Thompsonia (barnacle)

Thompsonia
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Subphylum:	Crustacea
Class:	Maxillopoda
Infraclass:	Cirripedia
Superorder:	Rhizocephala
Order:	Akentrogonida
Family:	Thompsoniidae
Genus:	Thompsonia Kossmann, 1872
Type species
Thompsonia globosa Kossmann, 1872

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.

The first scientific description of the genus was Robby Kossmann's description in 1872 of Thompsonia globosa. Kossmann named the genus after William Thompson, the Irish naturalist who had recognised the cirripedian affinities of the Rhizocephala. The type specimens had been collected by Georg Semper in the East Indies, on the legs of the crab Lybia tessellata. Eleven species are now recognised:

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