Barbed Thermotropic Vine
Their non-Tyranid variation - Thermotropic Vine grows on cold planets where heat is valuable recource. They adapted to it by sending a tendrils to any warm object, seize it and grows rapidly around it to create another clump of vine. Actually vines don't kill their victim, but unable it to move, slowly leaching out it's warmness.
- 1: White Dwarf #254 (US), "Hostile Terrain" by Pete Haines
- 2: Warhammer 40,000: Rogue Trader, pgs. 218-219