INVERTEBRATES They dont have backbone they dont have
![INVERTEBRATES: They don’t have back-bone : they don’t have internal skeleton (p 59) - INVERTEBRATES: They don’t have back-bone : they don’t have internal skeleton (p 59) -](https://slidetodoc.com/presentation_image_h2/61949a720d50d561130c12b0e543729d/image-1.jpg)
INVERTEBRATES: They don’t have back-bone : they don’t have internal skeleton (p 59) - Most primitive animals are in this group - Some groups have body protection such as shells or external skeletons - Some groups have jointed legs
![Most Primitive animals Poriferans Cnidarians Body protected with an exoskeleton Worms Molluscs Arthropods Echinoderms Most Primitive animals Poriferans Cnidarians Body protected with an exoskeleton Worms Molluscs Arthropods Echinoderms](http://slidetodoc.com/presentation_image_h2/61949a720d50d561130c12b0e543729d/image-2.jpg)
Most Primitive animals Poriferans Cnidarians Body protected with an exoskeleton Worms Molluscs Arthropods Echinoderms Jointed legs Poriferans Cnidarians 1 - Acuatic animals 2 - radial symetry -bag-like shape -Umbrela shape 3 - Tentacles 1 - Acuatic animals 2 - No symetry/radial symetry 3 - Full of pores Nutrition function - No complex systems - Filter feeders (choanocytes) Interaction function - Attached to a substrate - Body supported structure: Needle-like structures: spicules Reproduction Asexual reproduction by budding Nutrition function Gastrovascular cavities (mouth) Interaction function - Coral and Hydrae attached to a substrate - Tentacles full of cnidocytes with a thread Reproduction Asexual reproduction by budding
![Most Primitive animals Poriferans Cnidarians Body protected with an exoskeleton Worms Molluscs Arthropods Echinoderms Most Primitive animals Poriferans Cnidarians Body protected with an exoskeleton Worms Molluscs Arthropods Echinoderms](http://slidetodoc.com/presentation_image_h2/61949a720d50d561130c12b0e543729d/image-3.jpg)
Most Primitive animals Poriferans Cnidarians Body protected with an exoskeleton Worms Molluscs Arthropods Echinoderms Jointed legs Worms 1 - Acuatic /Parasits / terrestial 2 - bilateral symetry 3 - long and have soft bodies Nutrition function - Digestion/circulatory/excretory simple systems. - Cutaneous respiration Interaction function - Parasits - Regenerate part of their bodies -They move in the earth by little hairs Reproduction - Sexual reproduction: Hermaphrodites - Asexual reproduction: fragmentation flat-worm: Platyhelminthes Plannarians tapeworm Round-worm: Nematodes ring-worm: Annelides Earth-worm Flat-worm
![Most Primitive animals Poriferans Cnidarians Body protected with an exoskeleton Worms Molluscs Arthropods Echinoderms Most Primitive animals Poriferans Cnidarians Body protected with an exoskeleton Worms Molluscs Arthropods Echinoderms](http://slidetodoc.com/presentation_image_h2/61949a720d50d561130c12b0e543729d/image-4.jpg)
Most Primitive animals Poriferans Cnidarians Body protected with an exoskeleton Worms Molluscs Arthropods Echinoderms Jointed legs Molluscs 1 - Acuatic or terrestial 2 - bilateral symetry 3 - they have a protective shell Parts of the body organized for vital functions: Head – sense organs for Interaction function Muscular food – moving, digging or catching prey (interaction function) Visceral mass – organs for nutrition function and sexual reproduction (hermaphrodites or have both different sex) Gastropods (Snails, slugs, limpets) Shell: spiral shape Radula: Mouth *herbivorous Bivalve (mussels, clams, oysters) Shell: 2 valves * Water filters Chephalopods (Internal Shell, Tentacles and mandible) *carnivorous
![Most Primitive animals Poriferans Cnidarians Body protected with an exoskeleton Worms Molluscs Arthropods Echinoderms Most Primitive animals Poriferans Cnidarians Body protected with an exoskeleton Worms Molluscs Arthropods Echinoderms](http://slidetodoc.com/presentation_image_h2/61949a720d50d561130c12b0e543729d/image-5.jpg)
Most Primitive animals Poriferans Cnidarians Body protected with an exoskeleton Worms Molluscs Arthropods Echinoderms Jointed legs Arthropods 1 - Aquatic/ terrestial / adapted to fly 2 - bilateral symetry 3 - bodies protected with exoskeleton 4 - Jointed appendages Parts of the body organized for vital functions: Singularities regarding their vital functions Nutrition function Excretory system: Malpighian tubes Respiratory system: tracheae (internal tubes ending in a operture) Interaction function Simple or Compound eyes Head --- Thorax --- Abdomen Cephalothorax --- Abdomen Head ------- trunk Reproduction Oviparous and some undergo Metamorphosis (they molt their exoskeletom) (complete or incomplete)
![Most Primitive animals Poriferans Cnidarians Body protected with an exoskeleton Worms Molluscs Arthropods Jointed Most Primitive animals Poriferans Cnidarians Body protected with an exoskeleton Worms Molluscs Arthropods Jointed](http://slidetodoc.com/presentation_image_h2/61949a720d50d561130c12b0e543729d/image-6.jpg)
Most Primitive animals Poriferans Cnidarians Body protected with an exoskeleton Worms Molluscs Arthropods Jointed legs Apendages related to their mouth Number of pair of legs 3 pairs Repetitions of 1 or 2 pair of legs At least 5 pairs Echinoderms
![Most Primitive animals Poriferans Cnidarians Body protected with an exoskeleton Worms Molluscs Arthropods Jointed Most Primitive animals Poriferans Cnidarians Body protected with an exoskeleton Worms Molluscs Arthropods Jointed](http://slidetodoc.com/presentation_image_h2/61949a720d50d561130c12b0e543729d/image-7.jpg)
Most Primitive animals Poriferans Cnidarians Body protected with an exoskeleton Worms Molluscs Arthropods Jointed legs Echinoderms 1 - Marine animals. Present at different depth levels 2 - radial symmetry and many different shapes 3 - their exoskeleton is under a thin cell layer the body is organized regarding its unique AMBULACRAL SYSTEM: Usefull mainly for the interaction function: For moving/ to breathe/to catch food Ambulacral system Echinoderms
![How sponges eat Snails moving through a knife Cnidocytes in Jellyfish Metamorphosis How sponges eat Snails moving through a knife Cnidocytes in Jellyfish Metamorphosis](http://slidetodoc.com/presentation_image_h2/61949a720d50d561130c12b0e543729d/image-8.jpg)
How sponges eat Snails moving through a knife Cnidocytes in Jellyfish Metamorphosis
- Slides: 8