bio phyla

Porifera

no symmetry, no body cavity, no tissues, sessile, filter feeder, hermaphrodites (ex. sponges)

Cnidaria

radial symmetry, no body cavity, polyps, medusa, diploblastic, mouth+an single opening, cnidocyte (ex. sea anemones, jellyfish, corals)

Ctenophora

radial symmetry, no body cavity, no stinging cells, origin of multicellular eukaryotes, diploblastic (ex. comb jellies)

Platyhelminth

bilateral symmetry, compact body cavity, nutrients/gas/waste exchange → diffusion, nervous system, hermaphrodites (ex. flatworms - tapeworms, fluke)

Rotifera

bilateral symmetry, fluid-filled, aquatic habitat, cilia at mouth, protostome - full digestive tract - mouth → an (ex. brachionus, philodina, rotaria)

Nematodes

bilateral symmetry, hemocoel, tough/molted cuticle, complete digestive systems, longitudinal muscles (ex. roundworms - no segmentation)

Annelids

bilateral symmetry, coelom - closed circulation, segmentation (ex. leeches, earthworms)

Mollusks

bilateral symmetry, coelom, muscular foot, visceral mass, mantle - makes the shell (ex. clams, oysters, snails, octopi)

Arthropoda

bilateral symmetry, hemocoel, exoskeleton - shell of chitin, jointed appendages (ex. crabs, millipedes/centipedes, insects)

Echinoderms

bilateral symmetry, coelom, tube feet, most spines, deuterostomes, “test”-shell (ex. sea urchins, sea cucumbers, sea/brittle stars)

Chordates

bilateral symmetry, coelom, notochord, post-anal tail, hollow nerve cord, pharyngeal slits (ex. humans, reptiles, mammals)