What does this research mean for the field?

Taxonomic reassessment confirms Miogypsinella borodinensis and Miogypsinoides lateralis as distinct species, demonstrating that American Oligocene faunas of larger benthic foraminifera were not distinctly isolated as previously proposed. Novelty: ClaimNovelty.CONTRADICTORY. Consensus alignment: ConsensusAlignment.CHALLENGES_CONSENSUS.

What question did this study set out to answer?

Re-evaluate the taxonomic classification and palaeobiogeographical distributions of key Miogypsinidae species, focusing on the genus Miogypsinella and Miogypsinoides lateralis.

August 29, 2026Journal of MicropalaeontologyOpen Access

Taxonomic reassessment and palaeobiogeographical patterns of some Miogypsinidae species, larger benthic foraminifera

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Authors

DBDavide Bassi JBJuan C. Braga SKShunichi Kinoshita

Discussion

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Overview

Taxonomic reassessment reveals trans-Pacific dispersal and distinct lineages in ancient benthic foraminifera, suggesting reduced isolation between Oligocene faunas.

Key Points

Re-evaluate the taxonomic classification and palaeobiogeographical distributions of key Miogypsinidae species, focusing on the genus Miogypsinella and Miogypsinoides lateralis.
Conducted computed tomography (CT) scan analyses on type specimens of Miogypsinella borodinensis from the Chattian stage of Kitadaito Jima.
Compiled and reviewed geographical records, stratigraphic ranges, and published specimen illustrations across the Indo-Pacific and eastern Pacific regions.
Validated Miogypsinella borodinensis as a distinct species from Miogypsinoides complanatus, documenting its Chattian emergence in the Indo-Pacific and subsequent dispersal into Central America during the Aquitanian.
Demonstrated that Miogypsinoides lateralis represents an exception to assumed morphological trends within its lineage, displaying Burdigalian–Langhian morphometrics prematurely in the Aquitanian.
Identified the constriction of the Indonesian Seaway and widespread drowning of carbonate platforms as the primary drivers of extinction for these species in the latest Aquitanian.

Cite This Study

Bassi et al. (2026) studied this question.

synapsesocial.com/papers/6a92991a8e5d7d1fc0c10dd7 https://doi.org/10.5194/jm-45-653-2026

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August 29, 2026Journal of MicropalaeontologyOpen Access

Taxonomic reassessment and palaeobiogeographical patterns of some Miogypsinidae species, larger benthic foraminifera

View Full Paper

Ask AI

Bookmark

Authors

DBDavide Bassi JBJuan C. Braga SKShunichi Kinoshita

Discussion

Member takes

Overview

Taxonomic reassessment reveals trans-Pacific dispersal and distinct lineages in ancient benthic foraminifera, suggesting reduced isolation between Oligocene faunas.

Key Points

Re-evaluate the taxonomic classification and palaeobiogeographical distributions of key Miogypsinidae species, focusing on the genus Miogypsinella and Miogypsinoides lateralis.
Conducted computed tomography (CT) scan analyses on type specimens of Miogypsinella borodinensis from the Chattian stage of Kitadaito Jima.
Compiled and reviewed geographical records, stratigraphic ranges, and published specimen illustrations across the Indo-Pacific and eastern Pacific regions.
Validated Miogypsinella borodinensis as a distinct species from Miogypsinoides complanatus, documenting its Chattian emergence in the Indo-Pacific and subsequent dispersal into Central America during the Aquitanian.
Demonstrated that Miogypsinoides lateralis represents an exception to assumed morphological trends within its lineage, displaying Burdigalian–Langhian morphometrics prematurely in the Aquitanian.
Identified the constriction of the Indonesian Seaway and widespread drowning of carbonate platforms as the primary drivers of extinction for these species in the latest Aquitanian.

Cite This Study

Bassi et al. (2026) studied this question.

synapsesocial.com/papers/6a92991a8e5d7d1fc0c10dd7 https://doi.org/10.5194/jm-45-653-2026

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