Microworld

world of amoeboid organisms

Menu
Cochliopodium bilimbosum
Cochliopodium bilimbosum, with many crystals

 

Genus Cochliopodium Hertwig & Lesser, 1874

Diagnosis: amoeba discoid or spherical in shape with a central granular hump, partly or completely surrounded by a more or less distinctive hyaline margin; amoeba covered with a tectum, a single flexible layer of complex carbohydrate scales, which covers the dorsal surface of the cell, while the ventral one remains free. These microscales, also called tectal scales, can be seen with a light microscope as a dense layer of punctations; small subpseudopodia appear sometimes along the hyaline zone and trailing filaments at the posterior end; central cytoplasma hump usually contains some relatively large crystals; some species form cysts. About twenty species have been described. Species are reported from freshwater, marine and brackish habitats.
Below some microscales, all after Kudryavtsev (2006):

Cochliopodium tectal scale

Cochliopodium tectal scale
Cochliopodium tectal scale
Cochliopodium tectal scale
C. maeoticum, C. kieliense, C. minus and C. minutoidum

 

Remarks: Species can only be distinguished with certainty with an electron microscope, as the shape of the microscales is an important key characteristic.

 

Cochliopodium cf bilimbosum
Cochliopodium cf bilimbosum, with many crystals
Cochliopodium spec, Phase contrast, Florida
Cochliopodium spec.
Cochliopodium
Cochliopodium
The same specimen in DIC and Phase contrast (right), about 56 µm in diameter.
Cochliopodium division
Cochliopodium division
Cochliopodium division
Cochliopodium division
Division of Cochliopodium species.
Cochliopodium bilimbosum
Cochliopodium bilimbosum
Cochliopodium
Cochliopodium
Cochliopodium spec. with granular nucleolus

 

Literature:

Kudryavtsev 1999, 1999a, 2000, 2004, 2004a, 2005, 2005a, 2006, 2006a, Page 1988, 1991.

Recent posts

Euglypha bryophila

Euglypha bryophila, after Brown, 1911 (L), from Ecuador (R) Euglypha bryophila  Brown, 1911 Diagnosis: (Original description) The test is very regular in form and subject

Read More »

Vernalophrys

(A) A Scenedesmus cell (arrow) is engulfed by a trophozoite. (B) Several Scenedesmus cells adhere to the surface of a plasmodium that has numerous vacuoles

Read More »

Actinosphaeridium spec.

Actinosphaeridium spec. Diagnosis: Cell surrounded by a membranous shell, with an outer mucous layer. Filopodia with granules, sometimes branching. Cell stalked. Ecology: I found this

Read More »

Euglyphidion

Euglyphidion enigmaticum – after Bonnet, 1960 Genus Euglyphidion Bonnet, 196 Diagnosis: Shell hyaline, ovoid, pseudostome circular or slightly elliptical. Shell loosely covered with two types of

Read More »

Leptomyxa spec.

Leptomyxa sp., slowly retracting in response to the light of the microscope Leptomyxa sp. Diagnose: This is a very large amoeba which I found in

Read More »

Zivkovicia spec.

Zivkovicia spec., 200 µm long; the right image is viewed through the aperture Zivkovicia spec.  Diagnosis: Shell pyriform, circular in oral view, with a clear

Read More »