Hibbertopteridae (the name deriving from the type genus Hibbertopterus, meaning "Hibbert's wing") is a family of eurypterids, an extinct group of aquatic arthropods.

Hibbertopterids were large, broad and heavy animals unlike virtually every other group of eurypterids, which are commonly streamlined and lightweight.

Hibbertopterids fed using a method referred to as sweep-feeding, in which the animal would rake through the soft sediment of their substrate with specialised blades on their forward-facing appendages to capture small invertebrates.

More shared features are the presence of tongue-shaped scales on the margins of the tergites of the opisthosoma (the abdomen) and that the fourth pair of appendages were covered in spines.

[1] Although Vernonopterus has been estimated to have reached lengths of "just" 50 centimetres (19.7 inches), both Campylocephalus and Hibbertopterus represent true giant eurypterids.

[2] That hibbertopterids were so broad and compact probably means they were the overall heaviest eurypterids, surpassing longer forms, such as the light-weight pterygotids, in weight.

The cladogram below is adapted from Lamsdell (2012),[4] collapsed to only show the superfamily Mycteropoidea.Drepanopterus pentlandicus Drepanopterus abonensis Drepanopterus odontospathus Woodwardopterus scabrosus Mycterops mathieui Hastimima whitei Megarachne servinei Campylocephalus oculatus Hibbertopterus scouleri Hibbertopterus wittebergensis The hibbertopterids were derived sweep-feeders, inhabiting freshwater swamps and rivers and feeding by raking through the soft sediment with blades on their anterior appendages to capture small invertebrates.

In both superfamilies, the adaptations to this lifestyle involves modifications to the spines on their anterior prosomal appendages for raking through the substrate of their habitats.

Some of its species have even further adaptations towards sweep-feeding than other mycteropoids, with its blades modified into comb-like rachis that could entrap smaller prey or other organic food particles.