[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

Re: Did dinosaur wings evolve for breeding display?/Longisquama

What's not clear?

IMHO, if the association of 'fronds' to skeleton were anything but genuine, the 'roots' of the fronds would appear to be detached or run through or go beyond the corpus. In this case, the association between the bottom-most portion of the dorsal frill and top of the vertebral column is spot on.

Coincidence??? I think not.

Unique? Probably not. Think Iguana. Sphenodon. Sometimes they are shed, along with the rest of the skin.

Reisz and Sues were speculative? I think not. It was a good paper. Voight et al. amplified those findings. That's always good.

The wings of Longisquama, are the forelimbs, of course. As I wrote in 2002, Longisquama has the same sort of pectoral complex as we see in pterosaurs. Fused interclavicle, overlapping clavicles rimming the sternum. Precursor condition in Cosesaurus. These things were flapping from the get-go all to get food, create a little excitement in the bedroom, or to startle strangers.

I hear Longisquama is being redescribed by a number of workers. Something to look forward to.

David Peters

On Apr 17, 2009, at 4:34 PM, Jaime Headden wrote:

Dave Peters wrote:

It is not clear that this is authentic association, however, since while apparently some frilliness is in ONE taxon that ONE individual associated with *Longisquama*, the material in *L.* is so far unique to itself in nature. That the integumentary structures (if they are indeed integumentary in origin) have a super and substructure that is unique, positing similarities due to an inferred relationship is unsound. It would help if we found an unfaked skeleton with associated structures and in a better state of preservation, and/or some method to determine the method of implantation of these structures in the body.

New assessment of the structures, and a unique, fresher perspective? Or the fact that Reisz and Sues were speculative, but Voight et al. were more concrete and used new machines to assist their analysis?

These "fronds", if they are integumentary in origin, have nothing to do with wings in *Longisquama*. As such, they are (or should) not have any bearing on the origin of pterosaur wing structure. More consistently, you see lizards using their spines and skulls for breeding displays, and ribs for aerial maneuverability, and ne'er do the twain meet it seems.


Jaime A. Headden

"Innocent, unbiased observation is a myth." --- P.B. Medawar (1969)

"Human beings, who are almost unique in having the ability to learn from the experience of others, are also remarkable for their apparent disinclination to do so." --- Douglas Adams (Last Chance to See)

"Ever since man first left his cave and met a stranger with a
different language and a new way of looking at things, the human race
has had a dream: to kill him, so we don't have to learn his language or
his new way of looking at things." --- Zapp Brannigan (Beast With a Billion Backs)

Windows Live™: Life without walls.
http://windowslive.com/explore? ocid=TXT_TAGLM_WL_allup_1b_explore_042009

David Peters davidpeters@att.net