Open Paleo

Podokesaurus

Talbot, 1911 po-DOH-kee-SAWR-us

From Greek podoces (πόδας ὠκύς, podas okys, 'swift-footed'), meaning 'swift-footed lizard', referring to its presumed agility

201.4–192.9 million years ago Hettangian–Sinemurian, Early Jurassic
Early Jurassic stages

Podokesaurus is a genus of coelophysoid dinosaur that lived in what is now the eastern United States during the Early Jurassic Period. The first fossil was discovered by the geologist Mignon Talbot near Mount Holyoke, Massachusetts, in 1910. The specimen was fragmentary, preserving much of the body, limbs, and tail. In 1911, Talbot described and named the new genus and species Podokesaurus holyokensis based on it. The full name can be translated as "swift-footed lizard of Holyoke". This discovery made Talbot the first woman to find and describe a non-bird dinosaur. The holotype fossil was recognized as significant and was studied by other researchers, but was lost when the building it was kept in burned down in 1917; no unequivocal Podokesaurus specimens have since been discovered. It was made state dinosaur of Massachusetts in 2022.

Under dispute

Podokesaurus holyokensis is a theropod whose holotype was destroyed in a 1917 fire and cannot be rescored in modern phylogenetic analyses, so its affinities rest on the original description and later assessments rather than direct restudy. Carrano and Sampson (2004) treated it as a coelophysid in their review of Coelophysoidea, Tykoski and Rowe (2004) as Coelophysoidea incertae sedis, finding no derived characters uniting it with Coelophysis, and Bristowe and Raath (2004) listed it as a junior synonym of Coelophysis without discussion. Holtz (1994) regarded it as an indeterminate small theropod.

Diagnosis

  1. Femur slender and nearly straight with fourth trochanter at distal end, length greater than tibia only in larger forms
  2. Tibia notably longer than femur with metatarsals over half tibia length, indicating rapid bipedal locomotion
  3. Pubis remarkably long (95mm) and thin, expanded at distal end, angled 40° to vertebral column
  4. Ischium with narrow uniform shaft, well-rounded anteriorly, lacking postpubis
  5. Hollow, light skeletal construction including hollow vertebrae with transverse cavities and hollow ribs

Species

Podokesaurus holyokensis Talbot, 1911

Type species

Named for Mount Holyoke, Massachusetts, near where the holotype boulder was found, with the Latin suffix '-ensis' meaning 'of'.

Holotype
Not catalogued , Yale Peabody Museum of Natural History (destroyed)
Material
Partial skeleton in two halves of a split boulder, including humerus, shoulder elements, both femora and tibiae, left fibula, metatarsals, digits and unguals, pubis, ischium, ilium, 17 presacral and 13 caudal vertebrae, ribs, abdominal ribs, and possible skull bones.
Horizon
Portland Formation, Hettangian–Sinemurian, Early Jurassic , 201.4–192.9 million years ago
Locality
near Mount Holyoke College, Massachusetts, United States Talbot (1911) found the holotype in a boulder of sandstone that a glacier "carried two or three miles, possibly, and deposited not far from the site of Mount Holyoke College", so the locality is where the boulder came to rest rather than where the animal was buried, and the formation is an inference about the outcrop the ice quarried it from.

References

  1. Talbot, M. (1911). Podokesaurus holyokensis, a new dinosaur from the Triassic of the Connecticut Valley. American Journal of Science s4-31(186): 469-479. American Journal of Science (AJS). doi:10.2475/ajs.s4-31.186.469 talbot1911a
  2. Carrano, M. T.; Sampson, S. D. (2004). A review of coelophysoids (Dinosauria: Theropoda) from the Early Jurassic of Europe, with comments on the late history of the Coelophysoidea. Neues Jahrbuch für Geologie und Paläontologie - Monatshefte 2004(9): 537-558. doi:10.1127/njgpm/2004/2004/537

    Regarded the destroyed-holotype Podokesaurus as almost certainly an Early Jurassic coelophysoid on pelvic synapomorphies, but held little more could be said of its affinities.

    carrano2004a
  3. Tykoski, R. S.; Rowe, T. (2004). Ceratosauria. The Dinosauria, Second Edition (Weishampel, D. B.; Dodson, P.; Osmólska, H., eds.) 47-70. University of California Press, Berkeley.

    Accepted that Podokesaurus shows coelophysoid features but placed it no more precisely than Theropoda incertae sedis.

    tykoski2004a
  4. Bristowe, A.; Raath, M. A. (2004). A juvenile coelophysoid skull from the Early Jurassic of Zimbabwe, and the synonymy of Coelophysis and Syntarsus. Palaeontologia Africana.

    Listed Podokesaurus as a junior synonym of Coelophysis without discussion, implying a coelophysoid placement.

    bristowe2004a
  5. Paul, G. S. (2016). The Princeton Field Guide to Dinosaurs (2nd ed.). 84. Princeton University Press.

    Placed Podokesaurus among coelophysids.

    paul2016a
  6. Jones, B. (2026). The Princeton Encyclopedia of Dinosaurs: Theropods. Princeton University Press.

    Treats Podokesaurus as a coelophysid.

    jones2026c
  7. Holtz, T. R. (1994). The phylogenetic position of the Tyrannosauridae: implications for theropod systematics. Journal of Paleontology 68: 1100-1117.

    Regards Podokesaurus as an indeterminate small theropod.

    holtz1994a