Therefore, the females release a pheromone (3,5,9-trimethyldodecanal) produced by cephalothoracic gland and attract the males.

Agnostida do not have an articulating half-ring, resulting in an opening between the thorax and the cephalon when enrolled, called cephalothoracic aperture.

When Agnostina are enroled, an tiny opening between the cephalon and the thorax becomes visible (the cephalothoracic aperture) that uniquely distiguishes this group from the Eodiscina.

Benign symmetric lipomatosis (also known as Benign symmetric lipomatosis of Launois-Bensaude, Madelung's disease, multiple symmetric lipomatosis and cephalothoracic lipodystrophy) is a cutaneous condition characterized by extensive symmetric fat deposits in the head, neck, and shoulder girdle area.