AI imageMatch with prompt
100% (7/7 items)
See the checklist, prompt and sources
- ✓Bipedal, back horizontal, tail held straight out off the ground
- ✓Mouth closed, lips covering the teeth so none are visible
- ✓Palms facing each other, not turned down or dangling
- ✓Three weight-bearing toes on each foot
- ✓Whole animal visible in side view
- ✓Scene matches the period and the fossil site
- ✓No text, people or modern objects
Checked by Claude (AI) on Nov 2, 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 Syntarsus, a carnivore Theropoda dinosaur from Rhaetian–Pliensbachian times (205.7–184.2 million years ago). Bipedal with the back held roughly horizontal and the tail held straight out behind for balance, never dragging on the ground. NOT standing upright like a kangaroo. Mouth closed with all teeth fully hidden behind scaly lips, like a monitor lizard. NO visible teeth. Hands held tucked in near the chest with the palms facing inward toward each other, like clapping, claws curving inward and forward. NOT hanging down, NOT palms-down, NOT claws pointing at the ground. Reference: Syntarsus is a generic name that has been used for the following taxa:Syntarsus a junior synonym of the Colydiinae beetle genus Cerchanotus Erichson, 1845. Syntarsus kayentakatae is the former name of a theropod dinosaur later classified as Megapnosaurus, but is now not definitively assigned to any specific genus. Syntarsus rhodesiensis is the former name of a theropod dinosaur later classified as Megapnosaurus. Anatomy: three main weight-bearing toes on each foot. Full body in side view, whole animal visible, standing in a Jurassic landscape with conifers, cycads, ginkgoes and ferns, 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
Syntarsus
There is no write-up for this dinosaur yet, but the scientific data below is complete.
Who lived alongside it
Dinosaurs found in the same rock formation as Syntarsus (Kayenta, Elliot), so they lived in the same region at roughly the same time.

Scutellosaurus

Dilophosaurus

Sarahsaurus

Kayentavenator

Massospondylus

Lesothosaurus

Melanorosaurus

Heterodontosaurus
Formation data from the Paleobiology Database, counting only each genus's main formations. One formation can span hundreds of thousands to millions of years, so this doesn't mean any two of them ever met.
Scientific details
- Classification
- Theropod (two-legged predators)
- Family
- Unknown
- When it lived
- 184.2–205.7 million years ago
- Geologic stages
- Rhaetian – Pliensbachian
- Named by
- Raath, 1969
- Fossil occurrences
- 11 sites
Countries with fossils
- United States
- South Africa
Data from Paleobiology Database and Wikidata