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Florentinia globosa
From Fensome et al., 2019:
Florentinia globosa Duxbury, 2019, p.192–194, pl.19, fig.11; pl.21, figs.1–6. Holotype: Duxbury, 2019, pl.21, figs.3,5–6. Age: early Aptian.
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Original description Duxbury, 2019:
Plate 19, Figure 11; Plate 21, Figures 1–6
Holotype: Plate 21, Figures 3, 5, 6.
Paratype: Plate 21, Figure 1, 2, 4.
Type Locality: Heslerton No. 2 at 12.20 m (core chip), early Aptian age. Holotype: E.F. T46.0. Paratype E.F. M51.4.
Derivation of Name: From the Latin globosus, round as a ball, spherical – in reference to the main body of this species.
Diagnosis: A smooth, fairly thick walled, chorate cyst with a spheroidal endocyst. Smooth, mesotabular, hollow, distally open and slightly flared processes extend from the cyst surface, where clearly defined, finely granular patches are present below process bases. Tabulation of the formula 4', 6'', 6''', 1p.v., 1'''' is indicated by process distribution and by a precingular archeopyle (3''). Process length increases slightly between the epicyst and hypocyst, but process breadth varies significantly, being least at the apex and greatest in the postcingular area, where processes are typically much broader than that at the antapex. Distal process margins bear short spines or tubules and closure of some process terminations can produce a “club-like” appearance. Processes can display large lateral fenestrations, most typically in the postcingular series.
Dimensions: Holotype: Central body - 53 × 46 μm
Overall: 91 × 81 μm.
All measured specimens: Central body - 66 (53) 46 μm × 58
(48) 41 μm.
Overall: 104 (96) 76 μm × 96 (84) 58 μm.
Specimens Measured: 12.
Remarks: Florentinia globosa n. sp. is large and fairly thick-walled, and it lacks cingular processes, contrasting with Florentinia mantellii (Davey and Williams 1966) Davey and Verdier 1973 and F. striata n. sp. The significant differences in process breadth, particularly between the broad postcingular series and the narrower antapical process are sometimes striking, and set this species apart from Florentinia deanei (Davey and Williams 1966) Davey and Verdier 1973, F. abjuncta Duxbury 1983 and F. interrupta Duxbury 1980. The last two species also display typically “disrupted” processes, except for that at the antapex.
There is some similarity between F. globosa and Florentinia cooksoniae (Singh 1971) Duxbury 1980, but Singh (1983, p. 147) listed several features which set the last species apart, including the lack of secondary tubules, a distinct apical boss and slender cingular and sulcal processes “when present”; the last
Florentinia globosa Duxbury, 2019, p.192–194, pl.19, fig.11; pl.21, figs.1–6. Holotype: Duxbury, 2019, pl.21, figs.3,5–6. Age: early Aptian.
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Original description Duxbury, 2019:
Plate 19, Figure 11; Plate 21, Figures 1–6
Holotype: Plate 21, Figures 3, 5, 6.
Paratype: Plate 21, Figure 1, 2, 4.
Type Locality: Heslerton No. 2 at 12.20 m (core chip), early Aptian age. Holotype: E.F. T46.0. Paratype E.F. M51.4.
Derivation of Name: From the Latin globosus, round as a ball, spherical – in reference to the main body of this species.
Diagnosis: A smooth, fairly thick walled, chorate cyst with a spheroidal endocyst. Smooth, mesotabular, hollow, distally open and slightly flared processes extend from the cyst surface, where clearly defined, finely granular patches are present below process bases. Tabulation of the formula 4', 6'', 6''', 1p.v., 1'''' is indicated by process distribution and by a precingular archeopyle (3''). Process length increases slightly between the epicyst and hypocyst, but process breadth varies significantly, being least at the apex and greatest in the postcingular area, where processes are typically much broader than that at the antapex. Distal process margins bear short spines or tubules and closure of some process terminations can produce a “club-like” appearance. Processes can display large lateral fenestrations, most typically in the postcingular series.
Dimensions: Holotype: Central body - 53 × 46 μm
Overall: 91 × 81 μm.
All measured specimens: Central body - 66 (53) 46 μm × 58
(48) 41 μm.
Overall: 104 (96) 76 μm × 96 (84) 58 μm.
Specimens Measured: 12.
Remarks: Florentinia globosa n. sp. is large and fairly thick-walled, and it lacks cingular processes, contrasting with Florentinia mantellii (Davey and Williams 1966) Davey and Verdier 1973 and F. striata n. sp. The significant differences in process breadth, particularly between the broad postcingular series and the narrower antapical process are sometimes striking, and set this species apart from Florentinia deanei (Davey and Williams 1966) Davey and Verdier 1973, F. abjuncta Duxbury 1983 and F. interrupta Duxbury 1980. The last two species also display typically “disrupted” processes, except for that at the antapex.
There is some similarity between F. globosa and Florentinia cooksoniae (Singh 1971) Duxbury 1980, but Singh (1983, p. 147) listed several features which set the last species apart, including the lack of secondary tubules, a distinct apical boss and slender cingular and sulcal processes “when present”; the last