Q.26
Which of the following statements are correct regarding Psoroptes spp.?
(A). They are also called burrowing mites.
(B). Members are responsible for scab formation.
(C).Alll legs are projected beyond body margin
(D). They are oval in shape with no scales and spines
Choose the correct answer from the options given below:
- Characteristics of the Genus Psoroptes:
- Psoroptes species (Psoroptes ovis, P. cuniculi) are non-burrowing surface mites. They pierce the skin with pointed chelicerae at the base of wool/hairs rather than tunneling into the stratum corneum (burrowing mites belong to the family Sarcoptidae, e.g. Sarcoptes scabiei). Statement (A) is False.
- Piercing causes serum exudation, coagulating with mite feces and epithelial debris to form thick scabs (sheep scab). True.
- Long, jointed legs project visibly beyond the body margin with segmented pretarsi bearing trumpet-shaped suckers. True.
- The body is oval without dorsal spines or triangular scales (unlike Sarcoptes which has dorsal spines). True.
- nalysis:
- Statements (B), (C), and (D) are correct. Hence, Option 3 is correct.
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