BIOMI 3310 Lecture Notes - Lecture 5: Haplosporidium Nelsoni, Ascetosporea, Cercozoa
Document Summary
Several phyla are difficult to maintain in laboratory cultures: all are descendants of a heterotrophic eukaryote with 2 flagella, monophyletic group, composed of 3 phyla, cercozoa: some are parasitic, mostly heterotrophic protozoa. Includes most amoeboids and flagellates that that feed via filose pseudopods (never have a true cytostome or mouth) Includes eukaryotes with filose (thread-like) pseudopods: glide on surfaces instead of swimming. The spore has a distinctive lid and extraneous filaments: urosporidium spp. : internal diaphragm (tucked inside the aperture) covers the spore orifice: hyperparasites of trematode sporocysts or metacercariae, or juvenile nematodes. Found in aquatic snails: before it was identified, it was given the name sso (seaside organism, ex. ) : in marine polychaetes and mollusks: have spores with prominent extensions, foraminifera (position of this group is controversial): predators, amoeboids with reticulose (net-like) pseudopods, common as marine benthos, chara(cid:272)terized (cid:271)y .
