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Dino Codex
SyntarsusAI image
AI imageCreated with GPT Image 2 by OpenAI on Nov 2, 2026

Match 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

Carnivore

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.

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