Denkir IV

Denkir IV was the fourth planet in its star system, known for its aquatic life.

The study of the evolution of intelligent life on Denkir IV was a common lesson in classrooms on both the USS Enterprise (NCC-1701-D) and Deep Space 9. A large okudagram depicting various aquatic lifeforms and their biological relationships was often seen on display. 

Lifeforms

 * Delphoidia
 * Delphoidia cochrani
 * Delphoidia cochrani tempus
 * Delphoidia cochrani obliquidens
 * Delphoidia moroboshi
 * Delphoidia moroboshi lum
 * Oceosauroida
 * Oceosauroida mendo
 * Oceosauroida mendo shinobu
 * Oceosauroida mendo shutaro
 * Neopictis
 * Neopictis spinotap
 * Neopictis spinotap cochrani
 * Neopictis gourami
 * Squaluformus
 * Squaluformus vino
 * Squaluformus vino shiro
 * Vermacelli alfredo
 * Oniboshi lum
 * Oniboshi lum ran
 * Oniobshi benten

Background
The term "Denkir" (which appeared a number of times) dates back to a non-Trek related SF story written by Rick Sternbach.  He created some art for the story, including a painting meaning to depict Denkir IV from the perspective of its inner moon, which he later re-used as set artwork. Copies of this painting can be found displayed aboard the USS Enterprise (NCC-1701-D) in the observation lounge and in guest quarters. Marla Aster also had a copy of the painting in her quarters aboard the Enterprise.