Sequência de ossificação do sincrânio e hioide em embriões de Caiman yacare (Crocodylia, Alligatoridae)

Lima, Fabiano Campos; Santos, André Luíz Quagliatto; Vieira, Lucélia Gonçalves; Coutinho, Marcos Eduardo

doi:10.1590/s0073-47212011000200003

Cited by 7 publications

(5 citation statements)

References 36 publications

(23 reference statements)

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“…These rapid evolutionary changes of the braincase in basal crocodylomorphs must have resulted from profound developmental rearrangements in the chondrocranium. Although we cannot examine the developmental sequence in early lineages of crocodylomorphs, the embryonic development of the skull in extant crocodylians has been studied in sufficient detail (Bellairs & Kamal, 1981;Fernandez Blanco, 2019;Kesteven, 1957;Klembara, 1991Klembara, , 1993Klembara, , 2001Klembara, , 2004Klembara, , 2005Lima et al, 2011;Müller, 1967;Parker, 1883;Rieppel, 1993;Shiino, 1914;Vieira et al, 2019). This work may provide us with important clues concerning the developmental mechanisms that underlie the evolutionary acquisition of the characteristic braincase anatomy of crocodylomorphs.…”

Section: Comparison Of the Braincase Anatomy Of Extant Crocodylians: Inferences Of New Potentially Phylogenetically Informative Charactermentioning

confidence: 99%

Braincase anatomy of extant Crocodylia, with new insights into the development and evolution of the neurocranium in crocodylomorphs

et al. 2021

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Section: Comparison Of the Braincase Anatomy Of Extant Crocodylians: Inferences Of New Potentially Phylogenetically Informative Charactermentioning

confidence: 99%

Braincase anatomy of extant Crocodylia, with new insights into the development and evolution of the neurocranium in crocodylomorphs

et al. 2021

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“…É interessante ressaltar, que em A. mississippiensis (Rieppel 1993b) e C. yacare (Lima et al 2011b) o parietal se desenvolve com dois centros de ossificação, localizados em ambos os antímeros. Uma fontanela mantém estes elementos separados durante todo o período pré-natal.…”

Section: Crâniounclassified

Osteologia de Melanosuchus niger (Crocodylia: Alligatoridae) e a evidência evolutiva

et al. 2016

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RESUMO.-O objetivo foi realizar a descrição anatômica do esqueleto de Melanosuchus niger, com o intuito de contribuir com informações evolutivas sobre a espécie. Utilizaram-se três espécimes adultos de M. niger, com comprimento médio de 2,40m, provenientes da coleção biológica do Lapas-UFU. Na cintura peitoral, a escápula é maior do que o coracóide. Já nos elementos da cintura pelvina, o púbis não participa da formação do acetábulo, o contato com o ilío, ocorre por ligamentos, e sua articulação com o ísquio, permite movimentos dorso-ventrais. The objective was an anatomical description of the skeleton of Melanosuchus niger, in order to contribute with evolutionary information about the species. Three adult specimens of M. niger with an average length of 2.40m were used, originating from the biologic collection of Lapas-UFU. In the forelimb, the scapula is bigger than the coracoid. Regarding the hindlimbs, the pubic does not participate in the formation of the acetabulum; the contact with the ilium is made by ligaments, and its articulation with the rump allows dorsal-ventral movements. Regarding the forelimbs, the humerus is a stylopodium element, and the ulna and radius a zeugopodium element. The carpus exibits the ulnar-radial+intermedium fusion, fusion of the distal carpals 3+4+5, and the pisiform. It has five metacarpals, numbered lateromedially as metacarpal 1, 2, 3, 4, and 5. The phalangeal formula is 2:3:4:3:2. Regarding the pelvic limbs, the stylopodium is formed by the femur, and the zeugopodium by tibia and fibula. In tarsus has four bones: fusion of the intermedium+centrale, fibulare, distal tarsal 3, and distal tarsal 4. It has four long metatarsals I, II, III and IV, with metatarsal II and III being relatively longer than the others. Metatarsal V is a very small bone; the feet have the phalangeal formula 2:3:4:4. At the skull, the nasal opening is only the palatine bones, vomer, pterygoid, premaxilla and maxilla forming the bone structure of the secondary palate; the parietal bone is the only element on the cranial roof. In the pos-axial skeleton ist distinct pairs of ribs which articulate with the cervical, dorsal, lumbar, sacral and caudal vertebrae. The gastralia consists of seven rows of fine bone located between the pubic bone and caudal part of the sternum.

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“…The Pantanal Caiman belongs to the phylum Chordata, class Reptilia, subclass Archosauria, order Crocodylia, family Alligatoridae, genus Caiman, and species Caiman yacare (Azevedo, 2003;Marques, 2007;Lima et al, 2011a). They are generally distributed throughout Brazil, particularly in Este estudo objetivou avaliar os efeitos da temperatura e motilidade embrionária sobre o desenvolvimento esquelético de jacaré-do-pantanal (Caiman yacare).…”

Section: Introductionunclassified

Influence of incubation temperature and embryonic motility on the growth of members of Caiman yacare (Daudin, 1802)

et al. 2024

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This study aimed to evaluate whether skeletal development of the Pantanal Caiman (Caiman yacare) is similarly influenced by temperature variation and controlled increases in embryo motility. All eggs were incubated at 90% humidity and 29 °C for the first 45 days. Thereafter, the incubation temperature was either maintained at 29 °C and embryos were treated with 4-aminopyridine (4-AP) on days 46, 47, 48, and 49 (Group I, 29 °C 4-AP, n = 15); maintained at 29 °C (n = 14; Group II); or at 33 °C (n = 14, Group III). Embryonic movement was measured using an Egg Buddy® digital monitor on days 30, 35, 42, 49, 56, and 60, at which point embryos were euthanized and samples were collected for analysis. No differences were observed between groups with varying incubation temperatures. In contrast, embryonic motility was greater in embryos treated with 4-AP (P < 0.001) on day 49, and this was associated with higher proportions of snout-vent and hand lengths. This study demonstrates for the first time that pharmacologically induced increases in embryo motility result in phenotypic changes to the proportion of elements during prenatal ontogeny, thereby effectively altering the adaptation of the species to specific environments.

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Sequência de ossificação do sincrânio e hioide em embriões de Caiman yacare (Crocodylia, Alligatoridae)

Cited by 7 publications

References 36 publications

Braincase anatomy of extant Crocodylia, with new insights into the development and evolution of the neurocranium in crocodylomorphs

Braincase anatomy of extant Crocodylia, with new insights into the development and evolution of the neurocranium in crocodylomorphs

Osteologia de Melanosuchus niger (Crocodylia: Alligatoridae) e a evidência evolutiva

Influence of incubation temperature and embryonic motility on the growth of members of Caiman yacare (Daudin, 1802)

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