Blastula stage occurs in development Porifera Diploblasts Lophotrochozoa Triploblastic Bilateral symmetry Spiral cleavage Ecdysozoa Cuticle molting Deuterostomia Radial cleavage Classification Cnidaria Platyhelminthes Nemertina Rotifera Ectoprocta Mollusca Annelida Nematoda Arthropoda Echinodermata Chordata C Calcarea C Hexactinellida C Demospondiae Choanocytes DIAGNOSTIC CELL TYPE Cnidocytes DIAGNOSTIC CELL TYPE containing stinging organelles nematocysts Rhynchocoel cavity with proboscis muscular tissue with poisonous stylet Similar to Tardigrada crytobiosis and Onycophora Classification based on mode of development DIAGNOSTIC FEATURE WVS Organization Porifera Cnidaria Platyhelminthes Nemertina Rotifera Ectoprocta Mollusca Annelida Nematoda Arthropoda Echinodermata Chordata Cellular level Asconoid Syconoid Leuconoid Cell types choanocytes amoebocytes porocytes pinacocytes Tissue level 2 body types polyp and medusa Mesoglea lies between epidermis and gastrodermis Organ level C Trematoda oral and ventral suckers modified cuticle epidermis C Cestoda scolex head region with rostellum for attachment cuticle proglottids Organ level Organl level Organ level Colonial operculum trap door that seals opening of zooecium exoskeleton apartment chitin or CaCO3 Polymorphic zooids avicularia defense vibracula cleaning Organ level Body head foot visceral mass Mantle secretes calcareous shell covers visceral mass functions in excretion gas exchange reproduction Organ Segmentation metamerism tagmatization Organ level Organ level Metameric segmented with tagmosis Chelicerata pedipalps booklungs bookgills cephalothorax spinnerets no antennae Trilobita trilobed body Crustacea two pairs of antennae biramous appendages head thorax cephalothorax abdomen mandibles maxillae 2 pairs naupilus larvae Organ level Organ level Embryonic Development Porifera Cnidaria Platyhelminthes Nemertina Rotifera Ectoprocta Mollusca Annelida Nematoda Arthropoda Echinodermata Chordata None Diploblastic epidermis ectoderm and gastrodermis endoderm Triploblastic aceolomate Triploblastic aceolomate Eutely Triploblastic psuedocoelomate fate of blastocoel persists Eucoelomate protostome Triploblastic euceolomate protostome Pericardium Rochophore larvae except Cephalopoda Triploblastic eucoelomate protostome Lined by peritoneum Eutely Triploblastic psuedoceolomate blastocoel persists Protostome triploblastic endo meso ectoderm Eucoelomate Naupilus larvae Deuterostome Radial cleavage Deuterostomes Symmetry Porifera Cnidaria Platyhelminthes Nemertina Rotifera Ectoprocta Mollusca Annelida Nematoda Arthropoda Echinodermata Chordata None Radial oral and aboral ends Bilateral Bilateral Bilateral None Bilateral Bilateral Bilateral Bilateral cephalization Bilateral larvae Adults with pentaradial symmetry Holothyroidea secondarily bilateral Bilateral Skeleton Support Porifera Cnidaria Platyhelminthes Nemertina Rotifera Ectoprocta Mollusca Annelida Nematoda Arthropoda Echinodermata Chordata Spicules SiO2 CaCO3 Spongin protein fibers Mesohyl acellular jelly inside spongin Gastrovascular cavity Hydrostatic skeleton Mesoglea CaCO3 skeleton C Anthozoa Hydrostatic skeleton Mesenchyme provides support Hydrostatic Exoskeleton zooecium Shell pen derived from mantle CaCO3 Hydrostatic skeleton Acicula rigid bundles of chaeta in Polychaeta Hydrostatic skeleton cuticle collagen Pseudocoelom is a closed fluid filled sac Chitinous exoskeleton jointed appendages antagonistic muscles flexors and extensors Appendages occur in pairs one pair per segment Molting Cuticle chitin secreted by hypodermis tissue Apodeme site for muscle attachment Echinoidea spiny skin dermal endoskeleton calcareous spines or ossicles embedded under skin tests when ossicles are fused to form armor External anatomy Asteroidea and Echinoidea pedicellariae dermal branchiae paplle madreporite ambulacral groove Water vascular system derived from coelom muscles control movement Pedicellariea jaws like spines used for defense antifouling Dermal branchiae outpocketing of epidermis for gas exchange Madreporite opening to WVS Notochord or axial and appendicular endoskeleton fibrous cartilaginous calcified Movement Locomotion Porifera Cnidaria Platyhelminthes Nemertina Rotifera Ectoprocta Mollusca Annelida Nematoda Arthropoda Echinodermata Chordata Sessile GVC Hydrostatic skeleton Circular and longitudinal muscles C Hydrozoa velum ring of tissue inside of the bell in medusa stage to reduce opening for jet propulsion Circular longitudinal transverse muscles Hydrostatic skeleton Mesenchyme provides support C Trematoda oral and ventral suckers Circular and longitudinal muscles Corona crown of cilia Pedal glands spurs used for attachments Circular longitudinal muscles Sessile or encrusting with swimming larvae Foot Cephalopoda jet propulsion Bivalvia sessile diggers swimmers Longitudinal and circular muscles Peristaltic movement Hydrostatic skeleton C Polychaeta parapodia C Hirudinea anterior and posterior suckers Longitudinal muscles whiplike motions Jointed exoskeleton Arthrodial membranes thin flexible joints WVS tube feet cirri Legs and stuff Sensory Nervous Porifera Cnidaria Platyhelminthes Nemertina Rotifera Ectoprocta Mollusca Annelida Nematoda Arthropoda Echinodermata Chordata None Statocysts statoliths balance organs Ocelli photosensitive organs Nerve net plexus C Scyphozoa rhodopalia sensory pits contain eye spots Nerve ladder ocelli auricles Cephalization Ocelli light sensing Auricles chemoreception Cerebral ganglion dorsal ventral nerve cord Cerebral ganglion dorsal ventral nerve cord Pair of ventral nerve cords for foot Pair of dorsal nerve cords for body organs Sensory organs eyes osphradia chemosensory statocysts balance chemoreceptors tactile organs Ventral nerve cord ganglion in each segment cerebral ganglion Cerebral ganglion dorsal ventral nerve cord Double ventral nerve cord with metameric ganglia Fusion of ganglia C Insecta ommatidium compound eyes fused ganglia tympanic membranes sense vibrations Nerve ring and radial nerves in ambulacral ridge Tube feet Ocellus Dorsal hollow nerve cord Digestion Feeding Porifera Cnidaria Platyhelminthes Nemertina Rotifera Ectoprocta Mollusca Annelida Nematoda Arthropoda Echinodermata Chordata Filter feeding choanocytes Suspension feeders No digestive cavity Extracellular digestion in GVC and intracellular digestion in gastrodermal cells Incomplete Nematocysts for prey capture Incomplete GVC C Turbellaria eversible pharynx tri lobes gut C
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