The short apical segment of the rostrum identifies the family.

The apical segment is flexible.

Its most distinctive feature from other Silphidae is its clubbed antennae with three orange apical segments and a black base.

The apical segment of the antennae of Muscidae are plumose, and the basal portion is smooth.

The apical segment of the maxillary palpus carries no setae, and the labium has no strut.

In insects, it contains most of the digestive tract, respiratory system, and circulatory system, and the apical segments are typically modified to form genitalia.

In most of the families, the third segment is enlarged and the more apical segments are reduced to an appendage-called a stylus when rigid and an arista when bristle-like.

Chest Xray and other imaging studies Abscess is often unilateral and single involving posterior segments of the upper lobes and the apical segments of the lower lobes as these areas are gravity dependent when lying down.