flatworms and roundworms Flashcards
what are some acoelomates orders/fams
phylum Platyhelminthes, Nemertea, Gnathrostomula
what are the size range of flatworms
from microscopic to 30m long
which species of flatworms are parasitic and which are free living
class turbellaria are free living and trematode and cestodes(tapeworms)
what are some characteristics of flatworms
bilaterally symmetrical, blind gut, in parasites sometimes no guts, no body segments, hermaphrodites
how do tapeworms maximise reproductive success
by creating large numbers or progeny in egg sacks found before them
what is different in the epidermis of free living flatworms
the epidermis of free living flatworms is ciliated
why are flatworms flat
flatworms are flat due to a lack of a circulatory system or celom so body plan is flattened to maximise surface area
how do turbellarian heads help them
they contain light and chemo sensors to locate food
what is a digenean
a parasite that has multiple hosts
what’s a monogenean
a parasite that has a single host, such as salmon flukes
what is a trick used to maximise reproductive output by monogeneans such as salmon flukes
developing an embryo with another embryo developing inside that
what are the most relevant species in pseudocoelomates
nematodes
what are the characteristics of nematodes
only longitudinal muscles, complete gut, complex cuticle, separate sexes
what is Ascaris and why is it important
it is a pig and human parasite found in around 25% of the population
what is a ceolom
a fluid filled cavity
