Lagena

Lagena is a genus of foraminiferans, a group of amoeboid protists characterized by streaming granular ectoplasm for catching food and other uses. They are typically found in marine environments, but can also be found in freshwater habitats. The genus Lagena is part of the family Lagenidae, within the order Lagenida.

Description

Lagena species are characterized by their elongated, flask-shaped tests (shells), which are usually composed of calcite. The test is typically transparent and smooth, but can sometimes be ornamented with ridges or spines. The aperture, or opening of the test, is usually a small, circular hole located at the end of a short neck.

Distribution and habitat

Lagena foraminiferans are found worldwide, in both marine and freshwater environments. They are particularly common in deep-sea sediments, where they can make up a significant portion of the foraminiferal assemblage. They are also found in brackish environments and in some extreme environments, such as hydrothermal vents.

Ecology

Like all foraminiferans, Lagena species are heterotrophic and consume a variety of food sources, including bacteria, algae, and detritus. They capture their food using pseudopodia, which are extensions of their cytoplasm that they can extend and retract. Some species are also known to host symbiotic algae in their cytoplasm, which can provide them with additional nutrients through photosynthesis.

Taxonomy

The genus Lagena was first described by the British naturalist William Smith in 1817. It is one of several genera within the family Lagenidae, which is characterized by its members' flask-shaped tests. The taxonomy of the genus is complex and has been the subject of much debate, with many species having been moved to other genera or synonymized with other species.

See also

• Foraminifera
• Amoeboid
• Calcite
• William Smith (geologist)

External links

• Marine Species Identification Portal: Lagena

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