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ANTRODEMUS

a synonym of Allosaurus fragilis from the the Late Jurassic of North America.
Antrodemus
Pronunciation: an-tro-DEE-muss
Meaning: Chamber bodied
Author/s: Leidy (1870)
Synonyms: None known
First Discovery: Colorado, USA
Chart Position:

Antrodemus valens

In 1869, a partial tail vertebra was hauled from Colorado's Morrison Formation by Ferdinand Hayden and a year later it became Poicilopleuron valens — a misspelled second species of the European Poekilopleuron — courtesy of Joseph Leidy. However, the usually sure-footed Leidy dithered on this occasion and had craftily attached a footnote to the official description requesting that Po.valens be known as Antrodemus if it was proven not to be Poekilopleuron. And so it came to pass.

When Gilmore fully described Marsh's 1877-named Allosaurus in 1920, he argued that features of its vertebrae made it indistinguishable from Antrodemus. Thus, Leidy's critter should have priority as it trumped Allosaurus by a good seven years. But both names ran a relay of inter-changing through the literature for over half a century until James Madsen turned up in 1976, flexing his pen.

Given the flippant disregard of the "first name stands rule" down the years, no-one was surprised when Madsen struck Antrodemus from the dinosaur register in favour of everyone's favourite Jurassic carnivore. The irony is; the holotype of Allosaurus fragillis is extremely fragmentary, so the name is technically dubious, and as such it lacks the structural integrity required to support an entire genus. In an attempt to remedy this situation, Greg Paul and Kenneth Carpenter submitted a petition to the ICZN in 2010 requesting that the name Allosaurus fragillis be officially transferred to a better specimen. We sympathise with Antrodemus. And Manospondylus too.
Estimations
Timeline:
Era: Mesozoic
Epoch: Late Jurassic
Stage: Kimmeridgian
Age range: 156-151 mya
Stats:
Est. max. length: 12 meters
Est. max. hip height: 3 meters
Est. max. weight: 2.5 tons
Diet: Carnivore
References
• Joseph Leidy (1870) "Remarks on Poicilopleuron valens, Clidastes intermedius, Leiodon proriger, Baptemys wyomingensis, and Emys stevensonianus".
• Charles Whitney Gilmore (1920) "Osteology of the carnivorous Dinosauria in the United States National museum with special reference to the genera Antrodemus (Allosaurus) and Ceratosaurus".
• James H. Madsen, Jr. (1976) "Allosaurus fragilis: A Revised Osteology".
• G.S. Paul and K. Carpenter (March 2010) "Case 3506: Allosaurus Marsh, 1877 (Dinosauria, Theropoda): proposed conservation of usage by designation of a neotype for its type species Allosaurus fragilis Marsh, 1877".
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To cite this page:
Atkinson, L. "ANTRODEMUS :: from DinoChecker's dinosaur archive".
›. Web access: 27th Mar 2017.
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