Skeletogenesis in problematic Late Proterozoic Lower Metazoa

Serezhnikova, E. A.

doi:10.1134/s0031030114140123

Cited by 6 publications

(2 citation statements)

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“…The exoskeleton in Cnidaria occurred at least since the Ediacaran (~635–551 Mya; Liu et al ., ; Xiao, Yuan & Knoll, ; Leme et al ., ; Van Iten et al ., ; Pacheco et al ., ), concomitant with the radiation of other animal groups also capable of building exoskeletons (Xiao & Laflamme, ) or support systems based on aggregated mineral particles (Serezhnikova, ), which then continued taxonomically and geologically during the Cambrian (Vermeij, ; Van Iten et al ., , ). The oldest exoskeletal fossils of metazoans already documented include the conical calcitic shells of Cloudina , a problematic genus that is now considered a cnidarian (Vinn & Zatón, ); the chitinous and tubular annulated polyps of scyphozoa Olivooides (Zhao & Bengtson, ; Dong et al ., ; Yasui et al ., ); the late Ediacaran chitin‐mineralized fossil Corumbella (Pacheco et al ., ); and the possibly mineralized phosphate type of Conulatae scyphozoans (Leme et al ., ; Van Iten et al ., ).…”

Section: The Exoskeleton In Medusozoamentioning

confidence: 99%

An evolutionary comparative analysis of the medusozoan (Cnidaria) exoskeleton

et al. 2016

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The benthic polyp phase of Medusozoa (Staurozoa, Cubozoa, Scyphozoa, and Hydrozoa) has endoskeletal or exoskeletal support systems, but their composition, development, and evolution is poorly known. In this contribution the variation in synthesis, structure, and function of the medusozoan exoskeleton was examined. In addition, an evolutionary hypothesis for its origin and diversification is proposed for both extinct and extant medusozoans. We also critically reviewed the literature and included data from our own histological and microstructural analyses of some groups. Chitin is a characteristic component of exoskeleton in Medusozoa, functioning as support, protection, and a reserve for various ions and inorganic and organic molecules, which may persuade biomineralization, resulting in rigid biomineralized exoskeletons. Skeletogenesis in Medusozoa dates back to the Ediacaran, when potentially synergetic biotic, abiotic, and physiological processes resulted in development of rigid structures that became the exoskeleton. Of the many types of exoskeletons that evolved, the corneous (chitin-protein) exoskeleton predominates today in polyps of medusozoans, with its greatest variation and complexity in the polyps of Hydroidolina. A new type of bilayered exoskeleton in which there is an exosarc complementing the perisarc construction is here described.

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Section: The Exoskeleton In Medusozoamentioning

confidence: 99%

An evolutionary comparative analysis of the medusozoan (Cnidaria) exoskeleton

et al. 2016

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“…The exoskeleton in Cnidaria occurred at least since the Ediacaran (~635-551 Myr) (Liu et al, 2008;Xiao, Yuan & Knoll, 2010;Leme et al, 2013;Van Iten et al, 2013a;Pacheco et al, 2015), concomitant with the radiation of other animal groups also capable of building exoskeletons (Xiao & Laflamme, 2008) or support systems based on aggregated mineral particles (Serezhnikova, 2014), which then continued taxonomically and geologically during the Cambrian (Vermeij, 1989;. The oldest exoskeletal fossils of metazoans already documented include the conical calcitic shells of Cloudina, a problematic genus that is now considered a cnidarian (Vinn & Zatón, 2012); the tubular annulated and assigned as chitinous scyphozoan polyps of Olivooides (Zhao & Bengtson, 1999;Dong et al, 2013;Yasui et al, 2013); the late Ediacaran chitin-mineralized fossil Corumbella (Pacheco et al, 2015); and the possible mineralized phosphate type of Conulatae scyphozoans (Leme et al, 2013;Van Iten et al, 2013a).…”

Section: Fossil Recordsmentioning

confidence: 99%

Padrões de diversificação de Bougainvilliidae no contexto evolutivo de Medusozoa (Cnidaria)

Mendoza-Becerril¹

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No caminho tive o privilegio de contar com o apoio de pessoas maravilhosas. Juntos formaram o tecido forte da coberta que me protegeu nesta fase da minha vida e que com certeza continuará abrigando-me, cada qual com sua linha: saúde, amor, família, amizade, esporte, arte, cultura, literatura, trabalho e pesquisa. Obrigado infinitamente por cada fio que entrelaçaram uns com outros a cada encontro e a cada partida. Ao Prof. Dr. Antonio Carlos Marques, pelo incentivo e ensinamento constante ao decorrer deste trabalho, principalmente pela oportunidade e a confiança que depositou em mim. Ao Prof. Dr. José Marian, pelo apoio, conselhos, ensinamento e discussões sobre este trabalho. Prof. Dr. Álvaro Migotto, pelas sugestões e por compartilhar sua vasta experiência e paixão pelos Medusozoa. Prof. Dr. André Morandini pela ajuda e fornecimento de material neste estudo. Dra. Thaís Miranda e M.Sc. em Ciências Biológicas Amanda Cunha pela amizade, apoio, presença e participação ativa neste trabalho. Rafaela Flores, Manuel J. Antunes, Phillip Lenktaitis e Enio Mattos pelo constante apoio e por compartilhar seu inestimável conhecimento adquirido através da vivência. A todos os professores que encontrei no meu caminho académico, pois cada um incentivou-me a prosseguir. A todos os funcionários do Instituto de Biociências, do Centro de Biologia Marinha da Universidade de São Paulo e da Biblioteca do Instituto Oceanográfico pelo apoio e colaboração. Aos funcionários do Hospital Universitário, por me tornar possível a conclusão deste trabalho. À CAPES, PROEX, CNPq, FAPESP pelo apoio econômico, mas principalmente a todos vocês e ao resto do povo brasileiro. Aos colegas e ex-colegas do Laboratório de Evolução Marinha (LEM): Max Maronna,

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