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Temporal range: Floian
Gyrometopus lineatus.jpg
Gyrometopus lineatus
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Trilobita
Order: Phacopida
Suborder: Phacopina
Superfamily: Dalmanitoidea
Family: Diaphanometopidae
Genus: Gyrometopus
Jaanusson 1975
  • G. lineatus (Angelin, 1854)

Gyrometopus is an extinct genus from a well-known class of fossil marine arthropods, the trilobites. It lived during the Arenig stage of the Ordovician Period, approximately 479 to 472 million years ago.[1]


Gyrometopus lineatus, is found in the Lower Ordovician (Floian) of Sweden (Stora Stola, Timmerdala, Västergötland).[2]

Relations with other Phacopina[edit]

Gyrometopus is probably close to the common ancestor of the Phacopina. Gyrometopus is phacopid in appearance, but its cephalic doublure is crossed left and right by sutures that define a rostral plate, unlike in other Phacopina.[3]


  1. ^ Sepkoski, Jack (2002). "A compendium of fossil marine animal genera (Trilobita entry)". Bulletins of American Paleontology 364: p.560. Retrieved 2008-01-12. 
  2. ^ "Per Hansson´s trilobite gallery - Trilobites from Sweden". 
  3. ^ Jaanusson, V. Evolutionary processes leading to the trilobite suborder Phacopina. Fossils and Strata 4:209–218, fig. 1–5. 1975