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Sentusidinium capillatum
Sentusidinium capillatum (Davey, 1975) Lentin and Williams, 1981
Originally Tenua Eisenack, subsequently Sentusidinium, thirdly (and now) Pilosidinium.
Holotype: Davey, 1975, pl.2, fig.7
Locus typicus: Ghana
Stratum typicum: Senonian (probably Campanian)
Original diagnosis: Davey, 1975, p.155: Tenua capillata
The cyst is subspherical in outline and is covered by numerous hair-like intratabular spines. m e cyst wall is of moderate thickness and is smooth. m e spines are solid, relatively flexuous and taper distally; their distal termination is pointed or slightly truncated. The angular apical archaeopyle is rarely obvious since the operculum usually remains attached. When the operculum is detached sutural breakages occur between the precingular plates.
Dimensions.Holotype Paratype Range
Diameter of central body 63x61 µm 54x47 µm 46(57)63 µm
Length of spines 2-4 µm 5-9 µm 2-9 µm
Original description: Davey, 1975, p.156: Tenua capillata
A slight thickening of the cyst wall at the base of each spine gives the cyst surface a tuberculated appearance. Spine alignment and apical/antapical structures are absent.
Affinities:
Davey, 1975, p.156: Tenua capillata
The Lower Cretaceous (Eisenack 1958) and the Jurassic (Sarjeant 1968) species of this genus differ from T. capillata by the possession of stouter, more complex spines.
Originally Tenua Eisenack, subsequently Sentusidinium, thirdly (and now) Pilosidinium.
Holotype: Davey, 1975, pl.2, fig.7
Locus typicus: Ghana
Stratum typicum: Senonian (probably Campanian)
Original diagnosis: Davey, 1975, p.155: Tenua capillata
The cyst is subspherical in outline and is covered by numerous hair-like intratabular spines. m e cyst wall is of moderate thickness and is smooth. m e spines are solid, relatively flexuous and taper distally; their distal termination is pointed or slightly truncated. The angular apical archaeopyle is rarely obvious since the operculum usually remains attached. When the operculum is detached sutural breakages occur between the precingular plates.
Dimensions.Holotype Paratype Range
Diameter of central body 63x61 µm 54x47 µm 46(57)63 µm
Length of spines 2-4 µm 5-9 µm 2-9 µm
Original description: Davey, 1975, p.156: Tenua capillata
A slight thickening of the cyst wall at the base of each spine gives the cyst surface a tuberculated appearance. Spine alignment and apical/antapical structures are absent.
Affinities:
Davey, 1975, p.156: Tenua capillata
The Lower Cretaceous (Eisenack 1958) and the Jurassic (Sarjeant 1968) species of this genus differ from T. capillata by the possession of stouter, more complex spines.