Homalonotidae
Encyclopedia
Homalonotidae is a family of trilobite
s that lived from the Ordovician
to the Devonian
. They are characterised by a shovel
-like cephalon (head), and are closely related to the family Calymenidae
.
It contains the following genera:
Trilobite
Trilobites are a well-known fossil group of extinct marine arthropods that form the class Trilobita. The first appearance of trilobites in the fossil record defines the base of the Atdabanian stage of the Early Cambrian period , and they flourished throughout the lower Paleozoic era before...
s that lived from the Ordovician
Ordovician
The Ordovician is a geologic period and system, the second of six of the Paleozoic Era, and covers the time between 488.3±1.7 to 443.7±1.5 million years ago . It follows the Cambrian Period and is followed by the Silurian Period...
to the Devonian
Devonian
The Devonian is a geologic period and system of the Paleozoic Era spanning from the end of the Silurian Period, about 416.0 ± 2.8 Mya , to the beginning of the Carboniferous Period, about 359.2 ± 2.5 Mya...
. They are characterised by a shovel
Shovel
A shovel is a tool for digging, lifting, and moving bulk materials, such as soil, coal, gravel, snow, sand, or ore. Shovels are extremely common tools that are used extensively in agriculture, construction, and gardening....
-like cephalon (head), and are closely related to the family Calymenidae
Calymenidae
Calymenidae is a family of trilobites, containing the following genera:*Alcymene*Apocalymene*Arcticalymene*Calymene*Calymenella*Calymenesun*Colpocoryphe*Dekalymene*Diacalymene*Flexicalymene*Gravicalymene...
.
It contains the following genera:
- ArduennellaArduennellaArduennella is a genus of trilobite in the order Phacopida, which existed in what is now Belgium. It was described by Wenndorf in 1990, and the type species is Arduennella maillieuxi, which was originally described as Homalonotus maillieuxi by Asselberghs in 1923.-External links:* at the...
- Brongniartella
- Burmeisterella
- Burmeisteria
- Digonus
- Dipleura
- Eohomalonotus
- HomalonotusHomalonotusHomalonotus is an extinct genus of trilobite in the order Phacopida. It contains several species including H. armatus and H. roemeri.-External links:* at the Paleobiology Database...
- Huemacaspis
- Iberocoryphe
- Kerfornella
- Leiostegina
- Parahomalonotus
- Plaesiacomia
- Platycoryphe
- Scabrella
- Trimerus