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- Ptychopariida abstract "Ptychopariida is a large, heterogeneous order of trilobite containing some of the most primitive species known. The earliest species occurred in the second half of the Lower Cambrian, and the last species did not survive the Ordovician–Silurian extinction event.Trilobites have facial sutures that run along the margin of the glabella and/or fixigena to the shoulder point where the cephalon meets the thorax. These sutures outline the cranidium, or the main, central part of the head that does not include the librigena (free cheeks). The eyes are medial along the glabella on the suture line (however, some species have no eyes). The fossils of the moults of trilobites can often be told from the fossils of the actual animals by whether or not the librigena are present. (The librigena are no longer attached in moults.) In Ptychopariida, short bladelike genal spines are often present on the tips of the librigena.The thorax is large and is typically made up of eight or more segments. The thorax is usually much longer than the pygidium, which is usually small. In some species the pygidium is outlined with a flat border.The Subclass Librostoma was recently created to encompass several related orders: Ptychopariida, Asaphida, Proetida, Harpetida, and possibly the Phacopida. These are now known as the "Librostome Orders". The Proetida and Harpetida were originally included in Order Ptychopariida.".
- Ptychopariida thumbnail ElrathiaKingi.jpg?width=300.
- Ptychopariida wikiPageExternalLink ptychopa.htm.
- Ptychopariida wikiPageExternalLink index.html.
- Ptychopariida wikiPageID "1770395".
- Ptychopariida wikiPageLength "2517".
- Ptychopariida wikiPageOutDegree "28".
- Ptychopariida wikiPageRevisionID "675983881".
- Ptychopariida wikiPageWikiLink Asaphida.
- Ptychopariida wikiPageWikiLink Cambrian.
- Ptychopariida wikiPageWikiLink Category:Cambrian_first_appearances.
- Ptychopariida wikiPageWikiLink Category:Late_Ordovician_extinctions.
- Ptychopariida wikiPageWikiLink Category:Ptychopariida.
- Ptychopariida wikiPageWikiLink Category:Trilobites.
- Ptychopariida wikiPageWikiLink Cephalon_(arthropod_anatomy).
- Ptychopariida wikiPageWikiLink Cephalon_(arthropod_head).
- Ptychopariida wikiPageWikiLink Ecdysis.
- Ptychopariida wikiPageWikiLink Ellipsocephaloidea.
- Ptychopariida wikiPageWikiLink Elrathia.
- Ptychopariida wikiPageWikiLink Elrathia_kingii.
- Ptychopariida wikiPageWikiLink Facial_suture.
- Ptychopariida wikiPageWikiLink Fossil.
- Ptychopariida wikiPageWikiLink Glabella.
- Ptychopariida wikiPageWikiLink Harpetida.
- Ptychopariida wikiPageWikiLink Meniscopsia.
- Ptychopariida wikiPageWikiLink Olenina.
- Ptychopariida wikiPageWikiLink Order_(biology).
- Ptychopariida wikiPageWikiLink Ordovician–Silurian_extinction_event.
- Ptychopariida wikiPageWikiLink Ordovician–Silurian_extinction_events.
- Ptychopariida wikiPageWikiLink Phacopida.
- Ptychopariida wikiPageWikiLink Proetida.
- Ptychopariida wikiPageWikiLink Ptychopariina.
- Ptychopariida wikiPageWikiLink Ptychoparioidea.
- Ptychopariida wikiPageWikiLink Pygidium.
- Ptychopariida wikiPageWikiLink Raymondinidae.
- Ptychopariida wikiPageWikiLink Suborder.
- Ptychopariida wikiPageWikiLink Swinnerton.
- Ptychopariida wikiPageWikiLink Trilobite.
- Ptychopariida wikiPageWikiLink File:Asaphiscuswheelerii.jpg.
- Ptychopariida wikiPageWikiLinkText "Ptychopariid".
- Ptychopariida wikiPageWikiLinkText "Ptychopariida".
- Ptychopariida wikiPageWikiLinkText "ptychopariid".
- Ptychopariida authority "Swinnerton, 1915".
- Ptychopariida hasPhotoCollection Ptychopariida.
- Ptychopariida imageCaption "Elrathia kingii".
- Ptychopariida imageWidth "230".
- Ptychopariida subdivision "*Suborder Ptychopariina **Superfamily Ellipsocephaloidea **Superfamily Ptychoparioidea *Suborder Olenina *Suborder uncertain **Superfamily Raymondinacea".
- Ptychopariida subdivisionRanks "Suborders".
- Ptychopariida taxon "Ptychopariida".
- Ptychopariida wikiPageUsesTemplate Template:Automatic_taxobox.
- Ptychopariida wikiPageUsesTemplate Template:Ptychopariida.
- Ptychopariida subject Category:Cambrian_first_appearances.
- Ptychopariida subject Category:Late_Ordovician_extinctions.
- Ptychopariida subject Category:Ptychopariida.
- Ptychopariida subject Category:Trilobites.
- Ptychopariida hypernym Order.
- Ptychopariida type Article.
- Ptychopariida type Eukaryote.
- Ptychopariida type Species.
- Ptychopariida type Article.
- Ptychopariida type Thing.
- Ptychopariida type Q19088.
- Ptychopariida comment "Ptychopariida is a large, heterogeneous order of trilobite containing some of the most primitive species known. The earliest species occurred in the second half of the Lower Cambrian, and the last species did not survive the Ordovician–Silurian extinction event.Trilobites have facial sutures that run along the margin of the glabella and/or fixigena to the shoulder point where the cephalon meets the thorax.".
- Ptychopariida label "Ptychopariida".
- Ptychopariida sameAs Ptychopariida.
- Ptychopariida sameAs Ptychopariida.
- Ptychopariida sameAs m.05vmdr.
- Ptychopariida sameAs Ptychopariida.
- Ptychopariida sameAs Ptychopariida.
- Ptychopariida sameAs Q987705.
- Ptychopariida sameAs Q987705.
- Ptychopariida sameAs 褶頰蟲目.
- Ptychopariida wasDerivedFrom Ptychopariida?oldid=675983881.
- Ptychopariida depiction ElrathiaKingi.jpg.
- Ptychopariida isPrimaryTopicOf Ptychopariida.