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Sphaeragnostus is an extinct genus from a well-known class of fossil marine arthropods, the trilobites. It can be recognized by having two thorax segments, a totally effaced headshield (or cephalon), while the tailshield (or pygidium) although effaced, has a clear furrow parallel to its border, and a short, convex, subcircular axis. It lived during the Ordovician (upper Tremadoc to Ashgill).

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  • Sphaeragnostus is an extinct genus from a well-known class of fossil marine arthropods, the trilobites. It can be recognized by having two thorax segments, a totally effaced headshield (or cephalon), while the tailshield (or pygidium) although effaced, has a clear furrow parallel to its border, and a short, convex, subcircular axis. It lived during the Ordovician (upper Tremadoc to Ashgill). (en)
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  • 868333833 (xsd:integer)
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dbp:classis
dbp:familia
  • Sphaeragnostidae (en)
dbp:familiaAuthority
  • Kobayashi, 1939 (en)
dbp:genus
  • Sphaeragnostus (en)
dbp:genusAuthority
  • Howell & Resser in Cooper & Kindle, 1936 (en)
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  • Sphaeragnostus cingulatus, linedrawing (en)
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  • 0.500000 (xsd:double)
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dbp:phylum
  • Arthropoda (en)
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  • Animalia (en)
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  • * S. similaris ( ) synonym Agnostus similaris * S. cingulatus synonym Agnostus cingulatus, S. cerus, S. gaspensis europeensis, S. subcircularis * S. gaspensis gaspensis (Howell & Resser in Cooper & Kindle, 1936) * S. gaspensis quxianensis (Ju in Qiu et al, 1983) * S. nudatus (Koroleva, 1982) * S. orientalis (Petrunina) (en)
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  • Sphaeragnostus is an extinct genus from a well-known class of fossil marine arthropods, the trilobites. It can be recognized by having two thorax segments, a totally effaced headshield (or cephalon), while the tailshield (or pygidium) although effaced, has a clear furrow parallel to its border, and a short, convex, subcircular axis. It lived during the Ordovician (upper Tremadoc to Ashgill). (en)
rdfs:label
  • Sphaeragnostus (en)
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