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Euthyneury is a plesiomorphic condition present in some gastropods which is a result of two evolutionary events. The first event, which was experienced by the ancestors of all extant gastropods, is known as torsion. Torsion describes the event in which the intestines, heart, nephridia, gills, and nerve cords "twisted" causing some organs to migrate from the animal's left to its right in order to accommodate the relocation of the mantle cavity close to the animal's head. Torsion created a condition in the cerebrovisceral commissures called streptoneury. Secondarily, some gastropod lineages detorted: they reversed the torsion event and straightened out their internal organs, uncrossing the commissures in the process. It is this second state, one in which the commissures have once again becom

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  • Euthyneury (en)
  • Eutineuria (it)
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  • Euthyneury is a plesiomorphic condition present in some gastropods which is a result of two evolutionary events. The first event, which was experienced by the ancestors of all extant gastropods, is known as torsion. Torsion describes the event in which the intestines, heart, nephridia, gills, and nerve cords "twisted" causing some organs to migrate from the animal's left to its right in order to accommodate the relocation of the mantle cavity close to the animal's head. Torsion created a condition in the cerebrovisceral commissures called streptoneury. Secondarily, some gastropod lineages detorted: they reversed the torsion event and straightened out their internal organs, uncrossing the commissures in the process. It is this second state, one in which the commissures have once again becom (en)
  • L'eutineuria è una condizione plesiomorfica presente in alcuni gasteropodi che è il risultato di due eventi evolutivi. Il primo evento, che è stato sperimentato dagli antenati di tutti i gasteropodi esistenti, è noto come torsione. La torsione descrive l'evento in cui gli intestini, il cuore, il nefridio, le branchie e i cordoni nervosi "si attorcigliano" causando la migrazione di alcuni organi dalla sinistra dell'animale alla sua destra, al fine di favorire il trasferimento della cavità del mantello vicino alla testa dell'animale. La torsione ha creato una condizione nelle commessure cerebroviscerali chiamata chiastoneuria o streptoneuria. Secondariamente, alcuni lignaggi di gasteropodi subirono la detorsione: invertirono l'evento di torsione e raddrizzarono i loro organi interni, non inc (it)
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  • Euthyneury is a plesiomorphic condition present in some gastropods which is a result of two evolutionary events. The first event, which was experienced by the ancestors of all extant gastropods, is known as torsion. Torsion describes the event in which the intestines, heart, nephridia, gills, and nerve cords "twisted" causing some organs to migrate from the animal's left to its right in order to accommodate the relocation of the mantle cavity close to the animal's head. Torsion created a condition in the cerebrovisceral commissures called streptoneury. Secondarily, some gastropod lineages detorted: they reversed the torsion event and straightened out their internal organs, uncrossing the commissures in the process. It is this second state, one in which the commissures have once again become untwisted, that is called euthyneury. The Opisthobranchia represent one of the more prominent gastropod lineages that have undergone euthyneury. (en)
  • L'eutineuria è una condizione plesiomorfica presente in alcuni gasteropodi che è il risultato di due eventi evolutivi. Il primo evento, che è stato sperimentato dagli antenati di tutti i gasteropodi esistenti, è noto come torsione. La torsione descrive l'evento in cui gli intestini, il cuore, il nefridio, le branchie e i cordoni nervosi "si attorcigliano" causando la migrazione di alcuni organi dalla sinistra dell'animale alla sua destra, al fine di favorire il trasferimento della cavità del mantello vicino alla testa dell'animale. La torsione ha creato una condizione nelle commessure cerebroviscerali chiamata chiastoneuria o streptoneuria. Secondariamente, alcuni lignaggi di gasteropodi subirono la detorsione: invertirono l'evento di torsione e raddrizzarono i loro organi interni, non incrociando le commissure nel processo. È questo secondo stato, quello in cui le commessure sono tornate a non essere ritorte, che si chiama eutineuria. I gasteropodi che hanno subito eutineuria appartengono all'infraclasse Euthyneura. (it)
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