The genus Korotnevella Goodkov, 1988, was described in 1988 by the Russian protistologist A. V. Goodkov. The type species designated by Goodkov, K. riparia (Page, 1972) Goodkov, 1988, was described, as Mayorella riparia Page, 1972, in English freshwaters. Korotnevella riparia is, at present, considered to be the same species as K. stella (Schaeffer, 1926) Goodkov, 1988. When two or more names exist for a single species, the oldest one is used. So, today, the type species of Korotnevella is considered to be K. stella.
Additional species of Korotnevella Goodkov:
The structure and distribution of the scales in K. diskophora and K. nivo are quite different from the other Korotnevella species. It may prove that these species are better placed in other genera. Indeed, scales on the surface of K. nivo are identical in type, size, distribution, and structure to those of Paramoeba eilhardi, the type species of Paramoeba. The two species differ only in that K. nivo lacks a parasome, while P. eilhardi has one. The two "species" may be one and the same - a finding that would have implications for the biology, and the taxonomic meaning, of the parasome.
As yet there is no gene sequence information available to help identify species or test species concepts. The species diversity in this genus is probably underrepresented.
Key to the species of scale-bearing dactylopodiate amoebae (from O'Kelly et al. 2001, slightly modified)
| 1. Scales not basket-shaped; cells with only one type of scale | 2. |
| 1. Basket-shaped scales present; cells usually bearing two types of scales | 4. |
| 2 (from 1). Scales oval or disk-shaped, with a central spine, overlapping; freshwater; locomotive amoebae to 25 micrometres long |
Korotnevella
diskophora
Smirnov, 1999 (= K. discophora) |
| 2. Scales crown-shaped, with 6-14 vertical columns supporting an unornamented rim | 3. |
| 3 (from 2). Parasome present | Paramoeba eilhardi Schaudinn, 1896. |
| 3. Parasome absent | K. nivo Smirnov, 1996-97 |
| 4 (from 1). Basket scales with six, full vertical columns supporting the rim and six half-columns supporting an intermediate crosspiece; rim narrow, minutely fenestrate; locomontive amoebae rarely more than 35 micrometres in length; brackish/marine | K. hemistylolepis O'Kelly, Peglar & Nerad in O'Kelly et al. 2001 |
| 4. Basket scales lacking half columns and with more ornate rims; locomotive amoebae generally longer than 40 micrometres | 5. |
| 5 (from 4). Basket scales with obvious vertical columns arising from the basal plate, supporting a broad rim, and usually bearing at least one conspicuous spine | 6. |
| 5. Basket scales without obvious vertical columns and spines | 7. |
| 6 (from 5). Basket scales with one spine or none; columns attached only to the basal crosspiece of the rim; rim lattice elements triangular or pentangular; nucleolus generally intact; brackish/marine | K. monacantholepis O'Kelly, Peglar & Nerad in O'Kelly et al. 2001 |
| 6. Basket scales with two spines, one at each end of the rim; columns sometimes attached to the middle crosspiece of the rim; rim lattice elements quadrangular; nucleolus fragmented; freshwater | K. bulla (Schaeffer, 1926) Goodkov, 1988 |
| 7 (from 5). Rim margin convex; small scales unknown; marine | K. sp. ("Mayorella sp. 1" of Pennick & Goodfellow 1975) |
| 7. Rim margin concave; lattice element suspended just above the scale base; freshwater | K. stella (Schaeffer, 1926) Goodkov, 1988 |
For information on the classification of Korotnevella, see the Classification page.
For lookalike taxa see Similar genera.
Korotnevella: Index | Introduction | Appearance | Ultrastructure | Reproduction and Life History | Similar genera | Classification | Taxonomy and Nomenclature | Cultures | References | Internet resources
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