Wize University Biology Textbook > Craniates (Developed Heads)
Vertebrata (Vertebrates)
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Subphylum Vertebrata
Vertebrate Characteristics
- Vertebral Column: backbone
- Chain of skeletal elements surrounding and protecting fragile nerve chord
- Complex nervous system
- Replaces the notochord
- Increased rigidity
- Allows for attachment of skeletal muscles / other bones
Class Petromyzontida
- Lampreys
- Eyes lack lens
- No jaw or paired limbs
- Skeleton made of cartilage
- Notochord surrounded by cartilaginous tube
- Paired dorsal spines protect nerve chord
- Primitive vertebral column
- Parasites of fish
- Adults in lakes or ocean
- Clamp onto fish and rasp flesh
- Holds onto rocks when not feeding
Practice: Vertebrata
Which of the following are true about the vertebral column? (select all that apply)
Practice: Vertebrata
Which of the following are true about Petromyzontida (Lampreys)? (select all that apply)