Odontopleurida is an order of very spinose trilobites closely related to the trilobites of the order Lichida.[1] Some experts group the Odontopleurid families, Odontopleuridae and Damesellidae, 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.
odontopleurida, order, very, spinose, trilobites, closely, related, trilobites, order, lichida, some, experts, group, odontopleurid, families, damesellidae, within, lichida, odontopleurids, tend, have, convex, shaped, cephalons, lobed, knob, shaped, glabella, . Odontopleurida is an order of very spinose trilobites closely related to the trilobites of the order Lichida 1 Some experts group the Odontopleurid families Odontopleuridae and Damesellidae 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 OdontopleuridaTemporal range Middle Cambrian Frasnian PreꞒ Ꞓ O S D C P T J K Pg NRadiaspis sp Scientific classificationDomain EukaryotaKingdom AnimaliaPhylum ArthropodaClass TrilobitaOrder OdontopleuridaWhittington 1959FamiliesDamesellidae OdontopleuridaeGenera 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 Contents 1 Taxonomy 1 1 Odontopleuridae 1 2 Damesellidae 2 ReferencesTaxonomy editOdontopleuridae edit 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 WhittingtoniaDamesellidae edit Adelogonus Bergeronites Blackwelderia Blackwelderioides Chiawangella Cyrtoprora Damesella Damesops Dipentaspis Dipyrgotes Neodrepanura Duamsannella Fengduia Guancenshania Hercantyx Histiomona Jiawangaspis Karslanus 2 Liuheaspis Metashantungia Neodamesella Palaeadotes Paradamesella Parashantungia Pingquania Pionaspis Protaitzehoia Pseudoblackwelderia Shantungia Stephanocare Taihangshania Taitzehoia Teinistion Xintaia YanshanopygeReferences edit S M Gon III February 28 2009 Order Odontopleurida Retrieved November 23 2010 Huseyin Ozdikmen 2009 Nomenclatural changes for twenty trilobites genera PDF Munis Entomology and Zoology 4 1 155 171 nbsp This Odontopleurida related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Odontopleurida amp oldid 1186449663, wikipedia, wiki, book, books, library,
