. A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). TYPE AUACUNIDA. 463 7. Order Acarina. The Acarina are for the most part small forms, many being almost microscopic, while the largest, the Ticks {Ixodes), do not when at their greatest size exceed a centimeter in length, the males being much smaller. Some forms, such as (h'ihates and Nothriis, live among moss and in similar situa- tions, while others, such as Uydrachna and Atax, are aquatic. Many forms are, however, parasitic either upon plants (Te- tranychus and Phytop
. A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). TYPE AUACUNIDA. 463 7. Order Acarina. The Acarina are for the most part small forms, many being almost microscopic, while the largest, the Ticks {Ixodes), do not when at their greatest size exceed a centimeter in length, the males being much smaller. Some forms, such as (h'ihates and Nothriis, live among moss and in similar situa- tions, while others, such as Uydrachna and Atax, are aquatic. Many forms are, however, parasitic either upon plants (Te- tranychus and Phytoptus) or on animals, the genus Sarcoptes being the cause of the disease termed the Itch in man, the symptoms being produced by the Mites burrowing beneath the skin. Other forms affect various animals and birds, the genera DermaleichiiSf ATialgea, etc., feeding upon the feathers. Fig. 208.—A, Sarcoptes scnbiei; B, Demodex phyllot'den (after Csokor from Wrkiht). of various birds, while others, such as Democlex (Fig. '208, 7?), live in the hair-foUicles or sebaceous glands of the skin, i)ro- ducing acnelike pustules. The larvro of many forms wliiih are non-p jfa^itic in adult life have a parasitic habit, as for instance the larvfo of nianv of the Water-mites and of the Harvest-mites [Trombidium), while other forms live upon orgai'ic matter of various kinds, as does the Cheese-mite, Tyrog/ A. distinguishing characteristic of the Acarina is the ab- sence of any segmentation and the fusion of head-thorax and abdomen to a siugh) mass (Fig. 208, ^1). The form of the appendages varies greatly in different genera according to the use to which they are put. The chelicerro (Fig. 209, Md) are. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original McMurrich, J. Playfair (James Playfair), 1859-1939. New York : H. Hol
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