. A manual of zoology. Zoology. II. ACERATA: LINGUATULIDA 397 into a sucking beak. This consists of a tube formed by the basal joints of the pedipalpi, in which the chehcerx, either chelate, clawed, or stylet-like, play Since the mites are small and half or wholly parasitic, they are much simplified in structure. Frequently heart and trache£e are lacking. The larva as it escapes from the egg lacks the last pair of legs and then closely resembles certain imperfectly segmented parasitic insects like the lice. The red mites () and water mites, HYDRACHNlDa; (Hydraclma* Atax'^'), are f
. A manual of zoology. Zoology. II. ACERATA: LINGUATULIDA 397 into a sucking beak. This consists of a tube formed by the basal joints of the pedipalpi, in which the chehcerx, either chelate, clawed, or stylet-like, play Since the mites are small and half or wholly parasitic, they are much simplified in structure. Frequently heart and trache£e are lacking. The larva as it escapes from the egg lacks the last pair of legs and then closely resembles certain imperfectly segmented parasitic insects like the lice. The red mites () and water mites, HYDRACHNlDa; (Hydraclma* Atax'^'), are free-living as adults, but parasitic as young. The Ixodid/e or ticks (Ixodes*), attack man and other mammals, burrowing beneath the skin, sucking. Fig. Fig. Fig. 430. Fig 431. 430.—Sarcoptes scabei, female itch mite (after Leuckart). 431.—Demodex follicidoriim, foIUcle mite (from Ludwig-Leunis). the blood. Their relation to disease is referred to on p. 190. The much smaller males are attached to the females and take no food. Argas persiciis, of eastern lands, with habits like a bedbug, is poisonous. , parasitic, Gamasiis* on beetles, Dermanyssus* on bats. The Acaeid^ include permanent parasites \\]!ie Sarcoptes scabei* (fig. 430), the cause of the 'itch,' and closely allied cheese mite. The follicle mite, Demodex foUioulorum* lives in the sebaceous glands of various mammals, including man (fig. 431). Order III. Linguatulida. Elongate mites like Demodex lead to the Linguatulida, which as adults live in the frontal sinuses of carnivorous mammals, as encysted young in the liver of herbivorous forms, especially rodents. The body is long, flattened and ringed, and somewhat tapeworm-like (fig. 113). The adults have the mouth at the base of a chitinous capsule, and on either side are two hooks regarded as the claws of the first and second legs. Inside the body is a spacious cavity traversed by the ali- mentary canal which is without appendages. The nervous system is large
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1912
