Tolnep

The Tolneps are an alien species that had warred with the Psychlos.

Biology
The Tolneps were short, about half the size of a Psychlo, and they could breathe almost anything. And were immune to Psychlo gas barrages. Their bite was deadly poison. They had a body density comparable to iron. They couldn't be killed with an ordinary blast gun. Tolneps always wore face masks. They saw in infrared only and had to have a filter plate as went totally blind when subjected to shorter wavelength light and they could be killed only with ultraviolet weapons. They were intensely allergic to cold and had a body heat of around two hundred degrees, or was it three hundred.

Culture
The Tolneps came from somewhere near the star cluster in the current universe. They had mastered time control and could hold it frozen and their ships made long piratical voyages.

Appearance

 * * Battlefield Earth