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Polysphaeridium caminuspinum
Polysphaeridium? caminuspinum (Wall, 1965) Riley and Sarjeant, 1972
Now Beaumontella?. Originally Hystrichosphaeridium, subsequently Polysphaeridium? thirdly Dapsilidinium?, fourthly (and now) Beaumontella?. Tax. sr. synonym of Cleistosphaeridium mojsisovicsii Morbey, 1975, according to Below, 1987. At the time of the transfer, Riley and Sarjeant, 1972 questionably included this species in Polysphaeridium.
Holotype: Wall, 1965 pl.9, fig.4
Age: Early Sinemurian
Original description (Wall, 1965)
Holotype: L1/6/2 ShaIes-with-Bee f (bed 74 of Lang, 1923, C.turneri Zone), The Spittles, east of Lyme Regis, Dorset. Diagnosis: Test spherical or weaklv polygonal, thin walled and smooth. Spines hollow, normally equal in length to the test radius, tapering to a narrow distal part with a thickened rim and small aperture. Between 20 and 30 spines are present.
Description: The processes are characterised by their thickened distal extremities which project laterally for 0.5µ. beyond the edges of the spines. Rarely, the tips are divided. The spine bases are relatively wide (2µ, across), and the cavity of the spines is continuous with the cell lumen.
Dimensions: Test diameter 16-20µm, spine length 9-11µm; holotype test 18µm, spines 10µm, (6 specimens measured). Occurrence: Shales-with-Beef (C. turneri Zone), Dorset. Comparisons: Micrhystridium clavatispinum n. sp. is similar in general appearance but has closed, bulbous spine tips.
Now Beaumontella?. Originally Hystrichosphaeridium, subsequently Polysphaeridium? thirdly Dapsilidinium?, fourthly (and now) Beaumontella?. Tax. sr. synonym of Cleistosphaeridium mojsisovicsii Morbey, 1975, according to Below, 1987. At the time of the transfer, Riley and Sarjeant, 1972 questionably included this species in Polysphaeridium.
Holotype: Wall, 1965 pl.9, fig.4
Age: Early Sinemurian
Original description (Wall, 1965)
Holotype: L1/6/2 ShaIes-with-Bee f (bed 74 of Lang, 1923, C.turneri Zone), The Spittles, east of Lyme Regis, Dorset. Diagnosis: Test spherical or weaklv polygonal, thin walled and smooth. Spines hollow, normally equal in length to the test radius, tapering to a narrow distal part with a thickened rim and small aperture. Between 20 and 30 spines are present.
Description: The processes are characterised by their thickened distal extremities which project laterally for 0.5µ. beyond the edges of the spines. Rarely, the tips are divided. The spine bases are relatively wide (2µ, across), and the cavity of the spines is continuous with the cell lumen.
Dimensions: Test diameter 16-20µm, spine length 9-11µm; holotype test 18µm, spines 10µm, (6 specimens measured). Occurrence: Shales-with-Beef (C. turneri Zone), Dorset. Comparisons: Micrhystridium clavatispinum n. sp. is similar in general appearance but has closed, bulbous spine tips.