CK12 Life Science

Chapter 13 Fishes, Amphibians, and Reptiles 13.1 Lesson 13.1: Introduction to Vertebrates Lesson Objectives Describe the genera ...

istics. About 58,000 species have been described and contain many familiar groups of large land animals. Chordates Chordates (ph ...

Figure 13.2: Pikaia gracilens(subphylum cephalochordates), perhaps the oldest known an- cestor of modern vertebrates, resembled ...

Figure 13.3: A species of carp, carp bream (Abramis brama). ( 10 ) Figure 13.4: An image of the blue whale, the largest living v ...

Classification of Vertebrates Vertebrates consist of both jawless and jawed vertebrates. The jawless vertebrates consist of more ...

Further Reading / Supplemental Links http://www.ucmp.berkeley.edu/chordata/Chordata.html http://www.ucmp.berkeley.edu/vertebrat ...

13.2 Lesson 13.2: Fishes Lesson Objectives List the general traits of fish. Describe the features of jawless fish. List the gen ...

Jaws Two sets of paired fins Several unpaired fins Streamlined body Gills or an accessory breathing organ Lays eggs that are fe ...

Figure 13.6: One of the cartilaginous fish, a stingray, showing very flexible pectoral fins connected to the head. ( 21 ) Figure ...

In addition to the absence of jaws, Agnatha are characterized by absence of paired fins, the presence of a notochord both in lar ...

and skates, and the other containing the sharks (Figure13.9). There are eight orders of sharks within the superorder. They are d ...

Figure 13.10: One of the only eight living species of lobe finned fish, the lungfish. ( 30 ) Figure 13.11: One of the eight livi ...

bony-fish belong to the Actinopterygii; there are only eight living species of lobe finned fish, including the lungfish (Figure1 ...

Why Fish are Important Now that you have some understanding of the general features of fish, you might come up with some ways in ...

Figure 13.14: Fish play an important role in many cultures, including art, through the ages. Here is a still life of fish, eels, ...

List some ways that fish are important. Further Reading / Supplemental Links Unabridged Dictionary, Second Edition. Random Ho ...

Points to Consider Juvenile bichirs, a type of fish, have external gills, a very primitive feature that they hold in common wit ...

Characteristics of Amphibian Amphibians are ectothermic vertebrates, belonging to the class Amphibia and consist of three orders ...

Figure 13.15: The marbled salamander,Ambystoma opacum, shows the typical salamander body plan: slender body, short legs, long ta ...

ability to regenerate lost limbs, as well as other body parts, in a process known asecdysis. Salamanders are found in most moist ...