Antennae and compound eyes are appendages that insects have and that arachnids lack.
Specifically, insects have three (3) pairs of legs and one (1) pair of antennae. In contrast, Spiders have four (4) sets of legs and no antennae. They also see through a series of singular, lensed eyes whereas insects have compound eyes.
What you are describing is phylum Arthropoda, which houses insects, arachnids, crustaceans, and the extinct trilobites.
Phylum arthropoda are also called jointed legged animals. They have exoskeleton and segmentations. Some good examples are crustaceans, insects and arachnids. Examples of crustaceans are crabs, crayfish, and lobster.
Arachnids. Spider group. Appendages are technically legs.
Eating and stuff
No, grasshoppers are insects which have 6 legs. The arachnids have 8 legs.
Palps are a second pair of appendages found in crustacean and insects. These appendages are located near the mouth and are used to guide food into the mouth.
insects
Mites and spiders are not insects, they are arachnids. While insects and arachnids have many similarities, they also have some obvious differences. Insects have six legs while arachnids have eight.
Scorpions are arachnids that walk with their eight appendages (legs).
chewing, eating, biting. etc.
No, they are insects.
palps