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The problematic aquatic palynomorph genus Cobricosphaeridium Harland and Sarjeant, 1970 emend., with new records from the Holocene of Argentina

Published online by Cambridge University Press:  20 May 2016

Martin J. Head ,
C. Marcela Borel ,
G. Raquel Guerstein  and
Rex Harland
Martin J. Head
Affiliation:
1Godwin Institute for Quaternary Research, Department of Geography, University of Cambridge, Downing Place, Cambridge CB2 3EN, United Kingdom,
C. Marcela Borel
Affiliation:
2Departamento de Geología, Universidad Nacional del Sur, San Juan 670, (8000) Bahía Blanca, Argentina,
G. Raquel Guerstein
Affiliation:
3Consejo Nacional de Investigaciones Científicas y Técnicas, Departamento de Geología, Universidad Nacional del Sur, San Juan 670, (8000) Bahía Blanca, Argentina,
Rex Harland
Affiliation:
4DinoData Services, 50 Long Acre, Bingham, Nottingham NG13 8AH, and Palynology Research Facility, Department of Animal and Plant Sciences, University of Sheffield, Alfred Denny Building, Sheffield S10 2TN, United Kingdom,
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Abstract

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.

Type
Research Article
Information
Journal of Paleontology , Volume 77 , Issue 6 , November 2003 , pp. 1159 - 1181
Copyright
Copyright © The Paleontological Society 

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