Otodectes cynotis
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Otodectes cynotis |
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| ( Hering , 1838) |
Otodectes cynotis is a parasitic living mites and pathogens of ear mite . It is a worldwide species of the mange mite in predators (Carnivora). A temporary transition to humansis also rarely possible as a zoonosis .
features
O. cynotis has a wrinkled body cover . The first two pairs of legs have adhesive plates attached to the tarsi on a short sticky handle. The third and the much shorter fourth pair of legs have two long bristles and protrude over the side of the body. Females are 400 to 500 µm long and 270–300 µm wide, males are significantly smaller at 315–395 × 210–295 µm. The gnathosoma is slightly longer than it is wide. The opisthosomal lobe of male mites protruding from the posterior margin is relatively small.
O. cynotis pierces the epidermis with its chelicerae and feeds on the exiting tissue fluid and lymph .
Reproduction and development
The female sticks the eggs to the epidermis of the ear canal. They are white, oval, slightly flattened on one side and 166–206 µm long. The development from an egg through a six-legged larva and two eight-legged nymph stages (proto- and deutonymph) to an adult mite takes about three weeks. The nymphs are 138–224 µm long. The males always copulate with the female deutonymphs, but the actual fertilization only takes place shortly before the molt to the adult female. The eggs are laid between the second and tenth day after mating, with a female laying 15 to 20 eggs during this time. If the female deutonymphs are not mated, the resulting females are sterile.
Hosts
O. cynotis primarily colonize the skin of the auricles and the external auditory canals. Cats and foxes in particular, but also dogs and martens are carriers of these ectoparasites . The transmission to humans is only known from a few cases in the literature. Just three mites can cause ear canal inflammation (ear mange), there are also asymptomatic carriers. Outside the host, the mites can presumably survive in the environment for months.
literature
- Wieland Beck and Nikola Pantchev: Parasitare Zoonoses , Schlütersche Verlagsgesellschaft, 2009, ISBN 978-3-8426-8032-6
- Josef Boch and Rudolf Supperer: Veterinary Parasitology . Paul Parey, 3rd ed. 1983, p. 408.
- Eduard von Hering : The herb mites of animals and some related species, described after own investigations . In: Nova Acta Leopoldina, 18, 1838, pp. 573–624 ( digitized version )
Web links
Individual evidence
- ↑ a b Beck, Pantchev: Parasitäre Zoonosen , Chapter 2.1.3, Pages 23 to 25, Googlebooks online
- ↑ Wieland Beck, Nikola Pantchev: Practical Parasitology in Pets: Small Mammals - Birds - Reptiles - Bees . Schlütersche, 2012, ISBN 978-3-8426-8363-1 , p. 132.
- ^ Dwight D. Bowman, Charles M. Hendrix, David S. Lindsay, Stephen C. Barr: Feline Clinical Parasitology . John Wiley & Sons, 2008, ISBN 978-0-470-37659-1 , p. 390.
- ^ Richard G. Harvey, Joseph Harari, Agnès J. Delauche: Ear diseases in dogs and cats: Basics - Diagnostics - Treatment . Schattauer Verlag, 2003, ISBN 978-3-7945-2235-4 , p. 78.