Abstract

Three genera Apectodinium, Kisselovia and Wetzeliella, the fossil dinoflagellate cysts of Wetzeliellaceae, obtained from Eocene sediments from offshore Keelung in northern Taiwan are reported. Two species of the genus Apectodinium (A. homomorphum (Deflandre & Coookson) Lentin & Williams emend. Harland and A. raritubiformium sp. Nov.), three species of the genus Kisselovia (K. pengchiahsuensis sp. Nov., K. coleothrypta (Williams & Downie) Lentin & Williams and K. taiwaniana sp. Nov.) and four new varieties of the genus Wetzeliella (W. symmetrica var. taiwaniana var. nov., W. symmetrica var. scabrata var. nov., W. articulata var. taiwaniana var. nov. and W. articulata var. scabrata var. nov.) are described. They are distributed sporadically in the Eocene formations, but have not been observed in Oligo-Miocene of Taiwan and may therefore have significance as marker species of Eocene.

中文摘要

本文描述發現於台灣基隆北方海域始新世地層中，甲藻類威茲氏化石藻科Apectodinium屬共計兩種 (A. homomorphum (Deflandre & Coookson) Lentin & Williams emend. Harland; A. raritubiformium sp. Nov.)，Kisselovia屬共計三種(K. pengchiahsuensis sp. Nov.; K. taiwaniana sp. Nov.; K. coleothrypta (Williams & Downie) Lentin & Williams)，Wetzeliella屬共計四變種(W. symmetrica var. taiwaniana var. nov.; W. symmetrica var. scabrata var. nov.; W. articulata var. taiwaniana var. nov.; W. var. articulata scabrata var. nov.)。這三屬的化石於台灣僅出現於始新世地層，在漸新世中新世地層皆未發現，或可以做為生物地層的指標。 關鍵詞: 始新世地層、威茲氏化石藻科、台灣、分類。

Keyword: Eocene, Wetzeliellaceous Dinophyceae, Taiwan area, Taxonomy.