Torrentz will always love you. Barnacles are exclusively marine, unlock her legs pdf free tend to live in shallow and tidal waters, typically in erosive settings.
Barnacles are encrusters, attaching themselves permanently to a hard substrate. In some barnacles, the cement glands are fixed to a long, muscular stalk, but in most they are part of a flat membrane or calcified plate. The plates are held together by various means, depending on species, in some cases being solidly fused. Inside the carapace, the animal lies on its back, with its limbs projecting upwards. Adult barnacles have few appendages on their heads, with only a single, vestigial pair of antennae, attached to the cement gland. The six pairs of thoracic limbs are referred to as “cirri”, which are feathery and very long, being used to filter food, such as plankton, from the water and move it towards the mouth.
The blood vascular system is minimal. The excretory organs of barnacles are maxillary glands. The main sense of barnacles appears to be touch, with the hairs on the limbs being especially sensitive. The adult also has a single eye, although this is probably only capable of sensing the difference between light and dark.