Rays Biology of Sharks Exam 1 Questions & Answers 2024/2025
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Rays Biology of Sharks
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Rays Biology Of Sharks
Rays Biology of Sharks Exam 1 Questions & Answers 2024/2025
What are Elasmobranchs & how many gill openings do they have? - ANSWERS-Sharks & Rays (Batoids)
-Have 5-7 gill openings
About how long ago did vertebrates descend from small ocean fish? - ANSWERS~ 500 million years ago (mya) [Camb...
Rays Biology of Sharks Exam 1
Questions & Answers 2024/2025
What are Elasmobranchs & how many gill openings do they have? - ANSWERS-Sharks & Rays (Batoids)
-Have 5-7 gill openings
About how long ago did vertebrates descend from small ocean fish? - ANSWERS~ 500 million years ago
(mya) [Cambrian Period]
What are Chondrichthyes? - ANSWERSCartilaginous skeleton fish
How long ago did fish start to diversify? - ANSWERS~450 mya (Paleozoic era)
About how many species of sharks are there? - ANSWERS~500 species extant
About how many species of skates are rays (Betaidea) are there? - ANSWERS~600 species extant
What does Depressed mean? - ANSWERSSquished top -> bottom
Usually bottom dwellers
What does Compressed mean? - ANSWERSForm (body) squished side -> side
What factors do Holocephali (rat fish, rabbit, chimeras) have? - ANSWERS-Tail like a rat
-Teeth like a rabbit
-Upper jaw fused to upper casing of the cranium
-Eat crunchy things
-4 gill slits
-Head claspers on the males (dick on head)
, -Swim w/ pectoral fins (like a bird)
How can you tell the difference between a shark and a ray? - ANSWERSBy where the gill slits are located.
-Sharks: on the side of the head
-Rays: underneath the head
What's the difference between rays and skates? - ANSWERS-Rays: have dorsal fins
-Skates: have crura (walking appendages)
What is the name and characteristics of what is believed to be the earliest shark? - ANSWERSCladodont
shark: (extinct)
-5 gill slits
-Terminal mouth
-Cladodont teeth (long shark tooth with smaller teeth around the bottom)
What is the scientific name for true sharks and their characteristics? - ANSWERSEuselachi: (extinct)
-Have 2 deeply embedded fin spines
What is a cloaca? - ANSWERSThe opening where everything is dumped out and filtered "like a sewer"
What are the characteristics of Neoselachi (new shark; extant)? - ANSWERS-Subterminal mouth
-Protrusible jaw
-Calcified vertebrae
What type of sharks are apart of the superorder Galemorphii and what are some examples of each? -
ANSWERSCarcharhiniformes (ground sharks):
-Cat sharks
-Hound sharks
-Raquiem sharks
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