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Peter V. Lindeman - One of the best experts on this subject based on the ideXlab platform.
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Diets of Syntopic Black-knobbed Sawbacks (Graptemys nigrinoda) and Alabama Map Turtles (Graptemys pulchra) in the Alabama River
The American Midland Naturalist, 2016Co-Authors: Peter V. LindemanAbstract:Abstract The emydid turtle genus Graptemys is characterized by intra- and interspecific dietary diversity. Sympatric species pairs typically differ in trophic morphology and dependence on bivalve mollusks in female diets, yet there is a lack of comprehensive comparisons of the diets of sympatric species. I collected feces from 92 black-knobbed sawbacks (G. nigrinoda) and 54 Alabama map turtles (G. pulchra) from the Alabama River at a site in Autauga and Lowndes counties, Alabama. Samples were analyzed separately for unsexed juveniles, adult males, juvenile females larger than the smallest mature males, and adult females of each species. Sponges, aquatic insects (particularly caddisfly larvae), and filamentous algae were the primary foods of G. nigrinoda. Native mussels, invasive Asian clams, and aquatic insects (but few caddisfly larvae) were the primary foods of G. pulchra. Each of the four sex and size classes exhibited substantially greater similarity with conspecific classes than with classes of the o...
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Habitat-Related Variation in Body Size and Reproductive Output and an Examination of Reproductive Allometry in the Sabine Map Turtle (Graptemys sabinensis) across Three River Drainages
Copeia, 2016Co-Authors: Amy K. Fehrenbach, Will Selman, Irvin Louque, Stacy L. Mcfadden, Cybil C. Huntzinger, Eddie K. Lyons, Stephen H. Shively, Peter V. LindemanAbstract:The Sabine Map Turtle (Graptemys sabinensis) inhabits the Sabine-Neches, Calcasieu, and Mermentau river drainages of southwestern Louisiana and east Texas. Sparse data in the literature mark it as having among the smallest body sizes and smallest clutch sizes among the 14 species of the genus Graptemys. All available data on life history originate from the upper Sabine and upper Calcasieu drainages, which are relatively high-gradient rivers with fast currents and numerous sandbars. Downstream segments of these drainages and the entire Mermentau drainage have almost no gradient, with little perceptible current and no sandbars. We sampled G. sabinensis from the Mermentau River and upper and lower portions of both the Sabine and Calcasieu drainages. We collected data on body size and radiographed gravid females in the lower Calcasieu and Mermentau drainages to examine clutch size and egg width and compared our data to literature records and measurements of museum specimens. Both males (to 104 mm in midline p...
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Intersexual allometry differences and ontogenetic shifts of coloration patterns in two aquatic turtles, Graptemys oculifera and Graptemys flavimaculata
Ecology and evolution, 2015Co-Authors: Joshua R. Ennen, Peter V. Lindeman, Jeffrey E. LovichAbstract:Coloration can play critical roles in a species' biology. The allometry of color patterns may be useful for elucidating the evolutionary mechanisms responsible for shaping the traits. We measured characteristics relating to eight aspects of color patterns from Graptemys oculifera and G. flavimaculata to investigate the allometric differences among male, female, and unsexed juvenile specimens. Additionally, we investigated ontogenetic shifts by incorporating the unsexed juveniles into the male and female datasets. In general, male color traits were isometric (i.e., color scaled with body size), while females and juvenile color traits were hypoallometric, growing in size more slowly than the increase in body size. When we included unsexed juveniles in our male and female datasets, our linear regression analyses found all relationships to be hypoallometric and our model selection analysis found support for nonlinear models describing the relationship between body size and color patterns, suggestive of an ontogenetic shift in coloration traits for both sexes at maturity. Although color is critical for many species' biology and therefore under strong selective pressure in many other species, our results are likely explained by an epiphenomenon related to the different selection pressures on body size and growth rates between juveniles and adults and less attributable to the evolution of color patterns themselves.
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Surveys of Basking Turtles in the Rivers of Northeastern Oklahoma, with Emphasis on Graptemys geographica (Common Map Turtle)
2015Co-Authors: Peter V. LindemanAbstract:I used binoculars and a spotting scope with a built-in digital camera to survey basking turtles at 29 sites on tributary drainages of the Arkansas River in four counties of northeastern Oklahoma and one county of southeastern Kansas. The predominant species recorded were Graptemys ouachitensis (Ouachita map turtle; 57% of all turtles) and Trachemys scripta (slider turtle; 25%), typical of results for rivers with similar assemblages of turtle species in the central United States. There were two notable results of the surveys. First, I photographed a male Graptemys geographica (common map turtle) twice at a site on the Spring River in Ottawa County; the record is only the third locality reported for the species in Oklahoma and is the first vouchered locality since the initial report of the species in Oklahoma in 1927. Prospects for finding additional localities for G. geographica in eastern Oklahoma are discussed, based on records in adjacent Kansas, Arkansas, and Missouri. Second, I observed Apalone spinifera (spiny softshell) at a higher frequency compared to basking turtle surveys that have been conducted elsewhere within its range. ©2014 Oklahoma Academy of Science
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On the Type Locality and Type Specimen of Testudo geographica LeSueur 1817
Chelonian Conservation and Biology, 2009Co-Authors: Peter V. LindemanAbstract:Abstract Charles Alexandre LeSueur discovered the common map turtle Graptemys geographica in 1816. He named the species Testudo geographica in 1817 and described it with a drawing of a specimen he collected from a Lake Erie marsh, but further details on the collecting locality were not given. I designate the drawn specimen as the lectotype of the species and review historical documents and specimen records that allow restriction of the type locality to the peninsula of Presque Isle and adjacent Presque Isle Bay in Erie County, Pennsylvania.
Jeffrey E. Lovich - One of the best experts on this subject based on the ideXlab platform.
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Intersexual allometry differences and ontogenetic shifts of coloration patterns in two aquatic turtles, Graptemys oculifera and Graptemys flavimaculata
Ecology and evolution, 2015Co-Authors: Joshua R. Ennen, Peter V. Lindeman, Jeffrey E. LovichAbstract:Coloration can play critical roles in a species' biology. The allometry of color patterns may be useful for elucidating the evolutionary mechanisms responsible for shaping the traits. We measured characteristics relating to eight aspects of color patterns from Graptemys oculifera and G. flavimaculata to investigate the allometric differences among male, female, and unsexed juvenile specimens. Additionally, we investigated ontogenetic shifts by incorporating the unsexed juveniles into the male and female datasets. In general, male color traits were isometric (i.e., color scaled with body size), while females and juvenile color traits were hypoallometric, growing in size more slowly than the increase in body size. When we included unsexed juveniles in our male and female datasets, our linear regression analyses found all relationships to be hypoallometric and our model selection analysis found support for nonlinear models describing the relationship between body size and color patterns, suggestive of an ontogenetic shift in coloration traits for both sexes at maturity. Although color is critical for many species' biology and therefore under strong selective pressure in many other species, our results are likely explained by an epiphenomenon related to the different selection pressures on body size and growth rates between juveniles and adults and less attributable to the evolution of color patterns themselves.
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Hybridization of Two Megacephalic Map Turtles (Testudines: Emydidae: Graptemys) in the Choctawhatchee River Drainage of Alabama and Florida
Copeia, 2014Co-Authors: James C. Godwin, Jeffrey E. Lovich, Joshua R. Ennen, Brian R. Kreiser, Brian Folt, Chris LechowiczAbstract:Map turtles of the genus Graptemys are highly aquatic and rarely undergo terrestrial movements, and limited dispersal among drainages has been hypothesized to drive drainage-specific endemism and high species richness of this group in the southeastern United States. Until recently, two members of the megacephalic “pulchra clade,” Graptemys barbouri and Graptemys ernsti, were presumed to be allopatric with a gap in both species' ranges in the Choctawhatchee River drainage. In this paper, we analyzed variation in morphology (head and shell patterns) and genetics (mitochondrial DNA and microsatellite loci) from G. barbouri, G. ernsti, and Graptemys sp. collected from the Choctawhatchee River drainage, and we document the syntopic occurrence of those species and back-crossed individuals of mixed ancestry in the Choctawhatchee River drainage. Our results provide a first counter-example to the pattern of drainage-specific endemism in megacephalic Graptemys. Geologic events associated with Pliocene and Pleistoce...
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Graptemys pulchra baur 1893 alabama map turtle
2014Co-Authors: Jeffrey E. Lovich, James C. Godwin, C J MccoyAbstract:072.1 Conservation Biology of Freshwater Turtles and Tortoises: A Compilation Project of the IUCN/SSC Tortoise and Freshwater Turtle Specialist Group A.G.J. Rhodin, P.C.H. Pritchard, P.P. van Dijk, R.A. Saumure, K.A. Buhlmann, J.B. Iverson, and R.A. Mittermeier, Eds. Chelonian Research Monographs (ISSN 1088-7105) No. 5, doi:10.3854/crm.5.072.pulchra.v1.2014 © 2014 by Chelonian Research Foundation • Published 6 January 2014
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Graptemys ernsti lovich and mccoy 1992 escambia map turtle
2011Co-Authors: Ernsti Lovich, James C. Godwin, Jeffrey E. Lovich, C J MccoyAbstract:051.1 Conservation Biology of Freshwater Turtles and Tortoises: A Compilation Project of the IUCN/SSC Tortoise and Freshwater Turtle Specialist Group A.G.J. Rhodin, P.C.H. Pritchard, P.P. van Dijk, R.A. Saumure, K.A. Buhlmann, J.B. Iverson, and R.A. Mittermeier, Eds. Chelonian Research Monographs (ISSN 1088-7105) No. 5, doi:10.3854/crm.5.051.ernsti.v1.2011 © 2011 by Chelonian Research Foundation • Published 31 December 2011
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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
Chelonian Conservation and Biology, 2010Co-Authors: Joshua R. Ennen, Jeffrey E. Lovich, Brian R. Kreiser, Will Selman, Carl P. QuallsAbstract:Abstract Cryptic or undescribed species pose a major problem in conservation biology. Managing multiple unresolved taxa collectively as a single entity could precipitate the loss of unrecognized genetic variation and unique populations and, possibly, lead to extinction of undiscovered or unrecognized taxa. In contrast to other species in its clade, the Pascagoula map turtle (Graptemys gibbonsi), as currently recognized, is not confined to a single major river system (or a cluster formed by a major river and adjacent minor drainages) but occurs in two major river systems, the Pearl and Pascagoula Rivers. We analyzed G. gibbonsi samples from both rivers for the first time in a morphological and molecular assessment of the taxonomic status of this poorly studied species. We compared the extent of genetic differentiation (mitochondrial DNA; mtDNA) between G. gibbonsi populations with members within the pulchra clade and between Graptemys oculifera and Graptemys flavimaculata. We found significant carapace pat...
Barbour, Roger W. - One of the best experts on this subject based on the ideXlab platform.
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Graptemys flavimaculata
Scholarworks @ Morehead State, 2018Co-Authors: Barbour, Roger W.Abstract:Graptemys flavimaculatahttps://scholarworks.moreheadstate.edu/roger_barbour_slide_collection/1691/thumbnail.jp
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Graptemys versa
Scholarworks @ Morehead State, 2018Co-Authors: Barbour, Roger W.Abstract:Graptemys versahttps://scholarworks.moreheadstate.edu/roger_barbour_slide_collection/1714/thumbnail.jp
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Graptemys pseudogeographica
Scholarworks @ Morehead State, 2018Co-Authors: Barbour, Roger W.Abstract:Graptemys pseudogeographicahttps://scholarworks.moreheadstate.edu/roger_barbour_slide_collection/1708/thumbnail.jp
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Graptemys barbouri
Scholarworks @ Morehead State, 2018Co-Authors: Barbour, Roger W.Abstract:Graptemys barbourihttps://scholarworks.moreheadstate.edu/roger_barbour_slide_collection/1683/thumbnail.jp
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Graptemys ouachitensis
Scholarworks @ Morehead State, 2018Co-Authors: Barbour, Roger W.Abstract:Graptemys ouachitensishttps://scholarworks.moreheadstate.edu/roger_barbour_slide_collection/1704/thumbnail.jp
Will Selman - One of the best experts on this subject based on the ideXlab platform.
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Population Structure, Status, and Conservation of Two Graptemys Species from the Pearl River, Mississippi
Journal of Herpetology, 2017Co-Authors: Will Selman, Robert L. JonesAbstract:Abstract Graptemys is one of the least studied turtle genera in North America. Graptemys oculifera (Ringed Sawback) and Graptemys pearlensis (Pearl Map Turtle) are endemic to the Pearl River system of Mississippi and southeastern Louisiana. We studied both species near Columbia, Mississippi, on the Pearl River via a trapping and basking surveys over two years. Additionally, five sites including Columbia were trapped for 27 years to determine long-term trends in capture success and relative abundance (RA). At the Columbia site, body size distribution was bimodal for G. oculifera and atypically unimodal for G. pearlensis; G. pearlensis body lengths were smaller than museum specimens. Population estimates for G. oculifera at the Columbia site indicate a stable population over 25 years. Long-term RA trends indicated that G. pearlensis was less common than G. oculifera in all periods and at all sites from 1988 to 2013. Trends in long-term capture success for G. oculifera and G. pearlensis were negative at all ...
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Diagnostic Trait Variability in the Imperiled Freshwater Turtle, Graptemys flavimaculata
Herpetologica, 2017Co-Authors: Will SelmanAbstract:Abstract: Considerable difficulty has been associated with the taxonomy of the genus Graptemys (Map Turtles and Sawbacks) over the last 50 yr, likely attributable to the relatively recent divergence of lineages and morphological variation within species. One trait that has been inconsistently defined has been the costal scute pattern of Graptemys flavimaculata, with many authors describing various blotch or ring patterns, or both. This study seeks to describe and quantify costal scute pattern via ring presence throughout the range of G. flavimaculata using both contemporary (field-captured) and historical (museum specimen) sources. Comparisons were made for contemporary individuals and historical specimens of both sexes throughout the geographic range. The pattern of all blotches dominated both sources (89.8%), whereas historical specimens had a higher rate of ring presence (15.1%) compared with contemporary individuals (8.6%). For contemporary data, ring presence was lower in headwater reaches (4.1–4.8%...
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Habitat-Related Variation in Body Size and Reproductive Output and an Examination of Reproductive Allometry in the Sabine Map Turtle (Graptemys sabinensis) across Three River Drainages
Copeia, 2016Co-Authors: Amy K. Fehrenbach, Will Selman, Irvin Louque, Stacy L. Mcfadden, Cybil C. Huntzinger, Eddie K. Lyons, Stephen H. Shively, Peter V. LindemanAbstract:The Sabine Map Turtle (Graptemys sabinensis) inhabits the Sabine-Neches, Calcasieu, and Mermentau river drainages of southwestern Louisiana and east Texas. Sparse data in the literature mark it as having among the smallest body sizes and smallest clutch sizes among the 14 species of the genus Graptemys. All available data on life history originate from the upper Sabine and upper Calcasieu drainages, which are relatively high-gradient rivers with fast currents and numerous sandbars. Downstream segments of these drainages and the entire Mermentau drainage have almost no gradient, with little perceptible current and no sandbars. We sampled G. sabinensis from the Mermentau River and upper and lower portions of both the Sabine and Calcasieu drainages. We collected data on body size and radiographed gravid females in the lower Calcasieu and Mermentau drainages to examine clutch size and egg width and compared our data to literature records and measurements of museum specimens. Both males (to 104 mm in midline p...
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High Connectivity Observed in Populations of Ringed Sawbacks, Graptemys oculifera, in the Pearl and Bogue Chitto Rivers Using Six Microsatellite Loci
Copeia, 2015Co-Authors: Daniel L. Gaillard, Brian R. Kreiser, Will Selman, Carl P. Qualls, Robert L. Jones, Keri LandryAbstract:Graptemys oculifera is endemic to the Pearl River drainage system in Louisiana and Mississippi, and due to this limited range it is vulnerable to environmental changes. Many impacts to this drainage system are due to anthropogenic activities, and alterations may negatively impact the connectivity among populations of G. oculifera. Previous studies show populations below the Ross Barnett Reservoir might be undergoing population declines, suggesting limited movement among populations. In addition to anthropogenic effects, the drainage geomorphology might also play a role in shaping population connectivity, as the sister species of G. oculifera, G. flavimaculata, contains two distinct populations (mainstem Pascagoula and Escatawpa River) and possible subpopulations within the Pascagoula (upper Leaf River, upper Chickasawhay River, and lower sections of the Pascagoula River). We used six polymorphic microsatellite loci to analyze the population genetics of G. oculifera at eight sites in the Pearl River draina...
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Seasonal Variation of Corticosterone Levels in Graptemys flavimaculata, an Imperiled Freshwater Turtle
Copeia, 2012Co-Authors: Will Selman, Jodie M. Jawor, Carl P. QuallsAbstract:Currently, little is known about the seasonal variation of corticosterone (CORT) levels, either baseline or stress response, within freshwater turtles. We conducted a seasonal CORT study with a species of freshwater turtle, Graptemys flavimaculata (Yellow-blotched Sawback; family Emydidae), that is endemic to the Pascagoula River system of southeastern Mississippi. Graptemys flavimaculata is commonly observed while basking on deadwood snags, with us using basking traps and dip nets as active capture methods. We caught both male (n = 60) and female (n = 49) turtles during the months of April–October during 2007 and 2008. Immediately after capture, we collected an initial blood sample, confined the turtle for 35 minutes, and then took a second blood sample. Competitive binding radioimmunoassays were done to determine CORT levels. Time zero CORT levels for both sexes were generally lower than previously reported levels for other turtle species, likely due to the trapping methods used. By time 35 min, COR...
Joshua R. Ennen - One of the best experts on this subject based on the ideXlab platform.
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Intersexual allometry differences and ontogenetic shifts of coloration patterns in two aquatic turtles, Graptemys oculifera and Graptemys flavimaculata
Ecology and evolution, 2015Co-Authors: Joshua R. Ennen, Peter V. Lindeman, Jeffrey E. LovichAbstract:Coloration can play critical roles in a species' biology. The allometry of color patterns may be useful for elucidating the evolutionary mechanisms responsible for shaping the traits. We measured characteristics relating to eight aspects of color patterns from Graptemys oculifera and G. flavimaculata to investigate the allometric differences among male, female, and unsexed juvenile specimens. Additionally, we investigated ontogenetic shifts by incorporating the unsexed juveniles into the male and female datasets. In general, male color traits were isometric (i.e., color scaled with body size), while females and juvenile color traits were hypoallometric, growing in size more slowly than the increase in body size. When we included unsexed juveniles in our male and female datasets, our linear regression analyses found all relationships to be hypoallometric and our model selection analysis found support for nonlinear models describing the relationship between body size and color patterns, suggestive of an ontogenetic shift in coloration traits for both sexes at maturity. Although color is critical for many species' biology and therefore under strong selective pressure in many other species, our results are likely explained by an epiphenomenon related to the different selection pressures on body size and growth rates between juveniles and adults and less attributable to the evolution of color patterns themselves.
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Hybridization of Two Megacephalic Map Turtles (Testudines: Emydidae: Graptemys) in the Choctawhatchee River Drainage of Alabama and Florida
Copeia, 2014Co-Authors: James C. Godwin, Jeffrey E. Lovich, Joshua R. Ennen, Brian R. Kreiser, Brian Folt, Chris LechowiczAbstract:Map turtles of the genus Graptemys are highly aquatic and rarely undergo terrestrial movements, and limited dispersal among drainages has been hypothesized to drive drainage-specific endemism and high species richness of this group in the southeastern United States. Until recently, two members of the megacephalic “pulchra clade,” Graptemys barbouri and Graptemys ernsti, were presumed to be allopatric with a gap in both species' ranges in the Choctawhatchee River drainage. In this paper, we analyzed variation in morphology (head and shell patterns) and genetics (mitochondrial DNA and microsatellite loci) from G. barbouri, G. ernsti, and Graptemys sp. collected from the Choctawhatchee River drainage, and we document the syntopic occurrence of those species and back-crossed individuals of mixed ancestry in the Choctawhatchee River drainage. Our results provide a first counter-example to the pattern of drainage-specific endemism in megacephalic Graptemys. Geologic events associated with Pliocene and Pleistoce...
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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
Chelonian Conservation and Biology, 2010Co-Authors: Joshua R. Ennen, Jeffrey E. Lovich, Brian R. Kreiser, Will Selman, Carl P. QuallsAbstract:Abstract Cryptic or undescribed species pose a major problem in conservation biology. Managing multiple unresolved taxa collectively as a single entity could precipitate the loss of unrecognized genetic variation and unique populations and, possibly, lead to extinction of undiscovered or unrecognized taxa. In contrast to other species in its clade, the Pascagoula map turtle (Graptemys gibbonsi), as currently recognized, is not confined to a single major river system (or a cluster formed by a major river and adjacent minor drainages) but occurs in two major river systems, the Pearl and Pascagoula Rivers. We analyzed G. gibbonsi samples from both rivers for the first time in a morphological and molecular assessment of the taxonomic status of this poorly studied species. We compared the extent of genetic differentiation (mitochondrial DNA; mtDNA) between G. gibbonsi populations with members within the pulchra clade and between Graptemys oculifera and Graptemys flavimaculata. We found significant carapace pat...
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Morphological and Molecular Reassessment of Graptemys oculifera and Graptemys flavimaculata (Testudines: Emydidae)
Journal of Herpetology, 2010Co-Authors: Joshua R. Ennen, Brian R. Kreiser, Carl P. Qualls, Jeffrey E. LovichAbstract:The turtle genus Graptemys consists of 15 recognized taxa, distinguished largely on the basis of pigmentation pattern (i.e., soft tissue and shell), head size, and shell morphology. However, phylogenetic studies have shown limited sequence divergence within the genus and between Graptemys oculifera and Graptemys flavimaculata relative to most other members of the Emydidae. Graptemys oculifera of the Pearl River drainage and G. flavimaculata of the Pascagoula River drainage have been recognized as species since 1890 and 1954, respectively. However, the description of G. flavimaculata was based on a limited number of morphological characters. Several of these characters overlap between G. flavimaculata and G. oculifera, and no attempt was made to test for significant morphological differentiation. In this study, we reevaluated the morphological and genetic distinctiveness of G. flavimaculata and G. oculifera with (1) multivariate statistical analyses of 44 morphological characters and (2) 1,560 bp of sequence data from two mitochondrial genes (control region and ND4). The morphological and molecular analyses produced incongruent results. The principal components analysis ordinations separated the two species along a pigmentation gradient with G. flavimaculata having more yellow pigmentation than G. oculifera. Likewise, clustering analyses separated the specimens into two distinct groups with little overlap between the species. Our mitochondrial data supported previous findings of limited genetic differentiation between the two species. However, the results of our morphological analyses, in conjunction with recently published nuclear gene sequence data, support the continued recognition of the two species.
