Both ends look similar, but the end with the head is narrower and has two eyespots. They are slug can be quite common in gardens. Black-velvet leatherleaf slug, Angustipes Three-banded garden slug, Lehmannia ameghini, was first reported in New Orleans valentiana. In addition to the New Guinea flatworm, TISI also warned of another invasive species that can carry rat lungworm -- the Black Velvet Leatherleaf slug. Butter and garlic salt! This slug is native to the warmer parts of the SouthEast US. ... are those the jet black variety,those are really cool slugs i know the red ones are amazing.....i know i like these balls of loogies. The tropical leatherleaf slug measures 70-80 mm long. The slug is a gastropod, which means " stomach-foot ". The New Guinea flatworm may be tiny, but it can carry a dangerous parasite. It is dark-colored (grayish) with raised pustules/tubercles and a characteristically narrow foot.A pale brown line spans the length of its dorsum. (