Web19 Mar 1999 · Torsion, or twisting, often lead to an assymetry in the mantle cavity organs, the loss of one of a set of paired gills being one of the most obvious examples. In … Torsion is a gastropod synapomorphy which occurs in all gastropods during larval development. Torsion is the rotation of the visceral mass, mantle, and shell 180˚ with respect to the head and foot of the gastropod. This rotation brings the mantle cavity and the anus to an anterior position above the head. In some … See more There are two different developmental stages which cause torsion. The first stage is caused by the development of the asymmetrical velar/foot muscle which has one end attached to the left side of the shell and the other … See more The original advantage of torsion for gastropods is unclear. It is further complicated by potential problems that accompany torsion. For example, having the place where … See more • Brusca, R.C.; Brusca, G.J. (1990) Invertebrates. Sinauer Associates, Inc. Massachusetts. • Page L. R. (2006) "Modern insights on … See more
Snails and Slugs (Gastropoda) - Molluscs
WebLarval torsion, a trait peculiar to gastropods that results in a 180-degree twisting of the body, produces a figure-eight arrangement of the viscera and nerve cord that persists throughout life. Most species have a proteinaceous or calcareous lid (operculum) on the foot that seals the aperture of the shell when the animal retracts. pirate bay for android
Snails and Slugs (Gastropoda) - Molluscs
Web7 Feb 2024 · Testicular torsion occurs when a testis torts on the spermatic cord resulting in the cutting off of blood supply. The most common symptom is acute testicular pain and the most common underlying cause, … WebTorsion in gastropods has the unfortunate result that wastes are expelled from the gut and nephridia near the gills. A variety of morphological and physiological adaptations have … WebThere is a unique process in the gastropod mollusks during larval development, known as torsion. The body moves from the back area to the front region, which causes a rotation so that the mantle cavity, which … piratebay forum