dinochecker
Welcome to our EOBRONTOSAURUS entry...
Archived dinosaurs: 788
fbtwitg+feed
Dinosaurs from A to Z
Click a letter to view...
A B C D E F G
H I J K L M N
O P Q R S T U
V W X Y Z ?

EOBRONTOSAURUS

a probable synonym of Brontosaurus from the Late Jurassic of North America.
brontosaurus.png
Pronunciation: EE-o-BRON-to-SOR-us
Meaning: Dawn Thunder Lizard
Author/s: Bakker (1998)
Synonyms: Apatosaurus yahnahpin
First Discovery: Wyoming, USA
Chart Position:

Eobrontosaurus yahnahpin

As payback on behalf of a much-loved dinosaur called Brontosaurus that was sunk as a synonym of Apatosaurus way back in 1903, Eobrontosaurus (dawn Brontosaurus), first described in 1994 as Apatosaurus yahnahpin by James Filla and Patrick Redman who affectionately referred to it as "Bertha", suffered a similar fate. A re-evaluation of its remains by Bob Bakker—who took the loss of Brontosaurus particularly badly—found them to belong to a critter more primitive than Apatosaurus, possibly directly ancestral, and he honored Brontosaurus when he coined the new generic name in 1998.

In 2004 rumours began to circulate that Eobrontosaurus was "probably" synonomous with Camarasaurus based on nothing more than the words and figures from the original description. A trip to Glen Rock to re-analyse the actual physical remains revealed that the "long neck rib" which would've excluded it from Diplodocidae was actually a fragmentary ilium (hip bone) and not only is Eobrontosaurus yahnahpin a bona-fide apatosaurine diplodocid but its species epithet (see etymology) is a misnomer.

Coming full circle, Emanuel Tschopp resurrected the original Brontosaurus as a valid critter in 2015, and raised two more species. Unfortunately, one of them is Brontosaurus yahnahpin. Recognize the epithet? Yup, it mercilessly snaffled the remains of the critter that Bakker had named in its honour, so Eobrontosaurus yahnahpin is no more.
Etymology
Eobrontosaurus is derived from the Greek "eos" (dawn) and Brontosaurus (from the Greek "bronte" (thunder) and "sauros" lizard) - the original generic name of Apatosaurus excelsus.
The species epithet, yahnahpin (pronounced wah-nah-pae), is derived from "mah-koo yah-nah-pin" which means "breast necklace" in the language of the Lakota Sioux who lived in this area. This breast necklace is actually a series of hair pipes worn by the tribe which were thought to resemble this critters long neck ribs.
Discovery
Affectionately called "Bertha" the Eobrontosaurus holotype (TATE-001) - a relatively complete postcranial skeleton - was discovered in the lower Morrison Formation of Wyoming. A skull from the the Tate Museum's "Nail" Quarry may (but probably doesn't) belong here.
Estimations
Timeline:
Era: Mesozoic
Epoch: Late Jurassic
Stage: Kimmeridgian
Age range: 156-151 mya
Stats:
Est. max. length: 21 meters
Est. max. hip height: ?
Est. max. weight: 18 tons
Diet: Herbivore
References
• J.A. Filla and P.D. Redman (1994) "Apatosaurus yahnahpin: a preliminary description of a new species of diplodocid dinosaur from the Late Jurassic Morrison Formation and Cloverly Formation of the western United States".
• R.T. Bakker (1998) "Dinosaur mid-life crisis: the Jurassic-Cretaceous transition in Wyoming and Colorado."
• P. Upchurch, P.M. Barrett and P. Dodson (2004) "Sauropoda" in Weishampel, Dodson and Osmólska (eds.) "The Dinosauria: Second Edition".
• Thomas R. Holtz, Jr. (2007) "Dinosaurs: The Most Complete, Up-to-Date Encyclopedia for Dinosaur Lovers of All Ages". /uk.
Email    Facebook    Twitter    Google+    Stumbleupon    Reddit    Pinterest    Delicious
Time stands still for no man, and research is ongoing. If you spot an error, or want to expand, edit or add a dinosaur, please use this form. Go here to contribute to our FAQ.
All dinos are GM free, and no herbivores were eaten during site construction!
To cite this page:
Atkinson, L. "EOBRONTOSAURUS :: from DinoChecker's dinosaur archive".
›. Web access: 30th Mar 2017.
  top