Amazing Arthropods!

Kate Salsky Pre-Ap Biology March th, 2014 - VU

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Objectives:

By observing different arthropods such as crayfish and grasshoppers, students will be educated about the external and internal anatomies of these arthropods. Students will also observe the organs, structures, and main functions of an arthropod's respiratory system.

Crayfish Background Information:

Scientific name: Astacoidea


Taxonomy:

Kingdom: Animalia

Phylum: Arthropoda

Subphylum: Crustacea

Class: Malacostraca

Order: Decapoda


Habitat: Crayfish can be found in most aquatic and semi-aquatic environments throughout the United States and Canada.Crayfish can be found in about any body of water that isn't contaminated with pollution.


Predators: muskrats, raccoons, owls, hawks, snakes, turtles

Prey: frogs/toads, flies, algae, worms


Adaptations: One major adaptation that crayfish have is their eyes that are on short stems that move around, allowing them to see in all directions. They also have two pairs of antennae that help detect movement in the water. Another adaptation that crayfish possess are their shell color. Crayfish colors range from brown, to yellow, to green, reflecting the main colors of their habitats.

Grasshopper Background Information:

Scientific name: Caelifera


Taxonomy:

Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta

Order: Orthoptera


Habitat: Grasshoppers are found on all continents except Antarctica. They are found all over, and are classified as terrestrial.


Predators: ants, beetles, wasps, frogs, toads, lizards, snakes, birds.

Prey: Grasshoppers are herbivores, so they only eat plants. They mostly eat leaves, but also flowers, stems and seeds during a leave shortage.


Adaptations: One of the grasshopper's most significant adaptations are its strong hind legs. Grasshoppers are able to flex the muscles in their hind legs without moving them. This enables it to attain much higher stress levels in the muscle, giving it more potential energy. By releasing all this energy at once the grasshopper can generate an explosive catapult-like force that can launch it great distances.

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Crayfish Respiratory System

A main factor of the respiratory system of a crayfish, is the fact that is has the advantage to be able to breathe underwater due to their gills. The crayfish's gills are located on the outside of the body between the body wall and carapace. These gills are attached to the walking legs, so when the crayfish walks the gills spread out, allowing oxygen to be able to enter.

Grasshopper Respiratory System

A grasshopper's respiratory system mainly happens through the tracheal system. At first, air is taken into the spiracles, which are the dots on the body of the grasshopper in the abdominal and thoracic areas where air enters, and then later circulated throughout the body by the tracheae and the tracheal system. Then, the air goes to the air sacs, which act as temporary storage, keeping excess carbon dioxide and oxygen stored when the respiration is taking place.
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