Middle Pleistocene (early Rancholabrean) vertebrates and associated marine and non-marine invertebrates from Oldsmar, Pinellas County, Florida

Karrow, P. F.; Morgan, Gary; Portell, Roger W.; Simons, Elwyn L.; Auffenberg, Kurt

doi:10.3138/9781487574154-009

Cited by 9 publications

(13 citation statements)

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“…Given all data sets contained a single individual from each species sampled, a Yule tree prior was chosen for the BEAST analysis. Fossil limits were used to calibrate the leucopus/maniculatus group (~0.3 million years ago [mya]- Dalquest 1962;Karow et al 1996) and Reithrodontomys (~1.8 mya-Cassiliano 1999). To account for the uncertainty in the fossil record, a prior lognormal distribution was used for both calibrations with means and standard deviations adjusted to create an upper bound of 14.8 mya to reflect the closest dated fossil outside of the taxa sampled (Behrensmeyer and Turner 2013).…”

Section: Methodsmentioning

confidence: 99%

What IsPeromyscus? Evidence from nuclear and mitochondrial DNA sequences suggests the need for a new classification

Platt

Amman

Keith

et al. 2015

JMAMMA

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The evolutionary relationships between ,, ,, ,, and are poorly understood. In order to further explore the evolutionary boundaries of and compare potential taxonomic solutions for this diverse group and its relatives, we conducted phylogenetic analyses of DNA sequence data from alcohol dehydrogenase (1-I2), beta fibrinogen (-I7), interphotoreceptor retinoid-binding protein (3), and cytochrome- (). Phylogenetic analyses of mitochondrial and nuclear genes produced similar topologies although levels of nodal support varied. The best-supported topology was obtained by combining nuclear and mitochondrial sequences. No monophyletic clade was supported. Instead, support was found for a clade containing, ,, ,, and suggesting paraphyly of and confirming previous observations. Our analyses indicated an early divergence of from (approximately 8 million years ago), whereas most other peromyscine taxa emerged within the last 6 million years. To recover a monophyletic taxonomy from and affiliated lineages, we detail 3 taxonomic options in which, ,, , and are retained as genera, subsumed as subgenera, or subsumed as species groups within . Each option presents distinct taxonomic challenges, and the appropriate taxonomy must reflect the substantial levels of morphological divergence that characterize this group while maintaining the monophyletic relationships obtained from genetic data.

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Section: Methodsmentioning

confidence: 99%

What IsPeromyscus? Evidence from nuclear and mitochondrial DNA sequences suggests the need for a new classification

Platt

Amman

Keith

et al. 2015

JMAMMA

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“…We used three calibration points with a lognormal distribution. Calibrations were based on fossil records (million years ago [mya]) of (1) Reithrodontomys (mean = 1.8, stdev = 1.076, offset = 1.63), as used by Steppan and Schenk (2017); (2) Onychomys (mean = 4.9, stdev = 1.169, offset = 4.753), as used by Steppan and Schenk (2017); and (3) the most recent common ancestor of P. attwateri (mean = 2.7, stdev = 0.9, offset = 2.4 [ Dalquest, 1962;Karow et al, 1996;Wright et al, 2020]) (Supplementary Tables S2, S3). Two separated runs of 50 million iterations each were sampled every 1,000 iterations.…”

Section: Divergence Time Estimatesmentioning

confidence: 99%

Museomics and the holotype of a critically endangered cricetid rodent provide key evidence of an undescribed genus

et al. 2022

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Historical DNA obtained from voucher specimens housed in natural history museums worldwide have allowed the study of elusive, rare or even extinct species that in many cases are solely represented by museum holdings. This has resulted in the increase of taxonomic representation of many taxa, has led to the discovery of new species, and has yielded stunning novel insights into the evolutionary history of cryptic or even undescribed species. Peromyscus mekisturus, is a critically endangered cricetid rodent endemic to Mexico and is only known from two museum specimens collected in 1898 and 1947. Intensive field work efforts to attempt to determine if viable populations still exist have failed, suggesting that this species is extinct or is nearing extinction. In addition, a recent study using mitogenomes demonstrated that P. mekisturus forms a well-supported clade outside the genus Peromyscus and hypothesized that this taxon is the sister group of the genus Reithrodontomys. Here, we used target enrichment and high-throughput sequencing of several thousand nuclear ultraconserved elements and mitogenomes to reconstruct dated phylogenies to test the previous phylogenetic hypothesis. We analyzed the holotype and the only other known specimen of P. mekisturus and museum samples from other peromyscine rodents to test the phylogenetic position of the species. Our results confirm that the only two specimens known to science of P. mekisturus belong to the same species and support the hypothesis that this species belongs to an undescribed genus of cricetid rodents that is sister to the genus Reithrodontomys. We dated the origin of P. mekisturus together with other speciation events in peromyscines during the late Pliocene – early Pleistocene and related these events with the Pleistocene climatic cycles. In light of our results, we recommend a taxonomic re-evaluation of this enigmatic species to properly recognize its taxonomic status as a new genus. We also acknowledge the relevance of generating genomic data from type specimens and highlight the need and importance of continuing to build the scientific heritage of the collections to study and better understand past, present, and future biodiversity.

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“…E. laurillardi probably replaced E. eomigans in Florida during the late Irvingtonian or early Rancholabrean, although the geographic origin of the former is uncertain. The Daytona Beach local fauna has been dated as late early Rancholabrean, probably just older than the boundary between the early and late Rancholabrean, which is placed at approximately 0.13 Ma (Morgan & Hulbert, 1995;Karrow et al, 1996).…”

Section: Discussionmentioning

confidence: 99%

A new giant megatheriine ground sloth (Mammalia: Xenarthra: Megatheriidae) from the late Blancan to early Irvingtonian of Florida

Iuliis

Cartelle

1999

Zoological Journal of the Linnean Society

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The giant megatheriine ground sloth Eremotherium eomigrans is described based on remains from the late Blancan to early Irvingtonian (late Pliocene to early Pleistocene) of Florida. It resembles the other giant megatherunes E. laurillardi and Megatherium ammcanum in size, but is clearly distinguished by a pentadactyl manus. It is assigned to the genus Eremothm'um based on two synapomorphies shared with E. laurillardi: a coarse and rugose ectotympanic that ventrally is prominently expanded mediolaterally, and contiguous articular facets of the axis for the atlas. E. eomigrans is the earliest megatheriine known to have

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Middle Pleistocene (early Rancholabrean) vertebrates and associated marine and non-marine invertebrates from Oldsmar, Pinellas County, Florida

Cited by 9 publications

References 0 publications

What IsPeromyscus? Evidence from nuclear and mitochondrial DNA sequences suggests the need for a new classification

What IsPeromyscus? Evidence from nuclear and mitochondrial DNA sequences suggests the need for a new classification

Museomics and the holotype of a critically endangered cricetid rodent provide key evidence of an undescribed genus

A new giant megatheriine ground sloth (Mammalia: Xenarthra: Megatheriidae) from the late Blancan to early Irvingtonian of Florida

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