Microworld

world of amoeboid organisms

Menu
Difflugia scalpellum
 
Difflugia cf scalpellum (from China, length 212-242 µm)

 

Difflugia scalpellum Penard, 1899

Diagnosis: Shell bilateral symmetrical, cylindrical, gradually swelling from the aperture for about two-thirds of the body length to the broadest diameter and then tapering in the last third of the body length to a bluntly or sharply, asymmetrically shaped apex. Test composed of quartz particles and diatom frustules, giving it the appearance of a regular smooth surface. Aperture usually circular. Nucleus vesicular with central nucleolus.

Dimensions: Penard: length mean 220-300 µm; my measurements: 212-242 µm.

Ecology: in oligotrophic and mesotrophic ponds, between sphagnum; rare.

Remarks: this species was described and pictured by Ogden as Difflugia venusta Penard 1902, but his photomicrographs are quite different from Penards drawing and description.

Difflugia scalpellum
These shells were prepared by Penard and labeled as “Difflugia scalpellum” (image from Mazei and Warren, 1912).
Difflugia scalpellum
D. calpellum“, Pénard Collection, Geneva – Photograph by Thierry Arnet, as part of the Pénard project. The red color is borax-carmine.
Difflugia scalpellum
 
Difflugia scalpellum (from Penard, 1902)

 

Difflugia scalpellum
From China
Difflugia scalpellum
I have identified these shells as D. smilion, but the drawing to the left is from Penard and shows D. scalpellum.

   

Recent posts

Reticulomyxa hannae

R. hannae, plasmodium – photomicrograph Steffen Clauß Reticulomyxa hannae Völcker and Clauß, 2020 Diagnosis: Trophozoites surrounded by a very thin mucous envelope, with slowly moving plasmodia, variable

Read More »

Velamentofex

Velamentofex tyrolensis (photomicrograph Steffen Clauß) Family Velamentofexidae Völcker and Clauß, 2020 Diagnosis: Multinucleate organic-walled monothalamous foraminifera. Test spherical to pyriform, usually surrounded by a broad

Read More »

Claparedellus lachmannii

Claparedellus lachmannii, common shape (Riedensee) Claparedellus lachmannii  Khanipour Roshan and Clauß, 2020 Diagnosis: Multinucleate organic-walled monothalamous foraminifera. Test spherical to elongated pyriform or irregularly shaped, with a

Read More »

Claparedellus

Claparedellus lachmannii Genus Claparedellus Khanipour Roshan and Clauß, 2020 Diagnosis: Multinucleate organic-walled monothalamous foraminifera. Test spherical to elongated pyriform or irregularly shaped, with a hyaline, flexible,

Read More »

Velamentofex tyrolensis

V. tyrolensis (photomicrograph Steffen Clauß) Velamentofex tyrolensis Völcker and Clauß, 2020 Diagnosis: Trophozoites ovoid, 98-125 μm, with reticulopodia up to 300 μm long, with a hyaline,

Read More »

Velamentofex saxonensis

V. saxonensis, feeding (photomicrograph Steffen Clauß) Velamentofex saxonensis Völcker and Clauß, 2020 Diagnosis: Trophozoites ovoid, 30-95 μm, granuloreticulopodia up to 1000 μm long. with a hyaline, thin

Read More »