Kingdom PROTISTA II: Diversity (protist study images)
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Taxon | Viable as 1 cell? |
Cell differentiation? |
Cell interdependence? |
Cell coordination? |
Three body layers? |
Colonial choanoflagellates |
most | some | some | no? | no | Volvox | yes | yes | some | yes | no | Swarming ciliates & sarcodines |
yes | yes | yes | yes | no | Porifera (sponges) |
no | yes | yes | yes | yes |
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- The evolutionary gain of membrane-bound organelles was likely step-wise, not all at once
i) single flagellum (=monociliated) surrounded by a ring of microvilli
ii) flagellum bears a distinctive flagellar vane
iii) diplosome- an odd anchor structure to the flagellum (2 basal bodies); does occur in a few dinoflagellates, but they have functional flagella attached to both basal bodies (only occurs in 2 other protist groups)
Also, feeding mode is similar: fine particles are captured by microvilli and then phagocytized
Copyright (c) 2017 by A. Richard Palmer. All rights reserved.
(revised Dec. 19, 2016)