Odontopleurida is an

order Order, ORDER or Orders may refer to: * A socio-political or established or existing order, e.g. World order, Ancien Regime, Pax Britannica * Categorization, the process in which ideas and objects are recognized, differentiated, and understood ...

of very spinose

trilobite Trilobites (; meaning "three-lobed entities") are extinction, extinct marine arthropods that form the class (biology), class Trilobita. One of the earliest groups of arthropods to appear in the fossil record, trilobites were among the most succ ...

s closely related to the trilobites of the order

Lichida Lichida is an order of typically spiny trilobite that lived from the Furongian to the Devonian period. These trilobites usually have 8–13 thoracic segments. Their exoskeletons often have a grainy texture or have wart or spine-like tubercles. So ...

. Some experts group the Odontopleurid families, Odontopleuridae and

Damesellidae Damesellidae is a family of odontopleurida, odontopleurid trilobites found in late Middle to Late Cambrian marine strata, primarily of China. Damesellids are closely related to the odontopleurids of Odontopleuridae, but are not nearly as spinose ...

, within Lichida. Odontopleurids tend to have convex, bar-shaped cephalons, and lobed, knob-shaped glabella that extend to, or almost to the anterior margin. Many, if not almost all odontopleurids have long spines that are derived either from the margins of the exoskeleton, or from granular or tubercular ornamentation, or both. Many odontopleurids are so spinose so as to be described as having "spines on (their) spines." Odontopleurids have 8 to 13 thoracic segments, with Odontopleuridae odontopleurids having no more than 10, and Damesellidae odontopleurids having no more than 13. The pygidium tends to be very small, and invariably has long spines emanating from it in all known genera. Genera of Damesellidae are restricted to Middle to Upper Cambrian marine strata, and may represent a transition between Cambrian-aged lichids, and odontopleurids of Odontopleuridae. The odontopleurids of Odontopleuridae first appear in the Upper Cambrian, and go extinct before the end of the Frasnian stage of the late

Devonian The Devonian ( ) is a period (geology), geologic period and system (stratigraphy), system of the Paleozoic era (geology), era during the Phanerozoic eon (geology), eon, spanning 60.3 million years from the end of the preceding Silurian per ...

Taxonomy

Odontopleuridae

*'' Acanthalomina'' *?'' Acidaspidella'' *?'' Acidaspides'' *'' Acidaspis'' *'' Anacaenaspis'' *'' Apianurus'' *'' Archaeopleura'' *'' Boedaspis'' *'' Borkopleura'' *'' Brutonaspis'' *'' Calipernurus'' *'' Ceratocara'' *'' Ceratocephala'' *'' Ceratocephalinus'' *'' Ceratonurus'' *'' Chlustinia'' *'' Dalaspis'' *'' Diacanthaspis'' *'' Dicranurus'' *'' Dudleyaspis'' *'' Edgecombeaspis'' *'' Eoleonaspis'' *'' Exallaspis'' *'' Gaotania'' *'' Globulaspis'' *'' Hispaniaspis'' *'' Isoprusia'' *'' Ivanopleura'' *'' Kettneraspis'' *'' Koneprusia'' *'' Laethoprusia'' *'' Leonaspis'' *'' Meadowtownella'' *'' Miraspis'' *'' Ningnanaspis'' *'' Odontopleura'' *'' Orphanaspis'' *'' Periallaspis'' *'' Primaspis'' *'' Proceratocephala'' *'' Radiaspis'' *'' Rinconaspis'' *'' Selenopeltis'' *'' Selenopeltoides'' *'' Sinespinaspis'' *'' Stelckaspis'' *'' Taemasaspis'' *''

Uriarra Uriarra Village is a town in the district of Coree, in the Australian Capital Territory in Australia. It is situated on the western side of the Australian Capital Territory, about 30 minutes from Canberra, established in 1928 at the foothills of ...

'' *'' Whittingtonia''

Damesellidae

*?'' Adelogonus'' *'' Bergeronites'' *'' Blackwelderia'' *'' Blackwelderioides'' *'' Chiawangella'' *'' Cyrtoprora'' *'' Damesella'' *'' Damesops'' *'' Dipentaspis'' *'' Dipyrgotes'' *''

Neodrepanura ''Neodrepanura'' is an extinct genus of Damesellidae, damesellid odontopleurida, odontopleurid trilobite. Taxonomy Species of ''Neodrepanura'' are better known under the older synonym, ''Drepanura'': the genus was renamed as ''Neodrepanura'' in 2 ...

'' *'' Duamsannella'' *'' Fengduia'' *'' Guancenshania'' *?'' Hercantyx'' *'' Histiomona'' *'' Jiawangaspis'' *'' Karslanus'' *'' Liuheaspis'' *'' Metashantungia'' *'' Neodamesella'' *'' Palaeadotes,'' *'' Paradamesella'' *'' Parashantungia'' *'' Pingquania'' *'' Pionaspis'' *'' Protaitzehoia'' *'' Pseudoblackwelderia'' *'' Shantungia'' *'' Stephanocare'' *'' Taihangshania'' *'' Taitzehoia'' *'' Teinistion'' *'' Xintaia'' *'' Yanshanopyge''

References

Trilobite orders Miaolingian first appearances Frasnian extinctions {{Odontopleurida-stub