BIOL 111 Lecture Notes - Lecture 47: Gill Slit, Yolk Sac, Swim Bladder

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23 Jul 2016
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BIOL 111 Organismal Biology
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!!they will attach themselves to another fish or animal and suck out its
blood, flesh and juices
o!they have 7 gill slits and 6 gill arches
Chondrichthyans
!EVOLUTIONARY INNOVATION: the development of the jaw
o!formed by the fusion of the first few gill arches
o!can be made of either cartilage or bone
o!teeth have formed in the jaw by oral scales
o!jaws have greatly improved feeding and diversity
!they are mostly marine
!include sharks, skate and rays
!they have jaws and paired fins
!they have 5-7 gill slit pairs
!they have scales
!they do not have a swim bladder
o!instead they have an oily bladder
!they can be either predators, scavengers or filter feeders
!they fertilize internally
!males have special copulatory organs on the pelvic fins called claspers
!they can be oviparous, ovoviviparous, or viviparous
!in oviparous fishes:
o!female lays eggs
o!young feeds off of yolk sac outside the body
o!it can be either internal or external fertilization
!in ovoviviparous fishes:
o!female retains eggs
o!young feeds off of yolk sac inside the body
o!internal fertilization
!in viviparous fishes:
o!female retains eggs
o!young receives nutrients from mother through placenta
o!internal fertilization
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