{"id":3532,"date":"2025-09-06T15:39:15","date_gmt":"2025-09-06T18:39:15","guid":{"rendered":"https:\/\/overticeportal.com.br\/?p=3532"},"modified":"2025-09-06T15:39:17","modified_gmt":"2025-09-06T18:39:17","slug":"tubaroes-fantasmas-desenvolvem-dentes-na-testa-para-acasalamento","status":"publish","type":"post","link":"https:\/\/portalam9.com.br\/?p=3532","title":{"rendered":"Tubar\u00f5es fantasmas desenvolvem dentes na testa para acasalamento"},"content":{"rendered":"\n

Pesquisadores dos Estados Unidos desvendaram um dos mist\u00e9rios mais curiosos das quimeras, tamb\u00e9m conhecidas como tubar\u00f5es-fantasma. Esses peixes de \u00e1guas profundas, parentes de tubar\u00f5es e raias, possuem um ap\u00eandice na testa cheio de dentes retr\u00e1teis.<\/p>\n\n\n\n

O estudo publicado na revista\u00a0Proceedings of the National Academy of Science<\/a>s em 28 de julho, mostrou que os dentes n\u00e3o s\u00e3o apenas ornamentais, mas estruturas desenvolvidas fora da boca, provavelmente com fun\u00e7\u00e3o reprodutiva.<\/p>\n\n\n\n

O chamado ten\u00e1culo aparece apenas nos machos e parece servir para agarrar as f\u00eameas durante o acasalamento, de modo semelhante ao que os tubar\u00f5es fazem com suas bocas dentadas.<\/p>\n\n\n\n

\n

\u201cSe as quimeras conseguem produzir dentes fora da boca, onde mais poder\u00edamos encontr\u00e1-los?\u201d, questionou Gareth Fraser, professor de biologia da Universidade da Fl\u00f3rida e autor s\u00eanior do estudo, em comunicado.<\/p>\n<\/blockquote>\n\n\n\n

F\u00f3ssil antigo trouxe pistas<\/h2>\n\n\n\n

Para investigar a origem do ap\u00eandice, a equipe\u00a0analisou f\u00f3sseis\u00a0com 315 milh\u00f5es de anos e tamb\u00e9m esp\u00e9cimes vivos coletados na regi\u00e3o de Puget Sound, nos Estados Unidos. O material revelou que o ten\u00e1culo era originalmente ligado \u00e0 mand\u00edbula superior, exibindo dentes muito semelhantes aos da boca.<\/p>\n\n\n\n

Exames gen\u00e9ticos confirmaram que o crescimento dent\u00e1rio na testa segue o mesmo processo observado em dentes orais de tubar\u00f5es, refor\u00e7ando a ideia de que a capacidade de forma\u00e7\u00e3o dent\u00e1ria foi transferida para essa estrutura.<\/p>\n\n\n\n

\n

\u201cO que descobrimos \u00e9 que os dentes neste ap\u00eandice estranho se parecem muito com fileiras de\u00a0dentes de tubar\u00e3o. A capacidade de produzir dentes foi transferida da boca para o ten\u00e1culo\u201d, explicou Fraser.<\/p>\n<\/blockquote>\n\n\n

\n
\"Anatomia<\/figure>\n<\/div>\n\n\n

Evolu\u00e7\u00e3o com criatividade<\/h2>\n\n\n\n

Os cientistas destacam que se trata de um exemplo claro de como a evolu\u00e7\u00e3o pode reutilizar mecanismos biol\u00f3gicos em fun\u00e7\u00f5es inesperadas.<\/p>\n\n\n\n

\n

\u201cTemos uma combina\u00e7\u00e3o de dados experimentais com evid\u00eancias paleontol\u00f3gicas para mostrar como esses peixes se apropriaram de um programa preexistente de fabrica\u00e7\u00e3o de dentes para criar um novo dispositivo essencial para a reprodu\u00e7\u00e3o\u201d, afirmou Michael Coates, professor de biologia da Universidade de Chicago, que tamb\u00e9m participou do estudo.<\/p>\n<\/blockquote>\n\n\n\n

Segundo os pesquisadores, nunca havia sido descrita de forma t\u00e3o clara a presen\u00e7a de dentes fora da boca em vertebrados. Para Karly Cohen, pesquisadora da Universidade de Washington e primeira autora do artigo, o ten\u00e1culo \u201cn\u00e3o \u00e9 um caso isolado e bizarro, mas o primeiro exemplo claro de uma estrutura dentada fora da mand\u00edbula\u201d.<\/em><\/p>\n\n\n\n

O achado refor\u00e7a a diversidade de adapta\u00e7\u00f5es evolutivas encontradas em ambientes profundos e ainda pouco explorados. \u201cAinda h\u00e1 muitas surpresas nas\u00a0profundezas do oceano\u00a0que precisamos descobrir<\/em>\u201d, disse Fraser.<\/p>\n\n\n\n

Fonte: Metr\u00f3poles \/ <\/strong>Foto: Gareth J. Fraser\/Universidade da Fl\u00f3rida
<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

Pesquisa mostra que o ap\u00eandice dentado dos machos ajuda na reprodu\u00e7\u00e3o e revela pistas sobre a evolu\u00e7\u00e3o do desenvolvimento dos dentes<\/p>\n","protected":false},"author":3,"featured_media":3534,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"class_list":["post-3532","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-curiosidades-2"],"yoast_head":"\nTubar\u00f5es fantasmas desenvolvem dentes na testa para acasalamento - Portal Amazonas 9<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/portalam9.com.br\/?p=3532\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Tubar\u00f5es fantasmas desenvolvem dentes na testa para acasalamento - 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