Main Content
< Top page

The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Sphenoderia

Sphenoderia Schlumberger, 1854 (ref. ID; 3686)

Rhizopoda: Testacea: Order Testaceafilosa De Saedeleer, 1934: Family Euglyphidae Wailes, 1919 (ref. ID; 7500)
Euglyphidae Wailes (ref. ID; 7501)

[ref. ID; 1618]
Test globular or oval, sometimes slightly compressed; hyaline, membranous, with a short broad neck, and a wide elliptical aperture; scales circular, oval, or hexagonal, arranged in alternating series; cytoplasm colorless; one to two contractile vacuoles; filopodia, fine branching; fresh water. (ref. ID; 1618)

[ref. ID; 1923]
Shell globular or ovoid, more or less compressed but always at least moderately so, with a distinct, hyaline neck. (ref. ID; 1923)

[ref. ID; 3686]
Shell colourless; ovoid or circular, oval or circular in transverse section; composed of oval or circular shell-plates; aperture lenticular with a small collar composed of smaller oval shell-plates. (ref. ID; 3686)
  1. Sphenoderia dentata Monier (ref. ID; 2329)
  2. Sphenoderia dentata Penard (ref. ID; 3693)
  3. Sphenoderia fissirostris Penard, 1890 (ref. ID; 2160, 2329, 2441) reported year? (ref. ID; 3693)
  4. Sphenoderia lenta Schlumberger, 1845 (ref. ID; 1618, 1923, 2329, 2330, 2356, 2411, 2441, 3223, 3686, 7500) reported year? (ref. ID; 3501, 3595, 3598, 3693) reported author and year? (ref. ID; 3173)
    Syn; Assulina lenta Ehrenberg, 1871 (ref. ID; 3693); Difflugia lenta Ehrenberg, 1871 (ref. ID; 3693); Euglypha globosa Carter (ref. ID; 3693)
  5. Sphenoderia macrolepis Leidy (ref. ID; 1923, 3693)
  6. Sphenoderia minuta Deflandre, 1931 (ref. ID; 2441) reported year? (ref. ID; 3595)
  7. Sphenoderia ovoidea Jung (ref. ID; 2456)
  8. Sphenoderia rhombophora Bonnet (ref. ID; 5092 original paper)
  9. Sphenoderia splendida (Playfair) Deflandre (ref. ID; 2081, 3595)
  10. Sphenoderia splendida var. longicollis Deflandre (ref. ID; 2081)
  11. Sphenoderia tracheleuglyphoides Chardez (ref. ID; 2457 original paper)
  12. Sphenoderia truncata Van Oye, 1949 (ref. ID; 3223 original paper)

Sphenoderia lenta Schlumberger, 1845 (ref. ID; 1618, 1923, 2329, 2330, 2356, 2411, 2441, 3223, 3686, 7500) reported year? (ref. ID; 3501, 3595, 3598, 3693) reported author and year? (ref. ID; 3173)

Synonym

Assulina lenta Ehrenberg, 1871 (ref. ID; 3693); Difflugia lenta Ehrenberg, 1871 (ref. ID; 3693); Euglypha globosa Carter (ref. ID; 3693)

Descriptions

Hyaline test ovoid or globular; scales circular or broadly oval; aperture terminal, surrounded by a thin chitinous collar, one side inclined inwards; nucleus large; cytoplasm colorless; two contractile vacuoles. (ref. ID; 1618)
With numerous small scales as in other Euglyphidae. Shell globular or ovoid. Body scales subcircular or broadly oval, regularly imbricated; aperture linear, formed by a thin chitinous collar which is constituted of minute scales very difficult to define. General outline and neck very variable. Possibly several species confused. Habitat; Sphagnum and submerged vegetation. (ref. ID; 1923)
The shell is usually circular and composed of approximately sixty circular shell-plates. The aperture is terminal, linear and is surrounded by an organic collar. The organic collar is covered with small, oval shell-plates, which appear to be randomly arranged and vary from 1.8 to 3.0 um in diameter. One lip of the collar is usually concave whilst the other lip is folded inwards. This folding makes it difficult to ascertain the correct shape of the apertural opening, but it is assumed that it is long and narrow with semicircular ends. Differences in the shape and size of the shell-plates and the apertural collar were described by Cash et al. (1915). (ref. ID; 3686)

Measurements

30-64 by 20-46 um; aperture 10-22 um in diameter. (ref. ID; 1618)
Length 30-64 um. (ref. ID; 1923)
The shell length was 35 um, and the individual plates were 10 um long. (ref. ID; 2356)
Shell length 47-55, width 35-40; diameter of aperture 16-19; shell-plates diameter 10-12.4 um. (ref. ID; 3686)

Sphenoderia macrolepis Leidy (ref. ID; 1923, 3693)

Descriptions

With a pair of large plates on each side and a number of other smaller plates. Shell small, oviform; the 2 large plates are elliptic and transversally disposed; aperture linear, neck conical in side view. Habitat Sphagnum. Not common, but a very distinct and pretty species. (ref. ID; 1923)

Measurements

Length 27-45 um. (ref. ID; 1923)