Evaluating recent taxonomic changes for alligator snapping turtles (Testudines: Chelydridae).

  title={Evaluating recent taxonomic changes for alligator snapping turtles (Testudines: Chelydridae).},
  author={Brian Folt and Craig Guyer},
  volume={3947 3},
The Alligator Snapping Turtle (Macrochelys temminckii Troost in Harlan 1835, sensu lato) has been historically treated as a single, wide-ranging species, until a recently published paper by Thomas et al. (2014; hereafter Thomas et al.) analyzed variation in morphology and mitochondrial DNA sequence data to describe two new species of Macrochelys: the Apalachicola Alligator Snapping Turtle (Macrochelys apalachicolae Thomas, Granatosky, Bourque, Krysko, Moler, Gamble, Suarez, Leone & Roman 2014… 

The Status of Macrochelys temminckii (Alligator Snapping Turtle) in the Flint River, GA, 22 Years after the Close of Commercial Harvest

The findings suggest that the Alligator Snapping Turtle population in the Flint River has not increased despite 22 years of protection from commercial harvest, and recovery may be hampered by life-history characteristics of the species including delayed maturity and low reproductive output.

Distribution and Relative Abundance of the Suwannee Alligator Snapping Turtle (Macrochelys suwanniensis)

Abstract. The Suwannee alligator snapping turtle (Macrochelys suwanniensis) was first described in 2014. The species is thought to occur in blackwater and spring-fed streams of sufficient size

Population Status of the Suwannee Alligator Snapping Turtle (Macrochelys suwanniensis) in the Suwannee River, Florida

Abstract. Freshwater megafauna populations, which are declining worldwide, are well known but often overlooked and understudied compared with marine and terrestrial megafauna. One species of

Establishing Reference Demography for Conservation: A Case Study of Macrochelys temminckii in Spring Creek, Georgia

It is suggested that the population parameters described at Spring Creek are the best approximation of reference demographic conditions for Macrochelys to date, and this study provides a general framework applicable for large, long-lived, endangered turtle species for which demographic data are unavailable.

Non-Native Turtles (Chelydridae) in Freshwater Ecosystems in Italy: A Threat to Biodiversity and Human Health?

Simple Summary Marketed globally, freshwater turtles are popular pets. However, the introduction of non-native species can pose a serious threat to biodiversity as well as to human health as carriers

A Review of the Fossil Record of Turtles of the Clade Pan-Chelydridae

  • W. Joyce
  • Environmental Science, Geography
    Bulletin of the Peabody Museum of Natural History
  • 2016
Turtles of the total clade Pan-Chelydridae have a relatively sparse fossil record that reaches back to the Late Cretaceous (Santonian) but spread along unclear routes to Asia and Europe during the Paleocene, only to go extinct on those continents by the end of the Pliocene.

Patterns of diversification in a North American endemic fish, the Blackbanded Darter (Perciformes, Percidae)

It is suggested that Percina nigrofasciata sensu stricto occurs from the Lake Pontchartrain Basin in Louisiana to the rivers of the Mobile Basin with little genetic structuring throughout its range, and that P. crypta is not genetically distinct from P. westfalli.

Phylogenetic, population genetic, and morphological analyses reveal evidence for one species of Eastern Indigo Snake (Drymarchon couperi)

Drymarchon kolpobasileus is formally placed into synonymy with D. couperi and inconsistent patterns between mitochondrial and nuclear DNA may be driven by high dispersal of males relative to females.

Taxonomic and conservation implications of population genetic admixture, mito-nuclear discordance, and male-biased dispersal of a large endangered snake, Drymarchon couperi

Examining Drymarchon couperi, a large, federally-protected species in North America that was recently divided into two species, is examined, and inconsistent patterns between mitochondrial and nuclear DNA are suggested to be driven by high dispersal of males relative to females.

Biodiversity and Phylogenetics of Metazoan Parasites Infecting Freshwater Turtles

New genus and species of turtle blood fluke infecting six-tubercled Amazon River turtles, Podocnemis sextuberculata (Pleurodira) from the Amazon River Basin (Peru) are identified.



Taxonomic assessment of Alligator Snapping Turtles (Chelydridae: Macrochelys), with the description of two new species from the southeastern United States.

The morphological and molecular data both indicate significant geographical variation and suggest three species-level breaks among genetic lineages that correspond to previously hypothesized genetic assemblages, which has conservation and management implications in Florida, Georgia, and Alabama.

Population Structure and Cryptic Evolutionary Units in the Alligator Snapping Turtle

The population structure by river system indicates that many drainages are distinct management units, with the Suwannee River lineage possibly deserving special attention, based on the criterion of genetic distinctiveness.

Genetic and Morphological Variation Between Populations of the Pascagoula Map Turtle (Graptemys gibbonsi) in the Pearl and Pascagoula Rivers with Description of a New Species

A new species is described from the Pearl River, restricting the species G. gibbonsi to the Pascagoula River, based on the degree of differentiation in morphology, color patterns, and mtDNA.

Cranial variation amongst independent lineages of the alligator snapping turtle (Macrochelys temminckii)

Dorsal, lateral and ventral cranial shape analyses corroborate the uniqueness of populations recovered by molecular genetic hypotheses and reveal near equal separation between drainages that were assigned to monophyletic clades by previous phylogenetic studies.

Conservation genetics of the alligator snapping turtle: cytonuclear evidence of range-wide bottleneck effects and unusually pronounced geographic structure

Microsatellite data reinforce the conclusion from mtDNA that the Suwannee River population might eventually be recognized as a distinct taxonomic unit, and it was the only population showing fixation or near fixation for otherwise rare microsatellite alleles.

Delimiting species using DNA and morphological variation and discordant species limits in spiny lizards (Sceloporus).

This paper compares species limits inferred from three approaches for species delimitation, using morphological and mtDNA data for the Yarrow's spiny lizard (Sceloporus jarrovii), a traditionally polytypic species from the southwestern United States and Mexico, and finds the greatest support for the five species that are delimited based on mt DNA data.

Discordant mitochondrial and nuclear gene phylogenies in emydid turtles: implications for speciation and conservation

Do phylogenies and branch lengths based on mitochondrial DNA (mtDNA) provide a reasonable approximation to those based on multiple nuclear loci? In the present study, we show widespread discordance

The Alligator Snapping Turtle: Biology and Conservation

The alligator snapping turtle is one of the most celebrated of the world's turtles. Yet, despite its unquestionable familiarity among even the most dilettante turtle enthusiasts and hobbyist, it

Using Multivariate Statistics

In this Section: 1. Multivariate Statistics: Why? and 2. A Guide to Statistical Techniques: Using the Book Research Questions and Associated Techniques.

Using multivariate statistics, 5th ed.