
1) Arachnid anatomy
Found on
https://www.crosswordclues.com/clue/gnathosoma

The gnathosoma (from Greek γνάθος, gnáthos = `jaw` and σώμα, sóma = `body`) is the part of the body of the Acari (mites and ticks) comprising the mouth and feeding parts. These are the hypostome, the chelicerae and the pedipalps. It is also called the capitulum (however, this word also has other meanings). It is separated from the ...
Found on
http://en.wikipedia.org/wiki/Gnathosoma

(from the article `acarid`) ...by the lack of body segmentation, although it is secondarily developed in a few families. This is a characteristic shared only with the spiders ...
Found on
http://www.britannica.com/eb/a-z/g/40

The anterior part of the body of mites and ticks which bears the mouth and mouthparts.
Found on
http://www.earthlife.net/insects/glossary.html
No exact match found.