Dermacentor andersoni Stiles, 1908. OTHER COMMON NAMES
English: Paralysis tick, Rocky Mountain spotted fever tick. PHYSICAL CHARACTERISTICS
Includes a large collection of diverse types of mites, chiggers, and ticks; carries parasites and disease; has adult length of 0.08-0.65 in (2.1-16.5 mm). Specifically, unengorged females have length of 0.11-0.21 in (2.8-5.4 mm), adult males a length
of 0.08-0.24 in (2.1-6.1 mm), and engorged females a length of up to 0.65 in (16.5 mm) and a width of up to 0.45 in (11.4 mm). The body, covered with hard protective covering, is pear shaped, and is dorsoventrally flattened (top to bottom). Immature instars and adult females possess a strong pro-dorsal scle-rite, with the opisthosoma being covered with soft cuticle to permit engorgement. Holodorsal shield is found on adult males; posterior idiosoma is flattened, anterior gnathosoma is articulated. Tectum is well developed. Coxal glands are absent, and water control is performed through salivary glands.
Color of adult females is reddish brown with grayish white dorsal shield (scutum) near front of body, which changes to grayish color when engorged; adult males are spotted with brown and gray, and do not have distinctive white shield; they possess simple eyes, located on the margin of scutum. Capitu-lum is apparent from above; basis capitulum is rectangular in shape with sides not laterally produced and approximately length of mouthparts. There are 11 abdominal festoons. Anal groove is located posterior to anus. Broad spiracular plates, located on underside of body, possess blunt process that usually reaches dorsum; goblets, located within spiracular plates, are moderate in size and number.
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