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The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Cashia

Cashia Page, 1971 (ref. ID; 4891)

Amoebida: Hartmannellidae (ref. ID; 7567)
Hartmannellidae (ref. ID; 7755)
  1. Cashia limacoides (Page, 1967) (ref. ID; 7755) reported author and year? (ref. ID; 4891)
    Syn; Hartmannella limacoides Page, 1967 (ref. ID; 7755)
  2. Cashia mycophaga Pussard, Alabouvette, Lemaitre & Pons, 1980 (ref. ID; 7567 original paper)

Cashia limacoides (Page, 1967) (ref. ID; 7755) reported author and year? (ref. ID; 4891)

Synonym

Hartmannella limacoides Page, 1967 (ref. ID; 7755)

Notes

This little, slowly multiplying amoeba (7.5-25.5 um long), first described as Hartmannella limacoides from a small lake in Alabama, USA (Page 1967), has been reported by Cerva (1971) from the swimming pools at Usti nad Labem, Czechoslovakia, and by Cerva and Huldt (1974) from swimming pools in Stockholm. It small size, paucity of distinguishing light microscopic characters, and lack of any known cyst would seem to make identifications difficult and the groups for erection of a new genus for this species (Page 1974) tenuous. However, the electron microscopic observations both supported its position in the Hartmannellidae and revealed distinctive characters. The nucleus had no inner fibrous lamina. Like that of H. cantabrigiensis, it contained a paranucleolar body. The surface structures, somewhat faint in the preparations, were distinctly sucker-like elements 30 nm wide or slightly wider and approximately 15 nm high above the plasma membrane. They appeared more widely separated that the similar but smaller elements on Hartmannella spp. The mitochondria were oval to elliptical in profile; no elongate ones were seen, the maximum length was 1.1 um. The tubular cristae, which seldom if ever branched and had a diameter of about 50-60 nm, were helical, a shape hitherto unknown in gymnamoebae. (The narrower helical structures found by Dykstra (1977) in the mitochodria of an acrasid apparently were not cristae). Golgi bodies were flat or biconcave, consisting of three to five (often four) flattened sacs. These dictyosomes, with a maximum width of 0.7 um, often occurred in pairs, the two members of which might be at right angles to each other. The rough endoplasmic reticulum appeared always to be in the form of small vesicles. No endocytic bacteria were found, and no optically active inclusions were seen with the light microscope. During nearly 20 years in culture, this strain has never formed cysts. (ref. ID; 7755)

Examined materials

CCAP 1534/5, freshwater, USA (strain 44 of Page 1967). (ref. ID; 7755)