The swim bladder is the most accurate diagnostic feature, having two posterior extensions and two anterior extensions.

What was believed to be dorsal was simply the posterior extension of the more anterior territory.

Japanese whiting have a swim bladder characterised by a single, long posterior extension which tapers to a slender point.

Retinal detachment can be rarely caused by posterior extension of the tumor.

There is a single posterior extension.

There is a single tapering posterior extension and a duct like process which runs from the ventral surface to the urogenital opening.

Some polychaete prostomia have a posterior extension or ridge with sensory function, called a caruncle.

The posterior extension is a single, tapering projection that extends well into the caudal region.

The swim bladder of S. arabica has no anterior extensions and a single posterior extension.

There are also two posterior extensions which project into the post-coelomic region.