Archaeomonas manginii Deflandre, 1932c
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publication ID |
https://doi.org/10.4202/app.01218.2024 |
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persistent identifier |
https://treatment.plazi.org/id/390C4800-5513-BF15-FF7C-B6C8AAF6FEDC |
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treatment provided by |
Felipe |
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scientific name |
Archaeomonas manginii Deflandre, 1932c |
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Archaeomonas manginii Deflandre, 1932c
Figs. 6H, I, J, K View Fig , 7A View Fig .
Material.—Numerous specimens encountered on each SEM stub from Borek Nowy 6, Kawalec (DMF stub 349-2f), Brzezówka 32, Futoma 4 (DMF stubs 349-16a, 349-17c, 349-17d), 5, 14, 17, 21, Łubno 4 (DMF stub 342-13 as B 40 0046308), Oligocene of southeastern Poland.
Description.—Stomatocysts spherical or subspherical, 3.3– 9.0 µm in diameter. Pores regular, 0.5–0.9 µm in diameter ( Fig. 6H, J View Fig ). Collar cylindrical, low, with smooth to irregular margin, 1.0–2.5 µm in diameter, up to 0.8 µm high ( Fig. 6I View Fig 1 View Fig , K). Conulae or stout spines irregularly dispersed over cyst surface, less dense or absent near collar ( Fig. 6I View Fig 2, J). Spines up to 1.0 µm long and 0.9–3.1 µm apart, or 3–11 in 10 µm, most commonly 5–6 conulae/spines in 10 µm.
Several slightly different specimens called A. manginii variant 1 ( Figs. 6K View Fig , 7A View Fig ), have a collar with several conulae. Their cell, pore, collar size, conulae and density overlap with typical variant described above (cell diameter 6.0– 9.4 µm, pores 0.6–0.7 µm, collar up to 0.7 µm high and 2.5 µm in diameter). These cysts also covered with spines, 5–9 spines in 10 µm. Spines fairly regularly dispersed with tendency to arrange into rows.
Remarks.—The size range of our specimens extends below that given in previous reports (6–10 µm) but meets other diagnostic criteria. Anterior pole spines and collar morphology shown on SEM images of the species in Deflandre and Deflandre-Rigaud (1969) and Stradner (1971) are also similar to our specimens. The presence of the narrow spineless area surrounding the collar is shown on the illustration of the holotype, but not on all specimens subsequently attributed to this species. Our specimens of A. manginii differ from A. anterioconica Kaczmarska sp. nov. by the rounded shoulders surrounding collar, spherical cyst outline, and low rim-like cylindrical collar. Freshwater Stomatocyst 31 Duff & Smol, 1989, illustrated in Duff et al. (1995) and Stomatocyst 157 Zeeb & Smol, 1993, show either similar spines, collar, or cell size, but in contrast to A. manginii and our specimens, the spines are equidistantly distributed on those cysts. Archaeomonas manginii is a relatively frequently reported species from sediments around the world.
Stratigraphic and geographic range.—Upper Cretaceous of the Moreno Formation, California ( USA; Rampi 1940; Cornell 1972), Upper Cretaceous of the Subantarctic Southwest Pacific ( Perch-Nielsen 1975), Eocene of the Kreyenhagen Formation, California ( USA; Rampi 1969), Rupelian (lower Oligocene) of southeastern Poland (this study), Miocene of the Calvert Formation, Maryland ( USA; Tynan 1960; Deflandre 1932a), Miocene of Noto Peninsula ( Japan; Bachmann 1964), Miocene of Limberg ( Austria; Stradner 1971), and Tortonian (Miocene) of Hungary ( Hajós 1968).
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