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Dapsilidinium simplex
From Fensome et al., 2019:
Dapsilidinium simplex (White, 1842, p.38, pl.4, fig.10) Bujak et al., 1980, p.28. Holotype: White, 1842, pl.4, fig.10. Originally Xanthidium tubiferum var. simplex (Appendix A), subsequently Xanthidium simplex (Appendix A), thirdly Hystrichosphaeridium simplex, fourthly Polysphaeridium? simplex, fifthly (and now) Dapsilidinium simplex. Questionable assignment: Stover and Williams (1987, p.70). Age: Late Cretaceous.
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Original description: [White, 1842, p. 82]:
The first of these three Tubifera or tube-bearing Xanthidia, I call Xanthidium tubifrum simplex; or, leaving out the generic name, Tubiferum simplex ; because the tubiform tentacula have a simple termination, that being of a plain circular orifice, slightly curving outwards, like the end of a trumpet or hautboy, perhaps not unlike the mouth of a leech when fixed, and in the act of drawing blood. This I have found by far the most rare species, having discovered only two or three during my researches, among thousands of the remaining species. They have, as nearly as I can count, about fifteen tentacula apparent, and they measure about & of an inch in diameter. These Tubifera, from their peculiar structure and substantial appearance, more than any of the other species, clearly prove that the animalcule is spherical, and armed, in all parts of the body, with tentacula.
Dapsilidinium simplex (White, 1842, p.38, pl.4, fig.10) Bujak et al., 1980, p.28. Holotype: White, 1842, pl.4, fig.10. Originally Xanthidium tubiferum var. simplex (Appendix A), subsequently Xanthidium simplex (Appendix A), thirdly Hystrichosphaeridium simplex, fourthly Polysphaeridium? simplex, fifthly (and now) Dapsilidinium simplex. Questionable assignment: Stover and Williams (1987, p.70). Age: Late Cretaceous.
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Original description: [White, 1842, p. 82]:
The first of these three Tubifera or tube-bearing Xanthidia, I call Xanthidium tubifrum simplex; or, leaving out the generic name, Tubiferum simplex ; because the tubiform tentacula have a simple termination, that being of a plain circular orifice, slightly curving outwards, like the end of a trumpet or hautboy, perhaps not unlike the mouth of a leech when fixed, and in the act of drawing blood. This I have found by far the most rare species, having discovered only two or three during my researches, among thousands of the remaining species. They have, as nearly as I can count, about fifteen tentacula apparent, and they measure about & of an inch in diameter. These Tubifera, from their peculiar structure and substantial appearance, more than any of the other species, clearly prove that the animalcule is spherical, and armed, in all parts of the body, with tentacula.