Collectively the Ixodidae and Argasidae may be distinguished from other Acari by the presence of a median probe, armed with recurved teeth, which project forwards beneath the mouth and between the palpi, and of a conspicuous spiracular area above and usually behind the base of the fourth leg on each side. [Please select]
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Spiracular disk with only the two long ventral lobes remaining; spiracles lacking or vestigial; abdominal segments with both dorsal and ventral welts; strictly aquatic. [Please select]
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Spiracular area: the anterior of the three areas between lateral and pleural carinae on the metanotum of some Hymenoptera: =first pleural area. [Please select]
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Spiracular line: in caterpillars is that which includes the spiracles: = stigmatal. [Please select]
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Spiracular sulcus: on the metanotum of Hymenoptera, is a grooved linear channel extending from spiracle to apical margin. [Please select]
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Pleural areas: on the metanotum of some Hymenoptera, the three spaces between the lateral and pleural carinae; the 1st or anterior = spiracular area; the 2d or central = middle pleural; the 3d or posterior = angular area. [Please select]
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Tracheate: supplied with trachea: a general term applied to all articulates that breathe by means of spiracular openings into a system of tubular structures that extend to all parts of the body. [Please select]
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