Seagens

Seagens are a fictional species that appear in the universe of the science fiction novel "Project Hail Mary" by Andy Weir. They are an extraterrestrial race encountered by the protagonist, Ryland Grace. Seagens are described as sentient, crystalline beings that inhabit the oceans of the planet Erid. They possess a unique biological structure, their bodies being composed of intricate, interlocking crystalline formations. Their method of communication is through resonant frequencies and light patterns emitted from their crystalline bodies, a form of bioluminescence.

The Seagens are an advanced civilization with a deep understanding of their planet's ecosystem and the surrounding space. They have developed sophisticated technology, though it is not described in detail, it is implied to be organic and integrated with their crystalline nature. Their society is communal and cooperative, with individuals contributing to the collective knowledge and well-being of their species. The Seagens are initially wary of the human visitors but eventually form a crucial alliance with Ryland Grace, aiding him in his mission to save Earth. Their primary motivation is the preservation of their own species and the delicate balance of life on Erid. Their appearance is alien and non-humanoid, emphasizing their distinct evolutionary path.