Aplousobranchia

Aplousobranchia is an order of sea squirts in the class Ascidiacea, first described by Fernando Lahille in 1886. They are colonial animals, and are distinguished from other sea squirts by the presence of relatively simple pharyngeal baskets. This provides the etymology of their name: in Ancient Greek, () means "simple". The posterior part of the abdomen contains the heart and gonads, and is typically larger than in other sea squirts.

Polycitoridae is a family of tunicates belonging to the order Aplousobranchia.

Pseudodistomidae is a family of tunicates belonging to the order Aplousobranchia.

Diazonidae is a family of sea squirts belonging to the order Aplousobranchia.

Ritterellidae is a family of tunicates belonging to the order Aplousobranchia.

Eudistoma is a genus of sea squirts belonging to the family Polycitoridae. It was first described in 1909 by Maurice Caullery. Originally it was thought to be a subgenus of Distoma. Eudistoma is the most species-rich genus in the family Polycitoridae, with 124 valid species as of 2014. They are found in tropical and temperate waters; some species are also found in the Antarctic and subtropical area.

Protopolyclinidae is a family of tunicates belonging to the order Aplousobranchia.

Euherdmannia is a genus of tunicates. It is the only genus in the family Euherdmaniidae in the order Aplousobranchia.

Cystodytes is a genus of tunicates belonging to the family Polycitoridae.

species of chordates

species of chordates

Polycitor is a genus of tunicates belonging to the family Polycitoridae.

Archidistoma is a genus of tunicates in the family Polycitoridae.

Diazona is a genus of tunicates in the family Diazonidae.

species of chordates

Rhopalaea is a genus of tunicates belonging to the family Diazonidae. The genus has a cosmopolitan distribution in warm and temperate oceans.

Eucoelium is a genus of tunicates belonging to the family Polycitoridae.

Placentelidae is a family of tunicates belonging to the order Aplousobranchia. It contains a single genus, Placentela.

species of chordates

species of chordates

species of chordates

Pharyngodictyon is a genus of tunicates belonging to the family Ritterellidae.