Krikobranchiae Aplousobranchia is an order of sea squirts in the class Ascidiacea, first described by Fernando Lahille in 1886.

[1][2] 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, ἁ.πλοος-ους (ha.ploos-ous) means "simple".

The posterior part of the abdomen contains the heart and gonads, and is typically larger than in other sea squirts.

Order Aplousobranchia[3]