Repenomamus: No measured body size data available to draw at scale.
- · Grid units represent actual meters (m); human and animals are drawn to the exact same scale with original silhouette aspect ratios preserved.
- · When a size range is recorded (e.g. 1–1.6m), the lower bound is used for scale comparison.
- · Human silhouette: PhyloPic — NASA · Public Domain Mark 1.0
Repenomamus
Repenomamus giganticus (Repenomamus · Repenomamus)
Known only from fossils. The IUCN Red List assesses only species extant since 1500 CE, so fossil taxa are not assigned a category.
💡 Everyday Comparisons for Size, Mass & Speed
- 💡 Having a skull 50% longer than R. robustus means, for example, that a 10 cm skull would become 15 cm long (Comparison).
- 💡 The smaller species in the same genus, R. robustus, was about the size of a wild Virginia opossum, and the discovery of juvenile dinosaur bones in its stomach region became direct evidence that mammals ate young dinosaurs.
Reference standards: coach bus ~12 m, mid-size car ~4.9 m, compact car ~1 t, basketball hoop 3.05 m, credit card 8.56 cm.
📖 1. Overview
Repenomamus giganticus was a large mammal from the Early Cretaceous beds of Liaoning, China, with a skull 50% longer than that of the smaller species in the same genus, R. robustus. It overturned the conventional view that mammals of the dinosaur era were all the size of mice or shrews.
🦴 2. Anatomy & Morphology
It was described from a nearly complete articulated skull and skeleton; R. robustus in the same genus was about the size of a Virginia opossum, whereas this species had a skull 50% longer.
🔍 3. Fossil Record & Paleoecology
Bones of a juvenile Psittacosaurus (a horned dinosaur) were found in the stomach area of R. robustus, showing that members of this genus were carnivorous mammals that ate small vertebrates and even young dinosaurs. The larger R. giganticus is known from the same Lujiatun beds.
🇰🇷 4. Connection to Korea
No direct record connecting this species to Korea has been found.
📚 Sources & References
- • Fossil taxon — the IUCN Red List assesses only species living or extinct since 1500
- • paleobiodb.org — basicTaxonInfo
- • commons.wikimedia.org — File:Repenomamus-Paleozoological Museum of China.jpg
- • europepmc.org — 15650737
- • pmc.ncbi.nlm.nih.gov — PMC10354204
- • Silhouette: PhyloPic — Ivan Iofrida · CC BY 4.0 (Congeneric silhouette — Repenomamus robustus)
Recorded dimensions are widely cited representative estimates from public literature and may vary by study or specimen.