Lampreys are good!. Lampreys are good! Lampreys are...facesucking vampires?

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Presentation transcript:

Lampreys are good!

Lampreys are...facesucking vampires?

lampreys hagfish Chondrichthyes Osteichthyes Cyclostomata Gnathostomata Cyclostomata Vertebrata

lampreys hagfish Chondrichthyes Osteichthyes Cyclostomata Gnathostomata Cyclostomata Vertebrata Cranium 3-part brain Vestibular apparatus Neural crest cells Paired sensory organs Segmented vertebral column

lampreys hagfish Chondrichthyes Osteichthyes Cyclostomata Gnathostomata myelinated neurons paired appendages jaws bone Vertebrata

lampreys hagfish Chondrichthyes Osteichthyes "Placoderms" Cyclostomata Gnathostomata "Ostracoderms" jaws bone

Myomeres and evolution of musculature

Evolution of axial skeleton: Development of vertebrae

Paired pelvic and pectoral fins

Vestibular apparatus

Myelination of nerves

Tripartite brain structure, cerebellum

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

Paleozoic shark: Cladoselache

Mesozoic shark: Hybodus

Galea: great white shark

Galea: basking shark

Squalea: frill shark

Squalea: cookie-cutter shark

Squalea: sawshark

Galea: hammerhead shark

Squalea: angel shark

Batoidea

Batoidea: Alaskan skate Batoidea: longnose skate

Batoidea (Rhinobatidae): guitarfish

Batoidea (Torpediniformes): electric ray

Batoidea (Myliobatiformes): stingray

Batoidea (Myliobatidae): manta ray

Holocephali claspers

Holocephali: ratfish

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