Ectrichodia crux is a remarkable species of millipede assassin bug from southern Africa, prized by enthusiasts for its striking appearance and highly specialised predatory behaviour. Adults display a glossy black body with distinctive red markings, including the characteristic cross-shaped pattern on the thorax that gives the species its name. Their bold colouration serves as a warning to potential predators and makes them one of the most recognisable assassin bugs in the hobby.

Unlike many predatory insects that feed opportunistically, E. crux is a specialist hunter of millipedes. Using its powerful piercing mouthparts, it overcomes prey that many predators avoid due to their chemical defences. After subduing a millipede, the bug injects digestive enzymes and feeds on the liquefied tissues. This unique feeding strategy has made the species a subject of particular interest among entomologists and invertebrate keepers alike.

In captivity, Ectrichodia crux is best suited to experienced keepers who can meet its specialist dietary requirements. A warm, well-ventilated terrestrial enclosure furnished with leaf litter, cork bark and other natural refuges allows the insects to exhibit natural behaviour. Their unusual ecology, attractive colouration and fascinating hunting techniques make them an exceptional display species for collectors seeking something truly different from more commonly kept invertebrates.