Insects {arachnid}| (Arachnida) can respire by tracheae or book lungs, have simple eyes, have poison claws on head, have eight legs, have no antenna, be carnivores, and be chelicerates. Spider, scorpion, tick, and mite are arachnids.
Arachnids respire by tracheae or by membranes that look like books {book lung}.
Large black spiders {black widow spider} have neurotoxic poison.
Mites {chigger} can be skin infesting.
Arachnids {daddy longlegs} can have long legs and small bodies.
European water mites {diving spider} (Argyoneta aquatica) can make underwater webs.
Spiders {jumping spider} can have 2000 retina receptors but no ganglion cells. Main eye has fovea with 30 cells 10 arc-minutes apart. Main eyes scan objects from one side to another for 1 to 2 seconds. If no recognition, scan repeats. Main eye can rotate 25 degrees for 5 to 15 seconds to learn line orientation. Objects detected are other jumping spiders, small and moving prey, big and coming close predator, or objects to investigate further. Other eyes detect movement and initiate saccades, based on angle between stimulus and body axis. Other eyes take 100 milliseconds to check if saccade succeeds.
Arachnids {mite, arthropod} (Acarina) can be small.
Arachnids {scorpion} can have high curving tails with poisonous sting.
Arachnids {spider, insect} can have eight legs and two body parts and make webs.
Large fuzzy spiders {tarantula} can bite.
Arachnids {tick} can be blood-sucking.
Black widow spider, Australian red-back widow spider, and brown widow spider {widow spider} (Latrodectus) have neurotoxic poisons.
4-Zoology-Kinds-Arthropod-Insect
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Date Modified: 2022.0225