forward margin

The forward margin of the mantle on the ventral side is concave.

Slowly its forward margin crept across ocean and land, engulfing the dots representing Sanctuaries.

Centipedes have a rounded or flattened head, bearing a pair of antennae at the forward margin.

The forward margin concave and undulated, and about one-third longer than the rear margin.

Most 'normal' trilobites have a more or less horizontal rim around the forward margin, which may have rested on the sediment surface.

The pectoral fin disc is diamond-shaped, slightly wider than long, with gently convex forward margins and a blunt snout.

The forward margin of the hind wing bears a number of hooked bristles, or "hamuli", which lock onto the fore wing, keeping them held together.

The sternum had the deep and short shape typical for dynamic soarers, and bony outgrowths at the keel's forward margin securely anchored the furcula.

The forward margin of the head is arched, with weak medial and lateral indentations and no prenarial grooves, traits that this species shares with the scalloped bonnethead (Sphyrna corona).

The altered musculature is also responsible for the alteration in the shape of the rest of the scapula; the forward margin of the original bone became the spine and acromion, from which the main shelf of the shoulder blade arises as a new structure.