By M. W. Service (auth.)
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Extra info for A Guide to Medical Entomology
Fig 4· 7 Diagram of the head of a female culicine mosquito to show the components of the mouthparts dissected from the labium. 6). A pair of trilobed salivary glands, situated ventrally in the anterior part of the thorax (figure 2. I I), pumps saliva down through the salivary ducts which unite to form a single duct which passes down the entire length of the hypopharynx. Saliva contains anticoagulins and /or haemagglutinins which prevent the blood from clotting and obstructing the mouthparts as it is sucked into the stomach.
Introduction to mosquitoes single pair on the thorax come into contact with the water surface and aid in keeping the larvae parallel to the surface. On either side of abdominal segment eight there is a group of spines which are joined together at their base to form a structure called the pecten, which is best seen in lateral view (figure 4 · 17). All these structures identify larvae as belonging to the genus Anopheles. Anopheline pupae The respiratory trumpets are short and broad distally, thus appearing conical (figures 4· I I and 4· I Sa) whereas in most Culicinae the trumpets are narrower and more cylindrical.
The numbers and arrangement of the spiracles and form of the respiratory system is used in classifying the subclass Acari into various subdivisions and orders. Metamorphosis in the subclass Acari Nearly all medically important mites and ticks lay eggs, but mites of the genus Pediculoides ( = Pyemotes) produce adults. Eggs of mites and ticks hatch to produce a developmental stage that resembles the adult but is much smaller and has only three pairs oflegs, and which is known as the larva. 3). There may be one or several nymphal stages before the adult stage is reached.
A Guide to Medical Entomology by M. W. Service (auth.)