Animal Kingdom Invertebrate Phylum Animal Kingdom characteristics o

Animal Kingdom Invertebrate Phylum

Animal Kingdom characteristics o o o Eukaryotic Heterotrophic Multicellular Most sexual reproduction, asexual = budding, fragmentation No cell walls

Symmetry o Asymmetry o Radial symmetry Bilateral symmetry o

Porifera

The sponge o o o Asymmetric Cell level of organization Cool characteristics: n n n Choanocytes Amoeboid cells Spicules/spongin Mostly Asexual reproduction sessile

Cnidarians

anthozoa, hydrozoa, scyphozoan o o Symmetry - radial Tissue layer of organization Gastrovascular cavity Cool characteristics n n n Mesoglea Cnidocytes, nematocysts 2 body forms: polyp and medusa

Nemertea and Platyhelminthes

Ribbon worms and flatworms o o o Bilateral symmetry Gastrovascular cavity Sensory cells Level of organization? Cool characteristics n n Proboscis apparatus Free living or parasitic flatworms Cephalization Gas exchange through diffusion

Benefits of coelom – body cavity o o o Freer body movements – outer wall independent of gut Ample space allows for growth of organs Fluid protects organs from damage Storage for reproductive, digestive wastes prior to being expelled Hydrostatic skeleton – muscle contraction against fluid in cavity

Nematoda and Rotifera

Roundworms and rotifers o o o Bilateral Symmetry Pseudocoelomates Cool characteristics n n parasitic roundworms – Ascaris, Trichinella, filarial worms – dogs (heartworm) humans (elephantiasis) Crown of cilia – corona, locomotion

Protostomes Deuterostomes Mulluscs, annelids, arthropods o Spiral and determinate cleavage o Blastopore is mouth o Coelom forms by a splitting of the mesoderm o o o Echinoderms and chordates Radial and indeterminate Blastopore is anus Coelom forms by outpocketing of primitive gut

Mollusca

mulluscs o o o Bilateral Symmetry Coelomates Cool characteristics n n n 3 part body plan (mantle, foot, visceral mass) Open circulatory system in most 3 main classes o o o Bivalves Gastropoda cephalopoda

Annelids

Segmented worms o o Bilateral Symmetry Segmentation Digestive system with specialized regions Cool characteristics n n n Marine worms, earth worms and leeches Setae – bristles that anchor the worm hermaphroditic

Arthropods

Jointed appendages o o Bilateral Symmetry Cool characteristics n n n Exoskeleton of chitin, molt Segmentation is modified for specialization Well developed nervous system Variety of respiratory organs Metamorphosis – complete/incomplete

Echinoderms

Spiny skin o o Symmetry – radial-(adults) and bilateral-(larvae) Cool characteristics n n Primarily bottom dwellers Larvae are free swimming filter feeders with bilateral symmetry Endoskeleton made of spiny calcium rich plates called ossicles Water vascular system - locomotion