Essay about chordates and vertebrates lab

2287 Words Jan 14th, 2015 10 Pages
Chordates and Vertebrates Lab
Introduction/Background:

In this lab students are learning all about chordates and vertebrates and will be viewing examples of them as well. The examples to be viewed in the lab are Tunicates, Lancelets, Lampreys, Rays, a Dogfish shark, a Perch, Catfish, Eels, Toads, Frogs, Lizards, Snakes, Roadrunner (foot), Barn owl (wing), Cotton tail rabbit , and an Opossum. The different types of chordates/vertebrates discussed in this lab are the urochordata, cephalochordate, craniates, gnathostomes, chondrichthyes, actinopterygii, tetrapods, amphibian, amniote, reptilian and aves, and mammals. Students are going to learn how to differentiate the different organisms and the characteristics that make them unique!
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Although both species are cold blooded, they are very different in appearance and physical makeup. Reptiles are covered in distinctive scales, and some may even have a rough texture. Amphibians, on the other hand, typically have smooth moist skin. Reptiles also have more diverse body types than amphibians. They may or may not have limbs, and can range in size from very small to substantially larger and heavier than humans. Most adult amphibians have four limbs, and while their size varies, very few grow larger than a man’s arm. The role of water is also an important distinguishing characteristic. Though many reptiles live in the vicinity of water, this is not essential for them to stay alive and some lizards and snakes are ideally suited to dry areas. By contrast, many amphibians must remain moist in order to breathe, although they do have lungs, they also take in oxygen through their skin. This thin skin means that they lost moisture easily as well, and some will even die if their skin dries completely. Life cycles are different in that when reptile eggs hatch, the young look like miniature adults. An amphibian initially emerges from an egg in the form of an aquatic larva, like a tadpole that breathes through gills until they mature and develop lungs so they may survive without being completely submerged.

3. Aves
a. Roadrunner

b. Barn Owl

4. Mammalia
a. Cottontail rabbit

b. Opossum

c. Which of

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