Ensign Altoss was an Efrosian female who lived in the 24th century. She was a Starfleet security officer aboard the USS Aventine.
Altoss' mother was killed during the Dominion invasion of Betazed. Altoss was assigned to the USS Centaur after the Dominion War. (ST novel: A Singular Destiny)
After the runabout USS Seine escaped from the Aventine by blowing out the shuttlebay doors, Altoss was a member of the boarding party to recover the runabout after it passed through a subspace tunnel ending in the Azure Nebula. (ST - Destiny novel: Gods of Night)