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Tuberculodinium vancampoae
Tuberculodinium vancampoae (Rossignol, 1962) Wall, 1967
Originally Pterospermopsis? (an acritarch genus), subsequently (and now) Tuberculodinium, thirdly Pyrophacus. Head (1996b, p.1232) retained this species in Tuberculodinium.
Taxonomic junior synonym: Membranilarnacia donaensis, according to Jain and Garg (1990, p.108).
Motile equivalent: Pyrophacus steinii (Schiller, 1935) Wall and Dale, 1971, according to Matsuoka et al. (1989, p.94).
Holotype: Rossignol, 1962, pl.2, fig.1
Age: Pleistocene
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G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Tuberculodinium vancampoae (Rossignol, 1962) Wall, 1967. Description from Wall (1967), the test is discoidal with two cell wall layers, the outer separated from the inner by numerous short, stout, hollow, tuberculate processes. These are circular in surface view, bu in lateral views their shapes vary from spherical to figure-of-eight shaped while the distal extremity of a process may flare and merge with the outer wall layer. The archeopyle is large and polyhedral: it has one long straight side and about eight shorter sides roughly arranged about an arc. It probably represents both dorsal precingular and intercalary plates, in which case the whole test is flattened dorsoventrally. There are sometimes weak traces of a girdle, sulcus, and a slight posteroventral sulcal depression on the surface opposite to the archeopyle opening, which support this interpretation. Overall variations observed in the structure of this species include loss or partial detachment of the outer layer and the presence of an inner capsule with a refractive yellowish wall. Matsuoka et al. (1998) believe the archeopyle of this species to be neither hypocystal nor precingular but epicystal. They form on the apical side where they are topologically related to the distribution of large and barrel-shaped processes. This is the cyst of Pyrophacus steinii. Size: overall 62-113 µm.
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Supplemental description: Wall, 1967, p.114
The test is dicoidal with two cell wall layers, the outer separated from the inner by numerous short, stout, hollow, tuberculate processes. These are circular in surface view, but in lateral views their shapes vary from sphaerical to figure-of-eight shaped while the distal extremity of a process may flare and merge with the outer layer. The archaeopyle is large and polyhedral; it has one long straight side and approximately eight shorter sides roughly arranged about an arc. It probably represents both dorsal precingular and intercalary plates, in which case the whole test is flattened dorso-ventrally. There are sometimes weak traces of a girdle, longitudinal furrow, and a slight posteroventral sulcal depresssion on the surface opposite to the archaeopyle opening, which support this interpretation. Over-all variations observed in the structure of this species include loss or partial detachment of the outer layer and the presence of an inner capsule with a refractive, yellowish wall.
Dimensions: Over-all size from 62 to 113 µm, maximum dimensions.
Originally Pterospermopsis? (an acritarch genus), subsequently (and now) Tuberculodinium, thirdly Pyrophacus. Head (1996b, p.1232) retained this species in Tuberculodinium.
Taxonomic junior synonym: Membranilarnacia donaensis, according to Jain and Garg (1990, p.108).
Motile equivalent: Pyrophacus steinii (Schiller, 1935) Wall and Dale, 1971, according to Matsuoka et al. (1989, p.94).
Holotype: Rossignol, 1962, pl.2, fig.1
Age: Pleistocene
--------------------------------------------------
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Tuberculodinium vancampoae (Rossignol, 1962) Wall, 1967. Description from Wall (1967), the test is discoidal with two cell wall layers, the outer separated from the inner by numerous short, stout, hollow, tuberculate processes. These are circular in surface view, bu in lateral views their shapes vary from spherical to figure-of-eight shaped while the distal extremity of a process may flare and merge with the outer wall layer. The archeopyle is large and polyhedral: it has one long straight side and about eight shorter sides roughly arranged about an arc. It probably represents both dorsal precingular and intercalary plates, in which case the whole test is flattened dorsoventrally. There are sometimes weak traces of a girdle, sulcus, and a slight posteroventral sulcal depression on the surface opposite to the archeopyle opening, which support this interpretation. Overall variations observed in the structure of this species include loss or partial detachment of the outer layer and the presence of an inner capsule with a refractive yellowish wall. Matsuoka et al. (1998) believe the archeopyle of this species to be neither hypocystal nor precingular but epicystal. They form on the apical side where they are topologically related to the distribution of large and barrel-shaped processes. This is the cyst of Pyrophacus steinii. Size: overall 62-113 µm.
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Supplemental description: Wall, 1967, p.114
The test is dicoidal with two cell wall layers, the outer separated from the inner by numerous short, stout, hollow, tuberculate processes. These are circular in surface view, but in lateral views their shapes vary from sphaerical to figure-of-eight shaped while the distal extremity of a process may flare and merge with the outer layer. The archaeopyle is large and polyhedral; it has one long straight side and approximately eight shorter sides roughly arranged about an arc. It probably represents both dorsal precingular and intercalary plates, in which case the whole test is flattened dorso-ventrally. There are sometimes weak traces of a girdle, longitudinal furrow, and a slight posteroventral sulcal depresssion on the surface opposite to the archaeopyle opening, which support this interpretation. Over-all variations observed in the structure of this species include loss or partial detachment of the outer layer and the presence of an inner capsule with a refractive, yellowish wall.
Dimensions: Over-all size from 62 to 113 µm, maximum dimensions.