Sessility (motility)

This is distinct from the botanical concept of sessility, which refers to an organism or biological structure attached directly by its base without a stalk.

Later they move to the edge of the cactus pad where the wind catches the wax filaments and carries the tiny larval cochineals to a new host.

Many sessile animals, including sponges, corals and hydra, are capable of asexual reproduction in situ by the process of budding.

This is why the most widely accepted theory explaining the evolution of a larval stage is the need for long-distance dispersal ability.

[2] Clumping is a behavior in sessile organisms in which individuals of a particular species group closely to one another for beneficial purposes, as can be seen in coral reefs and cochineal populations.