Metriorhynchus: 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
Metriorhynchus
Metriorhynchus geoffroyii (Metriorhynchus · Metriorhynchus)
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
- 💡 While crocodiles seen in zoos are semi-aquatic animals living along watersides, the Metriorhynchus group was a crocodyliform lineage adapted to living out in the open sea away from land (Comparison).
- 💡 Although the genus was named back in the 19th century, new papers continue to appear even in 2026, showing how fossil taxonomy is continually revised rather than fixed.
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
Metriorhynchus geoffroyii (genus Metriorhynchus) represents a family of marine crocodyliforms (Metriorhynchidae) that lived in Jurassic seas. This group is regarded as the only crocodyliform lineage to have fully adapted to life in the open ocean.
🦴 2. Anatomy & Morphology
Studies explain that slender-, long-snouted forms within this group had tooth structures well suited for catching fish or squid-like cephalopods.
🔍 3. Fossil Record & Paleoecology
According to PBDB records, it was a marine carnivore that swam and hunted in the sea. The scope of the genus is still being revised, with a 2026 paper re-examining the definition of the genus based on specimens from Normandy, France.
🇰🇷 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
- • wikidata.org — Q137865273
- • pmc.ncbi.nlm.nih.gov — PMC3210659
- • pmc.ncbi.nlm.nih.gov — PMC13608419
- • Silhouette: PhyloPic — Gareth Monger · CC BY 3.0
Recorded dimensions are widely cited representative estimates from public literature and may vary by study or specimen.