MOLLUSCS

Exception, slugs, have no shell. They use a single foot to move around. || Their shells have two valves, joined like a hinge (bisagra) Their head is not differentiated from the rest of the body. Their single foot has the shape of an axe and they use it to excavate. || The foot surrounds the head and has the shape of tentacles for capturing prey || Snails have a rasping tongue in her mouth, called radula. || =====They feed by filtration (They are filter-feeding)===== || Carnivores ||
 * || **//3-1//** **// GASTROPODS //** || **//3-2 BIVALVES//** || **//3-3 CEPHALOPODS//** ||
 * HABITAT || Terrestrial, they live in damp soil || Aquatic animals || Aquatic animals ||
 * BODY || They have a **spiral-shaped shell** with a single valve.
 * NUTRITION || Herbivores (n) Or hervivorous(adj.)
 * RESPIRATION || They breathe through lungs || They breathe through gills || They breathe through gills ||
 * ** SYMMETRY ** || ** Bilateral ** || Bilateral || Bilateral ||
 * ** EXAMPLES ** || ** Garden Snails, sea snails, slugs ** (have no shell)
 * ** EXAMPLES ** || ** Garden Snails, sea snails, slugs ** (have no shell)

|| ** Clams ** (almeja), **cockles** (berberecho),
 * Mussels, oyster **

|| ** Squids have an internal shell ** **Nautilus** ||
 * Cuttlefish (sepia, calcified shell) **
 * Octopus, octopi(plural) they have no shell **


 * =4-ARTHROPODS. They are the most widespread group of living things: more than one million species. They live in water, fresh water and on land. They have jointed legs and an external skeleton. Their bodies are divided into 3 parts: head, thorax and abdomen or in 2 parts: cephalothorax and abdomen. = || **// 5-ECHIINODERMS //** ||
 * || **// 4.1.- ARACHNIDS- //** || **// 4.2.- CRUSTACEANS //** || **// 4.3.- MYRIAPODS //** || **// 4.4.- INSECTS //** ||  ||
 * **// HABITAT //** || ** Terrestrial ** || ** Aquatic ** || ** Terrestria **** l ** || ** Most of them areTerrestrial **, some aquatic || ** Marine animals ** ||
 * ====== RESPIRATION ====== || ** Trachea or **
 * Book lungs ** || ** Gills ** || ** Trachea ** || They breath through **trachea or gills** (aquatic) || ** Gills ** ||
 * ====== BODY ====== || 2 regions
 * CEPHALOTHORAX: **

They have **8 legs**


 * ABDOMEN: **, with glands || 2 regions; **CEPHALOTHORAX:**

10 legs two antenae
 * ABDOMEN; **
 * Divided into segments, with apendix ** || ** Head ** :


 * Body has one pair of legs ** (centipedes and scolopendras)

or **two pairs of legs in each** Two antennae
 * ring (millipede) ** || ** 3 regions: **
 * Head: **

6 legs
 * THORAX: **

Cylindrical (**sea cucumber)** Like a star (**starfish)** An internal skeleton made up of plaques. No separate head, but there is a mouth on the underside. || Carnivorous: Scavengers: Parasite: Filtering, || ** Carnivorous, scolopendra ** Vegetal juice: butterfly || ** Carnivorous, ** some starfish eat clams or another starfish, extracorporal digestion || . Crab, the front legs have claws for defence || Scolopendras are venomous and predator || They change their outer covering (MOULT),
 * ABDOMEN ** || Rounded (**sea urchin)**
 * ====== SYMMETRY ====== || ** Bilateral ** || ** Bilateral ** || ** Bilateral ** || ** Bilateral ** || ** Radial ** symmetry in adults ||
 * NUTRITION || ** Carnivorous **
 * Predatory ** || Herbivorous:
 * Predatory ** || Herbivorous:
 * Herbivorous **, centipede || ** Herbivorous ** : grasshoper
 * Carnivorous: mantis **
 * Scavengers: beetle **
 * Parasite ** : louse, lice
 * **// CHARACTERÍSTICS //** || Spiders catch their prays with their **spiderweb** || Hard exoescheleton made of chitin

and some undergo metamorphosis. || Internal skeleton made up of plaques. The ambulacral system, internal tubes filled with water, enables movement. Ambulacral feet with suckers || || Lobsters, langosta crabs, cangrejos shrimps, gambas
 * **// EXAMPLES: //** || Spiders, scorpions and mites (ácaro)
 * barnacle **, percebe

|| Centipede, scolopendra and millipede





|| Butterfly, ant, bee, wasp Earwig,( tijereta) Flea, pulga. firefly, luciérnaga, moth, polilla, cockroach Mosquito Ladybird Locust,( langosta) Praying mantis dragonfly (libélula) || Sea urchins, Starfish, Brittle star(lirios de mar), sea cucumbers, ||