! RADIOLARIA !
Habitat
-Radiolaria are holoplanktonic which means they are like plankton for the
whole of their lifecycle. So, like plankton, they float around the
ocean
-They are carried along in
tides throughout the ocean
Classification-Although it has proven difficult to classify Radiolaria, the flowing classification is
one of the most commonly used
Domain-Eukaryota Kingdom- Protista/Rhizaria
Subphylum-Sarcodina
Superclass-Actinopod
Phylum-Sarcomastigophora
Class-Radiolaria
-Radiolaria and Cercozoa are part of a super group called Rhizaria. Rhizaria is
species rich and contains unicellular eukaryotes.
Traits/Structure-Radiolarians are circular in shape, and are often perfectly symmetrical
- - -They are also commonly found as
zooplankton.
-Radiolarians have rough exteriors this is because of their mineral outer
skeletons
-They have hard, rodlike pseudopodia that
radiate outwards from their skeletal openings. Obviously, they do not use these
to move, they are used to trap food.
-They have a central capsule that divides their cell into outer and inner sections,
(ectoplasm and
endoplasm)
-In their outer layer of cytoplasm, radiolarians that live in
the upper 150 meters of ocean water have organisms, mostly dinoflagellates,
that have a photosynthetic symbiotic relationship with the radiolarians
Re-Production-
-The reproductive success of Radiolaria varies because they are carried from
water mass to water mass by ocean
currents
They re produce asexually through binary fission
Nutrition/Feeding-Radiolarians normally act as particle feeders but occasionally act as
predators
-They capture calcareous organisms by
ingesting them into their central food vacuole
-The
pseudopodia that radiate from their skeletal structures and act as food trappers
!CERCOZOA!
Habitat-Cercozoa are found in the soil as well as in most marine and fresh
water habitats
Classification-Many Cercozoa were once classified with groups such as Ameoboza,
Fungi and Radiolaria.
-They are in the super group Rhizaria along with
Radiolaria
Domain-Eukaryota Kingdom-Protista/Rhizaria/Cercozoa
-Because Cercozoa are considerd their own kingdom, they vary.
-Different types of cercozoa are classified as either Filose or
Reticulose.
Filose – These are the best known Cercozoa and they are found in
nutrient rich waters, soil, and sometime aquatic plants.
Reticulose- Contain a vestigial nucleolus or nucleomorph, and have
been said to have developed from green algae. They have four
membranes which bind them together.
Traits/Structure-They have pseudopodia supported by filaments in which they use to
engulf their food
with
-They vary in body type, some of them have
almost no cilia, making them more amoeba like
-Most Cercozoa are flagellates and ameob
Nutrition-They feed on Bacteria, algae, fungi and occasionally other protozoa.