Artiopoda - Phacopida - Cheiruridae
Alternative combinations: Cheirurus perforator, Nieszkowskia perforator
Synonyms: Kawina unicornica Hintze 1953, Xystocrania unicornica Hintze 1953
Full reference: E. Billings. 1865. Palaeozoic fossils, volume 1. Geological Survey of Canada 1-426
Belongs to Xystocrania according to R. J., Jr. Ross 1970
See also Billings 1865, Hintze 1953, Raymond 1925, Tremblay and Westrop 1991 and Whittington 1965
Sister taxa: Xystocrania glaucus, Xystocrania pyriformis
Type specimens:
- Xystocrania perforator: GSC 684, a cephalon/head (cranidium)
- Kawina unicornica: 26507 (AMNH), an exoskeleton (cranidium).
Ecology: fast-moving low-level epifaunal carnivore
Distribution:
• Whiterockian of Canada (7: Newfoundland and Labrador, Northwest Territories collections)
• Chazyan of Canada (1: Newfoundland and Labrador)
• Ordovician of United States (3: Nevada, Utah)
Total: 11 collections each including a single occurrence
Specimen images are retrieved through the ePANDDA API.
Click image to enlarge. Click to access iDigBio record.