Invertebrates!!!

Porifera (Pore-bearing) Symmetry: Asymmetrical Feeding: Filter-feeders Habitat: Aquatic (mostly marine) Movement: Larvae= motile, Adults= sessile Reproduction: Asexual (budding) and Sexual

Cnidaria (“stinging cells”) Symmetry: Radial Feeding: Sting and capture food Habitat: Aquatic, mostly marine Movement: Polyp= sessile, Medusa= free-swimming Reproduction: Asexual and sexual

Special features –Coral= colonial –Have nerve nets (network of nerve cells that allow it to detect stimuli) –Nematocysts: stinging cells Polyp Medusa

Platyhelminthes (Flatworms) Symmetry: Bilateral Feeding: Parasites (absorb), carnivores, scavengers Habitat: Aquatic (freshwater and marine), Terrestrial, within a host, very diverse Movement: Motile Reproduction: Asexual (regeneration) and sexual

Special features: –No body cavity (that’s why they’re flat!) –One opening for food and waste. Planarian Tapeworm

Nematoda (Roundworms) Symmetry: Bilateral Feeding: Carnivores, Parasites, Scavengers Habitat: Aquatic, terrestrial, within a host, very diverse Movement: Motile Reproduction: Sexual (internal fertilization)

Special features –Two body openings Ascaris (Heartworms) Hookworms Trichonella worms (causes Trichinosis)

Symmetry: Bilateral Feeding: Carnivores, Scavengers, Parasites, very diverse Habitat: Terrestrial and Aquatic Movement: Motile Reproduction: Mostly sexual (external fertilization for separate sexes), some species are hermaphroditic Annelida (Segmented Worms)

Special features –Well-developed nervous system (brain and nerve cords Earthworms Leeches

Mollusca (“Soft body”) Symmetry: Bilateral Feeding: Herbivores, Carnivores, Filter- feeders, Scavengers, or Parasites Habitat: Aquatic and Terrestrial Movement: Motile (very diverse ways, even jet propulsion!) Reproduction: Sexual (often external fertilization)

Special features : –Gastropods: shell-less or single- shelled mollusks that move by using a muscular foot (ex: slugs, snails)

Bivalves: Have two shells held together by one or two muscles –Ex: clams, oysters, mussels

Cephalopods –Squids, Octopi, and Chambered Nautiluses

Echinodermata Symmetry: Five-part radial Feeding: Carnivores and scavengers Habitat: Marine Movement: Motile, most use tube feet Reproduction: Sexual (external fertilization)

Special features : Spiny skin, Internal skeleton, Water vascular system, and tube feet (suction) Ex: Sea stars, starfish, sand dollars, and sea cucumbers

Arthropoda Symmetry: Bilateral Feeding: Herbivores, carnivores, and omnivores Habitat: Aquatic and Terrestrial, VERY diverse Movement: Motile, using well- developed groups of muscles Reproduction: Sexual (internal and external fertilization)

Special features –Exoskeleton: tough external covering –Molting –Jointed appendages –Respiration: trachael tubes, spiracles, book lungs –¾ million species indentified !

Crustaceans Ex: crabs, lobsters, shrimps