ture 6 . September 8, 2008 ish Chondrichthyes SHARKS & RAYS a. reproduction b. notable shark & ray orders c. shark conservation Sarcopterygii vs. Actinopterygii Story of the coelacanth a. Coelacanth biology b. Lungfish biology
Dec 22, 2015
Lecture 6. September 8, 2008
Finish Chondrichthyes
1. SHARKS & RAYSa. reproductionb. notable shark & ray ordersc. shark conservation
2. Sarcopterygii vs. Actinopterygii
3. Story of the coelacantha. Coelacanth biologyb. Lungfish biology
Lemon Shark Giving Birth
• http://www.youtube.com/watch?v=LfQgRCg1bNA
whale shark video
• http://www.youtube.com/watch?v=uQrBwN39LJI
megamouth video
• http://www.youtube.com/watch?v=RxhqBmnZv8Q
• start at 2:10
thresher shark video
• http://www.youtube.com/watch?v=BQrrW9VRMFQ
• start at 5:30
great white shark video
• http://www.youtube.com/watch?v=O2FInaOCqoo
Order Carcharhiniformes (ground sharks)
• Family Carcharhinidae (requiem sharks) Largest Order - 8 families, 210 species
Tiger shark Hammerhead shark
Order Carcharhiniformes (ground sharks)
• Family Carcharhinidae (requiem sharks)
Bull shark
Oceanic white tip shark
Silky shark
Shark attacks on humans
• 35 to 55 unprovoked attacks each year
• 6 to 11 fatalities per year
• 54% of attacks on surfers/windsurfers 38% on swimmers/waders 6% on divers/snorkelers
Regions with most shark attacks:
Shark attacks on humans
• 35 to 55 unprovoked attacks each year
• 6 to 11 fatalities per year
• 54% of attacks on surfers/windsurfers 38% on swimmers/waders 6% on divers/snorkelers
Regions with most shark attacks:South Africa - 63 attacks from 1990 to 2003Brazil - 57 “ “ “ “Australia - 51
Shark attacks on humans
• 35 to 55 unprovoked attacks each year
• 6 to 11 fatalities per year
• 54% of attacks on surfers/windsurfers 38% on swimmers/waders 6% on divers/snorkelers
Regions with most shark attacks:South Africa - 63 attacks from 1990 to 2003Brazil - 57 “ “ “ “Australia - 51Florida - 311
dogfish sharks (Squalidae)
dogfish shark
http://www.flmnh.ufl.edu/fish/sharks/SpinyDogfish/spinydogfish.html
Weblinks:
great white : http://www.flmnh.ufl.edu/fish/sharks/whaleshark/whaleshark.html
megamouth: http://www.flmnh.ufl.edu/fish/Sharks/Megamouth/mega.htm
thresher: http://www.new-brunswick.net/new-brunswick/sharks/species/thresher.html
hammerhead: http://www.flmnh.ufl.edu/fish/Gallery/Descript/SmHammer/SmoothHammerhead.html
sawfish: http://www.flmnh.ufl.edu/fish/education/sawfishbrochure.pdf
manta ray: http://www.flmnh.ufl.edu/fish/gallery/Descript/MantaRay/MantaRay.html
for ground and requiem sharks (family Carcharinidae), skates (family Rajidae), and sting rays (Dasyatidae) go to the following website and look up some details about one or two species.
http://www.flmnh.ufl.edu/fish/Education/bioprofile.htm
There is tons of really cool stuff on sharks at the Florida Museum of Natural History website.
We could spend a lot of time on each of the various orders and families in the Elasmobranchii. Instead, I want you to look up something about each of the following groups. Find one or two facts that are of interest to you.
Class Sarcopterygii
• Three major living groups
• Coelacanthimorpha-coelacanths (two species)
• Dipnoi-lungfishes (six species)
• Tetrapoda (all non-fish vertebrates)
Order Coelacanthiformes
• Smith describes the coelacanth, Latimeria chalumnae, discovered in 1939, a true living fossil
Order Coelacanthiformes
• “New” populaiton discovered at Sulawesi, Indonesia 1997
• DNA analyses indicate divergence from L. chalumnae at 5.0-11.0 Ma
• Described as a new species L. menadoensis