Results 1 to 10 of about 88,911 (120)

At the limits of a successful body plan - 3D microanatomy, histology and evolution of Helminthope (Mollusca: Heterobranchia: Rhodopemorpha), the most worm-like gastropod. [PDF]

Front Zool, 2013
Brenzinger B, Haszprunar G, Schrödl M.
europepmc   +1 more source

Aquatic sloths (<i>Thalassocnus</i>) from the Miocene of Chile and the evolution of marine mammal herbivory in the Pacific Ocean. [PDF]

PeerJ
Valenzuela-Toro AM, Pyenson ND, Velez-Juarbe J, Suárez ME.   +3 more
europepmc   +1 more source

Capitella teleta gets left out: possible evolutionary shift causes loss of left tissues rather than increased neural tissue from dominant-negative BMPR1. [PDF]

Neural Dev
Webster NB, Meyer NP.
europepmc   +1 more source

THE ADAPTIVE SIGNIFICANCE OF GASTROPOD TORSION

Evolution; International Journal of Organic Evolution, 1966
Unique 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 Ghiselin
exaly   +5 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
exaly   +3 more sources

Gastropod torsion: predation and the opercular imperative

Neues Jahrbuch Fur Geologie Und Palaontologie - Abhandlungen, 1982
exaly   +2 more sources

GARSTANG'S HYPOTHESIS AND GASTROPOD TORSION

Journal of Molluscan Studies, 1987
exaly   +2 more sources

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
openaire   +2 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.
openaire   +2 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.
openaire   +1 more source