Evolution of Love Darts
Because of the presence of darts in many superfamilies of the Stylommatophora, it seems likely that love darts appeared during the early evolution of the Pulmonata, and that the ancestors of the Stylommatophora possessed darts already.
During evolution, darts appear to have been lost secondarily, i.e., after they had evolved and been functional. Vestigial darts (ones that exist only in a rudimentary condition) occur in the family Sagdidae., and in many Helicoidea, the surrounding organs have also degenerated (become non-functional). The sarcobelum is a fleshy or cuticle-coated papilla which is considered to be a degenerated, previously dart-bearing, organ.
Read more about this topic: Love Dart
Famous quotes containing the words evolution of, evolution, love and/or darts:
“The evolution of a highly destined society must be moral; it must run in the grooves of the celestial wheels.”
—Ralph Waldo Emerson (1803–1882)
“The more specific idea of evolution now reached is—a change from an indefinite, incoherent homogeneity to a definite, coherent heterogeneity, accompanying the dissipation of motion and integration of matter.”
—Herbert Spencer (1820–1903)
““What can be shown?
What true love be?
All could be known or shown
If Time were but gone.””
—William Butler Yeats (1865–1939)
“Rejoice with the anchovy who darts in and out of salads.”
—Anne Sexton (1928–1974)