Høeg & Rybakov, 1992
Thompsomiidae ( lapsus )
The Thompsoniidae are a family of parasitic barnacles belonging to the bizarre and highly apomorphic superorder Rhizocephala, and therein to the more diverse of the two orders, the Akentrogonida.
Family is one of the eight major hierarchical taxonomic ranks in Linnaean taxonomy; it is classified between order and genus. A family may be divided into subfamilies, which are intermediate ranks between the ranks of family and genus. The official family names are Latin in origin; however, popular names are often used: for example, walnut trees and hickory trees belong to the family Juglandaceae, but that family is commonly referred to as being the "walnut family".
In evolutionary biology, parasitism is a relationship between species, where one organism, the parasite, lives on or in another organism, the host, causing it some harm, and is adapted structurally to this way of life. The entomologist E. O. Wilson has characterised parasites as "predators that eat prey in units of less than one". Parasites include protozoans such as the agents of malaria, sleeping sickness, and amoebic dysentery; animals such as hookworms, lice, mosquitoes, and vampire bats; fungi such as honey fungus and the agents of ringworm; and plants such as mistletoe, dodder, and the broomrapes. There are six major parasitic strategies of exploitation of animal hosts, namely parasitic castration, directly transmitted parasitism, trophically transmitted parasitism, vector-transmitted parasitism, parasitoidism, and micropredation.
A barnacle is a type of arthropod constituting the infraclass Cirripedia in the subphylum Crustacea, and is hence related to crabs and lobsters. Barnacles are exclusively marine, and tend to live in shallow and tidal waters, typically in erosive settings. They are sessile (nonmobile) suspension feeders, and have four nektonic larval stages. Around 70 barnacle species are currently known. The name "Cirripedia" is Greek, meaning "curl-footed". The study of barnacles is called cirripedology.
The Thompsoniidae are one of the smallish families of Rhizocephala, as typical for the Akentrogonida. They only contain four genera, of which two are not universally accepted:
Thompsonia is a genus of barnacles which has evolved into an endoparasite of other crustaceans, including crabs and snapping shrimp. It spreads through the host's body as a network of threads, and produces many egg capsules which emerge through joints in the host's shell.
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. The prevalence of this crustacean parasite in its crab host can be as high as 50%.
Peter Høeg is a Danish writer of fiction. He is best known for his novel, Miss Smilla's Feeling for Snow (1992).
Rhizocephala are derived barnacles that parasitise decapod crustaceans. 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 Greek roots ῥίζα and κεφαλή, describing the adult female, which mostly consists of a network of thread-like extensions penetrating the body of the host.
Thecostraca is a subclass of marine invertebrates containing about 1,320 described species. Many species have planktonic larvae which become sessile or parasitic as adults.
Eulimidae is a family of very small parasitic sea snails, marine gastropod mollusks in the superfamily Vanikoroidea.
Lottiidae is a family of sea snails, specifically true limpets, marine gastropod mollusks in the superfamily Lottioidea and the clade Patellogastropoda.
The Lernaeodiscidae are a family of parasitic barnacles belonging to the bizarre and highly apomorphic superorder Rhizocephala, and therein to the less diverse of the two orders, the Kentrogonida. The Lernaeodiscidae are one of the smallish families of Rhizocephala, though the only one among the Kentrogonida. The family contains three genera: Lernaeodiscus Müller, 1862, Septodiscus Van Baal, 1937 and Triangulus Smith, 1906.
The Sacculinidae are a family of barnacles belonging to the bizarre parasitic and highly apomorphic superorder Rhizocephala, and therein to the less diverse of the two orders, the Kentrogonida. The Sacculinidae are one of the two larger families of Rhizocephala, containing seven genera:
The Peltogastridae are a family of barnacles belonging to the bizarre parasitic and highly apomorphic superorder Rhizocephala, and therein to the less diverse of the two orders, the Kentrogonida. The Peltogastridae are by far the largest family of Rhizocephala. They comprise 14 genera:
Lepetodrilus is a genus of small, deep-sea sea snails, hydrothermal vent limpets, marine gastropod mollusks in the family Lepetodrilidae.
Megadenus is a genus of sea snails, marine gastropod mollusks in the family Eulimidae.
Monogamus is a genus of small sea snails, marine gastropod mollusks in the family Eulimidae.
The clade Multicrustacea constitutes the largest superclass of crustaceans, containing approximately four-fifths of all described crustacean species, including crabs, lobsters, shrimps, woodlice, prawns, krill, barnacles, crayfish, copepods, amphipods and others. The largest branch of multicrustacea is the class Malacostraca.
The Hexanauplia constitute a class of crustaceans, comprising three groups: the Copepoda, the Tantulocarida and the Thecostraca.
Heterosaccus is a genus of barnacles in superorder Rhizocephala. Like other taxa in this superorder, they parasitize crabs. Geoffroy Smith circumscribed the genus in 1906; he initially only included H. hians. Smith circumscribed a genus distinct from Sacculina due to a difference of the mesentery; in Heterosaccus, the mesentery does not stretch down to the mantle opening but rather only is present on the ring of attachment.
Polyascus is a genus of barnacles in superorder Rhizocephala. It was circumscribed in 2003 by Henrik Glenner, Jørgen Lützen, and Tohru Takahashi. They included three species, all transferred from Sacculina. The generic name polyascus refers to the typical presence of multiple external sac-like female bodies, known as externae. In Polyascus species, these originate from asexual reproduction.
Sylon hippolytes is a castrating parasite that infects the shrimp Pandalina brevirostris.
Clistosaccidae is a family of parasitic barnacles belonging to the bizarre and highly apomorphic superorder Rhizocephala, which is part of the more diverse of the two orders, the Akentrogonida.
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