Textulariida

Textulariida is an order of foraminifera, which are single-celled eukaryotic microorganisms. These organisms are characterized by their agglutinated tests, meaning their shells are constructed from particles of sediment cemented together. This agglutination is a key feature distinguishing them from other foraminiferal groups that secrete calcareous or siliceous tests. The chamber arrangement in Textulariida is typically biserial, meaning two chambers are added at each growth stage, arranged in opposite directions. However, other arrangements like triserial or even more complex patterns can occur in some species.

Textulariida are found globally in a wide range of marine environments, from shallow coastal waters to the deep sea. They play a role in benthic ecosystems and their fossilized tests are valuable for biostratigraphy, helping to date rock formations. The diversity within Textulariida is considerable, with numerous genera and species described. Their feeding strategy involves pseudopodia, extensions of the cytoplasm, which are used to capture food particles. Reproduction in foraminifera, including Textulariida, typically involves both asexual and sexual phases, though the details can vary. The study of Textulariida contributes to our understanding of marine paleoecology and the evolution of protists.