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Chytroeisphaeridia cariacoensis
Chytroeisphaeridia cariacoensis, Wall, 1967
Harland, 1981, and Lewis, 1984, considered this species to represent the encysted stage of Protoperidinium avellanum (Meunier, 1919) Balech, 1974.
Holotype: Wall, 1967, pl.16, fig.14
Locus typicus: Core A420/18, 10¦ 30.8" N., 64¦ 40" W, Carribbean
Stratum typicum: Quaternary
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Original description: [Wall, 1967, p. 113-114]:
Diagnosis:
A spherical dinoflagellate cyst with a large elongate hexagonal dorsal intercalary archeopyle.
Description:
The test is spherical, often with sharp secondary folds bordering depressions, and penetrated by a hexagonal dorsal, intercalary archeopyle. This is elongated equatorially, its width being almost equal to twice its height, while its size (around 16 x 28 µm) and shape are constant.
Other splits occur in the test but do not reflect a tabulation.
The wall is thin and may enclose an inner capsule with either a minutely thin, hyaline wall or a waxy yellow refractive wall. There are often small, granular inclusions within the cell lumen.
Unmacerated cysts are characteristically brown but they become paler after oxidation.
Affinities:
Chytroeisphaeridia simplicia Wall 1965 differs by having an asymmetrical, hexagonal archeopyle with a length: breadth ratio of 1:1. The natural affinities of both species lie with Peridinium, and the archeopyle represents the loss of a dorsal intercalary plate.
Harland, 1981, and Lewis, 1984, considered this species to represent the encysted stage of Protoperidinium avellanum (Meunier, 1919) Balech, 1974.
Holotype: Wall, 1967, pl.16, fig.14
Locus typicus: Core A420/18, 10¦ 30.8" N., 64¦ 40" W, Carribbean
Stratum typicum: Quaternary
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: [Wall, 1967, p. 113-114]:
Diagnosis:
A spherical dinoflagellate cyst with a large elongate hexagonal dorsal intercalary archeopyle.
Description:
The test is spherical, often with sharp secondary folds bordering depressions, and penetrated by a hexagonal dorsal, intercalary archeopyle. This is elongated equatorially, its width being almost equal to twice its height, while its size (around 16 x 28 µm) and shape are constant.
Other splits occur in the test but do not reflect a tabulation.
The wall is thin and may enclose an inner capsule with either a minutely thin, hyaline wall or a waxy yellow refractive wall. There are often small, granular inclusions within the cell lumen.
Unmacerated cysts are characteristically brown but they become paler after oxidation.
Affinities:
Chytroeisphaeridia simplicia Wall 1965 differs by having an asymmetrical, hexagonal archeopyle with a length: breadth ratio of 1:1. The natural affinities of both species lie with Peridinium, and the archeopyle represents the loss of a dorsal intercalary plate.