Abstract

Forty-one Eocene dinoflagellate taxa from offshore Keelung, northern Taiwan are reported, thirty-two of which are described for the first time in Taiwan. They belong to one class, one order, four suborders, twelve families and twenty genera; namely 10 taxa (Spinidinium taiwanianum sp. Nov.; Apectodinium homomorphum (Deflandre & Cookson) Lentin & Williams; Apectodinium raritubiformium Shaw; Kisselovia coleothrypta (Williams & Downie ) Lentin & Williams; K. taiwaniana Shaw in Taiwania; K. pengchiahsuensis Shaw; Wetzeliella symmetrica Weiler var. taiwaniana Shaw; W. symmetrica Weiler var. scabrata Shaw; W. articulata Eisenack var. taiwaniana Shaw; W. articulata Eisenack var. scabrata Shaw), two Families for the Deflandreineae; 14 taxa (Aireiana taiwaniana sp. Nov.; Cordosphaeridium cordium sp. Nov.; C. fibrospinosum Davey & Williams; C. taiwanianum sp. Nov.; Turbiosphaera filosa（Wilson）Archangelsky; Impagidinium gracilium sp. Nov.; I. taiwanianum sp. Nov.; I. pengchiahsum sp. Nov.; Ochetodinium taiwanianum sp. Nov.; Operculodinium taiwanianum sp. Nov.; Achomosphaera taiwaniana sp. Nov.; Spinferites formosus sp. Nov.; S. ramosus subsp. Multibrevis (Davey & Williams) Lentin; S. scabrosus (Clarke & Verdier) Lentin & Williams), 4 Families for the Gonyaulacystineae; 16 taxa (Areoligera taiwaniana sp. Nov.; Batiacasphaera microreticulata sp. Nov.; B. microreticulata Shaw minima var. nov.; B. setulosa sp. Nov.; B. setulosa Shaw minima var. nov.; B. extravermiculata sp. Nov.; B. granulata sp. Nov.; Homotryblium taiwanianum sp. Nov.; Hystrichokolpoma cinctum Klumpp; H. taperinia sp. Nov.; Oligosphaeridium complex Davey & Williams in Davey et al.; Systematophora taiwaniana sp. Nov.; S. placacantha (Deflandre & Cookson ) Davey et al.; Eisenackia circumtabulata Drugg; E. formosana sp. Nov.; E. taiwaniana sp. Nov.), 5 Families for the Hystrichosphaeridiineae and one taxon (Thalassiphora pelagica (Eisenack) Eisenack & Gocht ), one Family for the Incertae.

中文摘要

本文報導發現於台灣基隆北方海域始新世地層中，溝鞭藻化石共計四十一個分類群；並描述第一次出現於始新世地層中的溝鞭藻化石共計三十二個分類群，分別屬於壹綱，壹目，肆亞目，貳拾屬，其中Deflandreineae亞目計有貳科，拾個分類群(Spinidinium taiwanianum sp. Nov.; Apectodinium homomorphum (Deflandre & Cookson ) Lentin & Williams; A. raritubiformium Shaw; Kisselovia coleothrypta (Williams & Downie ) Lentin & Williams; K. taiwaniana Shaw; K. pengchiahsuensis Shaw; Wetzeliella symmetrica Weiler var. taiwaniana Shaw; W. symmetrica Weiler var. scabrata Shaw; W. articulata Eisenack var.taiwaniana Shaw; W. articulata Eisenack var. scabrata Shaw)；Gonyaulacystineae亞目計有肆科，十四個分類群 (Aireiana taiwaniana sp. Nov.; Cordosphaeridium cordium sp. Nov.; C. fibrospinosum Davey & Williams; C. taiwanianum sp. Nov.; Turbiosphaera filosa (Wilson) Archangelsky; Impagidinium gracilium sp. Nov.; I. taiwanianum sp. Nov.; I. pengchiahsum sp. Nov.; Ochetodinium taiwanianum sp. Nov.; Operculodinium taiwanianum sp. Nov.; Achomosphaera taiwaniana sp. Nov.; Spinferites formosus sp. Nov.; S. ramosus subsp. Multibrevis (Davey & Williams) Lentin; S. scabrosus (Clarke & Verdier) Lentin & Williams)；Hystrichosphaeridiineae 亞目計有五科，十六個分類群 (Areoligera taiwaniana sp. Nov.; Batiacasphaera microreticulata sp. Nov.; B. microreticulata Shaw minima var. nov.; B. setulosa sp. Nov.; B. setulosa Shaw minima var. nov.; B. extravermiculata sp. Nov.; B. Granulata sp. Nov.; Homotryblium taiwanianum sp. Nov.; Hystrichokolpoma cinctum Klumpp; H. taperinia sp. Nov.; Oligosphaeridium complex Davey & Williams in Davey et al.; Systematophora taiwaniana sp. Nov. ; S. placacantha (Deflandre & Cookson ) Davey et al.; Eisenackia circumtabulata Drugg; E. formosana sp. Nov.; E. taiwaniana sp. Nov.)；Incertae 亞目計有一科，一個分類群 (Thalassiphora pelagica (Eisenack) Eisenack & Gocht )。 關鍵詞: 始新世地層、溝鞭藻化石、分類、台灣。

Keyword: Eocene, Dinophyceae, Taxonomy, Taiwan area.