Diversity of Fishes II
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Transcript of Diversity of Fishes II
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Diversity of Fishes II
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• Phylum Chordata– Superclass Agnatha
•Class Pteraspidomorphi †•Class Myxini (?)•Class Cephalaspidomorphi
– Superclass Gnathostomata•Class Placodermi †•Class Acanthodii †•Class Chondrychthyes •Class Sarcopterygii•Class Actinopterygii
Fish Taxa Diversity
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Superclass Gnathostomata• Class Placodermi †
– Bony anterior plates– Jawed with depressed flattened
bodies– Pectoral and pelvic fins
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Superclass Gnathostomata Class Chondrichthyes
• Subclass Elasmobranchii– Sharks, skates and rays– Cartilaginous skeleton, placoid scales,
replacement dentition, internal fertilization and multiple gill slits.
• Subclass Holocephali– Chimaeras or ratfishes– Upper jaws fused to braincase,
cartilaginous skeleton, single gill cover, separate anal and urogenital openings, erectable dorsal spine
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Subclass Elasmobranchii• Around 800 species of sharks and rays• Cartilaginous skeleton with calcifications• Teeth replaced serially• Soft un-segmented fins (ceratotrichia)• FIVE, six or seven external gill slits (spiracule)• Buoyant livers and spiral valve intestines• Internal fertilization (pelvic fin claspers)• Osmotic regulation through metabolic waste
products (urea and Trimethylamine oxide-TMAO)
• Single cloaca
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Subclass Elasmobranchii
• Predators (or scavengers)• Mainly marine habitats• Slow metabolism and slow growth• Internal fertilization• Low fecundity (few & large young)
– Ovipary– Ovovivipary– Vivipary
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Oophagy orCarnivorous ovovivipary
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• Subclass Elasmobranchii– Order Heterodontiformes (8 spp, bullhead and horn
sharks)• Family Heterodontidae• 2 dorsal fins each with a spine
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• Subclass Elasmobranchii– Order heterodontiformes (8 spp, bullhead and horn
sharks)• Family Heterodontidae• 2 dorsal fins each with a spine
– Order Orectolobiformes (31 spp, carpet sharks)• 7 families• 2 dorsal fins with no spines, short mouth• Includes wobbegons, nurse sharks and whale sharks
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• Subclass Elasmobranchii– Order heterodontiformes (8 spp, bullhead and horn
sharks)• Family Heterodontidae• 2 dorsal fins each with a spine
– Order Orectolobiformes (31 spp, carpet sharks)• 7 families• 2 dorsal fins with no spines, short mouth• Includes wobbegons, nurse sharks and whale sharks
– Order Carcharhiniformes (210 spp, ground and requiem sharks)
• 7 families• 2 dorsal fins with no spines, medium mouths• Includes cat sharks, gray sharks, tiger sharks, blue sharks,
hammerheads
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• Subclass Elasmobranchii (cont.)– Order Lamniformes (16 spp, mackerel sharks)
• 7 families• 2 dorsal fins with no spines, large mouths• Includes great white, mako, basking sharks, thresher sharks
and megamouth
– Order Hexanchiformes (5 spp, cow & frill sharks)• 2 families• One dorsal fin, six or seven gill slits
– Order Squaliformes (74 spp, dogfish sharks)• 4 families• 2 dorsal fins with or without spines, no anal fin• Includes dogfish and cookie-cutter sharks sharks
– Order Squatiniformes (12 spp, angel sharks)• 1 family• Ray-like body, terminal mouth
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• Subclass Elasmobranchii (cont.)– Order Pristiophoridae (5 spp, Sawsharks)
• Shark-like body, flat blade snout with lateral teeth of unequal size
– Order Rajiformes (456 spp, 13 families)• Ventral gill openings, dorsal eyes, depressed bodies,
advanced pectoral fins attached to the head
• Includes sawfishes, guitarfishes, electric rays, skates, stingrays, butterfly rays, eagle rays and Manta rays
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SharksOrders
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Rays & SkatesOrder Rajiformes
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Subclass Holocephali
• Chimaeras or ratfishes (58 spp.)– 3 Families– Upper jaws fused to braincase,
cartilaginous skeleton, single gill cover, separate anal and urogenital openings, erectable dorsal spine (poisonous)
– Breath through nostrils– Male have clasper on head (internal
fertilization).
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1580-2005 Map of World's Confirmed
Unprovoked Shark Attacks (N=2,035)
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Risk of Shark attack in US
SHARKSHits/Att Deaths Att Deaths
Lightning (year) 179.7* 44.9* 11.4 0.5
Alligator 365 13 503 8 Tornadoes 1036 69 213 2
Bicycles 4476 107 37 1
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Animal Related Deaths - USA
Animal AverageNumber of
FatalitiesPer Year
• Deer (Vehicular Collisions) 130• Dogs 18• Snakes 15• Mountain Lions 0.6• Sharks 0.4
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Equipment Year
Number of
Injuries
Nails, screws, tacks, and bolts 1996 198,849
Ladders 1996 138,894
Toilets 1996 43,687
Pruning, trimming, edging 1996 36,091
Chain saws 1996 13,458
Pliers, wire cutters, and wrenches 1996 15,957
Manual-cleaning equipment 1996 14,386
Power grinders, buffers, and polishers 1996 13,458
Buckets and pails 1996 10,907
Room deodorizers and fresheners 1996 2,599
Toilet-bowl products 1996 1,567
Paints or varnish thinners 1996 1,549
Shark injuries in U.S.A. 1996 13
Home Improvement
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Florida Beaches 2000
Estimated attendance 264,156,728
Lifeguard provision of medical care
236,642
Lifeguard rescues from drowning
70,771
Drowning (lifeguard areas) 12
Drowning (non-lifeguard areas) 62
Fatalities (causes other than drowning)
58
Total fatalities 132
Unprovoked shark attack 23
Shark attack fatalities 0