1. Spiders, mites, etc. come under the head of Arachnida.

2. Individuals of the Arachnida in substrates of A. nidus and P. coronans accounted for 54.46% and 29.50% of the total, respectively.

3. Arachnida and Cecidomyidae had a higher relative abundance than other families being 0.3465 and 0.2309, respectively.

4. The energy content and their seasonal variations of Arachnida in arid environment were studied.

5. A pincer like claw of a crustacean or an arachnida lobster , crab , or scorpion.