Dirty Pair: Mughi is from a species called the Coeurl and has similar tentacles coming from its shoulders.
Fan Works
In "Farce Contact", a Star Trek: EnterpriseParody Fic, Captain Archer is inspired to take his pet beagle Porthos on a mission of exploration because he'd read the book.
The encephalo-adjuster used by Grosvenor in the novel is used by Tech Lieutenant TuV'k in Rocketship Voyager to establish a Mind Meld.
Film — Live-Action
Alien: After the movie came out, Van Vogt sued 20th Century Fox for plagiarism, though the case was settled out of court. The writers denied any connection, and the xenomorph life cycle could well have been inspired by the spider wasp just like the Ixtl was. Indeed, the connections go about as far as 1) there's a malevolent alien being on a spaceship and 2) it incubates its young in human hosts- which could probably sum up about half the Sci-Fi Horror genre today (and at least one example from 20 years *prior* to Alien). In terms of theme, characterization, plot, and even the creature's general design, they're completely different.
Literature
Barlowe's Guide to Extraterrestrials, a mock field guide by Wayne Barlowe, includes entries on the Riim and Ixtl.
The War Against the Chtorr: In A Season for Slaughter, a panther-like Animal Mecha probe called a prowler is described as making a coeurl sound, in a Shout-Out to the opening line: On and on Coeurl prowled.
Live-Action TV
Star Trek: The Original Series: "The Man Trap": The so-called salt vampire might have been inspired by the Coeurl, which drains the body of potassium. It's quite likely the writers were influenced by the book or the original magazine stories as the vibe is quite similar — a military/scientific crew of Bold Explorers seeking out new life who have to deal with a Monster of the Week before moving on to the next adventure.
Displacer beasts, black-furred feline predators with tentacles growing from their shoulders, are visually inspired by Coeurl, although they have different thematic shticks (displacer beasts don't share Coeurl's peculiar feeding habits, and are instead distinguished by a supernatural ability to make themselves invisible while projecting an image of themselves a few meters away).
The more obscure xill is a straight-up lift of the Ixtl: a four-armed, red-skinned, intangible creature that injects its eggs into people.
Video Games
Final Fantasy: The Coeurl is a recurring monster, although its tentacles extend from its whiskers rather than its shoulders.
