• ✓Very long neck held forward and roughly horizontal, not upright
• ✓Extremely long whip-like tail held off the ground
• ✓Pillar-like legs, front legs slightly shorter, a single front claw
• ✓Slender body, long low head
• ✓Whole animal visible in side viewTail tip touches the image edge
• ✓Scene matches the period and the fossil site
• ✓No text, people or modern objects

Checked by Claude Opus 5.5 (checked item by item from the image) on Oct 28, 2026. The score is the share of checklist items the image gets right; it is not an expert scientific review.

Prompt used to create the image

Scientifically accurate paleoart of Diplodocus, a herbivore Diplodocidae dinosaur from the Late Jurassic (about 154–152 million years ago). A very long neck held roughly horizontal, extending forward rather than straight up. An extremely long, whip-like tail held off the ground. Reference: Diplodocus is an extinct genus of diplodocid sauropod dinosaurs known from the Late Jurassic of North America and Europe. The first fossils of Diplodocus were discovered in 1877 by S. W. Williston. The generic name, coined by Othniel Charles Marsh in 1878, is a Neo-Latin term derived from Greek διπλός (diplos) "double" and δοκός (dokos) "beam", in reference to the double-beamed chevron bones located in the underside of the tail, which were then considered unique. Anatomy: pillar-like legs with the front legs slightly shorter than the hind legs, front feet with a single thumb claw; a slender body and a long, low head. Full body in side view, whole animal visible, standing in a semi-arid Late Jurassic floodplain like the Morrison Formation of western North America, with conifers, cycads, ginkgoes, tree ferns and ferns along a river, no grass and no flowering plants. Natural history museum illustration style, realistic textures and natural daylight, muted natural colors. No text, no labels, no humans, no modern objects.

Facts in the prompt come from Wikipedia (en) and Paleobiology Database