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- Asaphida abstract "Asaphida is a large, morphologically diverse order of trilobite found in strata dated from the Middle Cambrian to the Silurian. The order contains six superfamilies (Anomocaroidea, Asaphoidea, Cyclopygoidea, Dikelocephaloidea, Remopleuridoidea and Trinucleioidea), but no suborders. Asaphids comprise some 20% of described fossil trilobites.The Asaphida generally have cephalon (head) and pygidium (tail) parts similar in size, and most species have a prominent median ventral suture. Heads are often flat, and carapace furrows in the head area are often faint or not visible. Thoracic segments typically number 5 - 12, though some species have as few as two and some as many as 30. They also generally have a wide doublure, or rim, that surrounds the cephalon. This causes some specimens to be described as having a characteristic "snowplow" shaped cephalon. Eyes are typically large.One Asaphida line, the Superfamily Asaphoidea, shows a continuous evolution of eyestalks, from ones with mere eye stubs to Asaphus kowalewskii, a trilobite popular with collectors that sported long, eye-tipped stalks. This line is found in the Middle Ordovician Asery Level deposits of the Volkhov River region near Saint Petersburg, Russia. During the Ordovician, what is now Eastern Europe was a shallow inland sea. This eye-stalk development is believed to be an adaptation to changes in turbidity during this time, with eye-stalked trilobites like A. kowalewski presumably arising in a time of increased turbidity. One thought is that this trilobite may have lain in wait for prey buried in the bottom sediment with only its periscope eyestalks protruding.The major extinction event marking the end of the Ordovician Period reduced the diversity of all trilobite orders with most asaphid families disappearing. The only surviving asaphids were members of superfamily Trinucleioidea, and they too disappeared before the end of the Silurian Period.The following families are included:".
- Asaphida class Librostoma.
- Asaphida class Trilobite.
- Asaphida kingdom Animal.
- Asaphida phylum Arthropod.
- Asaphida thumbnail Asaphus.jpg?width=300.
- Asaphida wikiPageID "1044533".
- Asaphida wikiPageLength "3752".
- Asaphida wikiPageOutDegree "71".
- Asaphida wikiPageRevisionID "673370502".
- Asaphida wikiPageWikiLink Alsataspididae.
- Asaphida wikiPageWikiLink Andrarinidae.
- Asaphida wikiPageWikiLink Animal.
- Asaphida wikiPageWikiLink Anomocarellidae.
- Asaphida wikiPageWikiLink Anomocaridae.
- Asaphida wikiPageWikiLink Anomocaroidea.
- Asaphida wikiPageWikiLink Aphelaspididae.
- Asaphida wikiPageWikiLink Arthropod.
- Asaphida wikiPageWikiLink Asaphidae.
- Asaphida wikiPageWikiLink Asaphoidea.
- Asaphida wikiPageWikiLink Asaphus_kowalewskii.
- Asaphida wikiPageWikiLink Asaphus_lepidurus.
- Asaphida wikiPageWikiLink Auritamiidae.
- Asaphida wikiPageWikiLink Bohemillidae.
- Asaphida wikiPageWikiLink Cambrian.
- Asaphida wikiPageWikiLink Category:Cambrian_first_appearances.
- Asaphida wikiPageWikiLink Category:Cambrian_trilobites.
- Asaphida wikiPageWikiLink Category:Ordovician_trilobites.
- Asaphida wikiPageWikiLink Category:Silurian_extinctions.
- Asaphida wikiPageWikiLink Category:Silurian_trilobites.
- Asaphida wikiPageWikiLink Category:Trilobites.
- Asaphida wikiPageWikiLink Cephalon_(arthropod_anatomy).
- Asaphida wikiPageWikiLink Cephalon_(arthropod_head).
- Asaphida wikiPageWikiLink Ceratopygidae.
- Asaphida wikiPageWikiLink Cyclopygidae.
- Asaphida wikiPageWikiLink Cyclopygoidea.
- Asaphida wikiPageWikiLink Dikelocephalidae.
- Asaphida wikiPageWikiLink Dikelocephaloidea.
- Asaphida wikiPageWikiLink Dikelokephaloidea.
- Asaphida wikiPageWikiLink Dionididae.
- Asaphida wikiPageWikiLink Eurekiidae.
- Asaphida wikiPageWikiLink Europe.
- Asaphida wikiPageWikiLink Evolution.
- Asaphida wikiPageWikiLink Fossil.
- Asaphida wikiPageWikiLink Hungaiidae.
- Asaphida wikiPageWikiLink Idahoiidae.
- Asaphida wikiPageWikiLink Librostoma.
- Asaphida wikiPageWikiLink Liostracinidae.
- Asaphida wikiPageWikiLink Loganellidae.
- Asaphida wikiPageWikiLink Nileidae.
- Asaphida wikiPageWikiLink Order_(biology).
- Asaphida wikiPageWikiLink Parabolinoididae.
- Asaphida wikiPageWikiLink Pterocephalidae.
- Asaphida wikiPageWikiLink Ptychaspididae.
- Asaphida wikiPageWikiLink Pygidium.
- Asaphida wikiPageWikiLink Raphiophoridae.
- Asaphida wikiPageWikiLink Remopleurididae.
- Asaphida wikiPageWikiLink Remopleuridoidea.
- Asaphida wikiPageWikiLink Richard_Fortey.
- Asaphida wikiPageWikiLink Russia.
- Asaphida wikiPageWikiLink Saint_Petersburg.
- Asaphida wikiPageWikiLink Saukiidae.
- Asaphida wikiPageWikiLink Sediment.
- Asaphida wikiPageWikiLink Silurian.
- Asaphida wikiPageWikiLink Stratum.
- Asaphida wikiPageWikiLink Suborders.
- Asaphida wikiPageWikiLink Superfamilies.
- Asaphida wikiPageWikiLink Taishunghaniidae.
- Asaphida wikiPageWikiLink Taxonomic_rank.
- Asaphida wikiPageWikiLink Trilobite.
- Asaphida wikiPageWikiLink Trinucleidae.
- Asaphida wikiPageWikiLink Trinucleioidea.
- Asaphida wikiPageWikiLink Volkhov_River.
- Asaphida wikiPageWikiLink File:Trilobite2.jpg.
- Asaphida wikiPageWikiLinkText "Asaphid".
- Asaphida wikiPageWikiLinkText "Asaphida".
- Asaphida wikiPageWikiLinkText "asaphid".
- Asaphida wikiPageWikiLinkText "trinucleioids".
- Asaphida classis Trilobite.
- Asaphida hasPhotoCollection Asaphida.
- Asaphida imageCaption "Asaphus lepidurus".
- Asaphida ordo "Asaphida".
- Asaphida ordoAuthority "Fortey & Chatterton, 1988".
- Asaphida phylum "Arthropoda".
- Asaphida regnum "Animalia".
- Asaphida subclassis Librostoma.
- Asaphida subdivision "*Anomocaroidea *Asaphoidea *Dikelokephaloidea *Remopleuridoidea *Cyclopygoidea *Trinucleioidea".
- Asaphida subdivisionRanks Taxonomic_rank.
- Asaphida wikiPageUsesTemplate Template:Div_col.
- Asaphida wikiPageUsesTemplate Template:Div_col_end.
- Asaphida wikiPageUsesTemplate Template:Italic_title.
- Asaphida wikiPageUsesTemplate Template:Reflist.
- Asaphida wikiPageUsesTemplate Template:Taxobox.
- Asaphida subject Category:Cambrian_first_appearances.
- Asaphida subject Category:Cambrian_trilobites.
- Asaphida subject Category:Ordovician_trilobites.
- Asaphida subject Category:Silurian_extinctions.
- Asaphida subject Category:Silurian_trilobites.
- Asaphida subject Category:Trilobites.
- Asaphida type Animal.