Term
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Definition
1.) Jawless: Lamprey & Hagfish
2.) Jawed: Gnathnostomes |
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Term
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Definition
| -Slender soft bodied animals with mineralized mouth parts |
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Term
| Origins of Bone and Teeth |
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Definition
-early chordates filter feeders - mineralized mouth parts enabled new feeding strategy - Scavengers and predators
-Body armor derived from dental mineralization |
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Term
| Earliest Vertebrae Characteristics |
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Definition
-Jawless
-550 mya
-Bone+cartilage
-No Jaws or fins
-Heavily armored "shell skin"
-Mud suckers |
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Term
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Definition
| -Jaws develop from skeletal support of pharyngeal gill slits |
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Term
| Modern Fishes: Two Major groups |
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Definition
1. Chondrichthyes
2. Osteichthyes |
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Term
| Chondrichthyes (Characteristics and examples) |
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Definition
-Cartilagenous fish - Only Cartilage skeleton
-Paired Copulatory organs - Claspers
-Internal Fertilization
-Flattened bottom dwellers
-Enlarged Pectoral Fins
-Crush mollusks and crustaceans
-E.g. - Sharks, Skates and rays and ratfish |
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Term
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Definition
| -Evolved secondarily from mineralized skeleton |
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Term
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Definition
-200-300 Species
-Fast swimming predators
-asymmetrical tail (Heterocercal) - No gas bladder |
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Term
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Definition
-Detects motion in water (predators, prey)
-Seen in Cartilagenous fish, bony fish, and larval stages of amphibians |
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Term
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Definition
| Mechanoreceptors in lateral line system |
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Term
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Definition
Teeth fused in plates
Claspers |
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Term
| Osteichthyes Two Major Groups & Examples |
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Definition
1. Actinopterygii (Ray Finned Fish) (E.g. Perch, Salmon)
2. Sarcopterygii (Lobe finned fish) (E.g. lungfish, coelacanth) |
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Term
| Ray Finned vs. Lobe Finned Fish |
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Definition
Ray Finned: Fins supported by long, flexible rays
Lobe Finned: Muscular Fins
[image] |
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Term
| Lineages of Lobe Finned Fish |
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Definition
1. Coelacanth
2. Lungfish (Dipnoi) |
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Term
| Osteichthyes Apomorphies (2) |
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Definition
1. Bony Operculum - Protect gills
2. Air Sac (Swim or gas bladder) - Control Buoyancy |
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Term
| Swim Bladder Evolved from... |
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Definition
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Term
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Definition
Blood flow is opposite or countercurrent to flow of water
Countercurrent is more effective than concurrent |
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Term
| Single Circulation in Fishes |
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Definition
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