Sorberacea were a monoorder and monofamilial class of benthic Tunicates. The single order of the class was Aspiraculata, and the single family of that order was Hexacrobylidae. In a taxonomic revision of the Tunicata in 2007, the name "Hexacrobylidae" was declared invalid and members of the family were included in the family Molgulidae in the class Ascidiacea.
Didemnum is a genus of colonial tunicates in the family Didemnidae. It is the most speciose genus in the didemnid family. Species in this genus often have small calcareous spicules embedded in the tunic and form irregular or lobed colonies. Some Didemnum species, including Didemnum vexillum and Didemnum perlucidem are considered invasive species. In early 2006, Didemnum vexillum was found covering a 230 km2 area of cobble habitat in Georges Bank off the coast of New England, and is classified as an invasive species of greatest concern in coastal areas throughout Europe, New Zealand, and North America. Didemnum sp. invasions have also been recorded in Canada, the Mediterranean, and the Netherlands.
Molgula, or sea grapes, are very common, globular, individual marine tunicates roughly the size of grapes.
Eusynstyela is a genus of ascidian tunicates in the family Styelidae.
Stolidobranchia is an order of tunicates in the class Ascidiacea. The group includes both colonial and solitary animals. They are distinguished from other tunicates by the presence of folded pharyngeal baskets. This provides the etymology of their name: in ancient Greek, στολίς, ίδος means the "fold" of a cloth. Stolidobranchian sea squirts are also characterized by the complete absence of an abdomen. The abdominal organs of other tunicates are instead located to one side of the pharyngeal basket in this group.
Aplidium is a genus of colonial sea squirts, tunicates in the family Polyclinidae. There are about 188 species in the genus found in shallow waters around the world.
Polycarpa is a genus of ascidian tunicates in the family Styelidae.
Aplidiopsis is a genus of colonial sea squirts, tunicates in the family Polyclinidae.
Asajirus is a genus of marine tunicates. Asajirus indicus was found on the Antarctic Peninsula, west of Palmer Archipelago at a depth of 2763-2818m.
Molguloides is a genus of marine tunicates.
Oligotrema is a genus of marine tunicates.
Alloeocarpa is a genus of ascidian tunicates in the family Styelidae.
Bathystyeloides is a genus of ascidian tunicates in the family Styelidae.
Monandrocarpa is a genus of ascidian tunicates in the family Styelidae.
Tibitin is a genus of ascidian tunicates in the family Styelidae.
Protomolgula is a genus of ascidian tunicates in the family Molgulidae.
Bathypyura is a genus of ascidian tunicates in the family Pyuridae.
Bolteniopsis is a genus of ascidian tunicates in the family Pyuridae.
Heterostigma is a genus of ascidian tunicates in the family Pyuridae.
Distaplia is a genus of tunicates belonging to the family Holozoidae.
