Glaeseria

Glaeseria Volkonsky, 1931 (ref. ID; 4891, 7755)

Tubulinea: Order Tubulinida (ref. ID; 6789)
Family Hartmannellidae (ref. ID; 7755)

[ref. ID; 4891]
Within family Hartmannellidae (Volkonsky, 1931) Page, 1974 it cannot be assigned to the genus Glaeseria due to the absence of nuclear division in cysts. (ref. ID; 4891)

Glaeseria mira (Glaser, 1912) (ref. ID; 7755)

Glaeseria mira (Glaser, 1912) (ref. ID; 7755)

Notes

This species, described by Glaser (1912) from southern Germany, has been isolated from three locations in or near Cambridge (Page 1974). Unfortunately, the only one of these isolated no remaining no longer forms abundant cysts, so that only the amoeboid stage has been examined with the electron microscope. An electron microscopic investigation of the processes in pre-cystic stages and cysts reported by Glaser must therefore be deferred. The nucleus had no inner fibrous lamina. The nucelolus often contained one or more lacunae. No distinct paranucleolar body was found; any inclusions next to the nucleolus were less dense and smaller than the paranuleolar bodies of H. cantabrigiensis and C. limacoides. On the surface of the amoeba were cup-like structures less than 30 nm in diameter and about 7.5 nm high above the plasma membrane. The mitochondria were oval or elliptical, never elongate. Their length was usually 0.9-1.2 um, with a maximum of 1.4 um. The cristae were tubular, seldom branching, with a diameter of 40 nm. The dictyosomes, composed of three or four, sometimes five or six, flattened saccules, were often biconcave or concave/convex, with a maximum diameter of 0.8 um. They sometimes occurred in pairs. Much but not all of the rough endoplasmic reticulum occurred as long, flattened tracts, which were more conspicuous than in the other hartmannellids except H. vermiformis. These amoebae contained no endocytic bacteria and no optically active inclusions. (ref. ID; 7755)

Examined materials

CCAP 1531/1, freshwater, England (strain 130 of Page, 1974). (ref. ID; 7755)