Results 121 to 130 of about 205,581 (146)

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   +5 more sources

GARSTANG'S HYPOTHESIS AND GASTROPOD TORSION

Journal of Molluscan Studies, 1987
C. B. Goodhart
semanticscholar   +4 more sources

Gastropod torsion: predation and the opercular imperative

Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen, 1982
Steven Stanley
semanticscholar   +4 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
openaire   +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   +4 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   +3 more sources

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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

Adnexal Torsion: Review of Radiologic Appearances.

Radiographics, 2021
Adnexal torsion is the twisting of the ovary, and often of the fallopian tube, on its ligamental supports, resulting in vascular compromise and ovarian infarction.
M. Dawood, M. Naik, N. Bharwani, S. Sudderuddin, A. Rockall, V. Stewart   +5 more
semanticscholar   +1 more source

On a Ciliary Process of Food‐collecting in the Gastropod Turritella communis Risso

, 2009
SUMMARY. The mantle-cavity of Turritella communis has an inhalent aperture on the left side and an exhalent one on the right. The former is guarded by a complex array of tentacles preventing the ingress of large particles.
A. Graham
semanticscholar   +1 more source