Peronopsis (meaning "broach-like" or possibly "boot-like") is a genus of trilobite restricted to the Middle Cambrian. Its remains have been found in Asia, Australia, Europe, and North America.
Etymology
The subgenus Svenax is a contraction of Sven Axel, the given names of the paleontologist Tullberg.
Taxonomy
Position of Peronopsis palmadon
Peronopsis palmadon is intermediate between Peronopsidae and Condylopygidae, but it is not clear whether P. palmadon is ancestral to the Condylopigidae, a condylopigid exhibiting regression towards ancestral characters, or an example of parallel evolution.
Species previously assigned to Peronopsis
P. acadica = Acadagnostus acadicus
P. bifidus = Pseudoperonopsis bifidus
P. bonnerensis = Pentagnostus (Meragostus) bonnerensis
P. brunfloensis = Redeagnostus brunfloensis
P. bulkurensis = Pentagnostus (Meragostus) bulkurensis
P. columbensis = Pseudoperonopsis columbensis
P. comes Resser and Erdo, 1937 = Ammagnostus laiwuensis
P. comis Öpik, 1979 = Euagnostus comis
P. crassa = Ammagnostus crassa
P. cylindrica = Quadragnostus cylindrica
P. cylindrata = Ammagnostus laiwuensis
P. ekip = Ammagnostus laiwuensis
P. evansi = Archaeagnostus evansi
P. fallax conica = Quadragnostus conica
P. fallax depressa = Quadragnostus depressa
P. fallax sinopsis = Redeagnostus ferox sinopsis
P. fallax xiaoshiwanensis = indetermined Agnostidae
P. gaspensis = Itagnostus gaspensis
P. grossus = Ammagnostus laiwuensis
P. gullini = Ammagnostus laiwuensis
P. huzhuensis = indetermined Agnostidae
P. interstricta = Itagnostus interstrictus
P. jegorovae = Ammagnostus jegorovae
P. lata = Diplorrhina lata
P. marginalis = Baltagnostus marginalis
P. maijangensis = Archaeagnostus maijangensis
P. miqueli = Baltagnostus miqueli
P. munda = Trilobagnostus munda
P. quadrata sulcata = Quadragnostus sulcata
P. quadratiformis = Ammagnostus laiwuensis
P. recta = Diplorrhina recta
P. roddyi = Eoagnostus roddyi
P. rotundatus = Quadragnostus rotundatus
P. segmenta = Pentagnostus (Meragostus) segmenta
P. shandongensis = Ammagnostus laiwuensis
P. taitzuhoensis = Itagnostus gaspensis taitzuhoensis
P. tramitis = Acadagnostus acadicus
P. ultima Poulsen, 1960 = Clavagnostus ultima
P. ultimus Ergaliev, 1980 = Pentagnostus (Meragostus) shabaktensis
Species and distribution
Subgenus Peronopsis (Peronopsis) P. integra (Beyrich, 1845) (Type), synonyms Battus integer and Mesagnostus integer, is known from the Middle Cambrian of the Czech Republic (Hydrocephalus lyelli-zone and Paradoxides gracilis-zone, Jince Formation, Bohemia) and Sweden (Paradoxides oelandicus-zone, Öland). P. amplaxis Robison, 1982 has been found in the Middle Cambrian of Central Asia and North America (Triplagnostus gibbus-zone, Nevada; House Range, Utah; Branche Cove, Newfoundland). P. batenica Bognibova, 1971 occurs in the Middle Cambrian of the Russian Federation (Eldakh Horizon, Eldakh Mountain, Betenev Range, Altai). P. crassa Lermontova, 1940 is present in the Middle Cambrian of the Russian Federation (Paradoxides forchhammeri-zone, Orlinaya Mountains, Kuznetsk Basin). P. deons Jell and Webbers, 1992 has been collected in the Middle Cambrian of Antarctica (Triplagnostus gibbus-zone, Edson Hills, Ellsworth Mountains, West Antarctica). P. hypagnostiformis Bognibova, 1971 has been found in the Middle Cambrian of the Russian Federation (Mandybashskii Horizon, Shakhmatovo, East Sayan). P. inarmata Hutchinson, 1962 occurs in the Middle Cambrian of Newfoundland, Canada (Paradoxides bennetti-zone, Avalon Peninsula). P. montis Matthew, 1889 is known from the Middle Cambrian of the Russian Federation (Kounamkites-zone, Daldyn river Basin, and Nekekit River; Ovatoryctocara-zone, Molodo River, Olenik Uplift, Yakutia; Shistocephalus antiquus-zone, Lena River), and Canada (Mount Stephen, British Columbia; Bathyuriscus-Elrathina-zone, Rocky Mountains). P. uzbekistanica Hajrullina, 1970 was excavated from the Middle Cambrian of Uzbekistan (Elrathina poletaevae-zone, Amgaian, South Tien Shan).