Cephalopoda - Ammonitida - Hildoceratidae
Alternative combinations: Ammonites subplanatus, Harpoceras (Harpoceras) subplanatum, Polyplectus subplanatus
Synonym: Ammonites complanatus d'Orbigny 1846 [replaced name]
Belongs to Harpoceras according to M. Benzaggagh et al. 2022
See also Bécaud 2006, d'Orbigny 1846, Guex 1972, Howarth 1992, Imlay 1968, Kovács 2011, Oppel 1857 and Stevens 2007
Sister taxa: Harpoceras (Harpoceras), Harpoceras crassefalcatum, Harpoceras dynastes, Harpoceras eseri, Harpoceras falciferum, Harpoceras ignobile, Harpoceras kobelli, Harpoceras lunula, Harpoceras nitescens, Harpoceras pseudoserpentinum, Harpoceras rauracum, Harpoceras serpentinum, Harpoceras (Harpoceratoides) connectens
Average measurements (in mm): diameter 170.0, shell diameter 102.9
Distribution:
• Jurassic of Canada (10: British Columbia collections), Chile (2), France (17), Hungary (2), Italy (2), Morocco (4), New Zealand (2), Spain (6), the United Kingdom (1)
Total: 46 collections each including a single occurrence
Specimen images are retrieved through the ePANDDA API.
Click image to enlarge. Click to access iDigBio record.