Tanystylum has reduced palps and chelae. Nymphon has palps and chelae. There is no special respiratory structure in pycnogonids and gasses are exchanged across the general body surface and gut wall. Blood Vascular System dorsal ostiate heart Excretory System no system, Nervous System typically arthropodan with circum enteric ring and paired ganglia for each leg somite no deuterocerebrum 4 eyes on ocular tuberculke provide 360 degree vision. Reproductive System Pycnogonids are dioecious.
Reproductive system extends into the logn joints of the legs.
Males have glandes on dorsal surface of femora tha secrete substance to bind eggs together in mass after fertilization. The larva is a protonymphon. Larva supressed in some species. The information contained herein is not guaranteed to be free of error. Lander University has neither examined nor approved the content of this page.