The spinous process is short, and nearly horizontal in direction.

Spinous cells are found in the superficial layers of the skin.

The abdominal end of females is generally provided with spinous processes.

They extend from the root to the apex of each spinous process.

A similar term is "vertebral line", which defined by the spinous processes.

Although these are not true spines, this type of fin is called a spinous ray.

The antennae are limited to a spinous process and a single seta.

It often has a dark spot on its spinous dorsal spines between the 6th and 11th.

The spinous process is short and bifid, the two divisions being often of unequal size.

They have no spinous rays meaning none of their rays are hard.

In some, the plate extends at the front into a spinous process, the zygomatic spine.

Between the spinous processes it is continuous with the interspinal ligaments.

The colour is uniform all over the body, with only the tip of the spinous dorsal fins black.

In spinous fins the distal is often fused to the middle, or not present at all.

The carina is modified into spinous processes on last three whorls.

The tremendous force pulls on the spinous process producing an avulsion fracture.

The abdomen of the females often ends with spinous processes, used in ovideposition.

The spinous processes of the cervical and lumbar regions can be felt through the skin.

The membranes of the first, spinous dorsal fin are black, giving the species its common name.

The spinous cells are arranged several layers thick to form a net-like covering.

Their origins are in the upper thoracic and lower cervical spinous processes.

The lamina connect the spinous process to the pedicles.

They are small narrow bundles, attached, above and below, to the apices of the spinous processes.

The Tuohy needle is usually inserted in the midline, between the spinous processes.

Other common names for this species are spinous shark and spiny shark.