Cells of the genus *Euglena* are oval-shaped and possess a variety of specialized internal structures. These include a long flagellum located near a light-sensing photoreceptor (paraflagellar body) and a red stigma (eyespot). The cell contains a nucleus with a nucleolus, green chloroplasts for photosynthesis, stored photosynthetic polysaccharides, a contractile vacuole, and a pellicle composed of protein bands that surrounds and supports the cell membrane.

Structure of Euglena

Euglena is a genus of non-pathogenic euglenozoans. Its cells are characterized by having two flagella, a stigma (eyespot) to detect light, chloroplasts for conducting photosynthesis, and a pellicle composed of protein bands that supports the cell membrane and maintains cell shape.

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Euglenozoans are a subgroup of the Excavata supergroup. Although some species are photosynthetic, they are not classified as algae because they are motile and ingest food.

Euglenozoans

A pellicle is a cellular structure consisting of a series of protein bands that surrounds the cell membrane in certain protozoans, providing structural support and defining the cell's shape.

Pellicle

https://openstax.org/details/books/microbiology/

Microbiology covers the scope and sequence requirements for a single-semester microbiology course for non-majors. The book presents the core concepts of microbiology with a focus on applications for careers in allied health. The pedagogical features of the text make the material interesting and accessible while maintaining the career-application focus and scientific rigor inherent in the subject matter. Microbiology’s art program enhances students’ understanding of concepts through clear and effective illustrations, diagrams, and photographs.

Microbiology is produced through a collaborative publishing agreement between OpenStax and the American Society for Microbiology Press. The book aligns with the curriculum guidelines of the American Society for Microbiology.

OpenStax Microbiology Textbook

Trypanosoma is a genus of euglenozoans containing parasites that cause African sleeping sickness and Chagas disease.

Trypanosoma

Leishmania is a genus of trypanosomes within the euglenozoans that cause disfiguring skin disease and sometimes systemic illness.

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