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GEOREF RECORD

Ontogeny and thanatocoenoses of early Middle Ordovician palaeocope ostracode species Brezelina palmata (Krause, 1889) and Ogmoopsis bocki (Opik, 1935)

Oive Tinn and Tonu Meidla
Ontogeny and thanatocoenoses of early Middle Ordovician palaeocope ostracode species Brezelina palmata (Krause, 1889) and Ogmoopsis bocki (Opik, 1935)
Journal of Paleontology (January 2003) 77 (1): 64-72

Abstract

The ctenonotellid ostracode species Brezelina palmata (Krause, 1889) and the tetradellid species Ogmoopsis bocki (Opik, 1935) are represented by seven and five molting stages, respectively. Both species display an association of velar and size dimorphism in the three last instars. The analysis of the juvenile morphology of O. bocki provides evidence for a close relationship with the earliest known palaeocope ostracode species Nanopsis nanella (Moberg and Segerberg, 1906). The population age structure of B. palmata in synchronous beds at two localities reveals different types of thanatocoenoses, supporting the hypothesis of a deepening gradient along the Baltic-Ladoga Klint.


ISSN: 0022-3360
EISSN: 1937-2337
Coden: JPALAZ
Serial Title: Journal of Paleontology
Serial Volume: 77
Serial Issue: 1
Title: Ontogeny and thanatocoenoses of early Middle Ordovician palaeocope ostracode species Brezelina palmata (Krause, 1889) and Ogmoopsis bocki (Opik, 1935)
Affiliation: University of Tartu, Institute of Geology, Tartu, Estonia
Pages: 64-72
Published: 200301
Text Language: English
Publisher: Paleontological Society, Lawrence, KS, United States
References: 46
Accession Number: 2003-024473
Categories: Invertebrate paleontology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. col., sketch map
N59°00'00" - N59°30'00", E23°00'00" - E27°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute.
Update Code: 200309
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