SCABIES 



MOUTH PARTS, PEDICELS & SUCKERS 



If 



(Comparative Features) 

 SARCOPTES 



• BOD^ - Rounded, short, backward projecting spines 

 on dorsum 



• MOUTHPARTS- Blunt 



• PEDICELS (LEG STALKS)- Long and unjointed- 

 third and fourth pair of legs do not usually extend 

 beyond rim of body 



• SUCKER DISKS- On legs I, 2 of female; legs 1, 2, 

 4 of male 



• MAXIMUM SIZE- Female, about 0.50mm.; male, 

 about 0.30mm 



M 



3C 



CHORIOPTES 



• BODY- Oval, compressed laterally 



• MOUTHPARTS- Blunt 



• PEDICELS (LEG STALKS) - Short and unjointed- 

 third pair of legs extend from the indentation in the 

 body wall 



• SUCKER DISKS- On legs 1,2,4 of female; legs 1,2, 

 3, 4 of male 



• MAXIMUM SIZE- Female, about 0.40mm.; male, 

 about 0.35 mm 



PSOROPTES 



• BODY -Oval 



• MOUTHPARTS- Sharp, piercing, and elongated 



• PEDICELS (LEG STALKS) -Long and jointed 



• SUCKER DISKS- On legs 1,2,4 of female; legs 1,2, 

 3 of male 



• MAXIMUM SIZE- Female, about 0.80mm.; male, 

 about 0.70mm 



APHIS 91-19 



(Formerly APHS 91-2) 



. . c . February 1974 



Vetermary Services ' 



Animal and Plant Health Inspection Service 



U.S. DEPARTMENT OF AGRICULTURE 



U S GOVERNMENT PRINTING OFFICE : 1974 — 531-882 



