Results 91 to 100 of about 209,671 (128)

Larval Muscle Contraction Fails to Produce Torsion in a Trochoidean Gastropod

The Biological Bulletin, 2001
The 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 ...
C S, Hickman, M G, Hadfield
semanticscholar   +4 more sources

Gastropod ontogenetic torsion: Developmental remnants of an ancient evolutionary change in body plan

Journal of Experimental Zoology Part B: Molecular and Developmental Evolution, 2003
AbstractA 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 R. Page
semanticscholar   +4 more sources

GARSTANG'S HYPOTHESIS AND GASTROPOD TORSION

Journal of Molluscan Studies, 1987
C. B. Goodhart
semanticscholar   +3 more sources

Gastropod torsion: predation and the opercular imperative

Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen, 1982
Steven Stanley
semanticscholar   +3 more sources

Ontogenetic torsion in two basal gastropods occurs without shell attachments for larval retractor muscles

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.
Louise R. Page
openaire   +3 more sources

Spawning, larval development and settlement behaviour of Gibbula cineraria (Gastropoda: Prosobranchia) with a reappraisal of torsion in gastropods

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.
A.J. Underwood
openaire   +2 more sources

Muscle morphogenesis in primitive gastropods and its relation to torsion

Proceedings of the Zoological Society of London, 1955
SSummaryInHaliotis 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
Doris R. Crofts
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Development of Lacuna pallidula (da Costa, 1778) from the White Sea (Caenogastropoda: Littorinimorpha) with emphasis on radula formation

Journal of molluscan studies, 2023
The gastropod radula is highly diverse in structure in comparison with that of other mollusсs. The main radular types in the different phylogenetic groups of gastropods differ not only in the general morphology and configuration of the teeth but also ...
E. Vortsepneva, D. Herbert, Y. Kantor
semanticscholar   +1 more source

TGF-&bgr; signalling is involved in torsion and shell positioning in the giant ramshorn snail Marisa cornuarietis (Gastropoda: Ampullariidae)

Journal of molluscan studies, 2018
Shell internalization has evolved convergently multiple times in numerous molluscan clades, including various gastropod families. Previous experiments on the early ontogeny of the caenogastropod Marisa cornuarietis and of a pulmonate species revealed ...
A. Link, R. Triebskorn, H. Köhler
semanticscholar   +1 more source

Improved Torsion-Point Attacks on SIDH Variants

Annual International Cryptology Conference, 2020
SIDH is a post-quantum key exchange algorithm based on the presumed difficulty of finding isogenies between supersingular elliptic curves. However, SIDH and related cryptosystems also reveal additional information: the restriction of a secret isogeny to ...
Victoria de Quehen, Péter Kutas, Christopher Leonardi, C. Martindale, Lorenz Panny, C. Petit, Katherine E. Stange   +6 more
semanticscholar   +1 more source