Sinciputal ear system

The sinciputal ear system, also called an arc-ear, is the large ear which reaches across the top of the head in eses. Though it only has single membrane, it features 2 to 4 inner ear mechanisms so that a reverberation caused by a sound wave coming from the exoanimal's left will be detected by the left-most mechanism first, continuing across the ear system. As not all of the inner ear systems are perfectly vertically aligned, the height of the source of sound can also be determined. As a result, the sinciputal ear system allows for fast location.

This ear system is also sensitive enough to be used for echolocation, the primary sense for many exoanimals on Pontret.

In some groups, the sinciputal ear system has been subdivided so that if one membrane was damaged or pierced, it would not badly affect the accuracy of the system as a whole.

Etymology
The name of the sinciputal ear system derives from the Latin 'sinciput' from 'semi-' meaning half and 'caput' meaning head. It is referred to as a system due to the multiple inner ear mechanisms.

The second term, arc-ear, comes from the shape of the organ, often an arc reaching from one side of the top of the exoanimal's head to the other, although some arc-ears are straighter and some are divided.