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Beaumontella caminuspina
Beaumontella? caminuspina, (Wall, 1965), Below, 1987
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, Below, 1987, questionably included this species in Beaumontella.
Holotype: Wall, 1965, pl.9, fig.3
Locus typicus: Shales-with-Beef, Dorset, England
Stratum typicum: Early Sinemurian
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Original description as Hystrichosphaeridium caminuspinum: [Wall, 1965, p. 165]:
Diagnosis:
Test spherical or weakly 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 characterized by their thickened distal extremities which project laterally for 0.5 µm beyond the edges of the spines. Rarely, the tips are divided. The spine bases are relatively wide (2 µm across), and the cavity of the spines is continuously with the cell lumen.
Dimensions:
Test diameter 16-20 µm, spine length 9-11 µm; holotype test 18 µm, spines 10 µm (6 specimens measured).
Affinities:
Micrhystridium clavatispinum is similar in general appearance but has closed, bulbous spine tips.
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Notes:
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Beaumontella caminuspina, (Wall, 1965a) Below, 1987a. According to Wall (1965), has a spherical or weakly polygonal test, thin walled and smooth. The spines are hollow, normally equal in length to the test radius, tapering to a narrow distal part with a thickened rim and small aperture. Number of spines between 20 and 30. The processes are characterised by their thickened distal extremities which project laterally for 0.5 µm beyond the edge of the spines. The spine bases are relatively wide, ca 2 µm.
Size: test diameter 16-20 µm, spines 9-11 µm.
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, Below, 1987, questionably included this species in Beaumontella.
Holotype: Wall, 1965, pl.9, fig.3
Locus typicus: Shales-with-Beef, Dorset, England
Stratum typicum: Early Sinemurian
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description as Hystrichosphaeridium caminuspinum: [Wall, 1965, p. 165]:
Diagnosis:
Test spherical or weakly 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 characterized by their thickened distal extremities which project laterally for 0.5 µm beyond the edges of the spines. Rarely, the tips are divided. The spine bases are relatively wide (2 µm across), and the cavity of the spines is continuously with the cell lumen.
Dimensions:
Test diameter 16-20 µm, spine length 9-11 µm; holotype test 18 µm, spines 10 µm (6 specimens measured).
Affinities:
Micrhystridium clavatispinum is similar in general appearance but has closed, bulbous spine tips.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Notes:
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Beaumontella caminuspina, (Wall, 1965a) Below, 1987a. According to Wall (1965), has a spherical or weakly polygonal test, thin walled and smooth. The spines are hollow, normally equal in length to the test radius, tapering to a narrow distal part with a thickened rim and small aperture. Number of spines between 20 and 30. The processes are characterised by their thickened distal extremities which project laterally for 0.5 µm beyond the edge of the spines. The spine bases are relatively wide, ca 2 µm.
Size: test diameter 16-20 µm, spines 9-11 µm.