Naraoiidae


Naraoiidae
Naraoiidae
Temporal range: CambrianSilurian
Naraoia spinosa
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Trilobita†
Order: Nectaspida
Family: Naraoiidae
Walcott, 1912
Genera

Misszhouia
Naraoia

The Naraoiidae is a family of soft-shelled trilobite-like arthropods that are known only from the early and middle Cambrian -- primarily from the Burgess Shale of British Columbia and the Maotianshan Shale of China.

The taxonomic placement of the Naraoiidae is uncertain; Naraoiids are similar to trilobites in many ways but have several peculiar features unlike those of other trilobite groups, primarily their unmineralized exoskeleton and unsegmented shields. Some specialists consider the Naraoiidae true trilobites of the order Nectaspida, others consider them trilobites of uncertain ordinal status, and still others consider them a separate group of non-trilobite arthropods.

Tegopelte fossil at the Geological Museum in Copenhagen

There are several known genera, of which Naraoia was the first to be described and is the most widely known. The species Naraoia naraoia has an entirely unmineralized body covering and unsegmented head and body shields. Its maximum size is about 4 cm. A second softbodied trilobite - Tegopelte - is known from the same formations and is sometimes placed in the Naraoiidae, or is sometimes in its own family, the Tegopeltidae.

External links


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Look at other dictionaries:

  • Naraoiidae — Naraoia spinosa Zeitraum Kambrium bis Silur Fundorte Burgess Schiefer, Kanada Chengjiang Faunengemeinschaft, Volksrepublik China Systematik …   Deutsch Wikipedia

  • Naraoiidae — Naraoia …   Wikipédia en Français

  • Misszhouia — Zeitraum Unteres Kambrium Fundorte Chengjiang Faunengemeinschaft,Yunnan, Volksrepublik China Systematik …   Deutsch Wikipedia

  • Naraoia — spinosa …   Wikipédia en Français

  • Nectaspida — Taxobox name = Nectaspida image caption = Naraoia spinosa fossil range = Cambrian to Silurian regnum = Animalia phylum = Arthropoda classis = Trilobita dagger; ordo = Nectaspida dagger; ordo authority = Raymond, 1920 subdivision ranks = Families… …   Wikipedia

  • Arachnomorpha — Taxobox name = Arachnomorpha image width = 250px image caption = Arachnida from Ernst Haeckel s Kunstformen der Natur , 1904 fossil range = Cambrian Present Day regnum = Animalia phylum = Arthropoda unranked classis = Arachnomorpha subdivision… …   Wikipedia

  • Naraoia — Temporal range: Cambrian Naraoia spinosa Scientific classification Kingdom …   Wikipedia

  • Misszhouia — longicaudata Temporal range: Cambrian Scientific classification Kingdom: Animalia …   Wikipedia

  • Chengjiang-Faunengemeinschaft — Maotianshania cylindrica aus der Chengjiang Faunengemeinschaft Die Chengjiang Faunengemeinschaft (澄江动物群 Chéngjiāng dòngwùqún) ist eine unterkambrische Konservatlagerstätte. Sie ist eingebettet in die Maotianshan Schiefer der Provinz Yunnan… …   Deutsch Wikipedia

  • Kaili-Fauna — Die Kaili Fauna (凯里生物群 Kǎilǐ shēngwù qún), auch Kaili Biota oder Kaili Faunengemeinschaft, ist eine mittelkambrische Konservatlagerstätte vom Burgess Schiefer Typus. Sie stammt aus dem mittleren Abschnitt der Kaili Formation aus der Provinz… …   Deutsch Wikipedia


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