Crucigeniella is a synonym (Guiry et al. 2011).
Members of this genus were separated from Scenedesmus based on genetic analysis (Guiry et al. 2010), but morphologically, they often have spines and/or a cell wall with ridges, warts, or nets (Wehr and Sheath 2003).
Ankistrodesmus falcatus var. acicularis is a synonym of Monoraphidium griffithii (Guiry et al. 2010).
| 1. Monoraphidium
griffithii |
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Keweenaw Waterway at MTU aquatic plant sample 5/1/03 7°C |
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| 2. Monoraphidium
griffithii |
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Seneca Creek at Cliff Dr aquatic plant sample 5/31/10 |
| 1. Quadrigula |
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Arnheim Sloughs site #1 plant detritus sample 10/20/05 14°C |
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| 2. Quadrigula |
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Thirteen Mile Lake plankton tow 6/17/10 pH 5.7, 22°C, 17 uS |
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| 3. Quadrigula |
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same as above |
| 1. Tetradesmus
wisconsinensis |
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Gratiot River, riffle below falls filamentous algae sample 8/8/03 |