Microworld

world of amoeboid organisms

Menu
Sphenoderia species A S. macrolepis; B S. lenta; C S. valdiviana; D S. pseudominuta; E S. minuta (from Chatelain et al, 2013)

Genus Sphenoderia Schlumberger, 1845

Diagnosis: test clear, circular or ovoid, covered with overlapping elliptical or nearly circular scales. Pseudostome circular or a narrow, oval slit at the end of a broad, clear collar covered with numerous small plates. Nucleus spherical, with few small nucleoli.

Scales of one or more types on the core of the shell, pseudostome slit-like, mostly surrounded by a collar that comprises small scales that can be sometimes invaginated (S. sphaerica). Round or oval cross section (e.g.S. compressa, S. labiata). Occurs from aquatic (S. compressa, S. lenta var. longicollis) to litter and moss environments.

Type species: Sphenoderia lenta.

Other species:
S. splendida
S. foveosa
S. australis
S. longicollis
S. minuta
S. labiata
S. macrolepis
S. ovoidea
S. compressa
S. sphaerica
S. fissirostris
S. valdiviana
S. pseudominuta

 

Sphenoderia lenta
Sphenoderia lenta in division
Recent posts

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 »

Zivkovicia compressoidea

Z. compressoidea, a-b after Chardez, 1958; c after Jung, 1942 Zivkovicia compressoidea  (Jung, 1942) new.comb. Basionym: Pontigulasia compressoidea Jung, 1942 Diagnosis: Shell ovoid and compressed,

Read More »

Zivkovicia flexa

Z. flexa, from Cash and Hopkinson, 1909 Zivkovicia flexa  (Cash and Hopkinson, 1909) Ogden, 1983 Basionym: Pontigulasia compressa var. flexa  Cash and Hopkinson, 1909 Diagnosis:

Read More »