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This Concept Map, created with IHMC CmapTools, has information related to: Vertebrates-Group 3, Fishes ???? Ray-finned fishes (Actinopterygii), The Evolution of Vertebrates Some chordates lack vertebrae Invertebrate Chordates, Chondrichthyes Skeleton composed of cartilage, though often impregnatedwith calcium Viviparous: the young develop within the uterus & recieve nutrients from the mothers blood through a yok sac placenta, Chondrichthyes Skeleton composed of cartilage, though often impregnatedwith calcium Oviparous: lay eggs that hatch outside mothers body, Chondrichthyes Skeleton composed of cartilage, though often impregnatedwith calcium Examples: Sharks, Rays spotted ratfish, Hagfish (myxini) Flexible rod of cartilage They have tooth-like formations made of the protein keratin, Gnathostomes Derived characteristics include Mineralized/bony skeleton, Ray-finned fishes (Actinopterygii) ???? The fins supported by rays and have rigid skeletons. their body has morphed over years and the fin structure that affects the maneuvering, defence, and other functions., Chondrichthyes Skeleton composed of cartilage, though often impregnatedwith calcium Operculum: gills located in chambers covered by a protective bony flap, Fishes ???? Lobe-finned fishes (Sarcopterygii), Osteichthyes Aquatic osteichthyans are called Fishes, Jawless fishes (Cyclostomes) rudimentary vertebrae Lampreys (petromyzontida), Ray-finned fishes (Actinopterygii) ???? They can obtain the food and interferes with migratory pathways and sprawling grounds., Hagfish (myxini) Flexible rod of cartilage Slime glands that can repel other animals, Mineralized/bony skeleton Some would replace bone with cartilage Chondrichthyes, Lobe-finned fishes (Sarcopterygii) d the key diverse features are the presents of the rod-shaped bones surrounded by a thick layer of muscle in their pectoral and pelvic fins., Osteichthyes Derived characteristics include lungs or a gas-filled swim bladder derived from lungs, segmented fin rays, bone, and bony scales and jaws are presented, Vertebrates Would develop jaws Gnathostomes, Chondrichthyes Skeleton composed of cartilage, though often impregnatedwith calcium Cloaca: chamber that has a single opening to the outside, Vertebrates Derived characteristics include Skull and development of vertebrae