Arthropoda - Encyclopedia.com
2018年5月23日 · 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.
Centipedes - Encyclopedia.com
2018年5月9日 · Centipedes (phylum Arthropoda, class Chilopoda) occur throughout the world in both temperate and tropical regions, living in soil and humus and beneath fallen logs, bark, and stones. Because they lack a hard outer skeleton, centipedes are confined to moist environments in order to maintain their water balance.
Arthropods: Insects, Arachnids, and Crustaceans
ARTHROPODS: INSECTS, ARACHNIDS, AND CRUSTACEANS ARTHROPODS: INSECTS, ARACHNIDS, AND CRUSTACEANS. Arthropods are animals with exoskeletons (external skeletons ...
Arachnids - Encyclopedia.com
2018年6月8日 · 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 ...
Trilobite - Encyclopedia.com
Trilobita (trilobites; phylum Arthropoda) The most primitive arthropod class, 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 extinct in the Permian .
Merostomata (Horseshoe Crabs) - Encyclopedia.com
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
Arthropod-borne Disease - Encyclopedia.com
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 that usually act as vectors for various pathogens (disease-causing microorganisms), including bacteria, viruses, helminths ...
Malacostracans - Encyclopedia.com
2018年5月21日 · 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.
Copepods - Encyclopedia.com
Copepoda (phylum Arthropoda, sub-phylum Crustacea) Large and diverse class of mostly marine crustaceans, though there are many freshwater species and a few which live in water films between mosses and soil particles. Many are ectoparasites of fish and whales.
Chelicerata - Encyclopedia.com
2018年6月27日 · Chelicerata (kəlĬs´ərät´ə), subphylum of Arthropoda [1], including the horseshoe crabs (order Xiphosura), the arachnids (class Arachnida), and the sea spiders (class Pycnogonida). The extinct giant water scorpions (order Eurypterida, not …