Sinharaja rainforest terrestrial land leeches (Haemadipsa zeylanica): sensory vibration detection and repellent?

Terrestrial land leeches (Haemadipsa zeylanica) inhabiting the leaf litter of Sinharaja rainforest are highly sensitive ambush hunters. They possess specialized photoreceptor eye-spots and cutaneous vibration-sensing mechanoreceptors along their ventral rings that detect footstep seismic waves across wet soil from several meters away. As a hiker approaches, leeches rear up on their posterior suckers, swaying their bodies to lock onto carbon dioxide plume cues before looping forward onto boots and trousers. Wearing tightly woven calico canvas anti-leech socks impregnated with tobacco water or DEET paralyzes their sucker adhesion upon contact.