Microworld

world of amoeboid organisms

Menu
Hyalosphenia cuneata
Hyalosphenia cuneata
Hyalosphenia cuneata, Crailoo, 2018

Hyalosphenia cuneata Stein, 1857

Diagnosis: Shell exceedingly transparent, without any pores; shell shorter and broader than H. elegans, greatly compressed, with an indication of a broad rounded keel, colorless; without zoochlorellae; nucleus with some spherical nucleolar fragments.

Dimensions: Length in literature 60-75 µm; my measurements 52-67 µm. I found two specimens in one sample that measured 56.6 and 67.3 µm respectively.

Ecology: Freshwater; clear stagnant water and also among Sphagnum. I found this species in different water types, e.g. peat bogs, an isolated pond in a meadow, the sandy shore of a deep lake (Spiegelplas) and a mesotrophic pond (Crailoo).

Remarks: This species multiplied well in wet preparations kept in moist chambers .

Hyalosphenia cuneata
Hyalosphenia cuneata
p=pseudostomal edge
n=nucleus
Hyalosphenia cuneata
H. cuneata, Spiegelplas, 2019
Hyalosphenia cuneata
H. cuneata, pseudostomal region – Spiegelplas, 2019
Hyalosphenia cuneata
H. cuneata, optical cross-section – Spiegelplas, 2019
Hyalosphenia cuneata
H. cuneata, 58 µm
Hyalosphenia cuneata
Hyalosphenia cuneata
H. cuneata, 58 µm
Hyalosphenia cuneata
H. cuneata
Hyalosphenia cuneata
From Penard, 1902
Hyalosphenia cuneata
H. cuneata
Hyalosphenia cuneata
Hyalosphenia cuneata
Hyalosphenia cuneata
H. cuneata, Crailoo, 2018
Recent posts

Kibisidytes

K. marinus, after Jepps, 1934 Kibisidytes marinus Jepps, 1934 Diagnosis: Small amoeboid organism occurring in the sea, attached to the surface film or to some

Read More »

Phaeobola

P. aeris from Dumack et al., 2000 Phaeobola Dumack et al., 2000 Diagnosis: Cells roundish to oval shaped. Shell colorless to amber-colored, rough surface, few

Read More »

Rhizaspis armata

R. armata, 68 µm long, excl. spines – Laegieskamp Rhizaspis armata (Lauterborn, 1901) Dumack et al., 2021 Basionym: Pamphagus armatum Lauterborn, 1890 Diagnosis: Theca membranous,

Read More »

Rhizaspis spinosa

The original description with original drawings, Penard, 1890. Rhizaspis spinosa (Penard, 1890) Dumack et al., 2021 Basionym: Trinema spinosum Penard, 1890 Diagnosis: Theca membranous, ovoid

Read More »

Difflugia “pseudoclaviformis”

Difflugia “pseudoclaviformis”, front and side view, 424 µm Difflugia “pseudoclaviformis” Diagnosis: Shell pyriform, compressed, with a more or less pronounced aboral protuberance; shell composed of

Read More »

Difflugia from Lolo Pass

Shells 461-448 µm, stacked image. I found this large en remarkable shells in sediment of a small mountain lake near Lolo Pass, Montana USA. It differs

Read More »

Foraminifer drome

Unknown species, collected from the river Drôme, France, 2021 Unknown species September 2021, I found about ten specimens of an agglutinated foraminifer in a sample

Read More »

Cyclopyxis spec

Cyclopyxis spec., 168 µm Cyclopyxis spec. Diagnosis: Shell circular in ventral and dorsal view, more or less hemispherical in lateral view (height/diameter ≈ 0.5); lateral

Read More »

Difflugia fallax

Difflugia fallax, from Penard, 1902 Difflugia fallax Penard, 1890 Diagnosis: Shell hyaline or yellowish-greenish, black at low magnification, round in cross section, formed of a

Read More »