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Paleogene dinoflagellate cysts from the Liaohe Depression, northeast China
| Sun Xuekun | |
| 1994 | |
| Palynology 18: 67-87 | |
| Paleogene dinoflagellate cysts from the Liaohe Depression, northeast China |
Sun Xuekun, 1994; Paleogene dinoflagellate cysts from the Liaohe Depression, northeast China. Palynology 18: 67-87 Eocene dinoflagellate cysts from five exploration wells in the Liaohe Depression, northeast China, have been examined with particular emphasis regarding their morphology and taxonomy. Sixteen genera and 29 species of fossil dinoflagellates, including one new genus, Songiella, and two new species, Bohaidina tuberculata and Protoellipsodinium minutus, are described and illustrated. Songiella gen. nov. is proposed herein to include those dinoflagellate cysts which were originally described as Bipolaribucina huanghuaensis (Song et al., 1978). Four peculiar proximatecystgenera- Bohaidina,Parabohaidina, Conicoidium and Prominangularia - are discussed and emended on the basis of archeopyle morphology and overall shape. The emendation of Bohaidina suggests that it has a variable archeopyle (I, 3I or 3Ia) and that its shape varies from rhomboidal to approximately conical; this emendation makes Prominangularia a junior synonym of Bohaidina. Furthermore, Conicoidium is considered to be a junior synonym of Parabohaidina for similar reasons.