Blood cells (hemocytes, SGC, and GC) of the freshwater crayfish P leniusculus. Hemocytes were collected and separated according to Wu et al⁶  and stained with May-Grünvald eosin followed by Giemsa. (A) SGC, semigranular hemocytes; and (B) GC, granular hemocytes; bar = 10 μm.