# The genus Eutreptiella (Euglenophyceae/Euglenozoa) across its global distribution range

## TL;DR

This paper reviews the genus Eutreptiella, focusing on its ecological roles, biotechnological potential, and genetic variability across global marine ecosystems.

## Contribution

The paper provides a comprehensive overview of Eutreptiella's taxonomic, ecological, and biotechnological significance, highlighting its genetic variability and potential misidentifications.

## Key findings

- Eutreptiella species show high phenotypic plasticity and adapt to diverse environmental conditions.
- Genetic studies reveal complex regulatory mechanisms and potential for biofuel and nutraceutical production.
- Eutreptiella blooms impact local ecosystems and interact with bacteria to enhance growth and metabolism.

## Abstract

The genus Eutreptiella (Euglenophyceae/Euglenozoa) comprises unicellular organisms known for their photosynthetic capacity and significant role in marine ecosystems. This review highlights the taxonomic, ecological, and biotechnological characteristics of Eutreptiella species, emphasizing their morphological and genomic adaptations. Eutreptiella species exhibit high phenotypic plasticity, enabling adaptation to various environmental conditions, from nutrient‐rich waters to high‐salinity conditions. They play a crucial role in primary production and nutrient cycling in marine ecosystems. Genetic and transcriptomic studies have revealed their complex regulatory mechanisms and potential for biofuel and nutraceutical production. Eutreptiella blooms significantly impact local ecosystems, influencing nutrient availability and community dynamics. Additionally, interactions with associated bacteria enhance their growth and metabolic capabilities. The genus shows substantial genetic variability, suggesting potential misidentifications or a polyphyletic nature. Further comprehensive studies are needed to clarify their taxonomy and evolutionary relationships. Understanding and managing Eutreptiella populations is essential to leverage their biotechnological potential and ensure the health of marine ecosystems.

The genus Eutreptiella across its global distribution range.