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Colin Green, Tyler Simowitz

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1 Colin Green, Tyler Simowitz
Chordata (Fish) Myxini(Hagfish) Cephalaspidomorphi(Lampreys) Chondrichthyes(Sharks, Rays) Actinopterygii(ray-finned fish) Actinistia(Coelacanths) Dipnoi(Lungfish) Colin Green, Tyler Simowitz Tyler

2 What is a fish? What we call “fish” only apply to one clade of vertebrates - the Actinopterygians, which we will discuss later However, for all of our sakes, we will refer to all of the following as “fish” Colin, Tyler

3 Chordata colin

4 Hagish (Myxini) colin

5 Lamprey(Ceohalaspidomorphi)

6 Ray-Finned(Actinopterygii)

7 Shark(Chondrichthyes)

8 Lungfish(Dipnoi) Tyler

9 Body Cavity Myxini: coelom Cephalaspidomorphi: coelom, vertebrae
Chondrichthyes: coelom, vertebrae, jaw Actinopterygii: coelom, vertebrae, jaw Actinistia: coelom, vertebrae, jaw Dipnoi: coelom, vertebrae, jaw Colin, Tyler

10 Body Symmetry Myxini: symmetrical Cephalaspidomorphi: symmetrical
Chondrichthyes: symmetrical Actinopterygii: symmetrical Actinistia: symmetrical Dipnoi: symmetrical Colin, Tyler

11 Nervous System Myxini: yes, 2 brains
Cephalaspidomorphi: dorsal nerve, true nervous system Chondrichthyes: yes Actinopterygii: yes Actinistia: yes Dipnoi: yes Colin, Tyler

12 Circulatory System Myxini: present, 4 hearts
Cephalaspidomorphi: present Chondrichthyes: present Actinopterygii: present Actinistia: present Dipnoi: seperation of pulmonary Colin, Tyler

13 Digestive System Myxini: slow metabolism, can go 7 months without food
Cephalaspidomorphi: parasite, sucks blood, rows of teeth Chondrichthyes: spiral valve, prolongs passage of food, stomach Actinopterygii: stomach, intestines Actinistia: stomach, intestines Dipnoi: stomach, intestines Colin, Tyler

14 Excretory System Myxini: mouth, anus Cephalaspidomorphi: mouth, anus
Chondrichthyes: mouth, anus, bladder Actinopterygii: mouth, anus, large amounts of dilute urine, controls salt:water balance Actinistia: mouth, anus, dilute urine Dipnoi: mouth, anus, urine Colin, Tyler

15 Locomotion/Musculature
Myxini: paddle like tail, sluggish Cephalaspidomorphi: tail to propel Chondrichthyes: power movement of trunk and caudal(tail), propel forward, dorsal fins - stability, paired pectoral (fore) and pelvic (hind) help float Actinopterygii: fins for maneuvering and defense Actinistia: fins Dipnoi: tail and pectoral-pelvic fins Colin, Tyler

16 Skeletal Structure Myxini: skull contains cartilage
Cephalaspidomorphi: cartilage skeleton Chondrichthyes: cartilage, mineralized skeleton Actinopterygii: bony Actinistia: bony Dipnoi: bony, skull Colin, Tyler

17 Sensory Structures Myxini:eyes, ears, naval openings, one norstril
Cephalaspidomorphi: large eyes, one nostril Chondrichthyes: sharp vision, nostrils, detect electric fields Actinopterygii: eyes, nostrils Actinistia: eyes, nostrils Dipnoi: eyes, nostrils Colin, Tyler

18 Reproduction Myxini: lay eggs, no larvae stages, some hermaphrodites. Not well known Cephalaspidomorphi: egg-larvae-metamorphus-adult Chondrichthyes: eggs fertilized internally, pelvic fins-transfer sperm. Oviparous - newborn hatches outside of body, Ovoviviparous- internally Actinopterygii: eggs fertalized/born outside Actinistia:give birth to live young Dipnoi: external, dig hole in mud to protect Colin, Tyler

19 Gas Exchange Myxini: one gill Cephalaspidomorphi: 7 gills
Chondrichthyes: uses gills Actinopterygii: gills Actinistia:gills Dipnoi:gills and lungs Colin, Tyler

20 Unique Features Myxini: creates slime for protection
Ceohalaspidomorophi: attack humans only when they are starving Chondrichthyes: more dense than water makes them sink if they stop swimming Actinopterygii: includes 96% of all fish species Actinistia: Still alive, 2 species have been found Dipnoi: In dry periods, they burrow into the mud and go into a fish hibernation Colin, Tyler

21 Quiz 1. Which was the first “bony” fish? A)Dipnoi B)actinopterygii
C)Chondrichthyes D)Ceohalaspidomorphi Colin, Tyler

22 B is the correct answer

23 2. Which of the following has two brains? A) Myxini B)Actinistia
C)Ceohalaspidomorphi D)Dipnoi E)Chondrichthyes Colin, Tyler

24 The correct answer is A, Myxini have two brains and four hearts

25 3. What is the fin called that propels a shark forward A)Pectoral
B)Pelvic C)Caudal D)Dorsal Colin, Tyler

26 Correct answer is C

27 4. What do lampreys have that Myxini don’t A)Nostrils B)Bones C)Eyes
D)Vertebrae Colin, Tyler

28 Correct answer is D

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