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Beaumontella delicata
From Fensome et al., 2019:
Beaumontella? delicata (Wall, 1965a, p.156, pl.1, figs.11–13; pl.7, fig.6) Below, 1987a, p.70. Holotype: Wall, 1965a, pl.1, fig.11.
Originally Baltisphaeridium (Appendix A), subsequently Solisphaeridium (combination not validly published,
Appendix A), thirdly (and now) Beaumontella?. Questionable assignment: Below (1987a, p.70). Age: Hettangian–
early Sinemurian.
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Original description as Baltisphaeridium delicatum: [Wall, 1965]:
Diagnosis:
An acritarch species with a delicate, ovoid to globular test bearing 20 to 40 simple, hollow spines of medium length.
Description:
The test wall is very thin and easily folded. Its spines are hollow, mostly straight, and taper from bases 2 to 3 a wide to minutely rounded tips, which may be solid. Individual spines vary between one-fifth and one-half of the maximum test dimension in length. Occasionally the test is broken at one end; this is not a constant feature but is due to the delicate nature of the test wall.
Dimensions:
Test only, 16 X 15 µm to 24 X 17 µm; spines 2.5 to 9 µm: holotype 24 X 16 µm, spines 4 µm. (twenty-five specimens).
Affinities:
This species closely resembles Baltisphaeridium brevispinosum Eisenack var. wenlockensts Downie , 1959, p. 59, from the Silurian Wenlock Shale in England. I n addition to their considerably different geological ages, the Liassic species differs in its delicate test and some times blunt spine tips.
Beaumontella? delicata (Wall, 1965a, p.156, pl.1, figs.11–13; pl.7, fig.6) Below, 1987a, p.70. Holotype: Wall, 1965a, pl.1, fig.11.
Originally Baltisphaeridium (Appendix A), subsequently Solisphaeridium (combination not validly published,
Appendix A), thirdly (and now) Beaumontella?. Questionable assignment: Below (1987a, p.70). Age: Hettangian–
early Sinemurian.
---------------------------------------------------------------------------------------------------
Original description as Baltisphaeridium delicatum: [Wall, 1965]:
Diagnosis:
An acritarch species with a delicate, ovoid to globular test bearing 20 to 40 simple, hollow spines of medium length.
Description:
The test wall is very thin and easily folded. Its spines are hollow, mostly straight, and taper from bases 2 to 3 a wide to minutely rounded tips, which may be solid. Individual spines vary between one-fifth and one-half of the maximum test dimension in length. Occasionally the test is broken at one end; this is not a constant feature but is due to the delicate nature of the test wall.
Dimensions:
Test only, 16 X 15 µm to 24 X 17 µm; spines 2.5 to 9 µm: holotype 24 X 16 µm, spines 4 µm. (twenty-five specimens).
Affinities:
This species closely resembles Baltisphaeridium brevispinosum Eisenack var. wenlockensts Downie , 1959, p. 59, from the Silurian Wenlock Shale in England. I n addition to their considerably different geological ages, the Liassic species differs in its delicate test and some times blunt spine tips.