Spiders (order Araneae) are air-breathing arthropods that have eight limbs, chelicerae with fangs generally able to inject venom, and spinnerets that extrude silk. They are the largest order of arachnids and rank seventh in total species diversity among all orders of organisms. Spiders are found worldwide on every continent except Antarctica, and have become established in nearly every land habitat.
1*Bipasha Pal, 1Rudra Pratap Sen, 1Ajoy Mondal, 1Shankha Bhattacharyya, 2Dr. Dhrubo Jyoti Sen (Fri,) studied this question.