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69Th Annual Meeting Society of Vertebrate ISSN 0272-4634 September 2009 Society of Vertebrate Paleontology Society of Vertebrate Volume 29, Supplement to Number 3 Volume 69th Annual Meeting Paleontology Society of Vertebrate and Palaeontology of Vertebrate and the 57th Symposium Comparative Anatomy (SVPCA) University of Bristol Bristol, United Kingdom September 23-26, 2009 Program and Abstracts Vol. 29, Supplement to No. 3 September 2009 Wills Memorial 2 1/8” = 1/4 Mile Bristol/Precinct Map Building A4018, M5 junction 17 Badock Hall, Churchill Hall, Durdham Hall, Hiatt Baker Hall, KEY University Hall, Wills Hall Main Entrance to Sites Car Parks Traffic Flow Railway Station Victoria Rooms Burwalls via the Suspension Bridge A369, M5 junction 19 Bristol Marriott B3129 City Centre Hotel Avon Gorge Hotel to M32, M4 junction 19 (A38, A420, A421) Temple Meads Chemistry Building Broadmead Shopping Centre The Grand by Thistle Clifton Hill House Goldney Hall & Clifton Village DETAIL MAP Hotel Novotel Bristol Centre Bristol Temple Meads Railway Station Bristol Marriott A4 Royal Hotel A38, A420, M5 Bristol Airport Taunton, The South West Travelodge Bristol { Central Hotel SEE Bristol Hotel DETAIL MAP Hotel Ibis At-Bristol Bristol Centre Museum University of Bristol Vol. 29, Supplement to No. 3, September 2009 Vol. Poster Session III, (Friday) and thickening of the entire limb, reduction of the femoral medullary cavity, and distal SIGNIFICANT MID-LATITUDE ARIDITY IN THE MIDDLE MIOCENE OF EAST movement of the insertion point for the major limb retractor muscles. These patterns are AISA interpreted as indicative of an ontogenetic shift in locomotor strategy from more agile, LIU, Liping, Department of Geology, University of Helsinki, Helsinki, Finland; ERONEN, cursorial juveniles to a more graviportal adult condition. Taken together, cranial and Jussi, Department of Geology, University of Helsinki, Helsinki, Finland; FORTELIUS, hindlimb changes during the growth of Allosaurus suggest a shift in lifestyle from agile, Mikael, Department of Geology, University of Helsinki, Helsinki, Finland generalist juveniles to graviportal, specialist adults. The East Asian climate history during the Neogene is a complicated and contentious issue, in particular because of its bearing on the development of the East Asian monsoon and Poster Session II, (Thursday) Tibetan uplift chronology. Here we present a paleoprecipitaion analysis based on mean HISPANOMYS BIJUGATUS (RODENTIA, CRICETODONTINAE) FROM molar tooth height (hypsodonty) of large herbivorous mammals to investigate the spatial THE MIDDLE MIOCENE OF LA GRIVE-SAINT-ALBAN (FRANCE): pattern of climate zonation in East Asia during the middle Miocene. We show a generally BIOSTRATIGRAPHICAL IMPLICATIONS humid and uniform situation before the late middle Miocene, replaced by a mid-latitude arid LÓPEZ-ANTOÑANZAS, Raquel, Museo Nacional de Ciencias Naturales - CSIC , Madrid, belt from the late middle Miocene, into the earlier part of the late Miocene. These findings Spain; MEIN, Pierre, Université Claude Bernard - Lyon I, Villeurbanne , France are concordant with the global phenomena of the middle Miocene climate optimum and the subsequent cooling, and suggest that the predominant climate in East Asia for most of the La Grive-Saint-Alban is the name used to refer to various Upper Aragonian pits located Miocene was planetary rather than monsoonal. Our results support a late initiation of the on the territory of the municipality of Saint-Alban-de-Roche (Isère, France). All pits have East Asian summer monsoon, coincidentally with the beginning of eolian red clay deposition yielded micromammals, but remains of Hispanomys have been only recovered from La in the later late Miocene at 7-8 Ma. Grive L (pit Lechartier, with eight fissure-fillings numbered from L1 to L8) and La Grive M (pit Milliat). Two species of this genus have been identified at La Grive-Saint-Alban:H. bijugatus from La Grive L (fissures L3 and L5) and H. decedens from La Grive L (fissure L5 Poster Session III, (Friday) and maybe L7), La Grive M as well as from an unnamed fissure-filling.H. bijugatus shows ARE BIPEDOPUS, SEMIBIPEDOPUS, LACERTIPUS, NAVAHOPUS AND some of the typically primitive dental characters of the Aragonian species of Hispanomys, BRASILICHNIUM DISTINCT ICHNOGENERA? REEVALUATING JURASSIC such as the unreduced M3. However, it also presents progressive features: the absence of TRACKS FROM THE WESTERN USA labial and lingual cingula surrounding the upper and lower molar valleys respectively, the LOCKLEY, Martin, University of Colorado at Denver, Denver, CO, USA; TEDROW, Allen, increase of the number of roots on the second lower molar, and the lost of mesolophs on the Idaho Museum of Natural History , Pocatello, , ID, USA upper molars. All these characters are lacking in H. decedens. All in all, H. bijugatus appears as a relatively derived species with respect to the coeval congeneric species. The age of Bipedopus, Semibipedopus and Lacertipus are ichnogenera proposed for Lower Jurassic the different fissure-fillings of La Grive-Saint Alban is controversial. BecauseH. bijugatus vertebrate tracks from near Meeker, Colorado. The tracks, which occur in eolian facies and H. decedens are believed to be closely related species within the same lineage, the fact of the Navajo-Nugget Sandstone, are similar to the larger ichnogenus Navahopus and the that the former shows a more progressive dental morphology than the latter suggests that the smaller South American ichnogenus Brasilichnium. Both names are presently applied to unnamed fissure-filling from La Grive and La Grive M (withH. decedens only) are older tracks from the Navajo Sandstone in southern Utah. However, the former three names, with than La Grive L3 (with H. bijugatus only). The coexistence of the two species at La Grive potential priority, have never been used, nor have detailed comparisons been made between L5 may indicate an intermediate age for this locality. Should the extremely low percentage these ichnogenera. Diagnostic track features are evaluated in order to determine whether: of H. decedens in the sample from L7 not be due to “contamination”, this locality may be 1) the track names are valid, 2) the named ichnogenera differ from one another, 3) the older than La Grive L3 and L5. ichnogenera suggest diagnostic track makers. Preliminary results indicate that Lacertipus is valid and different from the other ichnogenera due to its tetradactyl elongate track shape and large manus (slight heteropody). It is of probable lepidosaur affinity, but very similar to Technical Session V, Wednesday 2:15 Dolichopodus from the Permian. Bipedopus and Semibipedopus are short, wide tetradactyl HOMOLOGY OF THE INFRAORBITAL BONES AND THE MONOPHYLY OF tracks with pes larger than manus (moderate heteropody). They differ only in the sporadic SEMIONOTIFORMES presence of the smaller manus track. So Bipedopus could be an extra-morphological variant LÓPEZ-ARBARELLO, Adriana, Bayerische Staatssammlung fuer Palaeontologie und of Semibipedopus caused by pes on manus overprinting, or the consistently faint manus Geologie, Munich, Germany traces may indicate a trackmaker placing very little body weight on forelimbs. In the latter case Semibipedopus is a fair descriptor. Brasilichnium and Navahopus have pes tracks very The monophyly of Semionotiformes (including the gars, semionotids and macrosemiids) similar to Bipedopus and Semibipedopus (and the Permian ichnogenera Chelichnus and its is supported by several characters, in particular the presence of anterior infraorbital bones, junior synonym Laoporus). Navahopus is larger than Brasilichnium but both have a small which constitute a unique synapomorphy of this group. The term ‘anterior infraorbitals’ manus (strong heteropody). All are of probable synapsid affinity, althoughNavahopus refers to the infraorbital bones placed anterior to the anterior border of the orbit (preorbitals, has also been attributed to a prosauropod. Clear differentiation of manus and pes track lacrimals, or antorbitals of other authors). Similarly, the ‘toothed infraorbitals’, placed morphology and heteropody in well-preserved specimens are crucial for differentiating between the antorbital and the anterior infraorbitals, constitute a synapomorphy of the these ichnogenera both within the Jurassic and in Mesozoic-Paleozoic comparisons. Distinct Lepisosteidae. Postorbitals and suborbitals, subinfraorbitals and postinfraorbitals, and a patterns of heteropody may help reliably differentiate ichnotaxa. jugal have been identified among the series of dermal bones associated with the infraorbital sensory canal in actinopterygians. However, the number of infraorbital bones is highly variable and individual homologies cannot be established. The association of each of these Romer Prize Session, Thursday 8:30 bones with particular neuromasts of the infraorbital line does not provide a valid criterion FUNCTIONAL SHIFTS DURING GROWTH IN THE LATE JURASSIC of homology because the number of neuromasts in this sensory canal is variable between THEROPOD DINOSAUR ALLOSAURUS: THE IMPLICATIONS OF species of the same genus, between specimens of the same species, and sometimes even ONTOGENETIC VARIATION between the left and right sides of the same specimen. Nonetheless, developmental studies LOEWEN, Mark, University of Utah, Salt Lake City, UT, USA have shown that all the ossifications associated with the infraorbital line occur in connection with one or more neuromasts and through the same process. Therefore, serial homology can Paleobiological
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