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TitleNew insights on the morphology and occurrence of the Palaeogene dinoflagellate cyst species Duosphaeridium rugosum and on the taxonomic affinity of the genus Duosphaeridium
AuthorSoliman, A; Fensome, R A
SourceJournal of Systematic Palaeontology 2019 p. 1-13,
Alt SeriesNatural Resources Canada, Contribution Series 20180148
PublisherInforma UK Limited
Mediapaper; on-line; digital
File formatpdf
AreaDababiya; Egypt
Lat/Long WENS 32.0000 33.0000 27.0000 25.0000
Subjectspaleontology; stratigraphy; Paleogene; Danian; systematic paleontology; micropaleontology; microfossils; fossil descriptions; fossil morphology; fossil distribution, geographic; fossil distribution, strata; taxonomy; paleogeography; scanning electron microscope analyses; microscopic analyses; fossil zones; fossil assemblages; sedimentary environments; paleoecology; biostratigraphy; Dinoflagellates; Duosphaeridium; Duosphaeridium rugosum; Dakhla Formation; Dababiya Quarry; Gonyaulacaceae; Cribroperidinioideae; Danea californica; Carpatella cornuta; Lanternosphaeridium reinhardtii; Parasubbotina pseudobulloides; Spiniferites; Achomosphaera; Fibrocysta; Pterodinium; Cordosphaeridium; Exochosphaeridium; Phanerozoic; Cenozoic; Tertiary
Illustrationsgeoscientific sketch maps; location maps; biostratigraphic charts; lithologic sections; photomicrographs; sketches
ProgramGEM2: Geo-mapping for Energy and Minerals Baffin Petroleum Systems
Released2019 02 06
AbstractThe extinct organic-walled dinoflagellate cyst Duosphaeridium rugosum was first described from the Paleocene (Danian) of the southern USA. It has since been documented at several other localities around the world. Well-preserved specimens from the Danian of the Dakhla Formation in the Dababiya Corehole in southern Egypt, illustrated by light and scanning electron microscope images, reveal new morphological details, most notably parasutural features revealing the paratabulation. Detailed observations indicate that Duosphaeridium rugosum has an L-type ventral arrangement, an essentially straight sulcus, and apparently dextral torsion indicating a tentative affinity with the gonyaulacacean subfamily Cribroperidinioideae. Duosphaeridium rugosum occurs in an assemblage with many Danian markers; such as Danea californica, Carpatella cornuta and Lanternosphaeridium reinhardtii. Its earliest or first occurrence is contemporaneous with the upper part of nannoplankton zone NP2 and the uppermost part of the planktonic foraminiferal Parasubbotina pseudobulloides (P1a) zone. Its first occurrence is thus a useful stratigraphical marker for the Danian (earliest Paleocene). Duosphaeridium rugosum is associated with relatively abundant dinoflagellate cyst taxa such as Spiniferites, Achomosphaera, Fibrocysta, Pterodinium, Cordosphaeridium and Exochosphaeridium, which characterize neritic marine settings.
Summary(Plain Language Summary, not published)
The extinct organic-walled dinoflagellate cyst Duosphaeridium rugosum was first described from the Paleocene of the southern United States. It has since been documented several other localities around the world, including offshore eastern Canada. Our new specimens from Egypt reveal new morphological details that enable us to more accurately relate this species to other dinoflagellates in an evolutionary sense. It's occurrence and our review of the literature confirm that the first occurrence of this species is an excellent biostratigraphic marker and increases its potential for use on Canada's eastern offshore margin.

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