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- Els harpètids (Harpetida) són un dels nou ordres d'artròpodes extints de la classe Trilobita. Visqueren del Cambrià superior al Devonià superior. (ca)
- Harpetida is one of the eleven 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 the family of harp snails and that taxon had precedence. (en)
- Les Harpetida forment un ordre éteint de trilobites, une classe également éteinte d'arthropodes marins. (fr)
- Los harpétidos (Harpetida) son un orden de artrópodos de la clase extinta Trilobita. Aparecen en el registro fósil desde el Furongiense (Cámbrico superior) hasta el Frasniense (Devónico Superior). (es)
- Gli Harpetida sono un ordine di trilobiti comparsi nel Furongiano (Cambriano Inferiore) e si estinsero nel Frasniano (Devoniano Superiore). (it)
- Harpetida (лат.) — отряд трилобитов. Палеозойская группа: найдены в кембрийском, ордовикском, силурийском и девонском периодах. Название отряда происходит от слова «серп» (Harpe) благодаря серповидной форме щёчных рогов. (ru)
- Harpetida é uma ordem de artrópodes pertencente à classe Trilobita. O grupo surgiu no Cambriano e extinguiu-se no Devoniano. (pt)
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- A Harpetida trilobite from Morocco. (en)
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- *Entomaspididae
*Harpetidae
*Harpididae (en)
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- Els harpètids (Harpetida) són un dels nou ordres d'artròpodes extints de la classe Trilobita. Visqueren del Cambrià superior al Devonià superior. (ca)
- Les Harpetida forment un ordre éteint de trilobites, une classe également éteinte d'arthropodes marins. (fr)
- Los harpétidos (Harpetida) son un orden de artrópodos de la clase extinta Trilobita. Aparecen en el registro fósil desde el Furongiense (Cámbrico superior) hasta el Frasniense (Devónico Superior). (es)
- Gli Harpetida sono un ordine di trilobiti comparsi nel Furongiano (Cambriano Inferiore) e si estinsero nel Frasniano (Devoniano Superiore). (it)
- Harpetida (лат.) — отряд трилобитов. Палеозойская группа: найдены в кембрийском, ордовикском, силурийском и девонском периодах. Название отряда происходит от слова «серп» (Harpe) благодаря серповидной форме щёчных рогов. (ru)
- Harpetida é uma ordem de artrópodes pertencente à classe Trilobita. O grupo surgiu no Cambriano e extinguiu-se no Devoniano. (pt)
- Harpetida is one of the eleven 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. (en)
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- Harpetida (en)
- Harpètids (ordre) (ca)
- Harpetida (es)
- Harpetida (fr)
- Harpetida (it)
- Harpetida (pt)
- Harpetida (ru)
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