Journal
PALAEOWORLD
Volume 23, Issue 1, Pages 25-30Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.palwor.2013.08.002
Keywords
Bryozoa; Fenhsiang Formation; Nekhorosheviella; Orbiramu; Phosphatic skeleton
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Funding
- National Natural Science Foundation [40806055, 41072002]
- Chinese Academy of Sciences [KZCX2-TW-JC104]
- State Laboratory of Palaeobiology and Stratigraphy at Nanjing Institute of Geology and Palaeontology
- Chinese Academy of Sciences
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The earliest unequivocal bryozoans occurred in the Fenhsiang Formation (upper Tremadocian, Lower Ordovician) of Yichang, South China, providing important clues about the early evolution of primitive bryozoans. In this study, SEM and EDAX were used to analyze the microstructure of the walls of two bryozoan genera, Nekhorosheviella and Orbiramus, from the Fenhsiang Formation. All walls of Nekhorosheviella and endozonal walls of Orbiramus show poor preservation in thin sections, with a granular appearance reflecting extensive neomorphism, whereas exozonal walls of Orbiramus are distinctly laminated. These preservational differences may reflect skeletal chemistry, particularly the magnesium content of the calcite. Phosphatic skeletal linings were found to be distributed unevenly in the autozooecia of Nekhorosheviella, but were absent in Orbiramus. (C) 2013 Elsevier B.V. and Nanjing Institute of Geology and Palaeontology, CAS. All rights reserved.
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