Arthropods Flashcards
Myriapods
Arthropods with a head and trunk. The head has one pair of antennae and simple eyes. Trunk segments have one pair of legs, but may be fused into double segments.
Chelicerates
Arthropods with bodies divided into 2 main sections. They have no antennae, and the 1st pair of limbs takes the form of pincerlike mouthparts (chelicerae).
Arachnids
Mainly terrestrial chelicerates with pairs of simple eyes. Food is typically liquified outside the body, and they breathe through book lungs or tracheae, or both.
Crustaceans
Arthropods with 3 body sections. Their heads have jaws, 2 pairs of antennae, and 1 pair of eyes. They have 2-branched limbs and, typically, gills to breathe.
Malacostracans
Includes the larger shrimp- and crab- like crustaceans. The thorax has an upper shell and 8 limb-bearing segments; the abdomen has 6 limb-bearing segments.
Eucaridans
Malacostracans with the upper shell fused to all segments of the thorax. The eyes are always stalked.
Decapods
Eucaridans that use the front 3 pairs of limbs for feeding the back 5 pairs for walking. 1 pair of walking legs may have pincers.
Hexapods
Arthropods with a fused thorax comprising 3 segments, each bearing a pair of legs. Their heads have 1 pair of antennae.
Insects
A huge group of hexapods with external mouthparts that are not so tainted inside a pouch that can be turned inside out.
Winged Insects
Insects that have wings in addition to legs. The 2nd and 3rd segments of the thorax typically each carry a pair of wings.
Neopterans
Winged insects in which special muscles and base joints allow the wings to be folded back along the body when not in use.
Holometabolans
Neopterans that develop with complete metamorphosis by means of a pupal stage. Larvae and adults are dissimilar and have different lifestyles.
Neuropterids
The least advanced group of holometabolans with net- or lack-like wing veining and a simple pupal stage.
What are the 4 main groups of Arthropods?
Chelicerates, Myriapods, Crustaceans, and Hexapods.
