Tetrapod Zoology

Struthio‘s pectoral weirdness


Inspired by the kiwi weirdness looked at here recently, I thought I’d focus on some other ratite skeletal stuff. But the idea here isn’t to identify the animal. This is obviously the skeleton of an ostrich Struthio camelus. The question for you is a simple one: what’s going on with the pectoral girdle? What makes it weird? Hmm, I wonder…


  1. #1 Ville Sinkkonen
    February 17, 2009

    Lack of Furcula?

  2. #2 Moritz
    February 17, 2009

    More aptly said, the claviculae (the massive things fused to the coracoids) are not fused to one another, so they’re not a real furcula.

  3. #3 TEO
    February 17, 2009

    Seems that the clavicles are not fused into a furcula, and, instead, each clavicle is fused to the correponding coracoid…

  4. #4 Adam
    February 17, 2009

    The fused on clavicles make the cracoid look broad, rectangular and fenestrated – pretty much a dead spit for the coracoids of Sinornithosaurus.

  5. #5 Alefrisk
    February 17, 2009

    Possibly the centrally located foramen of the coracoid?

  6. #6 David Marjanović
    February 17, 2009

    Are those separate clavicles (strangely plate-shaped ones), or rather huge, huge, huge acromion processes that reach — on the left side, that is — all the way to the sternum?

    The shape of the coracoid itself is rather unspectacular.

  7. #7 Metalraptor
    February 17, 2009

    So…is this like some sort of unofficial ratite series, or what? Anyway, I would also say lack of a furcula (as far as I can tell), but it may just be missing on this specimen. Other than that I would say the pectoral weirdness results from the very reason why ratites are ratites; the large, flat breastbone that has no keel on its sternum.

  8. #8 Krypto18
    February 17, 2009

    Lack of a keeled sternum? But that’s probably too obvious to even mention.

  9. #9 Bret Schultz
    February 17, 2009

    It looks to me as though the clavicles have been fused to the corresponding scapulas, which in turn have rotated closer to the underside of the torso.

  10. #10 Cory Trego-Erdner
    February 17, 2009

    I’m also going to go with the clavicles being fused to the coracoids. And of course the lack of a keel on the sternum.

  11. #11 John Scanlon FCD
    February 17, 2009

    Yeah, what those folks in the other time-zones said: clavicles separate, fused to scapulocoracoids.

    In Dromaius (Emu) the clavicles are also separate but much more slender and articulated, not fused to the acromion process of the coracoid.

    In Dromornithids, on the other hand, the scapulocoracoids are more widely separated on the sternum (which has a quite massively thickened anterior margin) and nobody has yet found a clavicle. No clavicular facets have been seen on either the sternum or coracoid (I have most of a cf. Bullockornis sternum here with the anterior edge intact; also near-complete scapulocoracoids of this and Barawertornis, but unfortunately their acromion procs are damaged so absence of facets is based on Murray & Vickers-Rich 2004).

  12. #12 Tony Lucas
    February 18, 2009

    If you want unusual Darren try the extinct New Zealand Adzebill, apparently due to the unusual mechanism of the bill they are still trying to figure out what this unusual bird ate.

    Tony Lucas
    New Zealand Cryptozoologist

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