Spiclers and scorpions are very different from each other but are placed in same phylum arthropoda give reason

Spiclers and Scorpions are very different from each other but are placed in same Phylum Arthropoda because

They have jointed legs
They have an exoskeleton
They have a open circulatory system.

Arthropods are joint-legged animals and you must have come across a few of these animals. Some prominent ones include insects, spiders, ants, bees, crabs, shrimps, millipedes, centipedes etc. Scientifically speaking, they all come under the Animal Kingdom under phylum Arthropod.

Characteristic features of Phylum Arthropod

The body structure shows bilateral symmetry. They are triploblastic. They can be found in all types of habitats – land, water and soil. They have jointed limbs. The body is segmented into three regions – Head, Thorax and Abdomen. The body cavity is filled with blood and is called the haemocoel. The blood is white in color. The exoskeleton is hardened and is made of chitin. They have a well-developed central nervous system. The head is well developed and bears the sensory organs and brain. They have compound eyes and mosaic vision. The digestive tract is complete with the mouth and anus at opposite ends of the body. They have an open circulatory system with dorsal heart and arteries. Respiration is through the general body surface or by gills in aquatic forms and through trachea or book lungs in terrestrial forms. Sexes are separate and sexual dimorphism is exhibited.

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Because they both are insects..

Because they both have 6 legs

Spiders and scorpions are different species of the same phylum Arthropoda. They both are different, but they have many characteristics in common, such as they both have jointed 6 legs, coelomic cavity filled with blood, open circulatory system, etc.

Spiders and scorpions being different from each other are placed in the phylum arthropoda because of the following reasons:

They have jointed appendages.
Segmented body
Body covered by exoskeleton
They have open circulatory system.