Characiellopsis is a genus of green algae in the family Characiaceae.

[1] Characiellopsis consists of solitary cells that are elongate and attached to a substrate via a pad of mucilage.

[2] Characiellopsis anophelesii consists of solitary cells that are attached to mosquito (Anopheles) larvae.

[2] Characiellopsis skujae consists of solitary cells that are elongated to ovoid, attached to a surface via a thick stalk.

The apical ring structure is very distinctive, and it shares this characteristic with another taxon, Characium obtusum; the two species are probably synonymous.