ASTIGMATA

Revision for “ASTIGMATA” created on June 25, 2014 @ 00:06:50

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ASTIGMATA
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&nbsp; <p align="CENTER"><span style="font-size: medium;"><b>ASTIGMATA</b></span></p> <p align="JUSTIFY"></p> <p align="JUSTIFY"><span style="font-size: medium;"> The astigmatid mites, as suggested by the name, are characterized by a lack of stigmata. These mites tend to be small and to have lightly sclerotized bodies. The third and fourth pairs of legs tend to exit the body some distance behind the first and second pairs of legs. The end of each leg is a tarsal segment that bears the sucker-like feet which support the mite. Some Astigmata are free-living mites that feed on organic matter. Other astigmatid mites are external feather mites of birds, live in the quills of feathers, or burrow into the skin of birds; two families are actually internal parasites of birds. The astigmatid mites contain several important parasites of large animals, e.g., </span><span style="font-size: medium;"><i>Psoroptes</i></span><span style="font-size: medium;"><i>ovis</i></span><span style="font-size: medium;">, </span><span style="font-size: medium;"><i>Chorioptes</i></span><span style="font-size: medium;"><i>bovis</i></span><span style="font-size: medium;">, and </span><span style="font-size: medium;"><i>Sarcoptes</i></span><span style="font-size: medium;"><i>scabiei</i></span><span style="font-size: medium;">.</span></p> <p align="JUSTIFY"><span style="font-size: medium;"> There are four astigmatid mites that are of importance in feline parasitology: </span><span style="font-size: medium;"><i>Otodectes</i></span><span style="font-size: medium;"><i>cynotis</i></span><span style="font-size: medium;">, the ear mite of dogs and cats; </span><span style="font-size: medium;"><i>Notoedres</i></span><span style="font-size: medium;"><i>cati</i></span><span style="font-size: medium;">, the mange mite of cats and rabbits; </span><span style="font-size: medium;"><i>Sarcoptes</i></span><span style="font-size: medium;"><i>scabiei</i></span><span style="font-size: medium;">, the mange mite of dogs, humans, and other hosts; and </span><span style="font-size: medium;"><i>Lynxacarus</i></span><span style="font-size: medium;"><i>radovskyi</i></span><span style="font-size: medium;">, the hair-clasping mite of tropical cats. These mites tned to be slow-moving and weakly sclerotized. Respiration is integumental, i.e., there are no stigmata. The largest of these mites is </span><span style="font-size: medium;"><i>Otodectes</i></span><span style="font-size: medium;">, the smallest is </span><span style="font-size: medium;"><i>Notoedres</i></span><span style="font-size: medium;">. </span><span style="font-size: medium;"><i>Otodectes</i></span><span style="font-size: medium;">, </span><span style="font-size: medium;"><i>Sarcoptes</i></span><span style="font-size: medium;">, and </span><span style="font-size: medium;"><i>Notoedres</i></span><span style="font-size: medium;"> are similar to each other in appearance. These are rather dorsally compressed and round mites that have short legs which terminate in sucker-like feet typical of the astimatid mites. Although the legs of </span><span style="font-size: medium;"><i>Lynxacarus</i></span><span style="font-size: medium;"> also terminate in sucker-like feet, the general appearance of this mite is much different than that of the other three found on cats. The body of </span><span style="font-size: medium;"><i>Lynxacarus</i></span><span style="font-size: medium;"> is elongate and appears laterally compressed. </span><span style="font-size: medium;"><i>Otodectes</i></span><span style="font-size: medium;"><i>cynotis</i></span><span style="font-size: medium;"> is usually found in the ear canal where the mites wander around on the surface of the skin, </span><span style="font-size: medium;"><i>Notoedres</i></span><span style="font-size: medium;"><i>cati</i></span><span style="font-size: medium;"> is found in burrows in the skin (usally on the ears and face), and </span><span style="font-size: medium;"><i>Lynxacarus</i></span><span style="font-size: medium;"><i>radovskyi</i></span><span style="font-size: medium;"> is found clinging to the hairs of the cat (often around the anus and on the tail); </span><span style="font-size: medium;"><i>Sarcoptes</i></span><span style="font-size: medium;"><i>scabiei</i></span><span style="font-size: medium;"> is only rarely found on cats.</span></p> <p align="JUSTIFY"></p> &nbsp;
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June 25, 2014 @ 00:06:50 Anastasia Bowman

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