Verruca (crustacean)
''Verruca'' is a genus of asymmetrical sessile barnacles in the family Verrucidae. There are about 20 described species in ''Verruca'', around half of them extinct. Species These species belong to the genus ''Verruca'': * '' Verruca cookei'' Pilsbry, 1928 * '' Verruca gibbosa'' Hoek, 1883 * '' Verruca jago'' Buckeridge, 1997 * '' Verruca laevigata'' (Sowerby, 1827) * '' Verruca minuta'' Young, 2000 * '' Verruca mitra'' Hoek, 1907 * '' Verruca scrippsae'' Zullo, 1964 * '' Verruca sewelli'' Stubbings, 1936 * '' Verruca spengleri'' Darwin, 1854 * ''Verruca stroemia ''Verruca stroemia'', the wart barnacle, is a species of asymmetrical sessile barnacle in the family Verrucidae Verrucidae is a family of asymmetrical sessile barnacles in the order Verrucomorpha. There are about 14 genera and more than 90 des ...'' (O.F. Müller, 1776) (wart barnacle) * '' Verruca vertica'' * † '' Verruca alaskana'' Pilsbry, 1943 * † '' Verruca gailgoedertae'' Perreault & Buckeridge, 2019 * † ...
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Sessility (motility)
Sessility is the biological property of an organism describing its lack of a means of self-locomotion. Sessile organisms for which natural ''motility'' is absent are normally immobile. 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. Sessile organisms can move via external forces (such as water currents), but are usually permanently attached to something. Organisms such as corals lay down their own substrate from which they grow. Other sessile organisms grow from a solid such as a rock, dead tree trunk, or a man-made object such as a buoy or ship's hull. Mobility Sessile animals typically have a motile phase in their development. Sponges have a motile larval stage and become sessile at maturity. Conversely, many jellyfish develop as sessile polyps early in their life cycle. In the case of the cochineal, it is in the nymph stage (also called the crawler stage) that the ...
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