Arthropod | Definition, Examples, Characteristics, Classes, Groups ...
2024年10月25日 · Arthropod, any member of the phylum Arthropoda, the largest phylum in the animal kingdom, which includes such familiar forms as lobsters, crabs, spiders, mites, insects, centipedes, and millipedes. About 84 percent of all known species of …
Arthropod structure and classification | Britannica
arthropod, Any member of the largest phylum, Arthropoda, in the animal kingdom. Arthropoda consists of more than one million known invertebrate species in four subphyla: Uniramia (five classes, including insects), Chelicerata (three classes, including arachnids and horseshoe crabs), Crustacea (crustaceans), and Trilobita (trilobites). All ...
Arthropod - Exoskeleton, Segmented, Jointed | Britannica
2024年10月25日 · Minute crustaceans inhabit underground waters in many parts of the world, and deserts support a large arthropod fauna, especially insects and arachnids. Arthropods are the only invertebrates capable of flight.
Arthropod - Insects, Crustaceans, Arachnids | Britannica
2024年10月25日 · Arthropod - Insects, Crustaceans, Arachnids: Arthropod classes are based on criteria such as modification, specialization, number, and appearance of body segments and appendages. Their relationships both within the phylum and with other animal phyla are uncertain.
arthropod - Students | Britannica Kids | Homework Help
Arthropods are animals that have a hard outer shell called an exoskeleton that supports and protects the animal’s soft body. Arthropods are scientifically classified as members of the phylum Arthropoda, the largest phylum in the animal kingdom.
arthropod - Kids | Britannica Kids | Homework Help
Arthropods are animals that have a hard outside covering called an exoskeleton. Insects, crustaceans, and arachnids are three of the largest arthropod groups. Arachnids include spiders and mites.
Arthropod - Molting, Reproduction, Adaptations | Britannica
2024年10月25日 · Arthropod - Molting, Reproduction, Adaptations: With few exceptions, the sexes are separate in arthropods. The paired sex organs, or gonads, are connected directly to ducts that open onto the ventral surface of the trunk.
Arthropod - Muscles, Appendages, Locomotion | Britannica
2024年10月25日 · Arthropod - Muscles, Appendages, Locomotion: Arthropods are unusual among invertebrates; they lack locomotory cilia, even as larvae. Most arthropods move using their segmental appendages, the exoskeleton, and muscles.
Arthropods Portal | Britannica
Arthropoda is the largest phylum in the animal kingdom; about 84 percent of all known species of animals fall into this category. Lobsters, crabs, spiders, mites, insects, centipedes, and millipedes are all arthropods.
Cambrian period, Extinction, Arthropod, & Facts - Britannica
2024年11月13日 · trilobite, any member of a group of extinct fossil arthropods easily recognized by their distinctive three-lobed, three-segmented form. Trilobites, exclusively marine animals, first appeared at 521 million years ago near the beginning of the Cambrian Period (538.8 million to 485.4 million years ago), when they dominated the seas.