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- Harpetida abstract "Harpetida is one of the nine orders of the extinct arthropod class Trilobita. The first harpetid trilobites appear in the Upper Cambrian, and the last species die out at the end of the Devonian period.Harpetid trilobites are characterized among trilobites by bearing a comparatively large, semicircular brim around the cephalon (head) which is often perforated by small pores. This brim is thought to serve as a filter-feeding apparatus. The brim stretches backward on either side of the cephalon (head) and typically has a pronounced suture along the outside.The compound eyes are typically reduced to small tubercles, though they have strong ridges stretching to the glabella (central region of the cephalon). They also typically have 12 or more thoracic segments. The pygidia are usually small.The families of Harpetida were formerly included in the order Ptychopariida, but were recently given their own order (Ebach & McNamara 2002). The subclass Librostoma was erected in 1990 by Richard Fortey to cover the various orders originally placed within Ptychopariida. The name \"Harpidae\" was once used as the name for the trilobite family containing the type genus Harpes. However, this is in conflict with the use of the same name for a family of extant molluscs and that taxon had precedence.".
- Harpetida class Librostoma.
- Harpetida class Trilobite.
- Harpetida kingdom Animal.
- Harpetida phylum Arthropod.
- Harpetida thumbnail Harpetidae_species_trilobite.jpg?width=300.
- Harpetida wikiPageExternalLink ordharpetida.htm.
- Harpetida wikiPageID "971845".
- Harpetida wikiPageLength "2310".
- Harpetida wikiPageOutDegree "26".
- Harpetida wikiPageRevisionID "696453391".
- Harpetida wikiPageWikiLink Animal.
- Harpetida wikiPageWikiLink Arthropod.
- Harpetida wikiPageWikiLink Cambrian.
- Harpetida wikiPageWikiLink Category:Cambrian_first_appearances.
- Harpetida wikiPageWikiLink Category:Harpetida.
- Harpetida wikiPageWikiLink Category:Late_Devonian_extinctions.
- Harpetida wikiPageWikiLink Category:Trilobite_orders.
- Harpetida wikiPageWikiLink Cephalon_(arthropod_head).
- Harpetida wikiPageWikiLink Class_(biology).
- Harpetida wikiPageWikiLink Devonian.
- Harpetida wikiPageWikiLink Entomaspididae.
- Harpetida wikiPageWikiLink Extinction.
- Harpetida wikiPageWikiLink Family_(biology).
- Harpetida wikiPageWikiLink Harpetidae.
- Harpetida wikiPageWikiLink Harpididae.
- Harpetida wikiPageWikiLink Librostoma.
- Harpetida wikiPageWikiLink Mollusca.
- Harpetida wikiPageWikiLink Morocco.
- Harpetida wikiPageWikiLink Order_(biology).
- Harpetida wikiPageWikiLink Ptychopariida.
- Harpetida wikiPageWikiLink Pygidium.
- Harpetida wikiPageWikiLink Richard_Fortey.
- Harpetida wikiPageWikiLink Trilobite.
- Harpetida wikiPageWikiLink File:Harpes_perradiatus_fossil_trilobite_(Devonian,_Morocco).jpg.
- Harpetida wikiPageWikiLinkText "Harpetida".
- Harpetida wikiPageWikiLinkText "harpetid".
- Harpetida wikiPageWikiLinkText "harpetids".
- Harpetida classis Trilobite.
- Harpetida imageCaption "A Harpetida trilobite from Morocco.".
- Harpetida imageWidth "240".
- Harpetida name "Harpetida".
- Harpetida ordo "Harpetida".
- Harpetida phylum "Arthropoda".
- Harpetida regnum "Animalia".
- Harpetida subclassis Librostoma.
- Harpetida subdivision "*Entomaspididae *Harpetidae *Harpididae".
- Harpetida subdivisionRanks Family_(biology).
- Harpetida wikiPageUsesTemplate Template:Refimprove.
- Harpetida wikiPageUsesTemplate Template:Taxobox.
- Harpetida wikiPageUsesTemplate Template:Trilobites.
- Harpetida subject Category:Cambrian_first_appearances.
- Harpetida subject Category:Harpetida.
- Harpetida subject Category:Late_Devonian_extinctions.
- Harpetida subject Category:Trilobite_orders.
- Harpetida hypernym Orders.
- Harpetida type Animal.
- Harpetida type Eukaryote.
- Harpetida type Species.
- Harpetida type Thing.
- Harpetida type Q19088.
- Harpetida type Q729.
- Harpetida comment "Harpetida is one of the nine orders of the extinct arthropod class Trilobita. The first harpetid trilobites appear in the Upper Cambrian, and the last species die out at the end of the Devonian period.Harpetid trilobites are characterized among trilobites by bearing a comparatively large, semicircular brim around the cephalon (head) which is often perforated by small pores. This brim is thought to serve as a filter-feeding apparatus.".
- Harpetida label "Harpetida".
- Harpetida sameAs Q2748371.
- Harpetida sameAs Harpètid.
- Harpetida sameAs Harpetida.
- Harpetida sameAs Harpetida.
- Harpetida sameAs Harpetida.
- Harpetida sameAs m.03vkfn.
- Harpetida sameAs Harpetida.
- Harpetida sameAs Q2748371.
- Harpetida wasDerivedFrom Harpetida?oldid=696453391.
- Harpetida depiction Harpetidae_species_trilobite.jpg.
- Harpetida isPrimaryTopicOf Harpetida.
- Harpetida name "Harpetida".