Stupendemys souzai sp. nov. (Pleurodira, Podocnemididae) from the Miocene-Pliocene of the Solimões Formation, Brazil

Bocquentin, Jean

doi:10.4072/rbp.2006.2.02

Cited by 20 publications

(9 citation statements)

References 12 publications

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“…For example, two of the smallest extant turtles, Homopus signatus [maximum carapace length (MaxCL) 9.5 cm; adult mass 140–160 g] and Glyptemys muhlenbergii (MaxCL 11.5 cm, mass 85–150 g), are an order of magnitude smaller in linear dimensions and three orders of magnitude smaller in mass than the largest extant terrestrial turtle ( Chelonoidis nigra ; MaxCL 130 cm, mass up to 300 kg) and approximately 20 times smaller in linear dimensions and nearly four orders of magnitude smaller in mass than the largest extant turtle ( Dermochelys coriacea ; MaxCL 245 cm, mass up to 916 kg) (measurements from Arndt, ; Boycott & Bourquin, ; Ernst & Barbour, ; Bonin, Devaux & Dupré, ; Ernst & Lovich, ). This contrast in sizes is even more dramatic when we include fossil turtles such as Stupendemys geographica (MaxCL 318–330 cm; Bocquentin & Melo, ; Scheyer & Sanchez‐Villagra, ), which was approximately 30 times larger in linear dimensions than the diminutive G. muhlenbergii and H. signatus .…”

Section: Introductionmentioning

confidence: 99%

Are diminutive turtles miniaturized? The ontogeny of plastron shape in emydine turtles

Angielczyk

Feldman

2013

Biol J Linn Soc Lond

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Miniaturization, or the evolution of a dramatically reduced body size compared to related lineages, is an extraordinarily widespread phenomenon among metazoans. Evolutionary biologists have been fascinated by miniaturization because this transition has occurred numerous times, often among close relatives, providing a model system for studying convergent evolution and its underlying mechanisms. Much of the developmental work describing the ontogeny of miniature species suggests that paedomorphosis is the predominant avenue of miniaturization. Nevertheless, specific alterations to ontogeny appear highly variable, so that even related lineages with similar miniaturized traits produce those similarities via distinct ontogenetic paths. One major vertebrate group that has been overlooked in research on miniaturization is turtles. In the present study, we examined patterns of shape change in the plastron (the ventral part of the shell) over the course of ontogeny in a small clade of turtles (Emydinae) aiming to investigate whether two independently evolved diminutive members of the clade (Glyptemys muhlenbergii and Clemmys guttata) should be considered as miniaturized. We employ geometric morphometric methods to quantify the patterns of shape change these potentially miniaturized species and their relatives undergo during ontogeny, and use molecular phylogenetic trees to reconstruct ancestral conditions and provide information on the polarity of shape changes. We find that differing changes in ontogenetic parameters relative to ancestral conditions accompany the evolution of small size in emydines: G. muhlenbergii changes the duration of ontogeny and rate of shape change, whereas C. guttata changes growth rate. The observed ontogenetic repatterning of these species is reminiscent of changes in ontogeny and life history often found in miniaturized taxa. However, we conclude that C. guttata and G. muhlenbergii are not truly miniaturized because they still produce typical adult shell morphologies, and larger emydines display comparable ontogenetic flexibility. Because no emydines carry juvenile shell features forward into adulthood, we speculate that few, if any turtles, will show paedomorphic shell traits without corresponding changes in defensive strategy because such shells may offer insufficient protection. © 2013 The Linnean Society of London

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Section: Introductionmentioning

confidence: 99%

Are diminutive turtles miniaturized? The ontogeny of plastron shape in emydine turtles

Angielczyk

Feldman

2013

Biol J Linn Soc Lond

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“…For maps and localities of isolated skeletal elements referred to cf. Stupendemys, Stupendemys sp., and Stupendemys souzai from the southwestern Amazonian region (i.e., Alto Rio Acre, Rio Alto Purus, Rio Alto Jurua), see Lapparent de Broin et al (1993), Bocquentin and Negri (1993), Gaffney et al (1998), and Bocquentin and Melo (2006).…”

Section: Introductionmentioning

confidence: 99%

“…There is no mention of DNPM-MCT 1496-R in Lapparent de Broin's (2000) assignment of Stupendemys to the subfamily Podocnemidinae. Bocquentin and Melo (2006) included the three isolated elements described by Lapparent de Broin et al (1993), the two isolated vertebrae described by Bocquentin and Negri (1993), and six other isolated elements in their hypodigm of a new species, Stupendemys souzai. They did not mention DNPM-MCT 1496-R.…”

Section: Introductionmentioning

confidence: 99%

Caninemys, A New Side-Necked Turtle (Pelomedusoides: Podocnemididae) from The Miocene of Brazil

Meylan¹,

Gaffney²,

Campos³

2009

American Museum Novitates

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A new genus and species of podocnemidid pleurodire, Caninemys tridentata, is described on the basis of a skull collected by L.I. Price in 1962 from the late Miocene of Acre, Brazil. It is unique among podocnemidids (and all other turtles) in having greatly inflated maxillae, each with a ventral, toothlike process. Along with a midline process of the premaxillae, these processes form a tridentate condition in the upper triturating surface, also unique among podocnemidids but comparable to the condition in the kinosternid Claudius. This skull has previously been identified as the shell-based genus Stupendemys, but there are no associations supporting this assignment. The type specimens are separated by over 2000 km, and other large podocnemidid taxa are known from this time and region. Although relatively large with a condylobasal skull length of about 17 cm, Caninemys was probably about half the size of Stupendemys. Phylogenetic analysis of 63 skeletal characters provides evidence that this new taxon nests within the family Podocnemididae as follows: (Bauruemys (''Roxochelys'' (Podocnemis (Caninemys (Dacquemys ((Erymnochelys, Peltocephalus) (Neochelys (Shweboemys, Stereogenys)))))))).

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“…Entretanto, exemplares de Stupendemys do Mioceno-Plioceno da Amazônia, Formação Solimões (de Broin et. al., 1993;Bocquentin & Melo, 2006) Bauruemys, a qual seria mais lógica a sua associação taxonômica.…”

Section: Discussionunclassified

“…Quelônios do clado Pelomedusoides são bastante comuns no Brasil (Gaffney et al, 2001;Oliveira & Kellner, 2005;Bocquentin & Melo, 2006;Gaffney et al, 2006;Meylan et. al., 2009 ) com fósseis predominantemente encontrados na Bacia Bauru assim como em outras localidades (Price, 1953;Suarez, 1969;França & Langer, 2005;Gaffney et.…”

Section: Discussionunclassified

Descrição osteológica e posicionamento taxonômico de microvertebrados fósseis do Cretáceo Superior (Bacia Bauru) afloramento "Tartaruguito", município de Pirapozinho (SP)

Rosa¹

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As ossadas são nossa única eternidadeMia Couto Agradecimentos Gostaria de começar agradecendo aos meus pais que me possibilitaram chegar onde estou, ao apoio do meu irmão e de toda minha família, sempre apoiando e suportanto todas as minhas decisões e escolhas . Agradecer ao meu orientador professor Hussam pela oportunidade e pela orientação e atenção durante o desenvolvimento deste trabalho, por me acrescentar principalmente crescimento profissional através de seus conselhos e dicas. A CAPES pela concessão da bolsa de mestrado durante o período de 2011 a 2013. Aos professores Sérgio Alex Azevedo e Luciana Barbosa do Museu Nacional no Rio de Janeiro por todo apoio e prestatividade durante a minha passagem pela cidade e pelo museu, não só liberando acesso aos materiais para observação, como todo a ajuda e atenção pessoal durante o período. Ao professor José Lima da seção de Ictiologia do Museu de Zoologia que me ajudou com todo o material de peixe, liberando acesso aos materiais, além das dicas de bibliografia para consulta. À professora Valéria Gallo meu muito obrigado também pois, foi bastante solicita e atenciosa quando precisei de seu auxílio. Obrigada a todos os funcionários da biblioteca, Dione e Marta que não medem esforços para nos ajudar a achar livros e artigos, por mais difícil que pareça elas sempre encontram. Ao Beto (Alberto) pela paciência, por todo auxílio, orientação, conselhos e apoios, tenho certeza que sem a sua ajuda e amizade, o caminho trilhado teria sido mais difícil. Obrigada pelas oportunidades, pelas risadas, piadas e toda a orientação e aprendizagem nos trabalhos de campo. Muito obrigada Beto! À todos os amigos do laboratório de Paleontologia, Pirula (Paulo Nascimento), Bruno, Natasha, Rosely, Natan, Rafael, Leandro, Wellton, Karla, Ana que me ajudaram, aguentaram minhas reclamações, dividimos momentos e risadas, a todos vocês obrigada pela amizade, pelo apoio sempre. Agradeço a todos que contribuíram para que este trabalho fosse executado e finalizado. Obrigada! i

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Stupendemys souzai sp. nov. (Pleurodira, Podocnemididae) from the Miocene-Pliocene of the Solimões Formation, Brazil

Cited by 20 publications

References 12 publications

Are diminutive turtles miniaturized? The ontogeny of plastron shape in emydine turtles

Are diminutive turtles miniaturized? The ontogeny of plastron shape in emydine turtles

Caninemys, A New Side-Necked Turtle (Pelomedusoides: Podocnemididae) from The Miocene of Brazil

Descrição osteológica e posicionamento taxonômico de microvertebrados fósseis do Cretáceo Superior (Bacia Bauru) afloramento "Tartaruguito", município de Pirapozinho (SP)

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