Sarcoptes scabiei

Definition

A minute burrowing mite (Arachnida: Sarcoptiformes: Sarcoptidae) that parasitizes mammalian skin, causing the contagious dermatosis scabies. The species comprises host-adapted varieties (formerly treated as subspecies) including var. hominis on humans, var. canis on dogs, and var. suis on pigs; cross-infestation between host species is possible but sustained transmission typically requires host-specific strains. Females tunnel 0.5–5 mm into the stratum corneum to lay eggs, triggering intense pruritus and secondary bacterial infection. The mite completes its entire life cycle within the epidermis.

Etymology

New Latin: Sarcoptes (from Greek sarx 'flesh' + koptein 'to cut') + scabiei (genitive of scabies 'itch, mange')

Example

In veterinary diagnostics, skin scrapings from a dog with ventral alopecia and pruritus are examined microscopically for Sarcoptes scabiei var. canis; observation of the mite's rounded body, short unsegmented legs, and dorsal spines confirms sarcoptic mange.

Synonyms

• itch mite

Related Terms

• Scabies
• Sarcoptidae
• Sarcoptiformes
• acarology
• mange
• Zoonosis
• Ectoparasite

Usage Notes

The Linnaean authority is disputed (Linnaeus 1758 vs. DeGeer 1778). In clinical and epidemiological contexts, 'scabies' refers to the disease while Sarcoptes scabiei denotes the agent. Varieties are increasingly treated as host races rather than formal subspecies. Differentiation from Notoedres cati (feline scabies) and Demodex spp. relies on body shape, leg length, and anus position.