Class Insecta (the insects) under Arthropoda seems to have the highest count on earth. Even approximating the count is difficult but estimates amount up to ten quintillion (10,000,000,000,000,000,000) individuals alive at any one moment.
Arthropoda itself has the greatest number of animal species described of any phylum, at over one million. Of any of these, krill are estimated at having the highest total biomass, something over a half billion tonnes (Note that non-animal biomass, for example bacteria or plants, is higher).
Arthropod
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Spiders are part of group of animals called arachnids which are under a broader group called Arthropods. About 80% of all animals fall under the Arthropod group.
Insects
Yes, it has hundreds of billions of different kinds, including the same species.
An arthropod is a member of the phylum Arthropoda, which includes invertebrate animals such as insects, arachnids, crustaceans, and myriapods. Characterized by their segmented bodies, exoskeletons made of chitin, and jointed appendages, arthropods are the largest and most diverse group of animals on Earth. They can be found in nearly every habitat and play crucial roles in ecosystems, including pollination, decomposition, and serving as food for other animals.
If the Cretaceous mass extinction had not occurred, reptiles would today be the largest land animal in the world. At the time, reptiles were the largest animal group on Earth.
Insects.
No, a frog is not an arthropod. Frogs are amphibians, while arthropods are a group of invertebrates that includes insects, spiders, and crustaceans. Frogs have a backbone and belong to the class Amphibia.
No.
chilopoda
The arthropod group containing crabs is known as crustaceans. This is a very large group of this phylum and contains so many species.