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Cryptophialus minutus is a small (2 mm) cirripede that has no shell. It mechanically burrows into the shell of host organisms such as Concholepas peruviana. [2] Unlike many barnacle species, C. minutus is not hermaphroditic.
The barnacle creates a crown-shaped shell, and in most instances, deeply embeds itself into the skin for stability while riding a fast-moving host. The shell plates are made of calcium carbonate and chitin. Whale barnacles may live for up to a year, and often slough off along migration routes or at whale calving grounds.
With some species of whale louse, whale barnacle infestations play an important role. On the right whale, the parasites live mainly on callosities (raised callus-like patches of skin on the whales' heads). The clusters of white lice contrast with the dark skin of the whale, and help researchers identify individual whales because of the lice ...
Like other acorn barnacles, S. cariosus is a filter feeder; when it is under water, the moveable terga at the apex part, and the cirri are extended to feed. When above water, the terga shut tightly for protection and to prevent desiccation. Small barnacles are sometimes "bulldozed" off the rock by the limpet Lottia digitalis while it is grazing ...
Barnacle adults are sessile; most are suspension feeders with hard calcareous shells, but the Rhizocephala are specialized parasites of other crustaceans, with reduced bodies. Barnacles have existed since at least the mid-Carboniferous, some 325 million years ago. In folklore, barnacle geese were once held to emerge fully formed from goose ...
The anti-settling effect against the barnacle has been shown in vitro: [9] When the barnacle cyprid larva encounters a surface containing medetomidine the molecule interacts with the octopamine receptor in the larva. This causes the settling larva to increase its kicking to more than 100 kicks per minute, which makes becoming sessile nearly ...
Sacculina. Sacculina is a genus of barnacles that is a parasitic castrator of crabs.They belong to a group called Rhizocephala.The adults bear no resemblance to the barnacles that cover ships and piers; they are recognised as barnacles because their larval forms are like other members of the barnacle class Cirripedia.
Identification of barnacles in the field can be challenging, and identification of particular species of Chthamalus is not considered reliable in the field other than a few species. However, a notable distinction in the arrangement of wall plates can help biologists distinguish Chthamalid barnacles from the other common barnacles in the family ...
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