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

Re: [dinosaur] Liaoningosaurus ate fish (!!??)



Similar to Thomas' point re hadrosaurs, the type specimen of the sauropod Euhelopus was found with the fish Sinamia was inside its ribcage, but this is not, and has never been suggested to be, evidence of piscivory in sauropods.

On 28 Aug 2016, at 23:54, "Thomas R. Holtz, Jr." <tholtz@geology.umd.edu> wrote:

This is an interesting hypothesis, but let us not forget the possibility that the fish in the belly could be post-mortem associations. (After all, finding a gar in the belly of a hadrosaur is not evidence of piscivory in duckbills!)

On 2016-08-28 09:46, Brian Lauret wrote:

I think it is worth mentioning that according to Victoria Arbour, who
researches ankylosaurs, Little L's plastron is actually misidentified
belly scales (see https://urldefense.proofpoint.com/v2/url?u=https-3A__pseudoplocephalus.com_2014_04_02_scaling-2Dup_&d=DQICAg&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=ls3_qEyVOCCJjjGHPq-2jZenRkmxvhyvYrseiF2u8eI&s=k3Pduly9AngRzJfsGQ8IL68PPrWDNLQZxYaP3R2QK0Y&e= [2]). I have no opinion on the matter.

Arbor provides a close up photo of the supposed armor on that link. Note that it is NOT like the plastron of a turtle or the belly armor of some placodonts. I strongly suspect that she is correct. (And this probably IS the case of the remarkable preservation you refer to in the next paragraph).


Lastly and most out there, an aquatic _Liaoningosaurus_ might also be
an alternative explanation for its lack of preserved integument if
this was actually a derived, naked-bodied ornithischian that had lost
all integument because of adapting said lifestyle. Does the critter
hail from rocks that preserve soft tissue impressions, most notably
feathers, or is this a moot suggestion of mine anyway?

It is from the Yixian, but keep in mind that preservation in any unit--even across the same bedding plane on a meter-scale--can be radically different. (These sites are remarkable because they CAN preserve fine details, not because they MUST preserve them. :-) ).

--
Thomas R. Holtz, Jr.
Email: tholtz@umd.edu         Phone: 301-405-4084
Senior Lecturer, Vertebrate Paleontology
Office: Geology 4106, 8000 Regents Dr., College Park MD 20742
Dept. of Geology, University of Maryland
https://urldefense.proofpoint.com/v2/url?u=http-3A__www.geol.umd.edu_-7Etholtz_&d=DQICAg&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=ls3_qEyVOCCJjjGHPq-2jZenRkmxvhyvYrseiF2u8eI&s=A7rND7UH8hKWweKWmzxkB3Wq8kW9uq35TImpRMMGHE8&e= Phone: 301-405-6965
Fax: 301-314-9661

Faculty Director, Science & Global Change Program, College Park Scholars
Office: Centreville 1216, 4243 Valley Dr., College Park MD 20742
https://urldefense.proofpoint.com/v2/url?u=http-3A__www.geol.umd.edu_sgc&d=DQICAg&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=ls3_qEyVOCCJjjGHPq-2jZenRkmxvhyvYrseiF2u8eI&s=1xgR7YdzE9FmroM1MDu2nHHxrVDpGr7vStvpCnXwz1Q&e= Fax: 301-314-9843

Mailing Address:
Thomas R. Holtz, Jr.
Department of Geology
8000 Regents Drive
University of Maryland
College Park, MD 20742