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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 ...
Their body plan is uniquely reduced in an extreme adaptation to their parasitic lifestyle, and makes their relationship to other barnacles unrecognisable in the adult form. The name Rhizocephala derives from the Ancient Greek roots ῥίζα ( rhiza , "root") and κεφαλή ( kephalē , "head"), describing the adult female, which mostly ...
When fully mature, the adult female form of H. balani is reduced to a bloated, star-shaped egg sac, [2] up to 8 mm in length inhabiting the mantle cavity of its barnacle host. [4] The barnacle host species are simultaneous hermaphrodites, with both male and female gonads in each adult.
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.
Female crabs care for their eggs by carrying them beneath their abdomen, keeping them well aerated and protecting them. L. panopaei manipulates the behaviour of both sexes of the crab on which it settles, so that the host treats the barnacle's brood sac as if it contained the crab's own eggs. In the case of male crabs, the parasite causes the ...
Sacculina carcini, the crab hacker barnacle, [2] is a species of parasitic barnacle in the family Sacculinidae, in particular a parasitic castrator, of crabs. The crab that most often is used as a host is the green crab , the natural range of which is the coasts of Europe and North Africa. [ 2 ]
Acorn barnacle and acorn shell are vernacular names for certain types of stalkless barnacles, generally excluding stalked or gooseneck barnacles. As adults they are typically cone-shaped, symmetrical, and attached to rocks or other fixed objects in the ocean. Members of the barnacle order Balanomorpha are often called acorn barnacles. [1] [2]
Semibalanus balanoides (common barnacle, common rock barnacle, or northern rock barnacle) is a common and widespread boreo-arctic species of acorn barnacle. It is common on rocks and other substrates in the intertidal zone of north-western Europe and both coasts of North America .