Osnullus
The Osnullus were a sentient species. By the late 2250s, members of this species were serving in Starfleet. ()

Biology
They had large non-humanoid heads with no mouth, with otherwise humanoid bodies. They had six eyes, two large and four small. An individual's skin color could vary, including pink and purple. ()

History
Several members of this species served on the  in 2257. ()

In the 32nd century, members of this species served in the Emerald Chain security force on Hima as well as in Starfleet. ()

In 3190, Osnullus delegates were present at the Multilateral DMA Strategy Assembly and voted for diplomacy with Unknown Species 10-C. ()

People
 Rahma
 Unnamed Osnullus

Appendices

Appearances

Background information 

The name of the species was not spoken on screen, but was seen on a delegate's voting holo and a voting tally in . A close-up of the tally was later released by graphic designer Timothy Peel.  Prior to "...But to Connect", the name was known from background sources. 

Glenn Hetrick, Department Head of Prosthetic and Special F/X Makeup for , used the term "Osnullus" on the Alchemy Studios website. The website features images of the head sculpt and hand sculpt of this species.  The species had also been referred to as "Osnullus" by other production sources such as actress Avaah Blackwell and director/executive producer Olatunde Osunsanmi.   

Osnullus is a broken-Latin formation intended to express "mouthless", from Latin noun os, oris (mouth) + pronoun nullus (none).
Species

Apocrypha
According to the Star Trek: Discovery Campaign Guide, Osnullus eat through specialized feeding ports in their fingers due to their lack of mouth. They have a caste-based society.