Animals 2 Earthworm/Crayfish/Grasshopper

What clade of bilateral organisms does the earthworm belong to?

Lophotrochozoa.

What is the phylum and scientific name of the earthworm?

Phylum Annelida; Lumbricus terrestris.

What does Annelida mean?

"Little rings," referring to segmented body structure.

Are earthworms protostomes or deuterostomes?

Protostomes.

How do you distinguish dorsal vs ventral in an earthworm?

Ventral side is lighter; dorsal side has a dark blood vessel; ventral side has setae.

Where is the clitellum and what does it do?

Near the anterior end; forms an egg capsule (cocoon).

What type of circulatory and digestive systems do earthworms have?

Closed circulatory system and complete digestive system.

What is the digestive pathway in an earthworm?

Mouth → Pharynx → Esophagus → Crop → Gizzard → Intestine → Anus.

What stores food in an earthworm?

Crop.

Where is the earthworm nerve cord located?

Ventral side (ventral nerve cord).

What are the excretory organs of earthworms?

Nephridia.

What clade do crayfish and grasshoppers belong to?

Ecdysozoa.

What defines organisms in Ecdysozoa?

They molt an exoskeleton (ecdysis).

What are the three body regions of a crayfish?

Head, thorax, abdomen.

What is the genus of crayfish?

Cambarus.

What are appendages on the crayfish abdomen called?

Swimmerets.

What type of skeleton do crayfish have?

Jointed exoskeleton made of chitin.

What type of body cavity and circulatory system do crayfish have?

Coelomate with an open circulatory system.

Do crayfish have arteries and veins?

Arteries but no veins.

What are crayfish excretory organs and function?

Green glands; remove wastes and excess water.

What is the phylum, class, and genus of grasshopper?

Arthropoda, Insecta, Romalea.

What type of symmetry do grasshoppers have?

Bilateral symmetry.

Where are wings and legs attached in a grasshopper?

Thorax.

What is the grasshopper’s true coelom called?

Hemocoel.

What are spiracles and where are they located?

Respiratory openings on abdomen and thorax.

What is the function of the tympanum?

Hearing (eardrum).

What organ stores food in a grasshopper?

Crop.

What is the excretory system of a grasshopper?

Malpighian tubules.