Rather than using a web, adult females catch their prey by using a line with one or two sticky drops (a "bolas") which they swing.

[2] A 2020 molecular phylogenetic analysis placed the genus in the informal group mastophorines of a broadly defined subfamily Cyrtarachninae s.l.

[3] The relationship of Exechocentrus lancearius (then the only species in the genus) to the bolas spiders placed in the tribe Mastophoreae had been noted by Emerit in 2000.

However, the foraging behaviour of E. lancearius was not known until 2009 when a female using a bolas was observed shortly after sunset.

It had produced a horizontal line of silk underneath a leaf about 1.5 m above the ground.

The bolas was manipulated with the second pair of legs and swung in a horizontal direction.