Artiopoda - Agnostida - Agnostidae
Alternative spelling: Geragnostus (Micragnostus)
Parent taxon: Agnostidae according to J.-S. Bao and J.B. Jago 2000
See also Lu and Lin 1989, Sepkoski 2002 and Whittington et al. 1997
Sister taxa: Acmarhachis, Agnostinae, Agnostus, Aistagnostus, Barrandagnostus, Biciragnostus, Connagnostus, Eurudagnostus, Formosagnostus, Gymnagnostus, Hadragnostus, Homagnostus, Idolagnostus, Ivshinagnostus, Kormagnostella, Kormagnostus, Kymagnostus, Lotagnostus, Neoagnostus, Oncagnostus, Oxyagnostus, Peronopsinae, Ptychagnostinae, Quadrahomagnostus, Semagnostus, Strictagnostus, Trilobagnostus
Subtaxa: Geragnostus (Micragnostus) acrolebes Geragnostus (Micragnostus) bilobus Geragnostus (Micragnostus) chengcunensis Micragnostus brevispinus Micragnostus calviformis Micragnostus calvus Micragnostus chiushuensis Micragnostus curvata Micragnostus elongatus Micragnostus insolitus Micragnostus intermedius Micragnostus mutabilis Micragnostus orientalis Micragnostus quadratiformis Micragnostus serus Micragnostus strictus Micragnostus vilonii
Type: Agnostus calvus
Ecology: slow-moving epifaunal detritivore
Distribution:
• Arenigian of France (1 collection)
• Arenig of Argentina (2), Norway (1)
• Ordovician of Argentina (1), Australia (1), Canada (1: Newfoundland and Labrador), Norway (1), the United Kingdom (4)
• Cressagian of the United Kingdom (2)
• Tremadoc of Argentina (2), Bolivia (6), Canada (7: Alberta, Northwest Territories), Mexico (23)
• Ibexian of Norway (3)
• Taoyuanian of China (8), the Russian Federation (3), South Korea (17)
• Cambrian of Argentina (23), Australia (10), Canada (13: Alberta, Newfoundland and Labrador, Yukon), China (14), Kazakhstan (44), South Korea (5), Turkey (2), the United Kingdom (2), United States (2: Wyoming)
Total: 198 collections including 213 occurrences
Specimen images are retrieved through the ePANDDA API.
Click image to enlarge. Click to access iDigBio record.