| Differences | ||
| Grasshopper (Arthropod- Insect) | Lobster (Arthropod- Crustacean) | Spider (Arthropod- Arachnid) |
| -3 body segments: head, thorax, & abdomen. -2 large jumping legs & 4 walking legs. 6 legs total. -Pair of wings attached at the thorax. -Mandibles (jaws) are used for chewing. -2 sets of eyes: 1 pair of large compound eyes under the antennae and 3 ocelli, which detect light & dark, in between the compound eyes. -Sensory organ: Antennae. Used to touch and smell. | -2 body segments- Cephalothorax and abdomen. -10 walking legs; the front 3 pairs bear claws. -Largest of the 3 clawed legs are the chelipeds. -Cheplipeds = Prey-capturing body part. -2 simple eyes. -Small, leg-like structures called swimmerets are located under the abdomen. -Swimmerets used to move, hold eggs/young, and transfer sperm. -Sensory organ: Antennae. | -2 body segments- Cephalothorax (head+thorax) and abdomen. -8-legged invertebrate. -8 ocelli eyes. No compound eyes. -Body segments are connected by the pedicel, the spider’s waist. -Sensory organ: Pedipalps. They resemble short legs at the front of the spider. -Jaws are called chelicera, with poison-injecting fangs. -Jaws = Prey-capturing body part. |
| Similarities | ||
| -Hard exoskeleton made of chitin. -Segmented bodies (3 segments for insects, 3 for crustaceans and spiders). -Have 3 kinds of appendages: mouthparts, sensory organ, and legs. -Bilaterally symmetrical. | ||
Grasshopper
Image from: http://www.enchantedlearning.com/ggifs/Grasshopper_bw.GIF
Lobster
Image from: http://www.gma.org/lobsters/images/lobsterbottomview.gif
Spider
Image from: http://www.bumblebee.org/invertebrates/images/spider.gif
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