Embryonic development of the Giant South American River Turtle, Podocnemis expansa (Testudines: Podocnemididae)

Magalhães, Marcela dos Santos; Vogt, Richard C.; Sebben, Antonio; Dias, Lucas Castanhola; Oliveira, Moacir Franco de; Moura, Carlos Eduardo Bezerra de

doi:10.1007/s00435-017-0365-8

Cited by 14 publications

(12 citation statements)

References 21 publications

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“…The SES‐based staging system describes only homological characters commonly observed in vertebrates and allows quantification of the relative formation timing of these characters. A handful of studies to date have adopted SES‐based staging systems to explore developmental variations among distantly related species in sauropsids 32‐36 and mammals 37‐39 …”

Section: Introductionmentioning

confidence: 99%

Embryonic staging of bats with special reference to Vespertilio sinensis and its cochlear development

Nojiri

Fukui

Werneburg

et al. 2021

Developmental Dynamics

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Background How bats deviate heterochronically from other mammals remains largely unresolved, reflecting the lack of a quantitative staging framework allowing comparison among species. The standard event system (SES) is an embryonic staging system allowing quantitative detection of interspecific developmental variations. Here, the first SES‐based staging system for bats, using Asian parti‐colored bat (Vespertilio sinensis) is introduced. General aspects of normal embryonic development and the three‐dimensional development of the bat cochlea were described for the first time. Recoding the embryonic staging tables of 18 previously reported bat species and Mus musculus into the SES system, quantitative developmental comparisons were performed. Results It was found that limb bud development of V. sinensis is relatively late among 19 bat species and late limb development is a shared trait of vespertilionid bats. The inner ear cochlear canal forms before the semicircular canal in V. sinensis while the cochlear canal forms after the semicircular canal in non‐volant mammals. Conclusions The present approach using the SES system provides a powerful framework to detect the peculiarities of bat development. Incorporating the timing of gene expression patterns into the SES framework will further contribute to the understanding of the evolution of specialized features in bats.

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Section: Introductionmentioning

confidence: 99%

Embryonic staging of bats with special reference to Vespertilio sinensis and its cochlear development

Nojiri

Fukui

Werneburg

et al. 2021

Developmental Dynamics

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“…[21][22][23][24][25][26][27][28][29][30][31] Developmental staging systems have been described for members of several clades of turtles (Figure 1), including. [32][33][34][35][36][37][38][39][40][41][42][43] Here, we provide a comprehensive staging system for the mid to late embryonic development of the Stinkpot or Common musk turtle (Sternotherus odoratus), a North American turtle of the family Kinosternidae.…”

Section: Introductionmentioning

confidence: 99%

“…Their peculiar anatomy has made them the object of several embryological studies focusing on the development and evolution of the turtle shell, 1‐9 shoulder, 10‐12 head, 13 skull, 14‐20 and general skeletal development 21‐31 . Developmental staging systems have been described for members of several clades of turtles (Figure 1), including 32‐43 . Here, we provide a comprehensive staging system for the mid to late embryonic development of the Stinkpot or Common musk turtle ( Sternotherus odoratus ), a North American turtle of the family Kinosternidae.…”

Section: Introductionmentioning

confidence: 99%

A developmental staging system and musculoskeletal development sequence of the common musk turtle (Sternotherus odoratus)

Smith‐Paredes

Lord

Meyer

et al. 2020

Developmental Dynamics

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Background: The extremely derived body plan of turtles has sparked a great interest in studying their developmental biology. Here, we describe the embryonic development of the Stinkpot, or common musk turtle (Sternotherus odoratus), a small aquatic turtle from the family Kinosternidae. Results: We identify 20 distinct developmental stages, some comparable to stages described by previous studies on other turtles and some in between these, improving the resolution of the generalities of turtle development. We provide a detailed account of both the external morphology and skeletal development, as well as a general look at the early stages of muscular development until the attainment of the adult muscular anatomical pattern. Conclusions: Several potential skeletal and muscular apomorphies of turtles are identified or elaborated. The musk turtle, with its small size and hardshelled egg, could become an important species for the study of turtle evolution and development, suitable for in ovo experimentation and late stage imaging of well-advanced anatomical features.

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“…In newly hatched cubs the tail is the same size, still short and the plastron straight. Another important structure in sexual differentiation is the urogenital papilla, [14] describes that it is the precursor of the cloaca in the Amazon turtle The growth rates of vertebrate embryos are highly variable within and between species and depend on the incubation temperature [27]. The incubation temperature in uences its duration and the degree of development [28], at low temperatures they increase the time and decrease the rate of development, while at high temperature they decrease the duration and increase the rate of development [4,29,30,31].…”

Section: Discussionmentioning

confidence: 99%

“…Some species of the Testudines order had their embryonic stages determined Chelydra serpentina [8], Lepidochelys olivacea [10], Pelodiscus sinensis [11], Trachemys scripta [12], Emydura subglobosa [13], Podocnemis expansa [14]. However, the species K. scorpioides has an unprecedented biological description of the stages of embryonic development.…”

Section: Introductionmentioning

confidence: 99%

Stages of Embryonic Development of the Amazonian turtle Kinosternon Scorpioides (Testudines, Kinosternidae)

Chaves

Viana

Tchaika

et al. 2020

Preprint

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Background: The developmental biology of K. scorpioides is described, based on the phenotype. This species is important for the flora because they are excellent seed disseminators. In addition, basic embryological information is not yet fully clarified, and this research provides unprecedented information on the chelonian embryology of the Amazonian fauna. Methods: Females were monitored throughout the reproductive cycle, by video monitoring, to identify nests and the presence of newly laid eggs. At regular weekly intervals, embryo samples were collected fixed in a 4% paraformol solution and preserved in 70% alcohol. For the embryonic characterization we used a stereomicroscope and the scanning electron microscopy method. Results: We describe 15 embryonic stages for a 15-week (105-day) incubation cycle. Only at 42 days (6th week) was the morphological characterization of a chelonian observed and at the 12th week (Stage XII) the phenotypic characterization of the species kinosternon scorpioides. Conclusions: In view of the evidence, we found that these phases are similar to the other turtles, with structural variations in the appearance and disappearance of structures due to the specific characteristics for the species.

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Embryonic development of the Giant South American River Turtle, Podocnemis expansa (Testudines: Podocnemididae)

Cited by 14 publications

References 21 publications

Embryonic staging of bats with special reference to Vespertilio sinensis and its cochlear development

Embryonic staging of bats with special reference to Vespertilio sinensis and its cochlear development

A developmental staging system and musculoskeletal development sequence of the common musk turtle (Sternotherus odoratus)

Stages of Embryonic Development of the Amazonian turtle Kinosternon Scorpioides (Testudines, Kinosternidae)

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