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Hemistasia (hem-is-stays-ee-a) is one of a small number of genera that make up the diplonemids, a subset of euglenozoa. Although not widely reported, they are often encountered in especially marine habitats where they consume detritus, algae, and other moderately sized particles. They have two flagella which insert into a shallow subapical pocket. There are three genera which look similar: Rhynchopus with a papillum and relatively deep flagellar pocket, Diplonema with two short flagella, and Hemistasia with long flagella. The species are polymorphic, making species and generic boundaries very hard to establish. Because of the absence of the papilla, and the long flagella, we have tentatively assigned this to Hemistasia. With slightly thickened flagella (like most euglenozoa), metaboly (like euglenids) but not with a pellicle of interlocking strips. Common but not often reported. Phase contrast.
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Hemistasia (hem-ee-stays-ee-a), one of the diplonemid flagellates. With thickened flagella (like most euglenozoa), metaboly (like euglenids) but not with the pellicle. This genus also has a spiral groove on the surface of the body. Common but not often reported. There are three genera which look similar: Rhynchopus with a papillum and relatively deep flagellar pocket, Diplonema with two short flagella, and Hemistasia with long flagella. The species are polymorphic, making species and generic boundaries very hard to establish. We assign this organism to Rhynchopus because of the papillum. Phase contrast.
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Hemistasia (hem-ee-stays-ee-a) is one of a small number of genera that make up the diplonemids, a subset of euglenozoa. Although not widely reported, they are often encountered in especially marine habitats where they consume detritus, algae, and other moderately sized particles. They have two flagella which insert into a shallow subapical pocket. There are three genera which look similar: Rhynchopus with a papillum and relatively deep flagellar pocket, Diplonema with two short flagella, and Hemistasia with long flagella. The species are polymorphic, making species and generic boundaries very hard to establish. Differential interference contrast.
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Hemistasia (hem-ee-stays-ee-a) phaeocysticola (Scherffel, 1900) Elbrèchter et al., 1996. Cell outline is pyriform to oblong. Cells are about 13 to 33 microns long, metabolic, with a flexible apical papillum and with an indistinct spiral groove. Two flagella insert subapically in a pocket, are unequal in length and wrap around the body during feeding. The posterior flagellum is slightly longer than the anterior flagellum and the cell. During swimming cells rotate. The cells often contain one large food vacuole in the posterior part of the cell. Rarely observed.
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Hemistasia phaeocysticola (Scherffel, 1900) Elbrachter et al., 1996. Cell outline is pyriform to oblong. Cells are about 13 to 33 microns long, metabolic, with a flexible apical papillum and with an indistinct spiral groove. Two flagella insert subapically in a pocket, are unequal in length and wrap around the body during feeding. The posterior flagellum is slightly longer than the anterior flagellum and the cell. During swimming cells rotate. The cells often contain one large food vacuole in the posterior part of the cell.
