Slow moving sea spiders are common, sometimes growing as large as a human hand.

The sea spider has a small, narrow body.

On top of its head, the sea spider has a knobby projection bearing two, three, or four simple eyes.

Pycnogonum is a genus of sea spiders in the family Pycnogonidae.

Colossendeidae is a family of sea spider (class Pycnogonida).

Nymphon is a genus of sea spiders in the family Nymphonidae.

Hedgpethia is a genus of sea spider, in the family Colossendeidae.

The sea spider seemed unaffected by the stinging cnidocytes of the anemone.

Nymphonidae is a family of sea spiders native to the Atlantic.

Associated with these were a large number of sea spiders in the class Pycnogonida.