Artiopoda - Agnostida - Metagnostidae
Alternative combinations: Arthrorhachis longicollis, Geragnostus longicollis
Full reference: P. E. Raymond. 1925. Some trilobites of the lower Middle Ordovician of eastern North America. Bulletin of the Museum of Comparative Zoölogy at Harvard College 67(1):1-180
Belongs to Geragnostus (Novoagnostus) according to R. A. Fortey et al. 2024
See also Raymond 1925 and Whittington 1965
Sister taxon: Geragnostus (Novoagnostus) contractus
Type specimen: YPM 13054, a pygidium
Ecology: slow-moving epifaunal detritivore
Distribution:
• Chazyan of Canada (2: Newfoundland and Labrador collections)
• Whiterockian of Canada (3: Newfoundland and Labrador)
• Ordovician of Canada (1: Northwest Territories), China (1), United States (1: California)
Total: 8 collections each including a single occurrence
Specimen images are retrieved through the ePANDDA API.
Click image to enlarge. Click to access iDigBio record.