title: Growth, inter- and intraspecific variation, palaeobiogeography, taphonomy and systematics of the Cenozoic ghost shrimpGlypturus.
abstract: Studies in systematic palaeontology are greatly aided when numerous, well-preserved specimens are available so that quantitative methods can be used to substantiate qualitative observations. This is often not the case for fossil decapod crustaceans due to their relatively low preservation potential. Here, we examined primarily two large collections of the well-preserved ghost shrimpGlypturusfrom the Holo-Pleistocene of Panama and the late Miocene of Florida. Using descriptive, bivariate, multivariate and geometric morphometric methods, two new species are described based on appendage material:Glypturus panamacanalensissp. nov. andG. sikesisp. nov. New characters are identified, and size-related and intraspecific variation are assessed for these taxa and modernG. acanthochirus. Taxonomic placement of single specimens from other localities was confirmed by multivariate methods. Furthermore,Glypturusis revised, especially with regard to Western Atlantic species that inhabited both carbonate and siliciclastic environments.Callianassa anguillensis,C. latidigata, andNeocallichirus? quisquellanusare referred to asGlypturussp. until more material is available to determine the validity of these species. Diversity withinGlypturusmay thus be underestimated, thereby also impacting the assessment of phylogenetic relationships. Minor propodi appear under-represented relative to major propodi, suggesting a taphonomic bias. Single specimens of interest include a specimen ofG. panamacanalensissp. nov. exhibiting a peculiar swelling in the fixed finger and another showing damage on the propodal upper margin, suggesting failed predation or antagonistic behaviour.Glypturusis first found in the Oligocene in the Western Atlantic and may have expanded its palaeobiogeographical range since the Miocene. The genus was still present on the Pacific side of the Isthmus of Panama in the Holo-Pleistocene, but is only known from the Western Atlantic today, suggesting a relatively recent extinction on the Pacific side.
authors.affiliation: Florida Museum of Natural History, University of Florida, 1659 Museum Road, PO Box 117800, Gainesville, FL 32611, USA.
authors.forename: Adiël A
authors.initials: AA
authors.lastname: Klompmaker
authors.affiliation: Geological-Paleontological Department, Natural History Museum Vienna, Burgring 7, 1010 Vienna, Austria ; Department of Geology and Paleontology, Faculty of Natural Sciences, Comenius University, Mlynská dolina G1, 842 15 Bratislava, Slovakia.
authors.forename: Matúš
authors.initials: M
authors.lastname: Hyžný
authors.affiliation: Florida Museum of Natural History, University of Florida, 1659 Museum Road, PO Box 117800, Gainesville, FL 32611, USA.
authors.forename: Roger W
authors.initials: RW
authors.lastname: Portell
authors.affiliation: Florida Museum of Natural History, University of Florida, 1659 Museum Road, PO Box 117800, Gainesville, FL 32611, USA.
authors.forename: Michał
authors.initials: M
authors.lastname: Kowalewski
keywords: Cenozoic; biogeography; growth; intraspecific variation; shrimp; systematics
references.citation: Mol Ecol Resour. 2011 Mar;11(2):353-7
references.pmid: 21429143
references.citation: West J Med Surg. 1851 Mar;7(3):265-274
references.pmid: 38209897
references.citation: Nature. 1999 Apr 1;398(6726):415-7
references.pmid: 11536900
references.citation: PLoS One. 2008 Jul 30;3(7):e2791
references.pmid: 18665219
references.citation: PLoS One. 2014 Mar 25;9(3):e92551
references.pmid: 24667587