23. Beak jointed (23 A). ORDER HEMIPTERA....................................................DEBUG
Beak not jointed (23 B)....................................................................................24
24. Mouthparts retracted into head (24 A). ORDER ANOPLURA.................SUCKING LOUSE
Mouthparts not retracted into head (24 B). ORDER DIPTERA..........KED OR LOUSE FLY
25. Abdomen well developed (25 A). CLASS ARACHNIDA..............................................26
Abdomen peg-like (25 B). CLASS PYCNOGONIDA..................................SEA SPIDER
Figure 2-2. Standard identification key (continued).
MD0170
2-12