Oral extremity broad. Shell in broad view of nearly uniform width, with semicircular extremities; body scales circular, imbricated. Aperture circular, oblique, invaginated, seeming oval in front view. Habitat mosses and Sphagnum. (ref. ID; 1923)
Shell ovoid in ventral view, slightly compressed, composed of circular idiosomes of different size. Aperture oval, slightly invaginated. Nucleus with a central nucleolus. (ref. ID; 4755)
The varieties of the soil-inhabiting T. complanatum Penard, 1890 are shown to be adaptive morphos of an extreme polymorphism. (ref. ID; 4821)
One to two contractile vacuoles; pseudopodia attenuate, radiating. (ref. ID; 1618)
Shell of large size with distinct plates, oviform, compressed anteriorly. Body scales circular. Aperture circular, oblique, invaginated, and surrounded by a number of rows of very minute scales. Pseudopodia few, fine, and long. Habitat mosses, Sphagnum and aquatic vegetation; common. (ref. ID; 1923)
The shell is ovoid and flattened slightly in the apertural region. It is composed of approximately fifty, large, circular, incompletely overlapping shell-plates and an unknown number of smaller, oval, shell-plates. The aperture is circular, sub-terminal and invaginated. It is bordered by an inner circle of about forty denticulate apertural-plates, and two or three rows of small, oval, shell-plates. Each apertural-plate is circular, and carries a median, dorsal tooth. Both Chardez (1956) and Thomas (1958) have shown the differences in shape and size of the shell of this species. (ref. ID; 3686)
Shell elliptic, oval in transverse section. Aperture circular, invaginated, toothed. Distinction between T. enchelys and the very similar T. lineare only by their size. (ref. ID; 4755)
Measurements
30-100 um long; 15-60 um wide; scales 4-12 um in diameter. (ref. ID; 1618)
Length 40-100 um. (ref. ID; 1923)
Length 32-42 um. (ref. ID; 2356)
Shell length 47-78, width 19-34; diameter of aperture 11-20; diameter of large shell-plates 5.6-10.3, diameter of small shell-plates 1.9-4.3; diameter of apertural plates 0.9-1.8 um (n=13). (ref. ID; 3686)
Test transparent; scales indistinct; filopodia. (ref. ID; 1618)
Shell of small size, plates indistinct. Usually the plates are distinguishable only about the edges where they may appear as minute undulations. Aperture round. Habitat mosses, Sphagnum, aquatic vegetation, moistened soils. Generally distributed and apparently the commonest form of all Rhizopoda. (ref. ID; 1923)
The shell is composed of approximately fifty, large, circular, incompletely overlapping, shell-plates, and an unknown number of small, oval to circular, shell-plates which either haphazardly fill the interstices or are completely overlaid by the large shell-plates. The aperture is normally circular, invaginated and situated sub-terminally. It is bordered by an inner circle of from 18 to 28 small, denticulate apertural-plates and one or two rows of small shell-plates. The apertural-plates may occasionally be moved from their marginal position to form double rows, or to be displaced out of symmetry. (ref. ID; 3686)
Shell elliptic, oval in transverse section. Shell platelets hardly seen in vivo, but distinct after silver-staining. Aperture circular, invaginated, toothed. Individuals with an evaginated aperture, as described by Meisterfeld (1979), have never been observed. Nucleus with a central nucleolus. (ref. ID; 4755)
Comments
Cash et al. (1915), Chardez (1956, 1970) and Thomas (1958) have illustrated variation in the position of the aperture, including examples of evaginated apertures. Whilst, in clonal cultures several abnormal forms have been observed (Hedley and Ogden 1974). (ref. ID; 3686)
Measurements
About 35 um by 17 um. (ref. ID; 1618)
Length 16-30 um. (ref. ID; 1923)
The length of the test was 22 um, the width was 11 um and the pseudostome had a diameter of 6 um. (ref. ID; 2683)
30-37x14 um. (ref. ID; 3342)
Trinema lineare Penard var. minuscula Chardez, 1968 (ref. ID; 2144, 2146, 2449, 2456) or 1971 (ref. ID; 650, 4860)
Descriptions
This variety is a size variety of Trinema lineare. The shell of this variety is smaller than that of Trinema lineare. Otherwise shells in shape and in surface structure in accord with Trinema lineare. A variety which lives in aerophytical mosses, in soil and in sea interstitial. (ref. ID; 4860)
Measurements
Length of the shell 17-21 (19+/-2), diameter of the shell 5-8 (6.5+/-1.5), aperture of the shell 3-5 (4+/-1) um (n=156). (ref. ID; 4860)
Shell composed of two independent parts. Outer component carries the circular shell platelets, inner part forms the oval aperture. In contrast to the very similar T. galeata, the inner shell does not form an anterior apertural rim. (ref. ID; 4755)
Measurements
Thomas and Chardez (1958) give a size of 42-55x20-30x14-20 um, and a major axis of the aperture of 10-15 um. The measurement of our population vary in a wider range (for example length 30-65 um), and only the character "diameter of idiosomes" has a V<10. (ref. ID; 4755)
