IUCN threat status:

Not evaluated

Comprehensive Description

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Description of Oltmannsiellopsis

Cells solitary or colonial, when colonial mostly with 2 or 4 cells joined laterally in linear arrangement; cell shape ovoid, ellipsoidal, cordate, dorsiventrally flattened, sometimes bent longitudinally and asymmetrical; broader anteriorly, with shallow apical depression, narrower posteriorly; cell wall absent, but cells embedded in a gelatinous matrix; 4 equal flagella, arranged in two oppositely oriented pairs; basal bodies in zig-zag row; chloroplast single, cup-shaped with two to four lobes; single pyrenoid, basally located, traversed by thylakoids and surrounded by a continuous sheath of starch grains; eyespot present, anteriorly or posteriorly located, consisting of a single plate of eyespot lipid globules; nucleus centrally located; Golgi bodies anteriorly located, between nucleus and flagellar bases; muciferous bodies present; a single microbody, located between nucleus and pyrenoid; contractile vacuoles absent(?); asexual reproduction by longitudinal division of vegetative flagellate cells, in colonial taxa the colony first splits into half (either two cells or single cells), each cell then divides longitudinally to reconstitute the colony; sexual reproduction and resting stages unknown; habitat coastal marine and brackish water.

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