Comparison Chart - Porifera Symmetry Germ Layers...

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Porifera Cnidarians Platyhelminthes (planarians) Annelida (earthworm) Mollusca Echinodermata Arthropoda Chordata (rat) Symmetry Asymmetrical Radial Oral and aboral surfaces Bilateral Bilateral Bilateral Bilateral in larvae Radial in adults (only coelomic invertebrate) Bilateral Bilateral Germ Layers N/A Two germ layers Epidermis: ectoderm Gastrodermis: endoderm Mesoglea: between, filled extra-cellular matrix Three germ layers Ectoderm, mesoderm (muscle tissue), endoderm No body cavity Three Three Three Three Three Development N/A N/A N/A Protostome Protostome Deuterostome Protostome Deuterostome Cephalization No Some, anterior end, eye spots Cerebral ganglia: “brain” Somes Suprapharyngeal ganglia Minimal in bivalves, some in gastropods, extensive in cephalopods None Highly developed, complex social patterns Yes Level of Organization Cell, lacks true tissues Tissue with specialized cells: epithelial, digestive, muscle-like (contractile), sensory Lack organs Organs Organs Organs Cell level Organs Organs Coelom No No No (acoelomate) Yes Yes Yes, well developed, large Yes, reduced Yes Segmentation/ Metamerism No Some internal Yes: segmentation, somites Repetition of hearts, nephridia, reproductive Only in one genus Segments may have fused Respiratory Diffusion Diffusion Diffusion Diffusion through skin Ctenidia: gas exchange Diffusion through dermal branchiae, epithelium Spiracles, trachea, tracheoles Gills Pharynx larynx trachea bronchi bronchioles alveoli Circulatory Chaonocytes with flagella beat to create current of water, filter Nutritive- muscular cells contain flagella that move fluid in GVC Diffusion Diffusion Closed circulatory system Dorsal blood vessel, hearts pump blood Median ventral blood vessel Pigment: hemoglobin, dissolved in blood, no red blood cells Open circulatory system Pigment: hemocyanin dissolved in plasma Orange heart beats to create pressure Hemolymph bathes tissues, collected by sinuses to ctenidia and heart Water vascular system Madreporite stone canal ring canal radal canals lateral canals ampulla, tube feet Open circulatory system, dorsal vessel Hemolymph No pigment Open circulatory system with heart heart arteries tissue sinuses central sinus gills pericardial sinus heart Hemocyanin Vena cava right atrium tricuspid valve right ventricle pulmonary artery lungs
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Comparison Chart - Porifera Symmetry Germ Layers...

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