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Ancient Eukaryotes? Taxonomy and Biology of "Excavate" Protists |
In this key, the genus Reclinomonas is treated as monotypic; Histiona campanula, transferred to Reclinomonas by Flavin and Nerad (Flavin and Nerad 1993), is here retained in Histiona pending rediscovery of this species and further work on the group as a whole. |
| 1. Lorica present; freshwater species | Histionidae; 2. |
| 1. Lorica absent; freshwater or marine | 5. |
| 2. Lorica with spine scales; right margin of ventral groove not extending beyond the lorica margin at the posterior end of the cell | Reclinomonas americana Flavin & Nerad |
| 2. Lorica lacking spine scales (or nature of covering unknown); right margin of ventral groove capable of extending well beyond the lorica margin at the posterior end of the cell | Histiona; 3. |
| 3. Lorica stipitate (differentiated into bell and stipe) | 4. |
| 3. Lorica narrow, cone- or funnel-shaped, not stipitate | H. velifera (Voigt) |
| 4. Lorica obviously laterally flattened, bent ("nodding") near the junction of bell and stipe | H. campanula Penard |
| 4. Lorica bell-shaped, less conspicuously flattened, bell erect on stipe | H. aroides Pascher |
| 5. Freshwater; posterior flagellar vane originating on ventral side of flagellum; mitochondrion mostly posterior to nucleus, with discoidal cristae; cysts known | Malawimonadidae; Malawimonas jakobiformis O'Kelly & Nerad |
| 5. Marine; posterior flagellar vane originating on dorsal side of flagellum; mitochondrion surrounding nucleus, with irregularly flattened cristae; cysts unknown | Jakobidae; Jakoba libera (Ruinen) |
| Last Update 21 January 2000 |