Haliestes is a genus of sea spider (pycnogonid) from the Silurian aged Coalbrookdale Formation of England.

[1] Haliestes is a tiny sea spider measured only up to 5.7 mm in body length.

The chelifores featured a robust, upward-facing pincer, connected to the front by a 2-segmented scape.

The 8 legs are over twice of its body length, sharing some traits with the younger Hunsrück pycnogonids (e.g. Palaeoisopus, Pentapantopus) such as annulated coxa 1, paddle-like segments lined with long setae and hooked, robust terminal claw.

[2] Haliestes is considered to be a nektonic predator, swimming by using its legs and hunting with its cephalic appendages.