Most size estimates are based on specimen CM 3018 (the type specimen of "A. louisae"), which was long and had a mass of; past estimates have put the creature's mass as high as.
Most size estimates are based on specimen CM 3018 (the type specimen of "A. louisae"). Specimen CM 3018 (the type specimen of "A. louisae") was long. Specimen CM 3018 (the type specimen of "A. louisae") had a mass of. Past estimates have put the creature's mass as high as.