Fragilariopsis tigris sp. nov., a new late Pliocene Antarcti
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TitleFragilariopsis tigris sp. nov., a new late Pliocene Antarctic continental shelf diatom with biostratigraphic promiseAbstractA new 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.AcknowledgementsThe author gratefully acknowledges the ANDRILL Program for the award of an ANDRILL Graduate Fellowship, and the AND-IB on-ice diatomists D. Winter, C. Sjunneskog, and R. Scherer for their initial core characterization efforts; both were instrumental in allowing her to pursue this work. S. Starratt generously provided access to an exceptional light microscope and camera system, which was used for all LM images and morphometric characterization presented herein. The guidance of B. Jones was instrumental in acquiring SEM images. Recommendations from J. Barron, J. Self-Trail, and M. Jones significantly improved this manuscript. This work was completed at Stanford University with support from the National Science Foundation under Cooperative Agreement No. 0342484 through subawards administered by the ANDRILL Science Management Office at Nebraska-Lincoln, and issued through Northern Illinois University (for the MIS Project) as part of the ANDRILL U.S. Science Support Program. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Recommendations from J. Barron, J. Self-Trail, and M. Jones significantly improved this manuscript.
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1st AuthorRiesselman, C.AuthorRiesselman, C.Year2012JournalMicropaleontologyVolume58Number4Pages367-376URLhttps://www.scopus.com/inward/recor.....c8329a4dbedca63d1c8fb333bKeywordsbiostratigraphychronostratigraphycontinental shelfdiamictitediatomdiatomitemicroscopynew genusnew speciesPliocenescanning electron microscopy, Southern Ocean, rank1Author KeywordsANDRILLAntarcticaDiatom biostratigraphyFragilariopsisPliocene
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TypeArticleCitationRiesselman, C. (2012) Fragilariopsis tigris sp. nov., a new late Pliocene Antarctic continental shelf diatom with biostratigraphic promise. Micropaleontology, 58(4): 367-376 IdentifierRiesselman2012Relevancerank1
Riesselman, C., Fragilariopsis tigris sp. nov., a new late Pliocene Antarcti , [Riesselman2012]. Antarctica NZ, accessed 19/08/2026, https://adam.antarcticanz.govt.nz/nodes/view/63734