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Paleozoic Foraminifera.

C A Ross1, J R Ross

  • 1Chevron U.S.A., Houston, TX 77251.

Bio Systems
|January 1, 1991
PubMed
Summary
This summary is machine-generated.

During the Paleozoic era, eight Foraminifera suborders evolved. One lineage, Fusulinina, rapidly diversified before extinction, potentially seeding later suborders.

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Area of Science:

  • Paleontology
  • Micropaleontology
  • Evolutionary Biology

Background:

  • The Paleozoic Era (approx. 300 million years) witnessed the evolution of eight of fifteen recognized Foraminifera suborders.
  • Seven suborders were morphologically simple, slowly evolving, and ancestral to later lineages.
  • The Fusulinina suborder was abundant, ecologically dominant, and rapidly evolved.

Observation:

  • Fusulinina exhibited rapid evolution from simple to specialized forms with diverse lineages.
  • This suborder became extinct at the end of the Paleozoic.
  • Early Fusulinina may have given rise to three to four post-Paleozoic suborders.

Findings:

  • Several Paleozoic suborders show similar, independent evolutionary patterns.
  • These patterns involve basic morphological steps: simple chambers, aggregated chambers, tubular chambers, chamber constrictions, and true chambers.

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  • These organizational steps appear across lineages with different test compositions, suggesting distant relationships.

    • Implications:

    • The study highlights convergent evolution in early Foraminifera development.
    • Understanding these basic organizational steps is crucial for phylogenetic classification.
    • The Fusulinina lineage's rapid evolution and extinction provide insights into adaptive radiation and evolutionary dead ends.