Alalcomenaeus cambricus Simonetta
Middle Cambrian
Burgess Shale
British Columbia, Canada

Extremely high quality 26mm rarely seen Burgess Shale arthropod. Slab length 100mm. The phylogeny of Alalcomenaeus has been the subject of debate. It has been placed within the Opabiniids until more recently when it was placed close to Leanchoilia.

See: Briggs, D.E.G.; Collins, D. (1999), “The Arthropod Alalcomenaeus cambricus Simonetta, from the Middle Cambrian Burgess Shale of British Columbia”, Palaeontology, 42 (6): 953–977