Animal Diversity II

Question 1

Phylum Nematoda:

Answer 1

unsegmented, free-living and parasitic (Ascaris and Trichinella), complete digestive tract (mouth and anus), bilateral, 3 germ layers, tube body plan, and pseudocoelomate, no apparent external features

Question 2

Phylum Arthropoda:

Answer 2

segmented body, jointed appendages, chitinous exoskeleton, bilateral, all 3 germ layers, tube body plan, and coelomate, 3 classes (Arachnida, Crustacea, and Insecta)

Question 3

Phylum Echinodermata:

Answer 3

all marine, many of them have spines, radial and bilateral symmetry (pentamorous), water and vascular system for locomotion (enters body through madreporite; tube feet)

Question 4

What are the four basic features of the Phylum Chordata:

Answer 4

dorsal hollow nerve cord, notochord, pharyngeal gill slits, and postanal tail

Question 5

Subphyla Urochordata:

Answer 5

tunicates (sea squirts) and invertebrate

Question 6

Subphyla Cephalochordata:

Answer 6

amphioxus (lancelet), marine (usually buried in sand), all four features present as adult, and invertebrate

Question 7

What are the three subpyhla of Phyla Chordata?

Answer 7

Subphyla Urochodata, Subphyla Cephalochordata, and Subphyla Vertebrata

Question 8

Subphyla Vertebrata:

Answer 8

as adults the notochord is replaced by cartilaginous or bony columns (vertebrates)

Question 9

What are the seven classes of Subphyla Vertebrata?

Answer 9

class Agnatha, class Chondrichthyes, class Osteichthyes, class Amphibia, class Reptilia, class Aves, class Mammalia