fluid filled space surrounded by mesoderm
coelom with mesoderm on one side
coelom surrounded by mesoderm
regeneration<---asexual reproduction in Dugesia
regeneration(pulling apart by sticking and ripping)
nerve ladder and ganglia
exretory tubules and flame cells
parasite life cyle: lives in intestine, leaves, dries up, sticky eggs stick and are ingested
complete digestive tract, nerve ladder and ganglia,
some free living, some parasites
intestinal wall--eggs in intestine--ingested eggs--intestinal wall
intestinal wall--larvae into muscles form cysts--ingested muscle, intestinal wall
intestinal wall--released--eggs hatch--free living--crawl in through unprotected skin--lungs--up throat--cough and swallow--intestine
complete digestive tract: mouth, pharynx, crop, gizzard, intestine, anus
cerebral ganglia, ventral nerve cord (so that there are nerves connecting to every segment)
Dorsal and ventral blood vessels, aortic arches (heart)
Setae (chitin brissles), polychaetes have parapodia
Leeches and polychaetes
Reproduction in earthworms
ventral sides touching and clitellum line up and secrete enough mucus for sperm to swim through. Once the sperm have swum (lol), worms separate.
Seminal receptacles receive sperm and hold it
Clitellum secrets mucus package and leave eggs and sperm in it as it hardens. Eggs and sperm fertilize. Once womr has moved completely out, mucus package collapses, leaving a packet of goo, which seals. In packet is trochophore larva which is aquatic.
When packet bursts, little worms come out.