Anatomy of an Arthropod

Anthropod lab Emily Myers-Pap-Bio-2

Astacoida and Caelifera

Crayfish – also called crawfish, crawdads, freshwater lobsters, or mudbugs – are freshwater crustaceans resembling small lobsters, to which they are related; taxonomically, they are members of the superfamilies Astacoidea and Parastacoidea. They breathe through feather-like gills and are found in bodies of water that do not freeze to the bottom. They are mostly found in brooks and streams where there is fresh water running, and which have shelter against predators. Most crayfish cannot tolerate polluted water, although some species such as the invasive Procambarus clarkii are hardier. Crayfish feed on living and dead animals and plants.


The grasshopper is an insect of the suborder Caelifera in the order Orthoptera. To distinguish it from bush crickets or katydids, it is sometimes referred to as the short-horned grasshopper. Species that change colour and behaviour at high population densities are called locusts.

Big image

Habitat of a crayfish

Rivers and brooks are the main living habitat for the crayfish due to their water clarity and thin ice conditions. Humans will rarely see crayfish during the day but if you shine a flashlight in the water at dark its a whole different story. These guys do their traveling and feeding during the darkest hours of the night. You will see them walking ever so slow to their destinations but when danger arises, the flap their strong tail and their gone in the blink of an eye.

Crayfish predators

The primary predators of crayfish young and eggs are other crayfish and fish. Most adult crayfish are preyed on by large fish, otters, raccoons, mink, and great blue herons. Northern clearwater crayfish, and other crayfish, escape from predators with a "tail-flip" response. This is a rapid flip of their tail segments which sends them quickly through the water in the opposite direction from where they detected the disturbance. The presence of other crayfish that have just been alarmed by a predator will make crayfish more likely to use the tail-flip response than otherwise.

Grasshopper habitat

Most grasshoppers prefer dry open habitats with lots of grass and other low plants, though some species live in forests or jungles. Many of the grassland species invade farmer's fields too.

Grasshopper predators

Grasshoppers jump or fly away, and then hide if they can. Some species eat toxic plants and keep the toxins in their bodies to discourage predators.

Known Predators:

ground beetles (eat eggs), wasps, ants, praying mantids, spiders (any kind that is big enough), mites (eat eggs, parasites on adults), centipedes, frogs, toads, lizards, snakes, birds, small mammals especially shrews.

Grasshopper Dissection