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Live Protozoa Specimens >> Amoeboids (Sarcodina)


Actinosphaerium

ActinosphaeriumThe actinophryids are a small, familiar group of heliozoan protists. They are the most common heliozoa in fresh water, and are especially frequent in lakes and rivers, but a few are found in marine and soil habitats as well. Each is unicellular and roughly spherical in shape, without any shell or test, and with many pseudopodia supported by axopods radiating outward from the cell body, which adhere to passing prey and allows it to roll or float about. The outer portion of the cell, or ectoplasm, is distinct and is filled with many tiny vacuoles, which assist in flotation. A few contractile vacuoles around the periphery of the cell expel excess water, and are visible as clear bulges when full.

There are two genera included here. Actinophrys have a single, central nucleus. Most are around 40-50 μm in diameter, with axopods up to 100 μm in length, though this varies. Actinosphaerium are several times larger, from 200-1000 μm in diameter, with many nuclei, and are found exclusively in fresh water. Two other genera, Echinosphaerium and Camptonema, have been described but appear to be synonyms.

Description Price SelectQuantity
Actinosphaerium - Class 30 $ 6.20
Actinosphaerium - Class 60 $ 11.80
Actinosphaerium - Class 120 $ 20.00
Actinosphaerium - Class 150 $ 24.00
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Amoeba Proteus

Amoeba ProteusThe Amoeba proteus is an amoeba closely related to the giant amoebae. It belongs to the Rhizopoda, more specifically to the Phyllum Sarcodina.

This large protozoon uses tentacular protuberances called pseudopodia to move and phagocytosize smaller unicellular organisms, which are enveloped inside the cell's cytoplasm in a food vacuole, where they are slowly broken down by enzymes.

The Amoeba proteus possesses a nucleus containing granular chromatin, and is therefore an eukaryote.

Description Price SelectQuantity
Amoeba Proteus - Class 12 $ 5.60
Amoeba Proteus - Class 30 $ 6.20
Amoeba Proteus - Class 60 $ 11.80
Amoeba Proteus - Class 90 $ 16.50
Amoeba Proteus - Class 120 $ 20.00
Amoeba Proteus - Class 150 $ 24.00
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Arcella

Arcella

Protists or protoctista is a name used for all single cellular life forms that are neither animals, plants, fungi or bacteria.

This shelled amoeba, Arcella, (Pictured to the right) lives in a protective 'test' Pseudopodia can be seen reaching out the opening at the bottom. Thin strands anchor the amoeba to its house.

Description Price SelectQuantity
Arcella - Class30 $ 6.20
Arcella - Class 60 $ 11.80
Arcella - Class 120 $ 20.00
Arcella - Class 150 $ 24.00
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Pelomyxa Carolinensis

Pelomyxa CarolinensisPelomyxa are giant amoebae, usually 500-800 μm but occasionally up to 5 mm in length. The most notable species is P. palustris; other described species may be synonyms, or have been moved to the unrelated genus Chaos. They are found in mud at the bottom of freshwater streams.

Pelomyxa have anywhere from two to several hundred nuclei. A moving cell is cylindrical in shape, with a single hemispherical pseudopod at the front and a semipermanent projection called a uroid at the back, which is covered in tiny non-motile flagella. They consume a wide variety of food, and have many vacuoles containing whatever particles that happen across, both food such as diatoms and debris such as sand.

This is one of several genera of amoebae that lack mitochondria. As such it has been considered as possibly one of the most primitive eukaryotes, and given its own phylum (Pelobionta or Caryoblastea). However the absence is now known to be secondary. It is grouped with the other amitochondriate genera as the Archamoebae, which are now placed among the Amoebozoa.

Description Price SelectQuantity
Pelomyxa Carolinensis - Class 30 $ 8.50
Pelomyxa Carolinensis - Class 60 $ 16.00
Pelomyxa Carolinensis - Class 90 $ 23.00
Pelomyxa Carolinensis - Class 120 $ 30.00
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Niles Biological, Inc.
9298 Elder Creek Road
Sacramento, CA 95829
(916) 386-2665