Biology

Difference between insects and arachnids

Main difference

The main difference between insects and arachnids is that the insect is an invertebrate with three body segments, compound eyes and a pair of antennae, while arachnids are invertebrates that have two body parts, simple eyes and no antennae.

Insects vs. Arachnids

Insect is a Latin word and arachnid is a Greek word. Insects belong to the class Insecta; on the other hand, arachnids are members of the Arachnida class. Insect eyes are compound, while arachnids have simple eyes. The insect has an antenna in the head region; on the other hand, the antennae are absent in arachnids. Insects have three pairs of appendages; by contrast, arachnids have four pairs of appendages.

The body parts of insects are the head, thorax, and abdomen, while the cephalothorax and abdomen are two body segments of arachnids. Most insects have developed wings; on the other hand, arachnids lack wings. Insects move by swimming, walking, or flying; on the other hand, arachnids move by crawling or crawling.

Insects go through a complete developmental process by metamorphism, while arachnids undergo incomplete metamorphism. Insects have about 10 million species; on the other hand, the species of arachnids are roughly a lac. Insects can exist in all habitats, while most arachnids live on land. Insects use the trachea as a breathing organ; on the reverse side, the organs for respiration in arachnids are the trachea and book lungs. Insect blood is colorless, while arachnids have blue-colored blood. Some examples of insects are beetles, ladybugs, ants, bees, butterflies, and mosquitoes. Spiders, ticks, mites, scorpions; on the other hand, harvesters are some examples of arachnids.

Comparative chart
Insects Arachnids
Insects are small animals categorized as invisible up to 7 inches long. Arachnids are small, creepy, and crawling animals.
Word
Latin Greek
Eyes
Compound eyes One to six pairs of simple eyes
Antennas
A pair of antennas Do not
Legs
Six Legs
Body segments
Three Two
At
Most insects have wings. Wingless
Appendices
Mandible Chelicerae
Metamorphism
Complete metamorphism Incomplete metamorphism
Class
Insect Arachnida
Species
six to ten million A species named lac
Habitat
It exists in the whole environment Mainly terrestrial
Breathing
Windpipe Trachea and book lungs
Blood
Colorless blood Blue blood
Examples
Beetle, flies, butterflies, fleas Spider, tick scorpions, harvesters

What are insects?

An insect are small microorganisms categorized as hexapod invertebrates. The class Insecta is the most important class of phylum arthropods. Some of the characteristics that make it unique to the species are a hard exoskeleton made of chitin; the body has three segments: head, thorax and abdomen, six legs, a pair of antennae on the head, and compound eyes. Insects are a more widespread group of animals. Its population is between six and ten million and represents half of all living creatures. Insects make up about 90% of all animals on earth.

Insects exist in all environments, whether terrestrial, freshwater or marine. Most organisms reside in land and fresh water, while there are fewer species in seas and oceans. Every insect begins its life from the hatching of the eggs. The developmental stages start from the exoskeleton and a series of its molts called molts. Insects go through a three-stage metamorphism or four-stage metamorphisms. Third stage metamorphism lacks the pupal stage. Insects are believed to have evolved with flowering plants.

Insects move in three ways: walking, swimming, or flying. Insects are those invertebrates that have developed the characteristic of flying with wings. Some insects spend their entire lives underwater. Insects live alone, while some of them reside in social groups such as bees, flies, ants, and termites. In the human area, insects are a pest, eradicated by insecticides. But the fact is, insects are useful in many ways. They are a source of pollination in flowering plants.

What are arachnids?

Arachnid is a Greek word that is believed to be organized from a myth. The myth says that the human weaver Arachne was turned into a spider by God. Arachnids belong to the subphylum Chelicerata classified in the class Arachnida. Arachnids are small invertebrates with jointed legs. These animals have four pairs of legs. Some species can develop pairs of front legs as a sensory function; in some species, the appendages even grow very large. These jointed appendages give the appearance of additional legs. The most important order of the Arachnida class is a spider.

The body of arachnids has two parts: cephalothorax and abdomen. Arachnids lack wings. However, some species can fly with the wind with the help of silk fibers. Some species use silk as a weapon to catch prey or apply it for reproduction. Arachnids lay eggs, babies grow slowly and resemble adults. Arachnids have a hard exoskeleton made of a material resistant to chitin. Arachnids can reside in all habitats. Most species live on land and some are water dwellers. Arachnids can eat everything, liquid and solid food. They are predators of the bodily juices of the prey.

Key differences

  1. Insects are small creatures that vary in length, while arachnids are small, crawling creatures that belong to arthropods.
  2. The insect is a term that originated in the Latin language; conversely, arachnids is a Greek word.
  3. The insect has compound eyes; on the other hand, arachnids have simple eyes.
  4. An insect is recognized as having a pair of antennae, while arachnids lack antennae.
  5. Insects have three pairs of legs; on the other hand, there are four pairs of legs in arachnids.
  6. Insects have three body parts: head, thorax, and abdomen, while arachnids have two body segments: cephalothorax and abdomen.
  7. Most insects have wings that help them fly; by contrast, arachnids do not have wings.
  8. Insects have pairs of appendages near the mouth; on the other hand, arachnids have pairs of appendages near the mouth called Chelicerae.
  9. Insects go through a whole series of metamorphisms; on the other hand, arachnids go through the series of molts and the process of metamorphism is not complete.
  10. Insects belong to the class Insecta; in contrast, arachnids are members of the class Arachnida.
  11. The insect has millions of species; on the other hand, arachnids have a kind of lac.
  12. Insects are widespread in all types of habitat; on the contrary, arachnids are mostly terrestrial.
  13. Insects breathe through the windpipe; on the other hand, arachnids breathe through the windpipe and lungs of books.
  14. Insects have colorless blood; on the contrary, arachnids have blue colored blood.
  15. Insects are classified as flies, butterflies, and fleas; on the other hand, arachnids are classified as ticks, mites, and spiders.
Final Thought

Insects and arachnids are invertebrates and belong to the arthropod phylum. Insects are small animals with three body segments and wings to fly. Arachnids have two body segments and do not have wings.

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