Aphanocapsa sp.
Key to families
- Cells solitary or forming irregular, flat or spherical mucilaginous colonies, cell division in two planes in successive generations ... Merismopediaceae (Genera included in this volume: Aphanocapsa, Coelosphaerium, Gomphosphaeria, Merismopedia, Pannus, Snowella, Synechocystis, Woronichinia)
Key to genera
1. Cells solitary ........................................................................................................................................... Synechocystis
- Cells in various colonial arrangements ........................................................................................................................2
2. Cells arranged at the periphery of the colony.................................................................................................... Pannus
- Cells regularly or irregularly arranged throughout the colony.....................................................................................3
3. Colonies amorphous, irregular with cells irregularly arranged ...............................................................Aphanocapsa
- Colonies plate-like with cells in regular tabular arrangement ................................................................Merismopedia
Key to species:
1. Colonies planktonic .................................................................................................................................................... 2
- Colonies epiphytic metaphytic, or benthic, non-planktonic.........................................................................................8
2. Cells densely arranged in colonies............................................................................................................................... 3
- Cells loosely arranged in colonies, space between adjacent cells > 1–2 cell diameters ..............................................5
3. Cells < 2 μm in diameter .............................................................................................................................................4
- Cells generally densely and evenly spaced, spherical pale blue-green, 2.2–3.1 (–3.5) μm in diameter......A. annulata
4. Colonies irregularly spherical in younger colonies, later irregular, lobate, elongate or clathrate; cells 0.8–1.2 μm in diameter .......................................................................................................................................................A. holsatica
- Colonies spherical, rarely irregular; cells 0.8–1.5 (–1.9) μm in diameter..................................................... A. incerta
5. Cells < 2 μm in diameter..............................................................................................................................................6
- Cells > 2 μm in diameter............................................................................................................................................. 7
6. Colonies regularly spherical to elliptical, often irregular in older colonies; cells 0.5–1.0 (–1.3) μm in diameter......... ..............................................................................................................................................................
A. delicatissima
- Colonies spherical to irregularly cloud-like, 1.2–1.8 μm in diameter..........................................................A. nubilum
7. Colonies regularly spherical to oval, cells 1.3–2.3 μm in diameter.............................................................A. elachista
- Colonies spherical or irregularly spherical; cells 2.0–2.8 (–3) μm in diameter ........................................A. koordersii
8. Cells densely arranged in colonies............................................................................................................................... 9
- Cells widely and evenly spaced, distance between cells 2 to 4 times the cell diameter; cells 2.9–3.8 μm in diameter;
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A. sp. A
9. Colonies ± composed of subcolonies, mucilaginous; cells spherical or slightly oval, 3.5–6.0 μm in diameter............
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A. cf. grevillei
- Colonies ± spherical, or irregularly sub-spherical, often composed, mucilage distinctly delimited; cells spherical, (2.8–) 3.0–5.0 μm in diameter .......................................................................................................................A litoralis
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