vertebrate characteristics & superclass agnatha Flashcards
(6 cards)
1
Q
what are the 2 main characteristics of vertebrates?
A
2 or more sets of hox genes and the development of the skull and backbone
2
Q
what distinct characteristic to organisms in superclass agnatha contain?
A
lack of jaw
3
Q
what classes are present in this superclass?
A
class myxini and petromyzontida
4
Q
what organism is in the class myxini and what are their characteristics?
A
hagfish, no jaw, backbone, or notochord, secretes slime to repel predators
5
Q
what organism is in the class petromyzontida and how do they consume their nutrients?
A
lampreys, ectoparasites that use their mouth to tear into the host and consume blood/tissue
6
Q
how did bones/teeth arise in vertebrates?
A
bony skeletons were a later development, mineralization likely began in the mouth
