Exam 4 Zoology ACTUAL UPDATED Questions and CORRECT Answers
Terms in this set (81)
What is the origin of "Chordata"? "notochord," a flexible rod-like structure.
What are the five characteristics of chordates? (needs to -Notochord
appear during lifetime)
-Dorsal hollow nerve cord
-Pharyngeal slits
-Post-anal tail
-Endostyle or thyroid gland
What does the notochord become? The vertebral column (backbone).
What does the dorsal nerve cord become? The central nervous system (brain + spinal cord).
What do pharyngeal slits become? Fish: Gills
Mammals: Jaw and ear structures
What does the post-anal tail become in humans? It becomes the tailbone. (tail in other animals)
What does the endostyle become? thyroid gland
What are the three subphyla of chordates? -Vertebrata
-Cephalochordata (lancelets)
-Urochordata (tunicates)
Oldest subphyla Cephalochordata and Urochordata (protochordates)
Distinction of a Vertebrata? They have a vertebral column (backbone).
What is Agnatha? Jawless vertebrates (e.g., hagfish, lampreys).
What is Gnathostomata? Jawed vertebrates
, What is Pisces? Aquatic vertebrates, typically with gills and fins.
What is Tetrapoda? Four-limbed vertebrates adapted for land.
What is Anamniota? Vertebrates that lay eggs in water (e.g., amphibians, some fish).
What is Amniota? Vertebrates with eggs that have an amniotic sac, adapted to land (e.g., reptiles,
birds, mammals).
How are Cephalochordates different from Urochordates? Cephalochordates: Retain chordate traits throughout life. (fish-like, burrowing)
Urochordates: Retain chordate traits only in the larval stage. (sessile adults)
Oldest group within vertebrata fish
What are general fish characteristics? Aquatic, gills, fins, scales, ectothermic (cold-blooded).
Myxini hagfishes
petromyzontida lampreys
Chondrichthyes sharks and rays
Osteichthyes bony fish
What makes Myxini unique? They are jawless and slime-producing. (no vertebrae)
Terms in this set (81)
What is the origin of "Chordata"? "notochord," a flexible rod-like structure.
What are the five characteristics of chordates? (needs to -Notochord
appear during lifetime)
-Dorsal hollow nerve cord
-Pharyngeal slits
-Post-anal tail
-Endostyle or thyroid gland
What does the notochord become? The vertebral column (backbone).
What does the dorsal nerve cord become? The central nervous system (brain + spinal cord).
What do pharyngeal slits become? Fish: Gills
Mammals: Jaw and ear structures
What does the post-anal tail become in humans? It becomes the tailbone. (tail in other animals)
What does the endostyle become? thyroid gland
What are the three subphyla of chordates? -Vertebrata
-Cephalochordata (lancelets)
-Urochordata (tunicates)
Oldest subphyla Cephalochordata and Urochordata (protochordates)
Distinction of a Vertebrata? They have a vertebral column (backbone).
What is Agnatha? Jawless vertebrates (e.g., hagfish, lampreys).
What is Gnathostomata? Jawed vertebrates
, What is Pisces? Aquatic vertebrates, typically with gills and fins.
What is Tetrapoda? Four-limbed vertebrates adapted for land.
What is Anamniota? Vertebrates that lay eggs in water (e.g., amphibians, some fish).
What is Amniota? Vertebrates with eggs that have an amniotic sac, adapted to land (e.g., reptiles,
birds, mammals).
How are Cephalochordates different from Urochordates? Cephalochordates: Retain chordate traits throughout life. (fish-like, burrowing)
Urochordates: Retain chordate traits only in the larval stage. (sessile adults)
Oldest group within vertebrata fish
What are general fish characteristics? Aquatic, gills, fins, scales, ectothermic (cold-blooded).
Myxini hagfishes
petromyzontida lampreys
Chondrichthyes sharks and rays
Osteichthyes bony fish
What makes Myxini unique? They are jawless and slime-producing. (no vertebrae)
