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1a. Has both animal and plant characteristics - usually distinctly
green; usually have
stigma (light- sensing spot); often
have single flagellum (tail-like,
propellor).
............................................................... Phylum
Euglenophyta
1b. Rarely with any plant characteristics; take in and digest food
objects.................................................................................................. 2
2a. Swim using many small, hair-like cilia, or crawl with leg-like
fused
cilia. Phylum Ciliophora ................................
Class
Ciliata
2b. Always parasitic; very small; generally unable to move
.
................................................................. Phylum
Apicomplexa
2c. Swim using one or more flagella, and/or may crawl or float
using cell extensions, pseudopods.
Phylum Sarcomastigophora................................................ 3
3a. Have one or more flagella
........................ Subphylum
Mastigophora
3b. Crawl or float with pseudopods. Subphylum Sarcodina.................. 4
4a. Pseudopods are very thin, used to help floating; may have
shell.
.................................................................... Class
Actinopodea
4b. Pseudopods are very or fairly thick, used for crawling.
Class
Rhizopodea..........................................................................
5
5a. Pseudopods of moderate thickness; have
shells.
.......................................................................
Subclass Filosia
5b. Have thick, blobby pseudopods; may have simple shells.
Subclass
Lobosia......................................................................... 6
6a. Shells are made of collected particles, or of
chitin.
....................................................................... Order
Arcellinida
6b. Do not have shells; cell has clear zone (ectoplasm) near
membrane with grainy zone (endoplasm) farther
in.
....................................................................... Order
Amoebida
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