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The adult barnacle bears no resemblance to an acorn barnacle, but the larval development is typical of a barnacle, with four nauplius larval stages and one cyprid larval stage. [2] The female cyprid larva of L. panopaei has a spear-like stylet.
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 Acrothoracica are an infraclass of barnacles. [2] Acrothoracicans bore into calcareous material such as mollusc shells, coral, crinoids or hardgrounds, producing a slit-like hole in the surface known by the trace fossil name Rogerella. Acrothoracicans are typically smaller than other types of barnacle, being only a few millimetres in length.
Pollicipes polymerus, commonly known as the gooseneck barnacle or leaf barnacle, is a species of stalked barnacle. It is found, often in great numbers, on rocky shores on the Pacific coasts of North America .
Nauplius of A. modestus. A. modestus is a suspension feeder. It has feathery appendages which beat rhythmically to draw plankton and other organic particles into the shell for consumption. [6] Eggs are laid and develop into nauplius larvae which are released into the phytoplankton.
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 ]
The genus name Nauplius was published posthumously by Otto Friedrich Müller in 1785 for animals now known to be the larvae of copepods. The nauplius stage (plural: nauplii) is characterised by consisting of only three head segments, which are covered by a single carapace. The posterior body, when present, is unsegmented.
Rhizocephala are derived barnacles that are parasitic castrators. Their hosts are mostly decapod crustaceans, but include Peracarida, mantis shrimps and thoracican barnacles. Their habitats range from the deep ocean to freshwater. [1] [2] Together with their sister groups Thoracica and Acrothoracica, they make up the subclass Cirripedia. [3]
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