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Cassidium fragile
Cassidium fragilis, (Harris, 1965), Drugg, 1967
Originally Ovoidites (a pollen genus), subsequently (and now) Cassidium.
Holotype: Harris, 1965, pl.27, fig.5
Locus typicus: Princetown, Victoria, Australia
Stratum typicum: Early Eocene
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Original description as Ovoidites fragilis: [Harris, 1965, p.97]:
Description:
Pollen non-aperturate, exine 2-3 µm thick coarsely rugulate. Rugulae 1 µm high 2 µm wide at base often anastomosing to give a reticulate pattern. Pollen commonly fractured.
Dimensions:
Diameter (10 specimens) 60 (75) 79 µm.
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Revised diagnosis:
Drugg, 1967, p. 22:
Diagnosis:
Test circular to slightly angular in outline, usually dorso-ventrally flattened by compression. Weakly developed antapical lobes sometimes present. No girdle or longitudinal furrow visible. Test wall relatively thick- ca. 2 to 3 µm. Outer surface rugulate to imperfectly reticulate, the rugulae being low, thick, and rounded.
The test opens by means of an apical archeopyle, the line of separation being characteristically zigzag.
The test is tabulated but the exact formula is questionable because the peculiar ornamentation tends to obscure the plate boundaries. The tabulation appears to consist of six large equatorial plates below the archeopyle and one large antapical plate. The operculum questionably consists of four plates.
Dimensions:
The size varies from 60 to 92 µm high, and 61 to 97 µm wide.
Originally Ovoidites (a pollen genus), subsequently (and now) Cassidium.
Holotype: Harris, 1965, pl.27, fig.5
Locus typicus: Princetown, Victoria, Australia
Stratum typicum: Early Eocene
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description as Ovoidites fragilis: [Harris, 1965, p.97]:
Description:
Pollen non-aperturate, exine 2-3 µm thick coarsely rugulate. Rugulae 1 µm high 2 µm wide at base often anastomosing to give a reticulate pattern. Pollen commonly fractured.
Dimensions:
Diameter (10 specimens) 60 (75) 79 µm.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Revised diagnosis:
Drugg, 1967, p. 22:
Diagnosis:
Test circular to slightly angular in outline, usually dorso-ventrally flattened by compression. Weakly developed antapical lobes sometimes present. No girdle or longitudinal furrow visible. Test wall relatively thick- ca. 2 to 3 µm. Outer surface rugulate to imperfectly reticulate, the rugulae being low, thick, and rounded.
The test opens by means of an apical archeopyle, the line of separation being characteristically zigzag.
The test is tabulated but the exact formula is questionable because the peculiar ornamentation tends to obscure the plate boundaries. The tabulation appears to consist of six large equatorial plates below the archeopyle and one large antapical plate. The operculum questionably consists of four plates.
Dimensions:
The size varies from 60 to 92 µm high, and 61 to 97 µm wide.