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Invertebrates. Summary. Symmetry. Diploblastic vs Triploblastic. Embryonic Development. Body Cavity. Blastopore Devlopment. Porifera. Porifera. Asymmetrical No true tissue No body cavity Sessile Filter feeders. Cnidaria. Diploblastic No body cavity Radial symmetry
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Invertebrates Summary
Porifera • Asymmetrical • No true tissue • No body cavity • Sessile • Filter feeders
Cnidaria • Diploblastic • No body cavity • Radial symmetry • Gastrovascular cavity • Nematocysts
Bilateral symmetry • Triploblastic • Protostome • Acoelomate • Cephalized • Flame cells maintain osmotic balance • Mouth, pharynx, & gastrovascular cavity Platyhelminthes
Bilateral symmetry Cephalized Triploblastic Protostome Pseudocoelomate Nematoda
Bilateral symmetry Triploblastic Protostome Coelomate Open circulation Nephridia Gills ClassGastropodaClassBivalviaClassCephalopoda Mollusca
Annelida Bilateral symmetry Triploblastic Coelomate Protostome Segmentation Closed circulation Respiratory skin Esophagus, crop, gizzard Nephridia (2 per segment)
Arthropoda Triploblastic Protostome Coelomate Open circulation Exoskeleton Jointed appendages Gills, Tracheal system, or book lungs Malpighian tubules
Intestine Stomach Digestive gland Brain Heart Eyes Poison gland Ovary Anus Book lung Spinnerets Sperm receptacle Gonopore (exit for eggs) Pedipalp Chelicera Silk gland Figure 33.32 Arthropoda • ClassCrustaceaClassArachnaClassInsecta
(a) Larva (caterpillar) (b) Pupa (c) Pupa (d) Emerging adult (e) Adult Figure 33.6a–e Complete Metamorphosis
Echinoderms Radial or bilateral symmetry Triploblastic Coelomate Deuterostome Endoskeleton Water vascular system Tube feet