Internal Features

Apart from bearing the pedipalps and the mouthparts, the gnathosoma is little more than a tube through which the foregut passes into the idiosoma. It does not contain a brain, the nervous system of a mite being located within the propodosoma and, typically, forming a ring of nervous tissue (the central nerve mass) around the pharynx. The alimentary canal includes a pharynx, an elongated oesophagus, a mid-gut (ventriculus) and a hindgut, the anterior part of which may include several Malpighian-like tubules.

pedipalp chelicera gnathosoma propodosoma idiosoma <j

^ hysterosoma

Fig. 166 General structure of a mite.

pedipalp chelicera propodosoma

^ hysterosoma

gnathosoma sejugal furrow sejugal furrow

The respiratory system varies considerably. Mites with a tracheal system have spiracular openings (stigmata) whose number and position on the body may vary from order to order. Mites that lack a tracheal system effect gaseous exchange thorough their integument.

The reproductive organs are located mid-ventrally within the idiosoma, their exact position varying considerably. In some mites they lie close to the tip of the hysterosoma (i.e. they occur distally); in others they may occur immediately just behind the gnathosoma at the anterior part of the propodosoma (i.e. they occur proxi-mally). In eriophyid mites, they are located at the anterior part of the hysterosoma, just behind the coxae and, in females, are concealed by a distinctive flap (genital flap), the features of which (microscopically) are often of taxonomic value.

Building Your Own Greenhouse

Building Your Own Greenhouse

You Might Just End Up Spending More Time In Planning Your Greenhouse Than Your Home Don’t Blame Us If Your Wife Gets Mad. Don't Be A Conventional Greenhouse Dreamer! Come Out Of The Mould, Build Your Own And Let Your Greenhouse Give A Better Yield Than Any Other In Town! Discover How You Can Start Your Own Greenhouse With Healthier Plants… Anytime Of The Year!

Get My Free Ebook


Post a comment