Phylum PlatyhelminthesMajor Life Stages
Habitat / Life Cycle Free-living (terrestrial/marine) or parasitic. Support / Skeleton None Sensory Nervous System Simple nervous system with ganglia. Feeding / Digestion
Pharynx and blind gut. Excretion / Osmoregulation Diffusion via Flame Cells. Transport / Circulation Diffusion Gas Exchange / Respiration Diffusion through a moist outer layer of skin. Life History / Reproduction Sexual/Asexual (splitting) reproduction. Generally hermaphroditic. Classes
N/A Body Symmetry Bilateral Distinguishing Characteristics Nearly entirely flat, very little dimension Class Dissections We dissected a flatworm using a dissection microscope. |
Phylum NematodaMajor Life Stages
Habitat / Life Cycle Free-living (terrestrial/marine) or parasitic. Support / Skeleton Central body cavity containing a pseudocoelom. Sensory Nervous System Simple nervous system with ganglia. Feeding / Digestion
Predators or decomposers with a complete gut. Excretion / Osmoregulation Diffusion Transport / Circulation Diffusion Gas Exchange / Respiration Diffusion Life History / Reproduction Sexual reproduction of seperate sex organisms. Parasites require host transfer. Classes
N/A Body Symmetry Bilateral Distinguishing Characteristics
None |
Phylum AnnelidaMajor Life Stages
Habitat / Life Cycle Free-living (terrestrial/marine) or parasitic Support / Skeleton Body cavity with a true coelom and septa between its' segments. Sensory Nervous System Full nervous system with an attached brain. Feeding / Digestion
Parasites or hunter/scavengers with a pharynx or jaws, and a complete gut with an anus. Excretion / Osmoregulation Excretes ammonia waste via nephridia. Transport / Circulation Closed circulatory system with a dorsal blood vessel operated by a 5-part heart. Gas Exchange / Respiration Circulatory system Life History / Reproduction Hermaphroditic, sexually reproducing organisms. Classes
Bilateral Distinguishing Characteristics
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