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- W2035576238 abstract "Stylophora (cornutes and mitrates) are controversial Paleozoic fossils, variously interpreted as ‘bizarre’echinoderms or as ‘calcichordates’ (primitive chordates). The calcichordate theory is based on the identification of left/right asymmetries supposed to be homologous in stylophorans and modern chordates. This theory imposes the homology of the plano-concave surface of the cornute test with the convex surface of the mitrate test. A detailed analysis of numerous internal and external structures exhibited by the appendage and the test demonstrates the homology of the plano-concave surface of the test in all stylophorans. The basic assumption of the calcichordate theory is thus not valid. Comparison of left/right asymmetries in these organisms with those of modem chordates is not grounded. Stylophora do not represent `calcichordates' but actual echinoderms. Les stylophores (cornutes et mitrates) constituent un groupe de fossiles paléozoïques dont la positionsystématique est controversée: échinodermes ‘bizarres’ ou ‘calcichordés’ (chordés primitifs). La théorie des calcichordés repose sur l'identification d'asymétries gauche/droite supposées homologues chez les stylophores et les chordés actuels. Ce modèle impose I'homologie de la face plano-concave du test des cornutes avec la face convexe du test des mitrates. Une analyse détaillée des nombreuses structures tant internes qu'externes présentes sur l'appendice articulé et le test de ces organismes démontre l'homologie de la face plano-concave du test chez tons les stylophores. L'hypothèse de base du modèle ‘calcichordé’ n'est par conséquent pas valide et la comparaison des asymétries droite/gauche de ces organismes avec celles des chordés actuels n'est pas justifiée. Les stylophores ne représentent donc pas des ‘calcichordes’ mais des échinodermes véritables." @default.
- W2035576238 created "2016-06-24" @default.
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- W2035576238 date "2000-01-01" @default.
- W2035576238 modified "2023-09-25" @default.
- W2035576238 title "Homologies in stylophora:A test of the ‘calcichordate theory’" @default.
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- W2035576238 doi "https://doi.org/10.1016/s0016-6995(00)80163-1" @default.
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