Arthropoda | Encyclopedia. com Arthropoda [1] The phylum Arthropoda is the largest and most varied in the animal kingdom It includes well over one million described species This represents approximately three-quarters of all known biological organisms, living or extinct
Arthropods: Insects, Arachnids, and Crustaceans - Encyclopedia. com ARTHROPODS: INSECTS, ARACHNIDS, AND CRUSTACEANS ARTHROPODS: INSECTS, ARACHNIDS, AND CRUSTACEANS Arthropods are animals with exoskeletons (external skeletons), segmented bodies, and jointed legs They are the largest group of animals on Earth and include insects, crustaceans, and arachnids Insects include organisms such as beetles, grasshoppers, and butterflies They are mostly terrestrial
Arachnids | Encyclopedia. com Arachnids Arachnids (class Arachnida) form the second largest group of terrestrial arthropods (phylum Arthropoda) with the class Insecta being the most numerous There are over 70,000 species of arachnids, which include such familiar creatures as scorpions, spiders, harvestmen or daddy longlegs, and ticks and mites , as well as the less common whip scorpions, pseudoscorpions, and sun spiders
Crustacean | Encyclopedia. com Crustacean The Crustacea are a subphylum of the animal phylum Arthropoda This is a large and diverse group with more than forty thousand species, including crabs, shrimp, lobsters, crayfish, barnacles, and many near-microscopic members of the zooplankton community
Malacostracans | Encyclopedia. com Malacostraca (phylum Arthropoda, subphylum Crustacea) One of eight classes of Crustacea, the malacostracans appear in the Cambrian There are usually eight pairs of biramous, thoracic limbs, some forms have pincer-like appendages, and the limbs may be modified for swimming, feeding, or other purposes
Merostomata (Horseshoe Crabs) - Encyclopedia. com Merostomata (Horseshoe crabs) Phylum Arthropoda Class Chelicerata Subclass Merostomata Number of families 1 Thumbnail description Marine creatures distinguished by a large, hard exoskeleton that includes an arched, horseshoe-shaped shield in front (prosoma), a middle portion (opisthosoma), and a thin tail (telson); they are among the oldest living organisms
Trilobite | Encyclopedia. com Trilobita (trilobites; phylum Arthropoda) The most primitive arthropod class (or in some classifications a phylum, where the Arthropoda rank as a superphylum), known from more than 3900 fossil species Inhabitants of Palaeozoic seas, the trilobites appeared first in the early Cambrian, had their widest distribution and greatest diversity in the Cambrian and Ordovician Periods, and became
Isopoda (Pillbugs, Slaters, and Woodlice) | Encyclopedia. com Isopoda (Pillbugs, slaters, and woodlice) Phylum Arthropoda Subphylum Crustacea Class Malacostraca Order Isopoda Number of families Approximately 120 Thumbnail description Small, generally gray, usually flat, marine, freshwater, or terrestrial animals with numerous legs; some species are parasitic
Copepoda (Copepods) - Encyclopedia. com Copepoda (Copepods) Phylum Arthropoda Subphylum Crustacea Class Maxillopoda Subclass Copepoda Number of families 220 Thumbnail description Copepods are characterized by a body plan that consists of five head segments, seven thoracic segments, and a limbless abdomen of four segments; body lengths range from 0 019–7 8 in (0 5 mm to 20 cm); occur virtually everywhere there is water
Arthropod-borne Disease - Encyclopedia. com Arthropod-borne Disease Introduction Disease History, Characteristics, and Transmission Scope and Distribution Treatment and Prevention Impacts and Issues BIBLIOGRAPHY Introduction Arthropod-borne diseases are transmitted by arthropods, members of the invertebrate phylum Arthropoda, which includes insects, spiders, and crustaceans Mosquitoes, fleas, ticks, lice, and flies are the arthropods