A Lycosa tarantula (2369)

Lycosa tarantula was the scientific name for a species of spider that originated from Spain on Earth. Some were known to be kept as pets. At some point, a number of tarantulas of this type were taken to the planet Titus IV.

Miles O'Brien kept a tarantula named "Christina" as a pet in the early 2360s while he served aboard the USS Enterprise-D. Though Chief O'Brien was once afraid of spiders, he took her in as a pet after almost stepping on her on Titus IV. He once showed Christina to Lieutenant Barclay, who wasn't particularly fond of it. (TNG: "Realm of Fear")

The spider shown in the episode is not in fact a Lycosa tarantula, but a Brachypelma hamorii, a species of true tarantula from Mexico. Lycosas are wolf spiders, and not actually tarantulas. Tarantulas fall into the family Theraphosidae.
It should be noted that Christina was never seen, nor mentioned during the entire run of Star Trek: Deep Space Nine or any other time than "Realm of Fear" on Star Trek: The Next Generation.

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