Oksana Vernygora

Oksana Vernygora
Canadian Food Inspection Agency

Doctor of Philosophy

About

36
Publications
14,567
Reads
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321
Citations
Additional affiliations
November 2020 - May 2022
University of Kentucky
Position
  • Postdoctoral scholar
Education
September 2013 - August 2020
University of Alberta
Field of study
  • Evolution and Systematics
September 2011 - June 2012
North Central College
Field of study
  • Biology/Microbiology
September 2007 - June 2011
Kerch State Maritime Technological University
Kerch State Maritime Technological University
Field of study
  • Mariculture and Aquatic Bioresources

Publications

Publications (36)
Article
Full-text available
Insects have developed various adaptations to survive harsh winter conditions. Among freeze-intolerant species, some produce “antifreeze proteins” (AFPs) that bind to nascent ice crystals and inhibit further ice growth. Such is the case of the spruce budworm, Choristoneura fumiferana (Lepidoptera: Tortricidae), a destructive North American conifer...
Preprint
Character dependency is a major conceptual and methodological problem in phylogenetic inference of morphological datasets, as it violates the assumption of characters independency that is common to all phylogenetic methods. It is more frequently observed in higher-level phylogenies or in datasets characterizing major evolutionary transitions, as th...
Article
Divergence times underpin diverse evolutionary hypotheses, but conflicting age estimates across studies diminish the validity of such hypotheses. These conflicts have continued to grow as large genomics datasets become commonplace and analytical approaches proliferate. To provide more stable temporal intervals, age estimations should be interpreted...
Article
Full-text available
We explored patterns, rates, and unexpected socio‐ecological consequences of tooth replacement in serrasalmids and characids of the Peruvian Amazon using microCT. Of 24 specimens collected in February 2019—representing a mix of red‐bellied piranha Pygocentrus nattereri, redeye piranha Serrasalmus rhombeus, silver dollar fish Ctenobrycon hauxwellian...
Article
The clupeomorph genus Armigatus is an extinct group of fish which comprises five species of small marine fishes described from the Late Cretaceous Tethys Sea. Of the five species, A. alticorpus is the least well known and least studied species. The most recent cladistic analyses of the group exclude A. alticorpus due to a lack of sufficient informa...
Article
Full-text available
The origin of phenotypic diversity among higher clades is one of the most fundamental topics in evolutionary biology. However, due to methodological challenges, few studies have assessed rates of evolution and phenotypic disparity across broad scales of time to understand the evolutionary dynamics behind the origin and early evolution of new clades...
Preprint
Full-text available
Adaptive radiations are long believed to be responsible for the origin of phenotypic diversity and new body plans among higher clades in the fossil record. However, few studies have assessed rates of phenotypic evolution and disparity across broad scales of time to understand the evolutionary dynamics behind the origin of major clades, or how they...
Article
Reconstructing the tree of life is an essential task in evolutionary biology. It demands accurate phylogenetic inference for both extant and extinct organisms, the latter being almost entirely dependent on morphological data. While parsimony methods have traditionally dominated the field of morphological phylogenetics, a rapidly growing number of s...
Article
Full-text available
Full text available at: https://advances.sciencemag.org/content/5/4/eaav3875/tab-pdf. Evolutionary origins of novel forms are often obscure because early and transitional fossils tend to be rare, poorly preserved, or lack proper phylogenetic contexts. We describe a new, exceptionally preserved enigmatic crab from the mid-Cretaceous of Colombia and...
Article
Full-text available
Understanding the origin and early evolution of squamates has been a considerable challenge given the extremely scarce fossil record of early squamates and their poor degree of preservation. In order to overcome those limitations, we conducted high-resolution X-ray computed tomography (CT) studies on the fossil reptile Megachirella wachtleri (Middl...
Article
Shads of the genus Alosa are essential to commercial fisheries across North America and Europe, but in some areas their species boundaries remain controversial. Traditional morphology‐based taxonomy of Alosa spp. has relied heavily on the number of gill rakers and body proportions, but these can be highly variable. We use mitochondrial (mt)DNA (coI...
Article
Although fragmentary remains of sturgeon, such as scutes and pectoral spines, are relatively common in fossil deposits, articulated fossilized skeletons are rare in Upper Cretaceous sediments of North America. Currently, there are four extinct species referred to Acipenseridae reported from the Upper Cretaceous of North America; two of them (†Acipe...
Article
The extinct neoteleost family Dercetidae includes elongate, long-jawed marine fishes that are known from the Late Cretaceous to Paleocene in deposits from the Levant, Europe, North Africa, England, Mexico and Brazil. The fossil record of the family in South America is very sparse and previously was restricted to outcrops in Brazil. Herein we descri...
Article
Full-text available
Modern squamates (lizards, snakes and amphisbaenians) are the world's most diverse group of tetrapods along with birds 1 and have a long evolutionary history, with the oldest known fossils dating from the Middle Jurassic period-168 million years ago2-4. The evolutionary origin of squamates is contentious because of several issues: (1) a fossil gap...
Conference Paper
Full-text available
The family Dercetidae is an extinct group of marine fishes characterized by an elongate body and pronounced rostrum formed by extended jaws. The temporal range of the group extends from the Late Cretaceous to the Paleocene, with nearly 35 species described from the Tethyan deposits of North Africa, the Levant, Europe, Mexico, and Brazil. The fossil...
Article
Full-text available
Mosasauroids were a successful lineage of squamate reptiles (lizards and snakes) that radiated during the Late Cretaceous (95–66 million years ago). They can be considered one of the few lineages in the evolutionary history of tetrapods to have acquired a fully aquatic lifestyle, similarly to whales, ichthyosaurs and plesiosaurs. Despite a long his...
Data
Nexus file with the dataset analysed herein using contingent coding. (NEX)
Data
Nexus file with the dataset analysed herein using multistate coding. (NEX)
Data
New characters list for the dataset used herein. (DOCX)
Data
Bayesian trees. Majority rule consensus trees obtained from the four different prior and hyperprior choice combinations performed herein. (PDF)
Data
Character maps on trees derived from all the analyses performed herein. (PDF)
Article
Full-text available
An articulated series of centra from latest Miocene deposits of Ukraine is described and identified as a species of Lates. The specimen comes from a locality with an estimated age of 6.04–4.7 Ma, representing the northernmost reach of the Paratethys during the Pontian. The specimen almost certainly represents a distinct species, but because it is i...
Article
The extinct clupeomorph genus Armigatus has been included in a number of phylogenetic analyses, with disagreement about its placement and relationships among the fishes of the extinct clupeomorph order Ellimmichthyiformes. There are currently four species known, all from the Late Cretaceous Tethys Sea. Here we describe a fifth species of Armigatus...
Conference Paper
Full-text available
In clupeomorphs (herrings and allies), scutes are modified scales that form a keel along the ventral and/or dorsal margins of the body. Presence of at least one abdominal scute is regarded as a diagnostic character of the Clupeomorpha. Among the extant members of the order Clupeiformes, scute armour is mostly limited to the abdominal series, and pr...
Article
Foreyclupea loonensis, gen. et sp. nov., is described from the early-middle Albian Loon River Formation of the Northwest Territories, Canada. The only specimen of the new species was originally described as a part of an enigmatic taxon Erichalcis arcta in 1975, which was assigned to the Clupeomorpha. Since then, E. arcta has proven to be a composit...
Article
A new species of the genus Armigatus is described from the Cenomanian/early Turonian Akrabou Formation of Morocco. Similar to other ellimmichthyiforms, Armigatus oligodentatus, sp. nov., has parietals in contact with each other along the midline, has a beryciform foramen in the anterior ceratohyal, and lacks the recessus lateralis. The new species...
Article
Migratory stocks of shads passing through the Kerch strait during their seasonal migrations consist of three groups of specimens, that can be identified based on the number of gill rakers on the first arch. These are so called Kerch shad A. maeotica (50.2 %), Pontic shad A. immaculata (48.7 %) and Caspian shad A. caspia (1.1 %). This ratio of speci...

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