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Chytroeisphaeridia reticulata
Chytroeisphaeridia reticulata, Davey, 1969
NOW Batiacasphaera?. Originally Chytroeisphaeridia, subsequently Fromea, thirdly Batiacasphaera, fourthly (and now) Batiacasphaera?.
Holotype: Davey, 1969, pl.4, fig.3
Locus typicus: Northern Natal, South Africa
Stratum typicum: Campanian-Maastrichtian
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Original description: [Davey, 1969, p.14]:
Diagnosis:
An ovoidal to subspherical cyst possessing a thick wall which bears a fine reticulation, rarely granulation. Apical archaeopyle formed by the removal of a subangular to almost circular portion of the test.
Dimensions:
Holotype: test diameter 28 µm by 27 µm.
Range: length (operculum removed 21(28.3)36 µm, width 18(26.5)35 µm. Number of specimens measured, 10.
Description:
The cyst wall is unusually thick (1-1.5 µm) for the size of the test. The surface reticuation of the test wall is very delicate and may only be observed under high power. All specimens possess an archaeopyle, occasionally the operculum remaining in position, which is more or less circular to subangular in shape. Two specimens discovered have a densely granular wall and an angular archaeopyle with splits extending down between the reflected plates.
Affinities:
The thick wall and delicate reticulation differentiate C. reticulata from all previously described species of dinoflagellate cyst. The specimens possessing a granular test wall and a definitely angular archaeopyle may, at a later date, be transferred to a different species.
NOW Batiacasphaera?. Originally Chytroeisphaeridia, subsequently Fromea, thirdly Batiacasphaera, fourthly (and now) Batiacasphaera?.
Holotype: Davey, 1969, pl.4, fig.3
Locus typicus: Northern Natal, South Africa
Stratum typicum: Campanian-Maastrichtian
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: [Davey, 1969, p.14]:
Diagnosis:
An ovoidal to subspherical cyst possessing a thick wall which bears a fine reticulation, rarely granulation. Apical archaeopyle formed by the removal of a subangular to almost circular portion of the test.
Dimensions:
Holotype: test diameter 28 µm by 27 µm.
Range: length (operculum removed 21(28.3)36 µm, width 18(26.5)35 µm. Number of specimens measured, 10.
Description:
The cyst wall is unusually thick (1-1.5 µm) for the size of the test. The surface reticuation of the test wall is very delicate and may only be observed under high power. All specimens possess an archaeopyle, occasionally the operculum remaining in position, which is more or less circular to subangular in shape. Two specimens discovered have a densely granular wall and an angular archaeopyle with splits extending down between the reflected plates.
Affinities:
The thick wall and delicate reticulation differentiate C. reticulata from all previously described species of dinoflagellate cyst. The specimens possessing a granular test wall and a definitely angular archaeopyle may, at a later date, be transferred to a different species.