AI imageNote: This dinosaur is known from only part of a skeleton. The image fills in the missing parts from close relatives, so the real animal may have looked quite different.
Match with prompt
89% (8/9 items)
Where the image differs from the prompt
- Hands dangle with claws pointing downShould be: Palms facing each other, not turned down or dangling
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 visibleMouth closed, but the lip line is clearly visible
- ✕Palms facing each other, not turned down or danglingHands dangle with claws pointing down
- ✓Three weight-bearing toes on each foot
- ✓Long, low, narrow skull, not broad and deep like T. rex
- ✓About 8 m long, short three-fingered arms, small scales
- ✓Whole animal visible in side view
- ✓Scene matches the period and the fossil sitePalm-like trees may not have existed yet at this time
- ✓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 Siamraptor, a carnivore Carcharodontosauridae dinosaur from Aptian times (121.4–113.2 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. A long, low, narrow skull with blade-like teeth, NOT the broad deep skull of Tyrannosaurus. Reference: Siamraptor is an extinct genus of carcharodontosaurian dinosaur, containing the single species S. suwati, known from the Khok Kruat Formation of Thailand. It is the first definitive named carcharodontosaurian species known from Southeast Asia. Anatomy: hands held with palms facing each other (not pronated, not palms-down, not dangling); three main weight-bearing toes on each foot; a large animal about 8 meters long, short arms with three clawed fingers, powerful hind legs, skin of small scales. Full body in side view, whole animal visible, standing in an Early Cretaceous floodplain like the Khok Kruat Formation of northeastern Thailand, warm and semi-arid with conifers, cycads, ferns and rare early flowering plants, no grass. 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
Siamraptor
Name meaning: Means "Siam's thief" or "hunter of Siam".
📏 Estimated at around 8 m long, longer than a medium-sized bus.
📐 Compare its size with other dinosaurs →Find it in a game
In Cretaceous Survival, Khok Kruat Formation · opens the game at play.dinocodex.com
Play as Siamraptor
Siamraptor was a large carcharodontosaurian predator found in Nakhon Ratchasima province, and one of the biggest meat-eaters ever discovered in Thailand.
Fun facts
- Siamraptor fossils come from several individuals mixed together, which helped scientists piece together much of its body.
- It belongs to the same group as Carcharodontosaurus, which included some of the largest land predators of their time.
Who lived alongside it
Dinosaurs found in the same rock formation as Siamraptor (Khok Kruat), so they lived in the same region at roughly the same time.
Nagatitan
Ratchasimasaurus
Siamodon
Sirindhorna
Psittacosaurus
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
- 113.2–121.4 million years ago
- Geologic stages
- Aptian
- Named by
- Chokchaloemwong et al., 2019
- Fossil occurrences
- 1 sites
🦴 Known fossil material
Parts found as fossils
- Skull
- Lower jaw
- Neck vertebrae
- Back vertebrae
- Tail vertebrae
Holotype: the back of a right lower jaw. Isolated bones from the same site, such as skull pieces and vertebrae, have been referred to it. Referred limb and hip pieces (a hand claw, part of a shin bone, a toe bone and two partial ischia) are not shown.
Note: this genus, or which bones belong to it, is still debated.
Coloured areas are parts of the skeleton with fossil bones found so far (sometimes just one bone in that area); faint areas have not been found. The outline is a general shape for its group, not this dinosaur's real body.
Compiled from published descriptions; not yet checked against the original papers by a specialist. Sources: Wikipedia (en): Siamraptor
Countries with fossils
- Thailand
Data from Paleobiology Database and Wikidata