Gug

Gugs are a new monster in SLASH'EM. They seem to appear in groups and have a paralyzing bite, but by the time you find them, you should have a way to avoid the paralysis.

Encyclopedia entry

These foul creatures dwell in the endless darkness of the 
Gulf of N'Kai, scavenging the bones of whatever luckless
intruders have stumbled into it.  It is suspected that they
may be some warped form of ghoul, but few have survived 
seeing them so information is scarce.