always, present. The paracingulum is delineated by low folds or wrinkles developed on the periphragm. Additional folds are often present but there is no suggestion of any true paratabulation. The parasulcus is suggested by a break in the paracingular folds. The endophragm is slightly thicker than the periphragm but both are very thin and smooth to faintly and finely granulate. No archeopyle has been observed. The length ranges from 49 to 62 µm with most specimens being about 55 µm. The width ranges from 42 to 52 µm.
Poulsen 1996, p. 86
Subtilisphaera? inaffecta (Drugg 1978) Bujak & Davies 1983, Pl. 27, Figs. 1-3 Recorded occurrences. Denmark: Endoscrinium luridum Zone, Perisseiasphaeridium pannosum Subzone - Glossodinium dimorphum Zone, Subzone a. Poland: Rare occurrence in the latest Hypselocyclum Zone, common from mid-Divisum to Autissiodorensis Zones, present in earliest Klimovi Zone.
NOW Corculodinium. Originally Geiselodinium, subsequently Subtilisphaera, thirdly Subtilisphaera?, fourthly (and now) Corculodinium. Questionable assignment: Lentin and Williams (1985, p.341).
Taxonomic junior synonym: Geiselodinium paeminosum, according to Courtinat (2000, p.173).
Holotype: Drugg, 1978, pl.3, fig.10
Isotypes: Drugg, 1978
Locus typicus: Kimmeridge Bay, Dorset, England
Stratum typicum: Kimmeridgian
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G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999
Subtilisphaera inaffecta (Drugg, 1978) Bujak and Davies, 1983. This is a cavate cyst with pentagonal to elliptical outline. The endocyst is circular to elliptical in outline. The pericoel is generally restricted except at the apex where the periphragm forms a broad conical horn. Specimens with a pentagonal outline sometimes exhibit a slightly expanded antapical pericoel and occasionally there is a weak development of two low antapical horns. A paracingulum about 6 µm wide is often but no always present. The paracingulum id delineated by low folds or wrinkles developed on the periphragm. Additional folds are often present but there is no suggestion of any true paratabulation. The parasulcus is suggested by a break in the paracingular folds. The endophragm is slightly thicker than the periphragm but both are very thin and smooth to faintly and finely granulate. No archeopyle has been observed. Size: length 49-62 µm, width 42-52 µm. Subtilisphaera paeminosa differs in possessing a pustulate-verrucate ornamentation.
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Original description: Drugg, 1978, p. 68: Geiselodinium inaffectum
Cavate cysts with a pentagonal to elliptical outline. The endocyst is circular to elliptical in outline. The pericoel is generally restricted except at the apex where the periphragm forms a broad conical horn. Specimens with a pentagonal outline sometimes exhibit a slightly expanded antapical pericoel and occasionally there is a weak development of two low antapical horns. A paracingulum about 6 µm wide is often, but not always, present. The paracingulum is delineated by low folds or wrinkles developed on the periphragm. Additional folds are often present but there is no suggestion of any true paratabulation. The parasulcus is suggested by a break in the paracingular folds. The endophragm is slightly thicker than the periphragm but both are very thin and smooth to faintly and finely granulate. No archeopyle has been observed. The length ranges from 49 to 62 µm with most specimens being about 55 µm. The width ranges from 42 to 52 µm.
Poulsen 1996, p. 86
Subtilisphaera? inaffecta (Drugg 1978) Bujak & Davies 1983, Pl. 27, Figs. 1-3 Recorded occurrences. Denmark: Endoscrinium luridum Zone, Perisseiasphaeridium pannosum Subzone - Glossodinium dimorphum Zone, Subzone a. Poland: Rare occurrence in the latest Hypselocyclum Zone, common from mid-Divisum to Autissiodorensis Zones, present in earliest Klimovi Zone.