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Spiniferites scabrosus
Spiniferites scabrosus (Clarke and Verdier, 1967) Lentin and Williams, 1975
Originally Hystrichosphaer, subsequently (and now) Spiniferites.
Harker and Sarjeant, 1975, also transferred this species to Spiniferites.
Holotype: Clarke and Verdier, 1967, pl.9, fig.10
Locus typicus: Isle of Wight, Southern Cliff, England
Stratum typicum: Cenomanian-Santonian
Original diagnosis: Clarke and Verdier, 1967, p.49: Hystrichosphaera scabrosa
A species of Hystrichosphaera with scabrae on the ledges and processes; the plates are generally rugulate.
Original description: Clarke and Verdier, 1967, p.49: Hystrichosphaera scabrosa
Body more or less circular, wall 1-2 µm thick. Processes arise from the junction of the plates. These are long, up to half the body diameter in length, of varying width and which bifurcate or trifurcate at their distal extremity; there may be more than one branching. The very wide angle of the bifurcations shows similarity with that observed in Achomosphaera ramulifera Evitt, 1963. The processes are joined by low ledges outlining the girdle and the plate system. The sculpture on the plates consists of a fine rugulation while the ledges and especially the processes possess irregularly spaced scabrae. The precingular archaeopyle is sometimes visible.
Dimensions: Holotype: Body diameter 44 µm, length of processes 16 µm. Range: Body diameter 42-48 µm, length of processes 16-24 µm.
Affinities:
Clarke and Verdier, 1967, p.49: Hystrichosphaera scabrosa
H. scabrosa differs from H. cingulata Deflandre and Cookson, 1955 in the presence of processes which project above the top of the ledges, and from H. crassipellis Deflandre and Cookson, 1955 in the presence of scabrae on the ledges and processes.
Originally Hystrichosphaer, subsequently (and now) Spiniferites.
Harker and Sarjeant, 1975, also transferred this species to Spiniferites.
Holotype: Clarke and Verdier, 1967, pl.9, fig.10
Locus typicus: Isle of Wight, Southern Cliff, England
Stratum typicum: Cenomanian-Santonian
Original diagnosis: Clarke and Verdier, 1967, p.49: Hystrichosphaera scabrosa
A species of Hystrichosphaera with scabrae on the ledges and processes; the plates are generally rugulate.
Original description: Clarke and Verdier, 1967, p.49: Hystrichosphaera scabrosa
Body more or less circular, wall 1-2 µm thick. Processes arise from the junction of the plates. These are long, up to half the body diameter in length, of varying width and which bifurcate or trifurcate at their distal extremity; there may be more than one branching. The very wide angle of the bifurcations shows similarity with that observed in Achomosphaera ramulifera Evitt, 1963. The processes are joined by low ledges outlining the girdle and the plate system. The sculpture on the plates consists of a fine rugulation while the ledges and especially the processes possess irregularly spaced scabrae. The precingular archaeopyle is sometimes visible.
Dimensions: Holotype: Body diameter 44 µm, length of processes 16 µm. Range: Body diameter 42-48 µm, length of processes 16-24 µm.
Affinities:
Clarke and Verdier, 1967, p.49: Hystrichosphaera scabrosa
H. scabrosa differs from H. cingulata Deflandre and Cookson, 1955 in the presence of processes which project above the top of the ledges, and from H. crassipellis Deflandre and Cookson, 1955 in the presence of scabrae on the ledges and processes.