barnacles barnacles - a genus of barnacles cancers (suborder barnacles).Adults of this species are fixed life, attaching themselves to hard surfaces.Resettlement is possible only at the larval stage.Currently, to this genus includes 60 species.
These marine animals (photo below) have calcareous shells, which is attached to the substrate.Shell itself consists of 6 plates, four of which form the lid and have the ability to move apart.Rachok lies at the bottom of the house, sticking out his limbs between open plates.At the same time he makes vigorous rhythmic sweeps, to drive into the lodge food particles from the water.
in diameter barnacle reaches seven centimeters in length - 13. Colouring is usually whitish or grayish with longitudinal stripes of purple or brown.
barnacles its broad soles attached to any surface - mollusk shells, rocks, tree roots, piles of piers, the bottoms of ships, as well as to a variety of animals.Below you can see pictures of marine animals, which can attach an acorn.The adhesive, which is produced barnacles, very stable.It can withstand temperatures up to 200 degrees and is not affected by alkalis, acids and other solvents.
In turn, large wings barnacles often settle soft sponge, which house the crustacean is a reliable and solid foundation.
life cycle of barnacles
barnacles Development consists of the following phases: egg, larva, adult crayfish.Larvae hatched, float freely and are two stages: nauplius and Zypries.In cold-water species of larval stage lasts from 2 weeks prior to the 1st of the month, while tropical - about 3-5 days.
larvae stage in Zypries not eat.For a while they swim, but, once in favorable conditions are attached to the substrate.Adult crabs are fixed life.
barnacles grow and develop quite rapidly.In the tropics, some species are already 1-2 weeks after settling reach maturity.In colder Baltic Sea it takes about three months.The life expectancy of crustaceans from 1-2 to 5-7 years and more.
How multiplies sea acorn
between individuals sitting side by side, to cross-fertilization.Barnacles is a hermaphrodite, that is, each has both male and female gonads.Near the bottom of the front pair of legs open oviducts, of which overlook the eggs, and then falling into the cavity of the mantle.Vas efferens flow into the tubular male copulatory organ, which when paired straightened, protruding outward and into the mantle cavity of the front of the individual.Provide them with the sperm fertilizes the eggs.Studies have been conducted, during which it became clear that the sea acorn can reproduce alone.After fertilization, the egg group in the mantle cavity connected to oviparous plate and start crushing.
cold-egg in a special way during the summer, fertilize them in the winter to spring out the larvae.Heat-loving individuals throughout the year lay eggs several times.
