Invertebrates: non-Arthropoda Flashcards
Porifera-name meaning
Pore bearing
Sponges
Aquatic, sessile, assymetrical, hermaphrodites, acoelomates
Porifera- feeding mechanisms
Filter feeders: collar cells take food out of water from the central cavity
Cnidarians-name meaning
stinging
Jellyfish, Anemones & corals
radial symmetry, aquatic, sessile and mobile, acoelomates
Cnidarians- Medusera life cycle
Sissile polyps release free swimming medusae which reproduce sexually
larvae find a substrate to settle on and grow
Platyhelminthes- name meaning
Flat worms
bliateral symmetry, flat body, eyespots, specialisation of different body segments, many are parasitic
Platyhelminthes- tapeworm lifecycle
Tapeworm produces eggs in the intestine of human (primary host). eggs enter the water through faeces. pigs ingest eggs, the larvae hatch and move into muscles forming a cyst, humans get tapeworms by eating infected pork.
Mollusca-name meaning
Soft
snails, clams, octopus, squid
bilateral symmetry, head, gills, guts
shell secreted externally (Gastropod, Bivaria) or internally (cephalopoda)
Annelids- name meaning
Ringed
Fan worms, bristle worms, earth worms, leech
coelomate, bilateral symmetry, segmented bodies, chaetae- bristles made of chitin, used for movement
Nematode- name meaning
Thread-like
roundworms
pseudocoelomate, separate sex, bilateral symmetry, mostly microscopic
Annelids- class identification
when using traditional classification, there are 3 classes, when using genetic evidence, 2 clades, separating mobile and less mobile groups are identified
Nematodes- what is filarisis
parasitic roundworm lays eggs in the lymph of humans causing severe swelling
Echinoderms- name meaning
Spiny Skin
Starfish, sea cucumbers, sea lilies
Marine, Bilateral symmetry in larvae, radial in adults, coelomate, separate sex, endoskeleton, water-vascular system
Animals common ancestor
Choanoflagellates
Single-celled organisms that lived together in colonies may have joined together, starting multicellularity
