Homalonotidae is a family of

trilobite Trilobites (; meaning "three lobes") are extinct marine arthropods that form the class Trilobita. Trilobites form one of the earliest-known groups of arthropods. The first appearance of trilobites in the fossil record defines the base of the ...

s that lived from the

Ordovician The Ordovician ( ) is a geologic period and system, the second of six periods of the Paleozoic Era. The Ordovician spans 41.6 million years from the end of the Cambrian Period million years ago (Mya) to the start of the Silurian Period Mya. T ...

to the Devonian. They are characterised by a

shovel A shovel is a tool used for digging, lifting, and moving bulk materials, such as soil, coal, gravel, snow, sand, or ore. Most shovels are hand tools consisting of a broad blade fixed to a medium-length handle. Shovel blades are usually made o ...

-like cephalon (head), and are closely related to the family

Calymenidae Calymenidae is a family of trilobite Trilobites (; meaning "three lobes") are extinct marine arthropods that form the class Trilobita. Trilobites form one of the earliest-known groups of arthropods. The first appearance of trilobites in the ...

. It contains the following genera: *'' Arduennella'' *''Brongniartella'' *'' Burmeisterella'' *'' Burmeisteria'' *'' Digonus'' *''

Dipleura ''Dipleura'' is a genus of trilobites in the order Phacopida. It was described by Green in 1832, and the type species is ''Dipleura dekayi''. The type locality was in the Hamilton Group in New York. Distribution Fossils of this genus have b ...

'' *'' Eohomalonotus'' *'' Homalonotus'' *'' Huemacaspis'' *'' Iberocoryphe'' *'' Kerfornella'' *'' Leiostegina'' *'' Parahomalonotus'' *'' Plaesiacomia'' *'' Platycoryphe'' *'' Scabrella'' *'' Trimerus''

References

Calymenina Trilobite families {{phacopida-stub