Lashworm
Lashworms are small, carnivorous creatures which live in small fissures in walls, stones, trees, and so on. These are carefully disguised by the creature (using bits of moss, etc.) so as to be virtually invisible to all but the closest of inspections - and, even then, only the sensitive, hair-like "trigger" is normally visibile (at the gamesmaster's option, a character with Identify Plants skill may be able to recognise it for what it is). The trigger hairs can sense movement, such as a creature passing within 5 yards of the Lashworm's hole. This activates the lash, a saw-edged organ, 5 yards long, thin, and incredibly fast, which strikes its target, rasps away a portion of flesh, and then whips back into the crevice where the meal is digested. The Lashworm will not attack again for several hours.
Phsyique
There are a number of underground varieties, as well as those living in forests and jungles. A Lashworm has two distinct parts: the main part, or 'anchor', comprises the vital organs, including the mouth and stomach, and is used to secure the creature while it attacks with the other part - the 'lash'. This is usually curled up tightly within the creature's home crevice, until triggered by its sensitive hair-triggers, which are left outside the hole and which resemble moss or plant growth.