Researchers from the **University of California**, Santa Barbara, were surprised to find specimens of **Bougainvillia cf. muscus** in their study tanks. It is a **little-known jellyfish** that has **28 simple eyes** and whose **genome has barely been explored**.
This discovery, led by Aide Macias-Muñoz and Rebecca Varney, and published in **Oxford Academic**, provides key information about the **biology and evolution of hydrozoans**, a group of cnidarians that includes **jellyfish, corals, and anemones**.
## Unique Characteristics of Bougainvillia cf. muscus
This jellyfish, described as a hydrozoan with 4 marginal bulbs, has **7 ocelli per bulb**, totaling **28 simple eyes**.
According to **Science Direct**, **ocelli** are visual structures that detect light and darkness, but with low resolution. They also allow movement, though not as precisely as more complex eyes.
This distinctive trait could provide clues about the **adaptation and evolution of visual systems in cnidarians**, by comparing species with and without eyes.
## Collection and Genetic Analysis of Samples
The specimens were collected from a **seawater tank at 25 °C**, where **T. cytostophora** polyps were also found, a species native to **Puerto Rico and Florida** but maintained in culture in Denmark.
In September 2021, the researchers noticed the **presence of several small jellyfish** and proceeded to collect 15 individuals. The goal was to **compare their genome** with that of other better-documented hydrozoans.
Genetic exploration revealed **possible genes related to vision**, opening the door to future studies on **ocular development and light detection in cnidarians**.
*”Most species of this phylum have not been sequenced due to the difficulties in cultivating them in the laboratory,”* notes the publication supported by **The Genetics Society of America**.
This **new hydrozoan genome** is a **valuable resource** for comparative biology, allowing for a better understanding of the **evolution of sensory systems in metazoans**.
## A Key Discovery in the Study of Cnidarians
The discovery of **Bougainvillia cf. muscus** expands knowledge about the **genetic diversity and visual adaptations** of cnidarians. It underscores the importance of continuing **genomic research** on understudied species.
This study not only provides data on **vision in jellyfish**, but also establishes a foundation for future evolutionary analyses within **marine biology**.
