Classification See page 4 Organization Organ Organ System Nematoda Arthorpoda Development Triploblastic Nematoda Arthorpoda Echinodermata Chordata Deuterostomes Echinodermata Chordata Protostomes Arthropoda Nematoda Eucoelomates Arthropoda Echinodermata Pseudocoelomates Nematoda Bryozoa Rotifera Symmetry Bilateral Nematoda Arthropoda Chordata excludes Urochordata Pentaradial Echinodermata Larvae bilateral Holothuroidea secondarily bilateral Echinodermata Chordata Skeleton Support Hydrostatic Skeleton Nematoda Exoskeleton Arthropoda Echinodermata dermal exoskeleton Endoskeleton Chordata Bone carilage or other Axial skeleton vertebae and appendicular skeleton girdles and limbs Movement Pseudocoelomates Bryozoa and Rotifera circular and longitudinal muscles Larvae are free swimming Adults are sessile Nematoda only longitudinal muscles Move with whip like motions Arthropoda Paired jointed appendages One pair segment Wings Abdominal flexion Echinodermata Water Vascular System Tube Feet Arms in Crinoidea Chordata Complex muscle interactions Movement by undulation or limbs is common Sensory Nervous Pseudocoelomates Bryozoa simple nervous system Rotifera and Nematoda bilobed gangila the brain Both have papillae dermal projections Only Rotifera have ocelli simple eyes Arthropoda Central nervous system Ganglion w ventral nerve cord Echinodermata Nerve ring w radial nerves in ambulacral ridge Ocelli on arms Chemosensory feet Chordata Dorsal hollow nerve cord Complex array of sensory systems Digestion Feeding Comlete Digestive System Arthropoda Echinodermata Have 2 stomachs cardiac eversible and pyloric connects cardiac to rest of digestive system Chordata Pseudocoelomates Bryozoa U shaped gut Excretory Pseudocoelomates Bryozoa diffusion Rotifera protonephridia Circulation Diffusion Pseudocoelomates Respiration Psuedocoelomates Diffusion Nematoda Renette glands no cilia Arthropoda Very Diverse Echinodermata Water vascular system Excretes waste across walls of papulae pockets of epidermis Have no osmoregulation Chordata Nephridia Kidneys Open Circulatory System Arthropoda Closed Circulatory System Chordata Have hemoglobin 2 to 4 chambered heart Water Vascular System Echinodermata Arthropoda Chelicerata book gills water and book lungs land Insecta Tracheae Crustacea gills on land except for terrestrial isopods which have psuedotracheae Echinodermata Papulae Tube feet Water Vascular System Holothuroidea also use arms Chordata Gills Lungs Skin Air bladders Reproduction Dioecious Nematoda Arthropoda Have paired reproductive organs Have larval stage and metamorphosis Echinodermata Chordata Oviparous Ovoviparous Viviparous External or internal Monecious Bryozoa Asexual stratoblasts Amitic Mitic Rotifera Encysted eggs Classification Pseudocoelomates Superphylum Lophotrophozoa o Phylum Bryozoa o Phylum Rotifera Superphylum Ecdysozoa o Phylum Nematoda Phylum Echinodermata Class Asteroidea sea stars starfish Class Echinodeea sea urchins sand dollars sea biscuits Class Ophiuroidea brittle stars and basket stars Class Holothuroidea sea cucumbers Class Crinoidea sea lilies and feather stars Phylum Chordata Subphylum Urochordata tunicates ascidians sea squirts Subphylum Cephalochordata lancelets Subphylum Vertebrata o Superclass Agnatha jawless fishes Class Myxini Hagfish o Class Osteichthyes bony fishes o Class Chondrichthyes cartilaginous fishes sharks skates rays Phylum Arthropoda Subphylum Trilobitmorpha trilobites Subphylum Chelicerata o Class Merostomata Order Xiphosura horseshoe crabs o Class Pycnogonida sea spiders o Class Arachnida Order Acari mites ticks Order Aranease spiders scorpions Subphylum Crustacea o Class Branchiopoda fairy shrimp o Class Ostracoda seed shrimp o Class Malacostraca o Class Cirripedia barnacles Subphylum Myriapoda o Class Chilopoda centipedes o Class Diplopoda millipedes Subphylum Hexapoda o Class Insecta Subclass Pterygota Division Exopterygota Order Isopoda isopods Order Decapoda crabs shrimps lobsters crayfish o Order Orthoptera crickets locusts o Order Isoptera termites o Order Odonata dragonflies o Order Hemiptera true bugs o Order Homoptera leafhoppers cicadas Division Endopterygota o Order Coleoptera beetles o Order Lepiodoptera scaled wings butterflies moths o Order Hymenoptera married wings bees wasps ants o Order Diptera two wings flies mosquitos
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