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The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Hyalosphenia

Hyalosphenia Stein, 1857 (ref. ID; 3693) or 1859 (ref. ID; 3686)

Amoebozoa: Order Arcellinida: Family Hyalospheniidae (ref. ID; 6728)
Rhizopoda (ref. ID; 2862, 4863)

[ref. ID; 1618]
Test ovoid or pyriform; aperture end convex; homogeneous and hyaline, mostly compressed; crown uniformly arched; protoplasm partly filling the test; several blunt pseudopodia simple or digitate. (ref. ID; 1618)

[ref. ID; 1923]
Scales indistinct, membrane seeming structureless. (ref. ID; 1923)

[ref. ID; 3686]
Shell colourless, yellow or brown; ovoid or pyriform; composed of proteinaceous material; aperture terminal, oval. (ref. ID; 3686)
  1. Hyalosphenia cuneata Stein, 1857 (ref. ID; 1923, 2038, 2109, 2114 figure, 2236, 2423, 2425, 2435, 3693)
    Syn; Difflugia ligata Tatem, 1870 (ref. ID; 1316, 3693); Hyalosphenia lata F.E. Schulze (ref. ID; 3693)
  2. Hyalosphenia elegans Leidy, 1879 (ref. ID; 1923, 2068, 2441, 2498) or 1875 (ref. ID; 2379) reported year? (ref. ID; 3283, 3693) reported author and year? (ref. ID; 6728)
  3. Hyalosphenia humicola Decloitre (ref. ID; 2512)
  4. Hyalosphenia inconspicua West (ref. ID; 3595)
  5. Hyalosphenia insecta Harnisch, 1938 (ref. ID; 2068, 2110, 2160, 2379)
  6. Hyalosphenia lata F.E. Schulze
    See; Hyalosphenia cuneata (ref. ID; 3693)
  7. Hyalosphenia minuta Cash, 1891 (ref. ID; 2066, 2160, 2235, 2236) reported year? (ref. ID; 3595)
  8. Hyalosphenia nobilis Cash, 1908 (ref. ID; 2122)
    See; Nebela nobilis (ref. ID; 2122)
  9. Hyalosphenia obliqua Decloitre (ref. ID; 2524 original paper)
  10. Hyalosphenia ovalis Wailes, 1912 (ref. ID; 2379)
  11. Hyalosphenia papilio Leidy, 1875 (ref. ID; 2379, 3686, 4863, 6790) or 1879 (ref. ID; 1618, 1923, 2058, 2242, 2257, 2441, 2490, 2498) reported year? (ref. ID; 3190, 3283, 3693) reported author and year? (ref. ID; 6728)
  12. Hyalosphenia planctonica (Minkiewicz, 1900) Chardez, 1987 (ref. ID; 3563 redescribed paper)
    Syn; Difflugia planctonica Minkiewicz, 1900 (ref. ID; 3563)
  13. Hyalosphenia punctata Penard (ref. ID; 3693)
  14. Hyalosphenia savoiei Chardez, 1978 (ref. ID; 3519)
  15. Hyalosphenia Schoutedei Van Oye (ref. ID; 2235)
  16. Hyalosphenia Schoutedei var. rotunda Van Oye, 1957 (ref. ID; 2235 original paper)
  17. Hyalosphenia schoutedeni Van Oye (ref. ID; 3595)
  18. Hyalosphenia subflava Cash, 1909 (ref. ID; 2862, 4737, 5461) reported year? (ref. ID; 2160, 2242, 2301, 2410, 2456) or Cash & Hopkinson, 1909 (ref. ID; 3686, 4755)
  19. Hyalosphenia tincta Leidy, 1879 (ref. ID; 2037) reported year? (ref. ID; 3693)
    See; Nebela bursella (ref. ID; 3693), Nebela tincta (ref. ID; 2037)
  20. Hyalosphenia undans (ref. ID; 2410)

Hyalosphenia cuneata Stein, 1857 (ref. ID; 1923, 2038, 2109, 2114 figure, 2236, 2423, 2425, 2435, 3693)

Synonym

Difflugia ligata Tatem, 1870 (ref. ID; 1316, 3693); Hyalosphenia lata F.E. Schulze (ref. ID; 3693)

Descriptions

Shell exceedingly transparent, without pores through the fundus. Shell shorter and broader than H. elegans, greatly compressed, colourless. Without zoochlorellae. A rare species. Habitat clear water and among Sphagnum. (ref. ID; 1923)

Measurements

Length 60-75 um. (ref. ID; 1923)

Hyalosphenia elegans Leidy, 1879 (ref. ID; 1923, 2068, 2441, 2498) or 1875 (ref. ID; 2379) reported year? (ref. ID; 3283, 3693) reported author and year? (ref. ID; 6728)

Descriptions

Surface of shell with undulations. Shell flask-shaped, compressed, brownish or yellowish in color, very transparent. Two minute pores, opposite each other, are in the base of the neck. Nucleus single. Pseudopods few. Habitat bogs among Sphagnum and moss. (ref. ID; 1923)

Measurements

Length 75-100 um. (ref. ID; 1923)
Shell dimensions (n=10): length 99+/-6 um, breadth 51+/-4 um. (ref. ID; 6728)

Hyalosphenia papilio Leidy, 1875 (ref. ID; 2379, 3686, 4863, 6790) or 1879 (ref. ID; 1618, 1923, 2058, 2242, 2257, 2441, 2490, 2498) reported year? (ref. ID; 3190, 3283, 3693) reported author and year? (ref. ID; 6728)

Descriptions

Test yellowish; transparent; pyriform or oblong in front view; a minute pore on each side of crown and sometimes one also in center; aperture convex; in narrow lateral view, elongate pyriform, aperture a shallow notch; with chlorophyllous particles and oil globules; in fresh water among vegetation. (ref. ID; 1618)
Shell ovoid or pyriform, compressed, yellowish in color. Protoplasm not filling the shell but attached to the inner surface by threads (epipodia) always containing chlorellae. Pseudopods often numerous active. Generally 2, but sometimes 4 to 6 pores about the borders of the fundus. Habitat Sphagnum; common in swamps. (ref. ID; 1923)
The shell is colourless or yellow, ovoid, smooth and laterally flattened. A lateral pore is present, at about the mid-body region, on each side. The aperture is terminal and surrounded by a small collar. Two forms of this species have been described and listed by Grospietsch (1965) in his review of the genus, which are characterized by either having several pores or a concave aperture. (ref. ID; 3686)
The shell is completely organic, transparent, almost colourless to light-yellow. It is ovoid and strongly flattened in broad lateral view. In some shells, a poorly defined pleat may exist along the lateral edges of the shell. A pore is present on each lateral edge in the upper third of the shell. All of our material contained a maximum of two pores on each shell. In lateral view, the transition to the pseudostome is gradual. Pseudostome is a narrow slit and concave in apertural view, surrounded by a narrow organic collar. Difference in shell length and pseudostome diameter has been shown to be statistically significant. Results of the correspondence analysis and scatter diagram indicate, however, that, as in Nebela militaris, both populations are similar. (ref. ID; 4863)
Shell composition is secreted proteinaeous; position of aperture is terminal. (ref. ID; 6790)

Measurements

Length 110-140 um. (ref. ID; 1618, 1923)
Length of shell 111-133; breadth of shell 81-91; depth of shell 21-25; diameter of aperture 32-40 um (n=3). (ref. ID; 3686)
Shell dimensions (n=10): length 123+/-9 um, breadth 75+/-17 um. (ref. ID; 6728)
Shell dimensions (um): length 90-175, breadth 60-115, depth 21-25, diameter of aperture 32-40. (ref. ID; 6790)

Hyalosphenia subflava Cash, 1909 (ref. ID; 2862, 4737, 5461) reported year? (ref. ID; 2160, 2242, 2301, 2410, 2456) or Cash & Hopkinson, 1909 (ref. ID; 3686, 4755)

Descriptions

The shell is colourless or yellow, ovoid and smooth. It is elliptical in narrow view and oval in apertural view. The aperture is terminal, oval or circular. Cash & Hopkinson (1909) described several variations of shape from different samples in Britain, and noted that when the shell had a uniform outline the aperture was often difficult to see. (ref. ID; 3686)
Shell ovoid, smooth, yellowish, compressed. Aperture elliptic with a thickened border. The apical porus which is described by Cash and Hopkinson (1909) and Grospietsch (1965) could not be found by us and Wanner (1987). Likewise, Ogden and Hedley (1980) do not mention such structure. (ref. ID; 4755)

Measurements

Length of shell 56-62; breadth of shell 37-38; depth of shell 24-25; diameter of aperture 13-14 um (n=2). (ref. ID; 3686)