Newไรที่มีความสำคัญทางสัตวแพทย์18-10-62

Diagnosis (female)

Diagnosis (Male)

Canine Scabies (Sarcoptic scabeie) • Sarcoptes scabiei var. canis adult female mite from skin of a dog • Note; dorsal scale and cone shaped dorsal spine > male

Canine Scabies (Sarcoptic scabeie) • Note: long unjointed pedicels (stalks) with sucker at end on legs 1 & 2

Canine Scabies (Sarcoptic scabeie) • Sarcoptes scabiei var. canis adult male mite from skin of a dog • Note; dorsal scale and cone shaped dorsal spine < female • Epimere 3-4 more ridge

Canine Scabies (Sarcoptic scabeie) • Note: long unjointed pedicels (stalks) with sucker at end on legs 1, 2, 4

Sarcoptes sp., dorsal view (left; stack of 23 exposures), ventral view (right; stack of 10 exposures), 200x magnification, 100 μm scale bar (© Lance Wheeler, 2018 | Photographer: Lance Wheeler | Owner of Specimen: Texas A&M College of Veterinary Medicine, Department of Veterinary Pathobiology)

Knemidocoptes sp. • Knemidocoptes sp. found on a budgie • This is a burrowing mite known as the Scaly Face or Scaly Leg mite of birds. • ssTmihmeaiylllahsrtatuvobeSbaayrRcleoogupsnt.eds bwoidthy • Females have no sucker

Knemidocoptes mutans

Knemidocoptes mutans

Knemidocoptes mutans

Psoroptes ovis

Psoroptes ovis • Psoroptes ovis - Adult female mite from a sheep • Note the long legs & long jointed pedicels with suckers • S1,S2,S4

Psoroptes ovis • Note the long legs & long jointed pedicels with suckers

Psoroptes ovis • Sheep scab

Prevention and control

Psoroptes cuniculi (rabbit ear mite)

Psoroptes cuniculi • rabbit ear mite

Adult female mites Chorioptes (left), Psoroptes (centre) and Sarcoptes (right). The inserts show the characteristic pedicels and suckers that aid species differentiation.

Chorioptes sp. • Chorioptes sp. from a cow- Adult male. • Note: the short unjointed pedicels with suckers • S1,S2,S3, S4 • Leg 4 reduced

Chorioptes sp. • Chorioptes sp. from a cow- Adult female. • Note: the short unjointed pedicels with suckers • S1,S2,S4

Chorioptes sp. • Chorioptes sp. • Note: the short unjointed pedicels with suckers

Otodectes cynotis (ear mite) • Otodectes cyanotis mites male (top) and female (bottom). • It is not unusual to see them under the microscope “joined together”

Dog ear mite

Otodectes cyanotis • Otodectes cyanotis - adult male mite from the ear of a dog

Otodectes cyanotis • Note: short unjointed pedicle with sucker at the end on each leg.

Otodectes cyanotis

Genus Egg-laying Female Male Anus termi Sarcoptes Short leg Short leg nal S1 , S2 S1 , S2 , S4 on long-unjointed dorsa on long-unjointed pedicel l pedicel Notoedres Short leg termi S1 , S2 Short leg nal S1 , S2 , S4 on long-unjointed pedicel on long-unjointed termi nal Knemidoco Long leg pedicel ptes No suckers termi Long leg nal Psoroptes Long leg S1 , S2 , S3 ,S4 S1 , S2 , S4 on long-unjointed on long-jointed pedicel pedicel Chorioptes Long leg S1 , S2 , S4 Long leg on short-unjointed S1 , S2 , S3 on long-jointed pedicel pedicel Long leg, Leg 4 reduced S1 , S2 , S3 ,S4 on short-unjointed pedicel

Demodex canis • Phylum Arthropoda • Class Arachnida • Order Acari • Suborder Prostigmata • Family Demodicidae

Demodex canis

Demodex canis



Diagnosis

Adult, Larva, Egg



Histopath

Gamasid mites • Live in a wide range of terrestrial ecosystems • Almost all are predators • Small arthropods • Arthropod eggs • Nematodes • A few are parasitic mites



Gamasid mites • Very small (0.12 mm. long) to large (4 mm.) mites with a pair of stigmata openings above legs III-IV

Gamasid mites • Usually associated with a peritreme canalcoxa II

Gamasid mites • Flagellate tritosternum present

Gamasid mites • Sternal plate and genito-ventral plate present

Gamasid mites • The mouth organs are designed for biting or puncturing and sucking • The chelicerae have pincers or are needle-shaped

Gamasid mites • The mites breathe through trachea, which open through spiracles on the sides of the body • The body has many bristles, which are constant in number and position

General structure of gamasid mite chelicepraalpeus sternal plate genito- ventral plate anal plate



General structure of gamasid mite tectum chelicerae palpus hypostome peritreme tritosternum spiracle sternal plsapteiracle coxa trochanter genito-ventral plate femur patella metapodal plate tibia tarsus anus anal plate

Gamasid mites and others 1. Laelaps echidnina 2. Laelaps nutalli 3. Dermanyssus gallinae 4. Ornithonyssus spp. 5. Megninia spp. 6. Chigger mite

Laelaps spp. chelicerae sternal plate genito-ventral plate anal plate anus

Laelaps spp. chelicerae sternal plate Genito-ventral plate anal plate anus