lecture 11 bild 3

lecture 11 bild 3 - BILD 3 February 2, 2009 Living chordate...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
BILD 3 February 2, 2009 Woodruff: vertebrates 1 Living chordate classes Agnatha: jawless, cartilaginous, notochord lampreys, hagfish Chondrichthyes: cartilaginous sharks & rays, jaws, vertebrae replace notochord, gills Actinopterygii: ray-finned bony fish Lobed-finned fish: coelacanths, lungfish Amphibia: aquatic larval stage, metamorphosis, tetrapods Reptilia: terrestrial tetrapods with shelled amniotic egg, scales, some marine & freshwater. Aves: feathers, wings, endothermic Mammalia: tetrapods, hair, mammary glands, diaphragm, endothermic SOLITARY & COLONIAL TUNICATES LARVA Notochord Dorsal hollow nerve cord Pharynx with gill slits Tail FOUR MAJOR CHARACTERISTICS OF CHORDATES Fig. 34-2 Lobed fins Legs Amniotic egg Milk Jaws, mineralized skeleton Lungs or lung derivatives Vertebral column Head Notochord Common ancestor of chordates ANCESTRAL DEUTERO- STOME Echinodermata (sister group to chordates) Chondrichthyes (sharks, rays, chimaeras) Cephalochordata (lancelets) Urochordata (tunicates) Myxini (hagfishes) Petromyzontida (lampreys) Mammalia (mammals) Actinopterygii (ray-finned fishes) Actinistia (coelacanths) Amphibia (frogs, salamanders) Dipnoi (lungfishes) Reptilia (turtles, snakes, crocodiles, birds) Chordates Craniates Vertebrates Gnathostomes Lobe-fins Osteichthyans Tetrapods Amniotes FIG. 34.2 CHORDATE PHYLOGENY CHORDATES Notochord – dorsal rod Gill slits Hollow dorsal nerve cord Tail Cephalochordata: lancets Urochordates: tunicates Head ( craniates ) hagfish Vertebral column ( vertebrates ) lampreys Jaws, mineralized skeleton (gnathostomes) chondrichthys: sharks, rays Lungs or lung derivatives: ray-finned fish CHORDATES (CONTINUED) Lungs or lung derivatives Ray-finned fish (osteichthyes) Lobed fins Coelacanth Lungfish Legs (tetrapods) Amphibians Amniotic egg (amniotes) Reptiles (now includes the birds) Hair & milk Mammals
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
BILD 3 February 2, 2009 Woodruff: vertebrates 2 CEPHALOCHORDATA: LANCET Hagfish: most primitive craniate lineage surviving. No jaw or vertebrae
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 02/23/2009 for the course BILD BILD3 taught by Professor Henterheather during the Winter '08 term at UCSD.

Page1 / 7

lecture 11 bild 3 - BILD 3 February 2, 2009 Living chordate...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online