Arachnids

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by melgarnu
Last updated 5 years ago

Discipline:
Science
Subject:
Zoology

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Arachnids

Arachnids have eight articulated legs in the abdomen

The cephalothorax contains sense organs, mouthparts, and limbs in pairs. - The first pair of limbs are called chelicerae and are used as pincers or poison fangs- The second pair are called the pedipalps and serve as pincers, feelers, or legs.

ARACHNIDS

Arachnnids feeding

Arachnids respiration

Some arachnids breathe through "book lungs". Others breathe through a "tachea system", like insects. The tracheal system consists of many small internal tubes called tracheae that branch throughout the insect body. The tracheae open to the outside through holes called spiracles

Arachnids have an exoskeleton. They have bilateral symmetry. Their body is divided into two parts: cephalothorax and abdomen

The bites of some spiders and the stings of a few species of scorpions are dangerously poisonous to humans.

Unlike insects, spiders an scorpions don't have antennae

The digestive system is complete, containing mouth and anus. Arachnids are predators on insects and other invertebrates. Most of them can only eat liquid food, not solid food, so they inject poison into their prey and suck out the juice.

Spiders produce silk from their spinneret glands located at the tip of their abdomen. The silk is used to built up webs, which allow spiders to catch prey without having to expend energy by running it down

Arachnids reproduce sexually. Some are oviparous and other viviparous. They don't undergo methamorphosis.

The tracheal system branches into progressively smaller tubes.

Scorpions possess two basic weapons for defense and attack: their menacing pincers. They also have a tail to sting his prey, injecting toxic venom.

Spiders and scorpions

https://www.youtube.com/watch?v=Ty-tZ7-TzSM


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