II Animal Diversity b Ecdysozoans 3 Arthropod Phyla

II. Animal Diversity b. Ecdysozoans 3. Arthropod Phyla a. Phylum Trilobita - jointed appendages on every segment - dominated in Paleozoic (600 – 250 mya)

II. Animal Diversity b. Ecdysozoans 3. Arthropod Phyla b. Phylum Chelicerata 1. Diversity Eurypterids (“Sea Scorpions”)

II. Animal Diversity b. Ecdysozoans 3. Arthropod Phyla b. Phylum Chelicerata 1. Diversity Eurypertids Horseshoe “Crabs”

II. Animal Diversity b. Ecdysozoans 3. Arthropod Phyla b. Phylum Chelicerata 1. Diversity Scorpions Arachnids Spiders Mites Ticks

II. Animal Diversity b. Ecdysozoans 3. Arthropod Phyla b. Phylum Chelicerata 2. Biology - first terrestrial animals – 450 mya (scorpion-like)

II. Animal Diversity b. Ecdysozoans 3. Arthropod Phyla b. Phylum Chelicerata 2. Biology - first terrestrial animals – 450 mya - two body segments: cephalothorax (fusion) abdomen

II. Animal Diversity b. Ecdysozoans 3. Arthropod Phyla b. Phylum Chelicerata 2. Biology - first terrestrial animals – 450 mya - two body segments: cephalothorax (fusion) abdomen - Fusion of abdominal segments

II. Animal Diversity b. Ecdysozoans 3. Arthropod Phyla b. Phylum Chelicerata 2. Biology - first terrestrial animals – 450 mya - two body segments: cephalothorax (fusion) abdomen - Fusion of abdominal segments - Gills or “book lungs”

II. Animal Diversity b. Ecdysozoans 3. Arthropod Phyla c. Phylum Myriapoda 1. Diversity Pauropods

II. Animal Diversity b. Ecdysozoans 3. Arthropod Phyla c. Phylum Myriapoda 1. Diversity Pauropods Centipedes

II. Animal Diversity b. Ecdysozoans 3. Arthropod Phyla c. Phylum Myriapoda 1. Diversity Pauropods Centipedes Millipedes

II. Animal Diversity b. Ecdysozoans 3. Arthropod Phyla c. Phylum Myriapoda 2. Biology - spiracles for breathing

II. Animal Diversity b. Ecdysozoans 3. Arthropod Phyla d. Phylum Crustacea 1. Diversity Remipede

II. Animal Diversity b. Ecdysozoans 3. Arthropod Phyla d. Phylum Crustacea 1. Diversity Decapods (Shrimp, Loster, Crabs)

II. Animal Diversity b. Ecdysozoans 3. Arthropod Phyla d. Phylum Crustacea 1. Diversity Decapods (Shrimp, Loster, Crabs) Copepods Barnacles

II. Animal Diversity b. Ecdysozoans 3. Arthropod Phyla d. Phylum Crustacea 2. Biology - three body regions - appendages modified for different functions; head for senses (antennae) and feeding; thorax for locomotion; abdomen for reproduction.

- appendages modified for different functions; head for senses (antennae) and feeding; thorax for locomotion; abdomen for reproduction.

II. Animal Diversity b. Ecdysozoans 3. Arthropod Phyla e. Phylum Hexapoda 1. Diversity - Collembola

II. Animal Diversity b. Ecdysozoans 3. Arthropod Phyla e. Phylum Hexapoda 1. Diversity - Collembola - Protura

II. Animal Diversity b. Ecdysozoans 3. Arthropod Phyla e. Phylum Hexapoda 1. Diversity - Collembola - Protura - Insecta

II. Animal Diversity b. Ecdysozoans 3. Arthropod Phyla e. Phylum Hexapoda 2. Biology - spiracles

II. Animal Diversity b. Ecdysozoans 3. Arthropod Phyla e. Phylum Hexapoda 2. Biology - spiracles - Fusion of segments into three regions: head, thorax, abdomen

II. Animal Diversity b. Ecdysozoans 3. Arthropod Phyla e. Phylum Hexapoda 2. Biology - spiracles - Fusion of segments into three regions: head, thorax, abdomen - Flight in insects

II. Animal Diversity b. Ecdysozoans 3. Arthropod Phyla e. Phylum Hexapoda 3. Why are there SO MANY insect species? ? increase probability of geographical isolation - flight: high powers of dispersal increase probability of establishing a population - tough: exoskeleton resists desiccation - small: so they are unlikely to get back to the same place the left. - fecund: have lots of offspring

II. Animal Diversity C. Bilateria 1. Protostomes – blastopore forms mouth a. Lophotrochozoans b. Ecdysozoans 2. Deuterostomes – blastopore forms anus a. Echinodermata b. Hemichordata c. Chordata

II. Animal Diversity C. Bilateria 2. Deuterostomes – blastopore forms anus a. Echinodermata 1. Diversity - sea stars

II. Animal Diversity C. Bilateria 2. Deuterostomes – blastopore forms anus a. Echinodermata 1. Diversity - sea stars - sea cucumbers

II. Animal Diversity C. Bilateria 2. Deuterostomes – blastopore forms anus a. Echinodermata 1. Diversity - sea stars - sea cucumbers - sea urchins

II. Animal Diversity C. Bilateria 2. Deuterostomes – blastopore forms anus a. Echinodermata 2. Biology - “biradial symmetry”

II. Animal Diversity C. Bilateria 2. Deuterostomes – blastopore forms anus a. Echinodermata 2. Biology - “biradial symmetry” - internal skeleton – calcified plates

II. Animal Diversity C. Bilateria 2. Deuterostomes – blastopore forms anus a. Echinodermata 2. Biology - “biradial symmetry” - internal skeleton – calcified plates - filter feeders (Sea Lily), herbivores (sea urchins), predators (sea stars).

II. Animal Diversity C. Bilateria 2. Deuterostomes – blastopore forms anus b. Hemichordata – Acorn Worms

II. Animal Diversity C. Bilateria 2. Deuterostomes – blastopore forms anus b. Hemichordata – Acorn Worms - pharyngeal gill slits - hollow dorsal nerve tube

II. Animal Diversity C. Bilateria 2. Deuterostomes – blastopore forms anus c. Chordata: Four Key Characters

II. Animal Diversity C. Bilateria 2. Deuterostomes – blastopore forms anus c. Chordata: Four Key Characters - Pharyngeal Gill Slits

II. Animal Diversity C. Bilateria 2. Deuterostomes – blastopore forms anus c. Chordata: Four Key Characters - Pharyngeal Gill Slits - Hollow Dorsal Nerve Tube

II. Animal Diversity C. Bilateria 2. Deuterostomes – blastopore forms anus c. Chordata: Four Key Characters - Pharyngeal Gill Slits - Hollow Dorsal Nerve Tube - Post-anal tail

II. Animal Diversity C. Bilateria 2. Deuterostomes – blastopore forms anus c. Chordata: Four Key Characters - Pharyngeal Gill Slits - Hollow Dorsal Nerve Tube - Post-anal tail - notochord – a rigid supporting rod

II. Animal Diversity C. Bilateria 2. Deuterostomes – blastopore forms anus c. Chordata: Four Key Characters 1. Urochordata - Tunicates

II. Animal Diversity C. Bilateria 2. Deuterostomes – blastopore forms anus c. Chordata: Four Key Characters 1. Urochordata – Tunicates - 4 traits as larva

II. Animal Diversity C. Bilateria 2. Deuterostomes – blastopore forms anus c. Chordata: Four Key Characters 1. Urochordata – Tunicates - 4 traits as larva - mobile as larva

II. Animal Diversity C. Bilateria 2. Deuterostomes – blastopore forms anus c. Chordata: Four Key Characters 1. Urochordata – Tunicates - 4 traits as larva - mobile as larva - become sedentary as adults (filter)

II. Animal Diversity C. Bilateria 2. Deuterostomes – blastopore forms anus c. Chordata: Four Key Characters 2. Cephalochordata – Lancelets

II. Animal Diversity C. Bilateria 2. Deuterostomes – blastopore forms anus c. Chordata: Four Key Characters 2. Cephalochordata – Lancelets - 4 traits - burrowers - filter feeders