Caenorhabditis elegans
Most Famous Nematode
Arachnida
Spiders
Merostomata
Horseshoe crabs
Pycnogonida
Sea spiders
Chilopoda
Centepedes
Diplopoda
Millipedes
Hexapoda
Insects
Malacostraca
Crabs, Lobsters, Crawfish
Thecostraca
Barnacles
Asteroidae
Starfish
Echinoidea
Sea Urchins
Holothuroidea
Sea Cucumbers
Crinoidea
Sea lillies
Ophiuroidea
Brittle Stars
Protochordates
Tunicates and Lancelets
Pikaia
Primative chordates from the middle cambrian period (Found in BC)
Myllokunmingia
Primative chordates from the Lower cambrian period (Found in China)
Ostracoderm
Jawlessfishes with bony armor
Placoderm
Early jawed fishes, have armored plating
Acanthodian
Jawed fishes with spines to support their fins and cartilaginous skeleton
Chelicerates
Spiders, horseshoe crabs, sea spiders, scorpians, Have chelicerae, pedipalps prosoma and opisthosoma
Urochordata
Sea squirts and Tunicates
Cephalochordate
Lancelets
Myriapoda
Centipedes and millipeds, Head and trunk, no compound eye
Crustacea
crustaceans and hexapods, 2 pairs on antennae
Clitellata
Land-based and freshwater segmented worms (earth worms and leeches) -> have clitellum
Polychaetes
Marine segmented worms - prostomium- peristomium-trunk-pygidium -> Have parapodia and setae
Sedentaria
Tube worms
Errantia
Non tube worms
Lophotrochozoa
have a larval stage and ciliated tentacles for feeding
Hemicordata
Deuterostomes -> use muccus to feed NON CORDATES
Chordates
1. Hollow Dorsal Nerve Cord
2. Notocord
3. Phyingial gill slits
4. Endostyle or thyroid
5. Post Anal tail
Myxini
Hagfish
Petromyzontida
Lampreys
Agnatha
Jawless Fish
Gnathostomata
Jawed fishes
Elasmobrancii
Sharks, skates and rays
Holocephali
Ratfish and Chimaeras
Chondrichthyes
Cartilaginous Fishes
Batoids
Skates and Rays
Lamnidae
Salmon shark Family