"What's the matter? All I said was that Komaytos look like little Metr—" Non-canon warning: This article or section contains information that may not be considered an official part of the Metroid series in the overall storyline by Nintendo.
Salamanders were an unused species intended for Metroid Prime 3: Corruption. Their Logbook entry has no text, instead, just the word "Placeholder", and from the wording it can be assumed it was meant to be a swarming vermin-type creature. It may be related to the Lumigeks.