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Published byAmberlynn Flowers Modified over 6 years ago
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Lampreys are good!
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Lampreys are...facesucking vampires?
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lampreys hagfish Chondrichthyes Osteichthyes
Cyclostomata Gnathostomata Cyclostomata Vertebrata
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lampreys hagfish Chondrichthyes Osteichthyes
Cyclostomata Gnathostomata Cyclostomata Vertebrata Cranium 3-part brain Vestibular apparatus Neural crest cells Paired sensory organs Segmented vertebral column
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lampreys hagfish Chondrichthyes Osteichthyes
Cyclostomata Gnathostomata myelinated neurons paired appendages jaws bone Vertebrata
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lampreys hagfish Chondrichthyes Osteichthyes
"Placoderms" Cyclostomata Gnathostomata "Ostracoderms" jaws bone
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Myomeres and evolution of musculature
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Evolution of axial skeleton: Development of vertebrae
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Paired pelvic and pectoral fins
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Vestibular apparatus
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Myelination of nerves
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Tripartite brain structure, cerebellum
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Evolution of jaws from branchial arches
1. Early vertebrate: unjointed branchial basket (support structure) 2. Early pre-gnathostome: jointed branchial arches, stronger branchial muscles (stronger inspiration and expiration) 3. Late pre-gnathostome: extensive development of anterior (mouth) arches 4. Anteriormost arches as functional jaws (grasping prey and other items), second arches (hyoid) as jaw supports
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Paleozoic shark: Cladoselache
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Mesozoic shark: Hybodus
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Galea: great white shark
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Galea: basking shark
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Squalea: frill shark
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Squalea: cookie-cutter shark
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Squalea: sawshark
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Galea: hammerhead shark
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Squalea: angel shark
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Batoidea
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Batoidea: Alaskan skate
Batoidea: longnose skate
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Batoidea (Rhinobatidae): guitarfish
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Batoidea (Torpediniformes): electric ray
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Batoidea (Myliobatiformes): stingray
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Batoidea (Myliobatidae): manta ray
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Holocephali claspers
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Holocephali: ratfish
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