Diversity in the scutes of Chelonia

Coker, R. E.

doi:10.1002/jmor.1050210102

Cited by 32 publications

(39 citation statements)

References 3 publications

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“…Coker (1910) noted a similar tendency in Malaclemys and Lynn (1937) noted the same trend in Terrapene carolina. All gross anomalies had their maximum expression in the posterior region.…”

Section: Anomalies and Plate Variationsmentioning

confidence: 57%

The Life History of the Slider Turtle, Pseudemys scripta troostii (Holbrook)

Cagle¹

1950

Ecological Monographs

227

135

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“…Coker (1910) noted a similar tendency in Malaclemys and Lynn (1937) noted the same trend in Terrapene carolina. All gross anomalies had their maximum expression in the posterior region.…”

Section: Anomalies and Plate Variationsmentioning

confidence: 57%

The Life History of the Slider Turtle, Pseudemys scripta troostii (Holbrook)

Cagle¹

1950

Ecological Monographs

227

135

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“…Many turtles show anomalous intra-species variation, including supernumerary and fused scutes (Coker, 1910;Yntema, 1970). Some of our embryos show anomalous patterns in the distribution of scute primordia (as shown by Bmp2 expression; Fig.…”

Section: Testing the Model On Scute Patterningmentioning

confidence: 75%

“…Scute anomalies have been attributed to mechanical stresses (Yntema, 1970), such as those produced by desiccation (Coker, 1910), high temperature (Gardner Lynn and Ullrich, 1950) and environmental pollution (Bujes and Verrastro, 2007). Based on the simulation experiments of our computational model (Fig.…”

Section: Discussionmentioning

confidence: 97%

The origin and loss of periodic patterning in the turtle shell

et al. 2014

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The origin of the turtle shell over 200 million years ago greatly modified the amniote body plan, and the morphological plasticity of the shell has promoted the adaptive radiation of turtles. The shell, comprising a dorsal carapace and a ventral plastron, is a layered structure formed by basal endochondral axial skeletal elements (ribs, vertebrae) and plates of bone, which are overlain by keratinous ectodermal scutes. Studies of turtle development have mostly focused on the bones of the shell; however, the genetic regulation of the epidermal scutes has not been investigated. Here, we show that scutes develop from an array of patterned placodes and that these placodes are absent from a softshelled turtle in which scutes were lost secondarily. Experimentally inhibiting Shh, Bmp or Fgf signaling results in the disruption of the placodal pattern. Finally, a computational model is used to show how two coupled reaction-diffusion systems reproduce both natural and abnormal variation in turtle scutes. Taken together, these placodal signaling centers are likely to represent developmental modules that are responsible for the evolution of scutes in turtles, and the regulation of these centers has allowed for the diversification of the turtle shell.

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“…COKER (1910) was the first author to question that these anomalies are a result of mutations in the embryogenesis, an idea that later on was supported by other investigators (LYNN 1937, LYNN & ULLRICH 1950, FRYE 1991.…”

mentioning

confidence: 72%

Supernumerary epidermal shields and carapace variation in Orbigny's slider turtles, Trachemys dorbigni (Testudines, Emydidae)

Bujes

Verrastro

2007

Rev. Bras. Zool.

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The epidermal plates of the carapace and plastron of 51 adults (38 females and 13 males), 07 immature individuals, and 46 hatchlings of the freshwater turtle Trachemys dorbigni (Durémil & Bibron, 1835), originated from the delta of Rio Jacuí region, Rio Grande do Sul state, Brazil, were examined. The results showed that 7.7% of males, 10.52% of females, 14.28% of immature individuals, and 6.52% of the hatchlings presented a kind of anomaly on the shell, as well as a presence of supernumerary epidermal shields. Although the modification in the number of epidermal shields presents a high frequency in Testudines, these are the first descriptions of the variation in the pattern of carapacial scutation in eleven individuals from a population of T. dorbigni. The association of several environmental factors acting on the embryonic development of the individual may be responsible for the alteration of the pattern of carapacial scutation in this species.

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Diversity in the scutes of Chelonia

Cited by 32 publications

References 3 publications

The Life History of the Slider Turtle, Pseudemys scripta troostii (Holbrook)

The Life History of the Slider Turtle, Pseudemys scripta troostii (Holbrook)

The origin and loss of periodic patterning in the turtle shell

Supernumerary epidermal shields and carapace variation in Orbigny's slider turtles, Trachemys dorbigni (Testudines, Emydidae)

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