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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 Trilobite.
- Asaphida class Librostoma.
- Asaphida kingdom Animal.
- Asaphida phylum Arthropod.
- Asaphida thumbnail Asaphus.jpg?width=300.
- Asaphida wikiPageID "1044533".
- Asaphida wikiPageRevisionID "556846598".
- 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 subject Category:Cambrian_trilobites.
- Asaphida subject Category:Ordovician_trilobites.
- Asaphida subject Category:Silurian_trilobites.
- Asaphida subject Category:Trilobites.
- Asaphida type Animal100015388.
- Asaphida type Arthropod101767661.
- Asaphida type CambrianTrilobites.
- Asaphida type Invertebrate101905661.
- Asaphida type LivingThing100004258.
- Asaphida type Object100002684.
- Asaphida type OrdovicianTrilobites.
- Asaphida type Organism100004475.
- Asaphida type PhysicalEntity100001930.
- Asaphida type SilurianTrilobites.
- Asaphida type Trilobite101768244.
- Asaphida type Trilobites.
- Asaphida type Whole100003553.
- Asaphida type Animal.
- Asaphida type Eukaryote.
- Asaphida type Species.
- Asaphida type Organism.
- Asaphida comment "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.".
- Asaphida label "Asaphida".
- Asaphida label "Asaphida".
- Asaphida label "Asaphida".
- Asaphida label "Asaphida".
- Asaphida label "Asaphida".
- Asaphida label "Asaphida".
- Asaphida label "櫛虫目".
- Asaphida sameAs Asaphida.
- Asaphida sameAs Asaphida.
- Asaphida sameAs Asaphida.
- Asaphida sameAs Asaphida.
- Asaphida sameAs m.04139z.
- Asaphida sameAs Q220877.
- Asaphida sameAs Q220877.
- Asaphida sameAs Asaphida.
- Asaphida wasDerivedFrom Asaphida?oldid=556846598.
- Asaphida depiction Asaphus.jpg.
- Asaphida isPrimaryTopicOf Asaphida.
