1
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:
EXPLANATION
Acarology
- 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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