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In some families of pulmonate land snails, one unusual feature of the reproductive system and reproductive behavior is the creation and utilization of love darts, the throwing of which has been identified as a form of sexual selection. [1] Gastropods reproductive systems vary significantly from one taxonomic group to another.
The freshwater snail Physa acuta is a self-fertile organism that can be exposed either to strong sexual selection or to self-fertilization depending on its mode of reproduction. Noel et al. [ 29 ] used Physa acuta to experimentally determine whether accumulation of deleterious mutations is avoided by inbreeding populations of the snail, as well ...
Reproduction is predominantly, and probably exclusively, by outcrossing. [30] [31] During a mating session of several hours, two snails exchange sperm reciprocally. H. aspersa snails stab a calcite spine, known as a love dart, into their partner. The mucus coating the love dart contains a chemical that diverts sperm away from being digested.
Interestingly, slugs have both male and female reproductive organs, so they all can lay eggs. ... These techniques also are helpful in managing snails in your garden. How To Identify Slug Damage ...
SEM image of lateral view of a love dart of the land snail Monachoides vicinus.The scale bar is 500 μm (0.5 mm). Drawing showing a side view of the love dart of the snail Helix pomatia. 1 = flared base of the dart. 2 = position of the inner cavity. 3 = longitudinal flanges or vanes. 4 = sharp tip or blade of the dart A love dart from Cornu aspersum (garden snail) on a ruler for comparison ...
For garden snails, researchers estimate the occurrence frequency of snail kings at 1:40,000 individuals. [4] However, in some other species of snail, the counterclockwise shell-coiling is quite common, and in a few cases the more uncommon shell coiling is the right-hand (clockwise) direction.
Again, in some land snails, an unusual feature of the reproductive system of gastropods is the presence and utilization of love darts. [ citation needed ] In many marine gastropods other than the opisthobranchs , there are separate sexes ( dioecious / gonochoric ); most land gastropods, however, are hermaphrodites .
The white-lipped snail or garden banded snail, scientific name Cepaea hortensis, is a large species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Helicidae. The only other species in the genus is Cepaea nemoralis .