Evolutionary Trends in Bolivina From Maastrichtian to Eocene, Nigeria
- Enam O. Obiosio
Abstract
SEM study of Maastrichtian to Eocene bolivinids shows evolutionary trends of biocharacters in recognized lineage leading from Afrobolivina afra to Bolivina ignara. The foremost trends is the reduction in size of the Afrobolivina afra to Bolivina ignara. Other trends are: increased flare of chambers (B. ignara), development of coarser and more widely set pores (B. striatella, B. ottaensis and B. ignara), more closely set pores (Afrobolivina afra and B. africana), development of costae and sutural lobes that became less prominent from Afrobolivina afra to B. ignara. Two phylogenetic lineages are proposed based on evolutionary trends that have allowed the linkage of related forms: Afrobolivina afra, Bolivina africana, B. striatella and B. ottaensis, and Afrobolivina afra, B. africana and B. ignara.- Full Text:
PDF
- DOI:10.5539/esr.v2n2p128
Journal Metrics
Google-based Impact Factor (2021): 0.74
h-index (December 2021): 18
i10-index (December 2021): N/A
h5-index (December 2021): N/A
h5-median(December 2021): 53
( The data was calculated based on Google Scholar Citations. Click Here to Learn More. )
Index
- ACNP
- Aerospace Database
- BASE (Bielefeld Academic Search Engine)
- Civil Engineering Abstracts
- CNKI Scholar
- EuroPub Database
- Excellence in Research for Australia (ERA)
- Google Scholar
- Harvard Library
- IDEAS
- LOCKSS
- Mendeley
- MIAR
- NewJour
- PKP Open Archives Harvester
- Scilit
- SHERPA/RoMEO
- Standard Periodical Directory
- UCR Library
- Ulrich's
- WorldCat
Contact
- Lesley LuoEditorial Assistant
- esr@ccsenet.org