Ap 11 invertebrates

• Fw & m Porifera• Suspension feeders• Lack true tissue• Asymmetrical• Sequential hermaphrodites – (1 then other)• Produce antibiotics & other defensive cmpds – (Pettit @ AzSU cribostatin – can kill penicillin resistant strains of Strep & looking for anticancer cmpds)

Cnidarians• True tissue 4 classes:• Gastrovascular cavity (mouth = anus)• 2 forms: polyp & medusa• Cnidocytes• Nematocysts (stinging cells)

Back to CnidariansHydrozoa• Most m, few fw• Polyp & medusa stages in most sp• Polyp stage often colonial

Back to CnidariansScyphozoa • All m • Polyp reduced • Free swimming medusa • Up to 2m in d

Back to Cnidarians Cubozoa• All m• Box-shaped medusa• Highly toxic cnidocytes – Sea wasp (Chironex fleckeri) n Australia • Intense pain • Respiratory failure • Cardiac arrest • Death w/in min • Amt of poison in 1 org can kill 60 people

Back to CnidariansAnthozoa • All m • Medusa absent • Most sessile • Many colonial

Platyhelminthes• Bilateral symmetry 4 classes:• Free living & parasitic• Microscopic -20m• Triploblastic• Acoelomate

Back to Platyhelminthes Turbellaria • Mostly m, some fw, few terr • Predators & scavengers • Body surface ciliated

Back to Platyhelminthes Monogenea • M & fw parasites • Most infect surfaces of fishes • Simple life history • Ciliated larva starts host infection

Back to Platyhelminthes Trematoda • Parasites of mainly verts • 2 suckers attach to host • Most life cycles include intermediate hosts

Back to Platyhelminthes Cestoda• Parasites of verts• Scolex attaches to host• Proglottids prod eggs and break off after fert• No head of digestive system• Lc with 1 or more intmdt host

Rotifers• Specialized organ systems• Alimentary canal (digestive tube w/2 openings)• Psuedocoelomate• Parthenogenesis (only females – make only females from unfert eggs)

Ectoprocts - bryozoansLophophorates• Lophophore – horseshoe- shaped or circular crown Phoronids – tube- dwelling marine worms of ciliated tentacles that surround mouth• Coelomates Brachiopods – lamp shells – dorsal /ventral shells instead of bivalve lateral

Nermeteans• Proboscis & ribbon worms• Acoelomate• 1mm-sev m• Some toxic• Motly m• Swim or burrow• Closed circulatory system, no heart

Molluscs• Mostly m, some fw, some terr• Soft bodied• Most protected by CaCO3 shell, some have reduced, internal shell or no shell• Muscular foot, visceral mass, mantle, radula• Trochophore (ciliated larval stage)• 4 classes:

Chitons• Polyplacophora• M• Shell w/8 plates• Foot for locomotion• Radula• No head

Gastropods• Torsion• Asymmetrical body• Foot for locomotion• Radula

Bivalves• M & fw• Flattened shell w/2 halves• Head reduced• No radula• Paired gills• Most suspension feeders• Mantle forms siphons

Cephalopods• Head surrounded by grasping tentacles• Locomotion by jet propulsion using siphon made from foot• Only mollusc w/ closed circ sys

Annelids• Segmented worms, fw & damp soil• Length <1mm-3m• 3groups: Oligochaeta Polychaeta Hirudinea Reduced head Well developed head Body flattened No parapodia Each segment has Reduced coelom and chaeta parapodia w/chaeta seg Tube dwelling & free Chaetae ab living Suckers @ ant & post ends Parasites, predators & scavengers

Nematodes• Roundworms• most widespread of all animals• Cuticle – tough outer coat• Alimentary canal• No circ sys, nut spread thru fluid in psd-c• Soil• Trichinosis

Arthropods• Hard exoskeleton (protein + chitin) – Molting/ecdysis• Jointed appendages• Open circ sys• 4 groups:

Cheliceriformes• 1-2 main body parts• 6 prs of appendages• Mostly terr or m

Myriapoda•Distinct head w/antenna•Chewing mouth parts•TerrMillipedes Centipedes• Herbivorous • Carnivorous• 2 prs walking legs/segment • 1 pr walking legs/segment • Poison claws on first body segment

Hexapoda• 3 body segments• Antenna present• Mouthparts modified for chewing, sucking or lapping• 3 prs of legs• Us. 2 prs of wings• Mostly terr

Crustacea• Body 2-3 parts• Antenna pres• Chewing mouthparts• 3+ prs of legs• Mostly m & fw

DeuterostomesEchinoderms Chordates• Spiny skin • Doral hollow nerve cord• Slow moving or sessile • Notochord• Water vascular sys • Post anal tail• Tube feet • Pharyngeal slits• Radial (adult) bilateral (larvae)• 6 groups

Ap 11 invertebrates

by mrsjacobs

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Ap 11 invertebrates Presentation Transcript