Results 71 to 80 of about 138 (89)
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THE ADAPTIVE SIGNIFICANCE OF GASTROPOD TORSION
Evolution; International Journal of Organic Evolution, 1966Unique among mollusks, the Gastropoda are characterized by a curious asymmetry, resulting from a rotation of the visceral hump and shell. Thus in the earlier stages of their embryonic development, gastropods have the same arrangement of parts as other mollusks, with the rudiments of the mantle cavity, gills, coelomic ducts, and associated structures at
Michael T Ghiselin
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Gastropod ontogenetic torsion: Developmental remnants of an ancient evolutionary change in body plan
The Journal of Experimental Zoology, 2003AbstractA dramatic morphogenetic movement (‘ontogenetic torsion’) during the development of gastropods has been proposed as a recapitulation of the original developmental departure that established the novel gastropod body plan. Nevertheless, speculative literature about ontogenetic torsion and its evolutionary significance has far outstripped ...
Louise Page
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Larval Muscle Contraction Fails to Produce Torsion in a Trochoidean Gastropod
Biological Bulletin, 2001The causes and effects of ontogenetic torsion in gastropods have been debated intensely for more than a century (1-19). Occurring rapidly and very early in development, torsion figures prominently in shaping both the larval and adult body plans. We show that mechanical explanations of the ontogenetic event that invoke contraction of larval retractor ...
Michael Hadfield
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Gastropod torsion: predation and the opercular imperative
Neues Jahrbuch Fur Geologie Und Palaontologie - Abhandlungen, 1982exaly +2 more sources
GARSTANG'S HYPOTHESIS AND GASTROPOD TORSION
Journal of Molluscan Studies, 1987exaly +2 more sources
Growth and morphogenesis of the gastropod shell [PDF]
Proceedings of the National Academy of Sciences of the United States of America, 2019 J David Lambert, Nina Fogel
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A congruent topology for deep gastropod relationships [PDF]
Proceedings of the Royal Society B: Biological Sciences, 2019 Gonzalo Giribet, Tauana Cunha
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Evolution & Development, 2002
SUMMARY Results of this study on two species of vetigastropods contradict the long‐standing hypothesis, originally proposed by Garstang (1929), that the larval retractor muscles power the morphogenetic movement of ontogenetic torsion in all basal gastropods.
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SUMMARY Results of this study on two species of vetigastropods contradict the long‐standing hypothesis, originally proposed by Garstang (1929), that the larval retractor muscles power the morphogenetic movement of ontogenetic torsion in all basal gastropods.
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Muscle morphogenesis in primitive gastropods and its relation to torsion
Proceedings of the Zoological Society of London, 1955SSummaryInHaliotis tuberculata, Patella vulgata and Patina pellucidathe young are hatched at an early trochophore stage and remain only a few days in the plankton, but inCalliostoma zizyphinumthe whole of this phase takes place within the egg membranes and the larva is plantigrade from the time of hatching.In all four genera the larval retractor muscle
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Marine Biology, 1972
Cultures of developing larvae of Gibbula cineraria (L.) were obtained from adults spawning in the laboratory, and these cultures were reared to settlement of the larvae at 9 days. Dispersal of the outer jelly coat of the egg appeared to be delayed in the presence of spermatozoa.
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Cultures of developing larvae of Gibbula cineraria (L.) were obtained from adults spawning in the laboratory, and these cultures were reared to settlement of the larvae at 9 days. Dispersal of the outer jelly coat of the egg appeared to be delayed in the presence of spermatozoa.
openaire +1 more source