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Sentusidinium cuculliforme
Sentusidinium ?cuculliforme" Davies, 1983, p.29, pl.10, figs.1–4; text-fig.26.
Holotype: Davies, 1983, pl.10, figs.3–4; Fauconnier and Masure, 2004, pl.69, figs.1–3. Originally Sentusidinium, subsequently Sentusidinium?, thirdly Cyclonephelium. Questionable assignment: Courtinat (1989, p.192). Taxonomic senior synonym: Cleistosphaeridium (now Sentusidinium) separatum, according to Courtinat in Fauconnier and Masure (2004, p.486). Courtinat in Fauconnier and Masure (2004, p.487) simultaneously considered this to be a problematic species of Sentusidinium. Age: Berriasian–Valanginian.
Original description: Davies, 1983, p.29
A species of Sentusidinium having a sphaerical to ovoidal shape; dense covering of sturdy spines which are complexely terminated and reduced or lacking along the cingulum. The accessory sutures are weakly developed between the precingular plates.
Tabulation: only 4", 6"" are evident.
Archaeopyle: (4A)a+6Pa, the ventrally attached operculum is often removed.
Size: length - 48(63)81 µm; breadth - 49(63)77 µm (19 specimens)
Original description: Davies, 1983, p.29
The spines (3(7)16µ) are broadly based, tapering to acuminate, foliate, capitate or acicular terminations. The spines are aligned adcingulary with coalescent bases. Other plate boundaries are also suggested by spine alignment but they are obscured by the spine density and inconsistance in alignment. The cingulum is positioned equatorially, dividing the cyst into two equal halves. Rarely, some precingular plates may be dislocated after archaeopyle formation.
Affinities:
Davies, 1983, p.29: S. echinatum is distinguished from S. cuculliforme by its more regularly spaced, simple spines and the lack of a distinct cingulum. S. pilosum has more widely spaced ornate to capitate spines with no cingulum evident. S. rioultii has similar ornament but more widely spaced, as does S. villerense which has narrower and shorter spines.
Holotype: Davies, 1983, pl.10, figs.3–4; Fauconnier and Masure, 2004, pl.69, figs.1–3. Originally Sentusidinium, subsequently Sentusidinium?, thirdly Cyclonephelium. Questionable assignment: Courtinat (1989, p.192). Taxonomic senior synonym: Cleistosphaeridium (now Sentusidinium) separatum, according to Courtinat in Fauconnier and Masure (2004, p.486). Courtinat in Fauconnier and Masure (2004, p.487) simultaneously considered this to be a problematic species of Sentusidinium. Age: Berriasian–Valanginian.
Original description: Davies, 1983, p.29
A species of Sentusidinium having a sphaerical to ovoidal shape; dense covering of sturdy spines which are complexely terminated and reduced or lacking along the cingulum. The accessory sutures are weakly developed between the precingular plates.
Tabulation: only 4", 6"" are evident.
Archaeopyle: (4A)a+6Pa, the ventrally attached operculum is often removed.
Size: length - 48(63)81 µm; breadth - 49(63)77 µm (19 specimens)
Original description: Davies, 1983, p.29
The spines (3(7)16µ) are broadly based, tapering to acuminate, foliate, capitate or acicular terminations. The spines are aligned adcingulary with coalescent bases. Other plate boundaries are also suggested by spine alignment but they are obscured by the spine density and inconsistance in alignment. The cingulum is positioned equatorially, dividing the cyst into two equal halves. Rarely, some precingular plates may be dislocated after archaeopyle formation.
Affinities:
Davies, 1983, p.29: S. echinatum is distinguished from S. cuculliforme by its more regularly spaced, simple spines and the lack of a distinct cingulum. S. pilosum has more widely spaced ornate to capitate spines with no cingulum evident. S. rioultii has similar ornament but more widely spaced, as does S. villerense which has narrower and shorter spines.