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Florentinia deanei
Florentinia deanei (Davey and Williams, 1966) Davey and Verdier, 1973
Originally Hystrichosphaeridium, subsequently (and now) Florentinia.
Holotype: Davey and Williams, 1966, pl.6, figs.4,8
Locus typicus: Fetcham Mill, Surrey, England
Stratum typicum: Cenomanian
Original diagnosis: Davey and Williams, 1966, p. 58: Hystrichosphaeridium deanei
Subspherical to ovoidal central body composed of thin smooth endophragm and smooth or slightly granular periphragm, the latter forming the processes. Tubular processes varying considerably in shape, sub-conical, lagenate or tubiform, open distally with entire or serrate margins. Width of processes extremely variable. Apical archaeopyle usually present.
Dimensions: holotype: diameter of central body 46 by 47 Ám; width of antapical
process 31 Ám, length 35 Ám; length of other processes 15-30 Ám. Number of processes 21. Range: diameter of central body 41-54 Ám, length of processes 15-45 Ám.
Original description: Davey and Williams, 1966, p. 59: Hystrichosphaeridium deanei
The endophragm of the processes may be fibrous, but not strongly so. The processes vary greatly in size and shape, this variation being continuous between extremes of the range. The width of the processes on a specimen may vary from 1.5 to 35 Ám; the length of the processes is, however, more constant. The largest process is usually the antapical, it being sub-conical to lagenate in shape. In one specimen only a few of the larger processes are seen to give rise to two or three parallel branches distally. The processes reflect a tabulation of 4", 6", 6c, 5""", 1p, 1"""" and 2-4s.
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Emended Diagnosis: Davey and Verdier 1973, p. 187: Florentinia deanei
The central body smooth to lightly granular and bears regularly arranged tubular processes, one per reflected plate area. They are thin walled, often slightly striate longitudinally, have relatively broad bases and taper to an open funnel distally. The latter may have an entire or serrate margin. The apical processes are narrowly lagenate; the precingular processes are similar but stouter. The cingulum bears six relatively slender processes. The postcingular region has four, large lagenate processes (2"", 3"", 4"", and 5""); the first postcingular (1""), like the posterior intercalary ( lp), is slender and similar to those on the cingulum. The s u l c a l processes are fine. The antapical process is distinctly the largest, is strongly lagenate, and may be open or apparently closed distally. A combination archaeopyle is usually present (plates 1-4" and 3") although the apical region occasionally remains attached.
Remarks: Davey and Verdier 1973, p. 187
The species has been emended so as to give considerably more detail concerning the position and morphology of the processes and the nature of the archaeopyle. (The morphology of this species was discussed at length by one of us (Davey) with Dr. W. R. Evitt while visiting his laboratory; his assistance and guidance are freely acknowledged).
Reported Occurrence: Middle to Upper Cenomanian, France (Davey, 1969). Middle Cenomanian to Turonian, England (Davey & Williams, 1966b; Clarke & Verdier, 1967; Davey, 1969).
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Remarks: Davey and Verdier 1976, p. 316: Florentinia deanei
Two specimens apparently very similar to F. deanei were recovered from the London Clay (Eocene) by Williams and Downie (1966) and referred to a new species, Hystrichokolpoma unispinum. Although the type material of H. unispinum has not been re-examined its overall morphology, lagenate processes and variable process diameter, appears to be identical to F. deanei and would make the two synonymous. If they are the same species, the two specimens recovered by Williams and Downie were probably reworked from the Cretaceous into the Eocene.
Originally Hystrichosphaeridium, subsequently (and now) Florentinia.
Holotype: Davey and Williams, 1966, pl.6, figs.4,8
Locus typicus: Fetcham Mill, Surrey, England
Stratum typicum: Cenomanian
Original diagnosis: Davey and Williams, 1966, p. 58: Hystrichosphaeridium deanei
Subspherical to ovoidal central body composed of thin smooth endophragm and smooth or slightly granular periphragm, the latter forming the processes. Tubular processes varying considerably in shape, sub-conical, lagenate or tubiform, open distally with entire or serrate margins. Width of processes extremely variable. Apical archaeopyle usually present.
Dimensions: holotype: diameter of central body 46 by 47 Ám; width of antapical
process 31 Ám, length 35 Ám; length of other processes 15-30 Ám. Number of processes 21. Range: diameter of central body 41-54 Ám, length of processes 15-45 Ám.
Original description: Davey and Williams, 1966, p. 59: Hystrichosphaeridium deanei
The endophragm of the processes may be fibrous, but not strongly so. The processes vary greatly in size and shape, this variation being continuous between extremes of the range. The width of the processes on a specimen may vary from 1.5 to 35 Ám; the length of the processes is, however, more constant. The largest process is usually the antapical, it being sub-conical to lagenate in shape. In one specimen only a few of the larger processes are seen to give rise to two or three parallel branches distally. The processes reflect a tabulation of 4", 6", 6c, 5""", 1p, 1"""" and 2-4s.
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Emended Diagnosis: Davey and Verdier 1973, p. 187: Florentinia deanei
The central body smooth to lightly granular and bears regularly arranged tubular processes, one per reflected plate area. They are thin walled, often slightly striate longitudinally, have relatively broad bases and taper to an open funnel distally. The latter may have an entire or serrate margin. The apical processes are narrowly lagenate; the precingular processes are similar but stouter. The cingulum bears six relatively slender processes. The postcingular region has four, large lagenate processes (2"", 3"", 4"", and 5""); the first postcingular (1""), like the posterior intercalary ( lp), is slender and similar to those on the cingulum. The s u l c a l processes are fine. The antapical process is distinctly the largest, is strongly lagenate, and may be open or apparently closed distally. A combination archaeopyle is usually present (plates 1-4" and 3") although the apical region occasionally remains attached.
Remarks: Davey and Verdier 1973, p. 187
The species has been emended so as to give considerably more detail concerning the position and morphology of the processes and the nature of the archaeopyle. (The morphology of this species was discussed at length by one of us (Davey) with Dr. W. R. Evitt while visiting his laboratory; his assistance and guidance are freely acknowledged).
Reported Occurrence: Middle to Upper Cenomanian, France (Davey, 1969). Middle Cenomanian to Turonian, England (Davey & Williams, 1966b; Clarke & Verdier, 1967; Davey, 1969).
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Remarks: Davey and Verdier 1976, p. 316: Florentinia deanei
Two specimens apparently very similar to F. deanei were recovered from the London Clay (Eocene) by Williams and Downie (1966) and referred to a new species, Hystrichokolpoma unispinum. Although the type material of H. unispinum has not been re-examined its overall morphology, lagenate processes and variable process diameter, appears to be identical to F. deanei and would make the two synonymous. If they are the same species, the two specimens recovered by Williams and Downie were probably reworked from the Cretaceous into the Eocene.