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- W2021306714 abstract "In separate phragmocone chambers of Paleozoic and Mesozoic ammonoids, different imprints have been discovered, such as crumples, folds, scars and lines. Calcite linear longitudinal and concentric structures are most important among them. The formers are observed only on cores of phylloceratids and lytoceratids and are called “lines of longitudinal contacts”, whereas the latters, observed almost in all the studied ammonites, are called “pseudosutures”. They all are secreted by mural parts of the body rear end while displacement in the shell. The mantle displacement was carried out by pressure of chamber liquid on the rear part of ammonite body: most likely, started from the near-ventral part, whereas near-sutural element of the soft body shifted at the end. The displacement process was long, complex and arhythmical. Three stages are distinguished in it — initial, intermediate (main) and final. Displacement proceeded slowly on the first and final stages, while on intermediate stage its rate was comparatively fast. Différentes traces en forme de rides, plis, traits, lignes ont été découvertes dans certaines loges du phragmocône des ammonoïdes mésozoïque et paléozoïques. Les plus importantes sont les structures calcaires longitudinales et concentriques. Les premières sont marquées seulement sur les moules internes des Phyllocératidés et Lytocératidés, que nous appelons “les lignes de contacts longitudinaux” et les secondes, observées presque chez toutes les ammonites étudiées — dites “pseudosutures”. Tous ces éléments sont sécrétés par les parties arrières du corps pendant son déplacement dans la coquille. Le déplacement du manteau se réaliserait grâce à la pression hydrostatique du liquide caméral sur l'extrémité du corps de l'ammonite. Le déplacement commeçerait par la partie préventrale et se terminerait par les éléments préombilicaux du corps. Le processus du déplacement était long, compliqué et arythmique. On distingue 3 étapes: initiale, intermédiaire (principale) et terminale. La vitesse de déplacement était faible pour les étapes initiale et terminale, relativement forte pour l'étape intermédiaire." @default.
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- W2021306714 date "1993-01-01" @default.
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- W2021306714 title "On mechanism of soft body movement within body chamber in Ammonites" @default.
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- W2021306714 doi "https://doi.org/10.1016/s0016-6995(06)80381-5" @default.
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