Invertebrates

multicellular euakryotic ingestive heterotrophs motile or have a motile stage sessile like barnacles or oysters some parasitic - have complex life histories grazing capturing prey filter feeding

spherical - in some algae radial- can be divided multiple times symmetrically bilateral - can only be divided once

sponges colony of cells motile larva sessile adult filter feeders mostly marine asexual and sexual stages can’t tolerate turbid or polluted waters

first “true” cells nerve-cells and guts 3 cell layers radial symmetry have midoblasts containing stinging thread called nematocyst 2 main stages, polyp (asexual and sessile) and Medusa (motile and sexual reproduction)

flat worms cephalization 3 layers has pharynx has GVC bilateral symmetry can be parasitic

Unsegmented roundworms. Complete digestive tract. diverse large

Less diverse less common Ancient traits still exist in organism (horsehail worm)

3 layers has pseudocoelom, a liquid in between encoderm and mesoderm

of gametes motile larva hermaphrodite complex life histories asexual reproduction (budding and fragmentation)

segmented worms detrivores and omnivores filter feeders and grazers complete digestive tract ceohalization coeloms in mesoderms earthworms and tube worms

Cephalization soft bodied, shell predators graze filter feeders open circulatory system

Radial Symmetry (a) pentaradial symmetry (a) Bilateral symmetry (b) limited learning slow moving no cephalization hydrovasculalr system tube feet functioning like eye droppers with suction cups on the bottom endoskeleton spiny skin

specialized niches specialized segments segmented jointed appendages exoskeleton made of chitin cephalization little asexeual reproduction good vision ventral nerve-chord

SP. omychophera SP. Crustacrea SP. chelicerates (arachnida) SP. uniramia (diplopoda, chilipoda, insecta) SP. Tribbita

2 pairs of walking legs slow poisonous legs faced downwards spherical detrivorous/herbivores

1 pair of walking legs flat venomous legs on the side fast predators

insects most successful group of organisms specialized niches water restrictions - excretes uric acid colonial pheromones and dances as means of communication 3 segments

pairs of 4 walking legs spiders and scorpions fused cephalothorax specialized abdomen (stings and webs)

marine - shrimp, lobsters, crab, barnacles fresh water - shrimp, daphnia Terrestrial - rolypoly, coconut crabs