Fragilariopsis tigris sp. nov., a New Late Pliocene Antarctic Continental Shelf Diatom with Biostratigraphic Promise

Anew species within the genus Fragilariopsis, F. tigris, is described and illustrated using light microscopy and scanning electron microscopy. This species is restricted to a single 8-meter-thick diatom unit within the 585-meter-long section of alternating diatomites and diamictites recovered in the...

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Bibliographic Details
Main Author: Riesselman, Christina R.
Format: Text
Language:unknown
Published: DigitalCommons@University of Nebraska - Lincoln 2012
Subjects:
Pliocene
Antarctica
diatom biostratigraphy
Fragilariopsis
ANDRILL
Oceanography
Paleobiology
Antarctic
McMurdo Ice Shelf
The Antarctic
Antarc*
Ice Shelf
Online Access:https://digitalcommons.unl.edu/andrillrespub/64
https://digitalcommons.unl.edu/context/andrillrespub/article/1064/viewcontent/Riesselman_MP_2012_F._tigris_a_new_late_Pliocene_Antartic_diatom.pdf
Description
Summary:Anew species within the genus Fragilariopsis, F. tigris, is described and illustrated using light microscopy and scanning electron microscopy. This species is restricted to a single 8-meter-thick diatom unit within the 585-meter-long section of alternating diatomites and diamictites recovered in the upper portion of the ANtarctic geological DRILLing (ANDRILL) McMurdo Ice Shelf Project (MIS) AND-1B marine sediment core. This new taxon from a diverse, well-preserved diatom assemblage is inferred to be the youngest member of the well-documented, biostratigraphically useful F. praeinterfrigidaria – F. interfrigidaria – F. weaveri lineage and may represent a near-shore corollary to the open-ocean species F. weaveri. Based on available chronostratigraphic data from AND-1B, F. tigris appears to be restricted to the earliest late Pliocene (first occurrence datum ~3.2 Ma) and is extinct before 3.0 Ma.

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