How arthropods classified by antennae?

Answer 1

Almost all arthropods have antennae, like the insects, crustaceans, millipedes, etc. The chelicerates (including arachnids like scorpions and Spiders) have none, and they are also absent from a subgroup of hexapods (which contains the insects) called proturans.

Answer 2

Arthropods have antennae to perform sensory functions; humidity, touch, the chemical sense of taste and smell, and sometimes other functions. In some ants, they are used to communicate.

For some senses, having paired antenna enables a differential comparison of neuronal signalling characteristics, such that arthropods can also establish a direction for the source of the stimulus, similar to the technique as a human brain would use with a pair of eyes to triangulate a target.

Answer 3

All arthropods except chelicerates and proturans have antennae. The chelicerates include arachnids, horseshoe crabs, and sea spiders. Crustaceans are said to have two pairs, with biramous or branching antennae, the smaller pair called antennules. On those arthropods with no antennae, often other body parts will perform sensory functions, for example the forward pairs of appendages on spiders.

Answer 4

The segmentation provides at least a limited form of flexibility. Consider the engineering problem of having a hard exoskeleton. If there were no processes functioning as joints you would be entirely rigid, have no mobility, no way to move food to your mouth, etc. Arthropoda overcome this by having joint appendages. The body segmentation is another manifestation of this compromise; the exterior armor remains rigid yet still provides some flexibility that enables you to curl into a defensive ball (like the woodlice), to hide in a crag or use the powerful tail muscle for movement (like a lobster or crayfish), to crawl under and around objects on an uneven surface (like a millipede), etc.

Answer 5

Antennae on arthropods perform sensory functions. In insects they detect moisture, temperature, and have olfactory functions; in crustaceans there are chemical receptors which function similar to our taste and smell for molecules drifting in seawater. There are also sensory receptors in many arthropod antennae which detect the amount of force from muscle action and the degree of bending and thus provide the touch sense. Some butterflies have a solar compass in their antennae, used for navigation.

Answer 6

Antennae on arthropods perform sensory functions. In insects they detect moisture, temperature, and olfactory functions; in crustaceans there are chemical receptors which function similar to our taste and smell for molecules drifting in seawater. There are also sensory receptors in many arthropod antennae which detect the amount of force from muscle action and the degree of bending and thus provide the touch sense. Some butterflies have a solar compass in their antennae, used for navigation.