I. Coelomate Animals A. Have a true coelom, not a pseudocoelom B. True coelom is a hollowed out space inside the mesoderm, not a space between tissue layers C. Coelom provides space for organs to develop

II. Gastrulation = Formation of gastrula. A) Indentation creates opening called blastopore B) Blastopore either becomes mouth or anus C) Protostome = blastopore becomes mouth D) Deuterostome = blastopore becomes anus

III. Groups of Animals have Coeloms (Coelomates) Protostomes mouth forms first Phylum Mollusca Phylum Annelida Phylum Arthropoda Deuterostomes anus forms first Phylum Echinodermata Phylum Chordata

IV. Traits of All Coelomates A) multicellular B) true tissues C) bilaterally symmetrical D) triploblastic E) have alimentary canal (complete digestive system) F) have a coelom Draw a phylogenetic tree including Porifera, flatworms, round worms, rotifers, proterospongia, coleolmates, cnidarian,

Phylum Mollusca = mollusks Respiration by gills, lung or diffusion All have hearts & open circulatory systems Blood leaves heart in an artery Blood flows out the open ends of the artery to circulate directly through tissues and sinuses Blood funneled back to heart to be pumped again

Specialized Mollusk Traits Mantle :membrane covering that may secrete a shell Radula = feeding structure that may be like a file, a drill or a beak https://www.youtube.com/watch?v=cEMK3VN8pW8 https://www.youtube.com/watch?v=2BsYejyH8e0 https://www.youtube.com/watch?v=tfMY0fW8UwE Muscular Foot = used for locomotion

Class Bivalvia Name means 2 shells Most are filter feeders Clams, oysters, mussels, scalops

Class Gastropoda Name means Stomach-Foot snails, slugs & nudibranchs (sea slugs)

Class Cephalopoda Name means head-foot Squids, octopuses, nautiluses, cuttlefish

Giant Squid! Largest invertebrate Up to 60 ft long This one was a young female 24 ft long The first live giant squid ever captured Large size made possible by myalinated nerves and closed circulatory system http://shapeoflife.org/video/molluscs-survival-game

Cephalopod Derived Traits : Adaptations of a Predator Shell filled with chambers of air for buoyancy Shells lost or small & internal = less weight Closed circulatory system = faster circulation for better delivery of oxygen to muscles Well developed eyes and brain = must be smarter than the food Foot converted to tentacles and siphon (jet propulsion)

Phylum Annelida:Segmented worms Earth worms Leeches Marine Worms Freshwater worms

Annelid traits Body divided into segments Respiration by diffusion or gills (skin must be damp to breath by diffusion) Excretion by true nephridia in each segment Alimentary canal Closed circulatory system (blood always in vessels or heart) Ganglia with ventral nerve cords http://www.npr.org/player/v2/mediaPlayer.html?action=1&t=1&islist=false&id=9105956&m=9105957 http://shapeoflife.org/video/annelids-powerful-and-capable-worms

Worm Specialized Digestive organs: 1) pharynx: sucks in/swallows food 4 2 5 3 1 Worm Specialized Digestive organs: 1) pharynx: sucks in/swallows food 2) Esophagus: pushes food to crop 3) Crop: stores food 4) Gizzard: grinds food 5) Intestine: absorbs nutrients

Circulatory System 1) aortic arches: pump blood (5 ‘hearts’) 2) dorsal blood vessel: brings blood to arches 3) ventral blood vessel: carries blood from arches 4) smaller blood vessels: branch off 2 & 3 4) capillary beds: deliver nutrients connect 2 & 3

Hydrostatic skeleton: Muscles pull against water filled body cavity coelomic fluid Circular muscles: elongate segment Longitudinal muscles: shorten segment Setae (bristles): anchor worm

Reproduction: Sexual only Hermaphrodites: produce both egg and sperm then trade  Clitellum: forms cocoon for fertilized eggs Internal fertilization: eggs fertilized inside cocoon

Phylum Arthropoda Subphylum Crustacea Class Insecta Class Arachnida Classes Diplopoda/chilopoda

Arthropod Traits Name means jointed-foot Also have jointed legs Segmented bodies Exoskeleton Open circulatory system Ganglia fused into simple brain ventral nerve cords Complete digestive system

Insect Innovations Respiration using tracheae –tubes that branch throughout the body Compound eye Wings Complex life cycle

Arachnids Respiration by book lungs spiders ticks mites Scorpions harvestmen May have silk glands to make web

Crustacea Nearly all aquatic Respiration by gills Important part of zooplankton