Up: Blattella germanica - http://bugguide.net/node/view/121385
Blattella germanica, also known as the German cockroach, has two major immune system points: granulocytes and plasmatocytes. Granulocytes (GR) is a part of capturing and performing phagocytosis on foreign tissue. It will wrap around the tissue and begin the process. The GRs are flattened cells with organelles that resembles microtubules and squeeze the foreign tissue. However, the GRs' microtubules do not retract after use on their own. To retract these, the plasmatocytes. The plasmatocytes help control the amount of GRs by compressing the microtubules and destroying GRs if they become overpopulating in the body.