May 23, 2018 · 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 ARTHROPODS: INSECTS, ARACHNIDS, AND CRUSTACEANS. Arthropods are animals with exoskeletons (external skeletons ...

Jun 8, 2018 · 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 ...

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 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 ...

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 .

May 9, 2018 · 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.

May 21, 2018 · 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.

May 21, 2018 · Cirripedia (barnacles; phylum Arthropoda, subphylum Crustacea) The only class of crustaceans, apart from parasitic groups, in which the adults are wholly sessile. Cirripedes are the familiar barnacles that settle on rocks, submerged timbers, corals, …

May 29, 2018 · cephalothorax In some members of the phylum Arthropoda, the fused head and thorax. It is found in members of the Chelicerata (classes Merostomata, Arachnida, and Pycnogonida), and in most Crustacea. In spiders, it is the prosoma, which is covered by a sclerotized plate (carapace), and which bears the walking limbs, pedipalps, chelicerae, and ...