Madog River Sarcodines

Drawings by Brenna Lorenz
Drawing of the bright green Acanthocystis  A sketch of Acanthocystis. The green, algae-filled center was surrounded by a distinct collar of clear cytoplasm from which the axopods appeared to radiate. On the day in which these creatures bloomed, they were in great abundance in the water sample.

Drawing of Clathrulina with its stalk and silica lattice  These beautiful, stalked heliozoans are encased in a lattice of silica and are attached to algae.

Golden, ornate, faceted arcella with pseudopods A sketch of Arcella gibbosa (?). The test is a pale golden brown or topaz color. They are extremely abundant in Madog River water, more common than the plainer Arcella hemisphaerica.

Drawing of Arcella dentata.  This ornate Arcellid, with its very large, pale golden brown test, is rare in the Madog River culture.

Sketch of Centropyxis, showing spines and off-center pseudostome.  This one appears to be a shelled sarcodine called Centropyxis aculeata. It has a large, spiny, dark-brown test, and is only moderately common in the Madog River water.

Sketch of a small naked amoeba A sketch of a small Tubuline, possibly Metachaos. This is a lively, fast-moving and rapidly changing little amoeba with several pseudopods. They are not terribly abundant in Madog River water samples.

Sketch of a tiny tubuline This extremely tiny Tubuline is similar to the one pictured above, but maintains a more equant shape. Also, it maintains a large envelope of clear protoplasm.

Sketch of a tubuline with only one pseudopod A sketch of a small Tubuline, possibly Saccamoeba. This small amoeba creates a clear bubble of cytoplasm at its "front" end and flows into it. These are not terribly common in Madog River water, but we see more of these than we do of the Metachaos type.

Sketch of my favorite tubuline, blue-gray with tiny black grains  This is a large Tubuline with very grainy, pale blue-gray cytoplasm. Most of the time it looks like Saccamoeba, above, but then it sends out long pseudopods and forms several branches to engulf particles in the water. This is a beautiful amoeba that is easy to spot because of its unusual color.

Drawing of miscellaneous small naked amoebae.  One day the slides were full of naked amoebae, including these angular, spiky-looking ones.

Drawing of unknown amoeba, possibly Multicilia lacustris.  This odd little sarcodine might be Multicilia lacustris. The round things stuck to its skinny filopodia are particles of food, which it ingests through its pseudopods.

Drawing of Difflugia, showing two pseudopods  This Difflugia has a pebbled test and a couple of lively, skinny pseudopods. Its pseudopods swing around rapidly like tentacles.

Euglypha drawing, with silica shingles and spines  This beautiful Sarcodine has a shingled shell with five long, curved spikes emerging from it. They are abundant in Madog River. Its psuedopods are extremely thin, and emerge from the narrow end of the "vase. "

Drawing of sarcodines with irregular, dirty-looking shells. This is an enormous shelled amoeba of uncertain affinity. The test is huge and looks like a glob of soil. The pseudopods are thick and robust, looking like an algal filament except for the flow of the cytoplasm. The cytoplasm is a uniform pale green color with few obvious vacuoles or inclusions.  I did get one look at the underside of a dead one, and it had a flange or collar around its opening.

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