LAB 10: Phylum Chordata

• Identify one group (class) in lab 10 that is characterized by having seven (7) pairs of gill slits.

  Lamprey
• Identify one group (class) in lab 10 that is characterized by having no notochord in the adult.

  Ray-finned fish
• Give one characteristic of the class Actinopterygii (ray-finned fish) from lab 10.

  Small cerebrum
• Give one characteristic of the class Squamata (snakes and lizards) from lab 10.

  Oviparous
• In which group (class) should you classify chordate with the following characteristics: 2-chambered heart, 5 pairs of gill slits, swim bladder, scales?

  Ray-finned fish
• How many chambers are there in the heart of lizards and snakes?

  3 1/2
• Oviparous: mother lays eggs, young develop with nutrition in eggs
• Viviparous: young receive nutrition as they develop inside mother, live birth
• Ovoviviparous: eggs retained inside parent, young develop with nutrition in eggs, live birth
• Poikilotherm: body temperature generally the same as that of the environment
• Homeotherm: body temperature generally different from that of the environment
• Lateral: to the sides of the animal
• Dorsal: to the back of the animal
• Ventral: to the belly of the animal
• Anterior: to the head end of the animal
• Posterior: at the tail of the animal
• Cloaca: common opening for digestive, excretory, and reproductive systems