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- W1968992947 abstract "Abstract. The asymmetry displayed by the body plan of gastropods has been directly or indirectly attributed to an evolutionary process called torsion. Torsion is defined as a rotation of 180° between the cephalopodium (head and foot) and visceropallium (visceral organs, mantle, mantle cavity, and shell). During development, the displacement of anatomical components occurs during a process called “ontogenetic torsion.” Although ontogenetic torsion is central to theories of gastropod evolution, surprisingly few studies have documented actual tissue movements during the development of asymmetry in gastropods. We investigated the development of the mantle cavity and pleurovisceral nerve connective (visceral nerve loop) in the caenogastropods Amphissa columbiana and Euspira lewisii, because displacements of both of these structures are interpreted as major consequences of torsion. Scanning electron micrographs, histological sections, and immunofluorescence images showed that the developing vis-ceropallium twists by 90° relative to the cephalopodium, the mantle cavity initially forms on the right side, and displacements of the visceral nerve loop become evident on the left side before the right side. A developmental stage in which the mantle cavity is confined to the right side has also been reported in members of the Vetigastropoda and Heterobranchia. We suggest that further comparative studies should test the hypothesis that early development throughout the Gastropoda converges on an embryonic organization in which the mantle cavity and anus are located laterally, despite clade-specific differences in developmental patterns both before and after this stage." @default.
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- W1968992947 date "2005-05-11" @default.
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- W1968992947 title "Development of asymmetry in the caenogastropods Amphissa columbiana and Euspira lewisii" @default.
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- W1968992947 doi "https://doi.org/10.1111/j.1744-7410.2003.tb00070.x" @default.
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