Davey, 1968
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Davey, R.J., 1968: Gonyaulacysta parorthoceras, a new species of dinoflagellate cyst. Palaeontologia Africana, v.11, p.1.
Davey, R.J., 1968: Gonyaulacysta parorthoceras, a new species of dinoflagellate cyst. Palaeontologia Africana, v.11, p.1.