Sharks: Dogfish (Squalus acanthius)
Class Chondrichthyes:_____________________
Shark skin
• Placoid scales/dermal denticles
•
As sharks grow, scales do not
Spiracles:
• Opening ______________________
• Fast swimming sharks: __________________________________
• Sedentary/bottom dwellers: ______________________________
Gill Slits: _____________________________
• Where gas exchange _____________
Shark Teeth
• Most _______________ jaws on the planet
• Both jaws move
• Sharks can grow and lose over ____________ teeth in their lifetimes!
• Different species =
• Polydont:
Lateral Line:
Made up of tiny pores that are sensitive to ___________________________________________
Smell
• Excellent! sharks can detect a concentration as low as ______ of some chemicals, amino acid!!
• Can detect smells up to _________________________________
• Water continually flows through their _____________________________
• Nostrils (____________) only used for __________, not __________________________
Ampullae of Lorenzini: patches of _____________________
• Sensitive to changes in ___________________________________________________________
Sharks: Dogfish (Squalus acanthius)
Muscles
• Myotomes/ myomeres:
•
Myosepta:
•
Flexor
•
Antagonistic muscles
*Extensor
Digestive System
Esophagus:
• connects the _______________ & _______________
• Extension of the___________
Liver
• Multi-lobed; stores______
o Jobs:
o Liver is up to _____ of body weight, ours is
_____
o Gall bladder
Intestine & spiral valve
o
o
Cloaca
• Means __________________
• Receives the products of the
Rectal Gland (not really digestive!!!) ________________________function
• Excretes ________________
Respiratory System
• Gill Raker
•
•
•
Gill Filament
Gill cartilage
Urogenital system (reproductive & excretory)
Females
• Do not have____________
• Ovaries are ________________
• Where are ovaries
• Age at maturity: ______
gestation_______
• Females are larger
Sharks: Dogfish (Squalus acanthius)
•
Development can be
1. viviparous
2. oviparous
3. ovoviviparous
Males
• Have ________
• Sperm is released through______________
• Age at maturity ___________
Kidneys:
Circulatory System
• What is the path blood flows in a shark?
Nervous System
Smell
Sight
Brain
Ear
•
•
Olfactory bulb/sac:
Olfactory lobe:
•
Optic lobe
•
•
Medulla oblongata:
Cerebellum
•
•
Shark’s ear is located in ____________
Semicircular canals:
•
•
•
Eyes on the _____________ of head in most sharks
Tapetum Lucidum: reflective _______________________
Some sharks have an eye covering (goes down to up)
called ____________________
Eye