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Glaphyrorhynchus aalensis ?
 

Glaphyrorhynchus aalensis ?


Ludwigia

Crocodile. Back part of the lower jawbone. Found at the clay pit in Geisingen. Aalenian, Geisingen Oolith. The creature was extrapolated to be at least 7 meters long, one of the largest ever found world wide in these layers. Currently in the collection at Tuebingen for research. Update Aug.2020: I've now reassigned this to Glaphyrorhynchus aalensis  with a question mark according to the most recent revisions.

The above photo is of the original, the two below are of the cast.

 

 

 

R6a.1.jpg

R6b.1.jpg

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Vertebrates (other than fish)

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Steneosaurus is restricted to the type species S. rostromajor from the Middle Jurassic (Callovian) of Normandy by Johnson et al. (2020). The thalattosuchian taxon Glaphyrorhynchus aalensis is the only teleosauroid from the Aalenian of southern Germany, so it's possible that jawbone from Geisingen could be from Glaphyrorhynchus

 

Johnson, M.M.,Young, M.T., and Brusatte, S.L., 2020. Emptying the wastebasket: a historical and taxonomic revision of the Jurassic crocodylomorph SteneosaurusZoological Journal of the Linnean Society 189 (2): 428–448. doi:10.1093/zoolinnean/zlaa027.

 

Von Meyer, H. (1842) Glaphyrorhynchus Aalensis im Untereisenoolith und Brachytaenius perennis im gelben Jurakalk Württembergs. In Neues Jahrbuch für Mineralogie, Geognosie, Geologie und Petrefaktenkunde (pp. 301-304). E. Schweizerbart’sche Verlagsbuchhandlung. Stuttgart.

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I'm just going by the extrapolations from the Paleontologist who is responsible for examining this piece. It's been 14 years since I found the thing and she still hasn't gotten around to working on it.

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@DD1991 Just curious: Are you a practicing paleontologist specializing in Reptiles?

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51 minutes ago, Ludwigia said:

@DD1991 Just curious: Are you a practicing paleontologist specializing in Reptiles?

I'm a tetrapod paleontologist enthusiast, and I wrote this post because Steneosaurus was historically used as a wastebasket taxon for some teleosauroids from the Early to Late Jurassic. We now know that Aeolodon, Sericodon, and Bathysuchus are distinct from Steneosaurus proper (see Johnson 2019 thesis), and the Steneosaurus type species S. rostromajor is way younger than the jawbone from Geisingen. Johnson (2019) and Johnson et al. (2020) correctly recognize that Eudes-Deslongchamps's treatment of Steneosaurus megistorhynchus as the Steneosaurus type species was erroneous and not in line with ICZN rules, as megistorhynchus was described decades after rostromajor and rostrominor was coined; Johnson (2019) recognizes megistorhynchus as a distinct genus (I won't disclose the name of it until Chapter 4 of Johnson's thesis is published).

 

Johnson, M.M. (2019). The taxonomy, systematics and ecomorphological diversity of Teleosauroidea (Crocodylomorpha, Thalattosuchia), and the evaluation of the genus Steneosaurus. Unpublished Ph.D thesis, University of Edinburgh, UK.

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Thanks for the info. I'll pass it along if I ever hear back from her.

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I renewed contact with the paleontologist who just updated me on developments. First of all I forgot to mention that the find was at least published in the hobby magazine "Fossilien" 2010 in an article about the clay pit in Geisingen authored by myself and the above mentioned paleontologist. At the time, Steneosaurus was indeed the wastebasket taxon for all crocodiles of that epoch. She agrees that since the latest revisions, the assignment to Glaphyrorhynchus would be currently the most correct one. She assured me that the jaw is not forgotten and has passed the information along to other specialists, including Mark Young, who are currently working on the subject, so I'm hoping that it shall appear as part of one of the future papers. I've changed the name above accordingly. Thanks again for bringing this to my attention.

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