THE PROBLEMATIC AQUATIC PALYNOMORPH GENUS COBRICOSPHAERIDIUM HARLAND AND SARJEANT, 1970 EMEND., WITH NEW RECORDS FROM THE HOLOCENE OF ARGENTINA

The aquatic palynomorph genus Cobricosphaeridium Harland and Sarjeant, 1970 was described from Holocene deposits of Australia. Restudy of the type material shows that these palynomorphs may represent the eggs of crustaceans, and that earlier attributions to the division Dinoflagellata are unsustaina...

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Bibliographic Details
Published inJournal of paleontology Vol. 77; no. 6; pp. 1159 - 1181
Main Authors HEAD, MARTIN J, BOREL, C. MARCELA, GUERSTEIN, G. RAQUEL, HARLAND, REX
Format Journal Article
LanguageEnglish
Published New York, USA Cambridge University Press 01.11.2003
Paleontological Society
Subjects
Algae
Crustaceans
Cysts
Eggs
Fossils
Fresh water
Holocene
Holotypes
Lakes
Microscope slides
Paleontology
Palynology
Palynomorphs
Shellfish
Specimens
Taxa
Argentina
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Summary:The aquatic palynomorph genus Cobricosphaeridium Harland and Sarjeant, 1970 was described from Holocene deposits of Australia. Restudy of the type material shows that these palynomorphs may represent the eggs of crustaceans, and that earlier attributions to the division Dinoflagellata are unsustainable. The genus Aquadulcum Harland and Sarjeant, 1970, also first described as a dinoflagellate from the Holocene of Australia, is treated as a synonym of Cobricosphaeridium, and the following new combinations are proposed: C. awendae, C. myalupense, C. pikeae, C. serpens, C. yanchepense, C.? ovatum, and C.? vermiculatum. Previous records of the genus are restricted to the Holocene and indicate a freshwater affinity. Cobricosphaeridium has now been found in Holocene subsurface brackish deposits of Laguna Hinojales in eastern Argentina. This is the first record of this genus from South America and unequivocally extends its ecological range into a brackish environment. Several species are represented, including Cobricosphaeridium hinojalensis new species; and their potential as paleoenvironmental indicators is evaluated.
ISSN:0022-3360
1937-2337
DOI:10.1666/0022-3360(2003)077<1159:TPAPGC>2.0.CO;2