🪐 View in 3D Galaxy 📏 View on 3D Scale Stage

🧬 Biological Classification (Kingdom to Species)Apatosaurus ajax

Kingdom

Animalia

Phylum

Chordata

Class

Saurischia

Order

Family

Diplodocidae

Genus

Apatosaurus

Species

Apatosaurus ajax

📏 True-scale comparison (1 m = 1 m) against a 1.75 m humanLength 21m

· 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.
· Apatosaurus silhouette: PhyloPic — Elihu Guzmán Arroyo · CC BY 4.0
· Human silhouette: PhyloPic — NASA · Public Domain Mark 1.0

• Length vs. 1.75 m human: 12× Compare with other species →

Saurischia🌿 Herbivore

Apatosaurus

Apatosaurus ajax (Apatosaurus · Apatosaurus)

🛡️ Conservation Status (IUCN Red List)FOSSIL (Extinct Fossil)

Known only from fossils. The IUCN Red List assesses only species extant since 1500 CE, so fossil taxa are not assigned a category.

Geological Era

Late Jurassic (~154.8 MYA)

Diet

Herbivore

Length · Height

21m · No data

Mass · Top Speed

No data · No data

Habitat & Fossil Locality

Late Jurassic Morrison Formation in the United States (semi-arid region with forests and rivers)

💡 Everyday Comparisons for Size, Mass & Speed

💡 Its body length of about 21 m (genus representative value, estimated) is just under the length of two city buses (about 12 m each) (Comparison).
💡 The Natural History Museum, London notes that a 2015 study regards Brontosaurus as a distinct animal closely related to Apatosaurus.

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.

#아파토사우루스#Apatosaurus ajax

📖 1. Overview

Apatosaurus ajax is a giant herbivorous sauropod that lived in North America during the Late Jurassic. Its genus name Apatosaurus means 'deceptive lizard', because some of its bones looked like those of marine reptiles to the scientist who first named it.

🦴 2. Anatomy & Morphology

Its long, slender tail may have been used like a whip. Its body length is recorded as about 21 m.

🔍 3. Fossil Record & Paleoecology

It grew rapidly to adult size in about 10 years, and its huge size and herd living would have helped deter predators. It lived alongside Stegosaurus, Diplodocus, and Allosaurus.