Nematoda Flashcards
nematodes belong to the group ______
Ecdysozoans
what defines the Ecdysozoans
the molecular evidence
what covers members of the Ecdysozoans
cuticle
synapomorphy for Ecdysozoans
ecdysis AKA moulting
how do members of Ecdysozoan get bigger
by ecdysis or moulting of their cuticle
least to most inclusive
Nematoda: Ecdysozoans: Bilaterian: Eumetazoan: Metazoan
how can one describe Ecdysozoans in terms of their species
it’s the most species rich (mainly because of the insects)
what is one reason for the huge diversity in Ecdysozoans
niche proliferation (they can access a wide range of ecological niches that other animal cannot)
Nematoda AKA
roundworms
two traits that CONTRAST Nematodes from Annelids
- they lack segmented bodies
- they lack circular muscles
what type of canal do nematodes have
alimentary (2 holes)
what do nematodes lack
a circulatory system
reproduction in nematodes
usually sexual via internal fertilization
are most nematodes diecious or hermaphroditic
diecious
why do nematode zygotes survive well
they are resistant to severe environmental conditions
is a cuticle the same thing as an exoskeleton
NO
how do nematodes facilitate growth
they periodically shed their cuticle and secrete a larger one
where do free-living nematodes live
aquatic or soil habitats
where do parasitic nematodes live
moist tissue of plants OR body fluids and tissues of animals
importance of nematodes
- decomposition
- nutrient cycling
true or false
most animals and plants have nematode parasites
YES
why are nematodes so good at parasites
they have an incredible molecular warfare that allows them to act as viruses
