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Early Cretaceous slender-toed bipedal dinosaur<br />
tracks are reported from the eastern part<br />
of the Tetori area, central Japan. They are<br />
small, bipedal and tridactyl impressions assigned<br />
toToyamasauripus masuiaeichnogen.<br />
and ichnosp. nov. based on biometric analysis.<br />
Thirty-three individuals ofToyamasauripus<br />
masuiaeshow the highest density of footprints<br />
of any dinosaur track-sites in Japan. This is<br />
also the first trackway evidence of gregarious<br />
dinosaurs reported from Japan.Toyamasauripus<br />
masuiaeappears to represent<br />
a small bipedal dinosaur track-maker that<br />
was relatively abundant. As no bones are<br />
known from the track-bearing beds, the footprints<br />
add much to our knowledge of dinosaur<br />
faunas at this time.<br />
2008010281<br />
美 国 爱 荷 华 州 密 西 西 比 统 上 部 一 新 的 基 干<br />
四 足 类 : Sigournea multidentata = Sigournea<br />
multidentata, a new stem tetrapod from<br />
the upper Mississippian of Iowa, USA. ( 英 文 ).<br />
Bolt J; Lombard R E. Journal of Paleontology,<br />
2006, 80(4): 717-725 2 图 版 .<br />
Sigournea multidentata n. gen. and sp., an<br />
early tetrapod, is described from the Late Mississippian<br />
Delta locality of southern Iowa,<br />
USA. The holotype and only known specimen,<br />
a right mandible, is unique in the structure of<br />
the symphysial region, and in addition has a<br />
unique combination of characters that are<br />
shared with other tetrapods. The free ventral<br />
border of the single exomeckelian fenestra is<br />
formed by infradentary bones. Its visible portion<br />
shows several arch bases, separated by<br />
notched or straight intervals. This morphology<br />
is interpreted as indicating that the arch bases<br />
and intervals between them reflected a series<br />
of Meckelian fenestrae that were partly exoand<br />
partly endoskeletal, due to the fact that the<br />
exoskeletal arch bases continued dorsally in<br />
Meckelian cartilage. We suggest that this may<br />
exemplify a stage in the evolution of<br />
exomeckelian fenestrae, in at least some lineages<br />
of early tetrapods. The relations of Sigournea<br />
are indeterminate. That it is a<br />
tetrapod is indicated by the presence of pit and<br />
ridge ornamentation, an open lateral line sulcus,<br />
a dorsally directed glenoid, a single elongate<br />
exomeckelian fenestra, absence of intercoronoid<br />
fossae, absence of coronoid fangs, a<br />
single row of marginal teeth on the dentary,<br />
and an absence of dentition on the prearticular.<br />
It is at present impossible to determine its relationship<br />
with other early tetrapods, and we<br />
conclude that Sigournea is best considered as<br />
an early tetrapod incertae sedis.<br />
2008010282<br />
西 非 iullemmeden 盆 地 古 新 世 Dyrosaurid<br />
组 合 的 分 类 学 修 订 = Taxonomic revision of<br />
the Dyrosaurid assemblage (Crocodyliformes:Mesoeucrocodylia)<br />
from the Paleocene of<br />
the iullemmeden basin, west Africa. ( 英 文 ).<br />
Jouve S. Journal of Paleontology, 2007, 81(1):<br />
163-175 1 图 版 .<br />
The dyrosaurids of the Iullemmeden Basin<br />
(West Africa) are mainly represented by two<br />
genera, Hyposaurus and Rhabdognathus. Hyposaurus<br />
has been recognized in the Paleocene<br />
of Mali and Nigeria with two species, H.<br />
nopcsai and H. wilsoni. Diagnostic characters<br />
given by previous authors for these species do<br />
not enable their distinction from each other,<br />
nor from North American species. It is therefore<br />
reasonable to consider H. nopcsai and H.<br />
wilsoni as nomina dubia. In 1930, Swinton<br />
erected the new genus and species Rhabdognathus<br />
rarus on the basis of mandibular remains,<br />
and Buffetaut referred a skull to this<br />
species in 1980. A new skull was described in<br />
2002 by Brochu et al., and referred to Rhabdognathus<br />
sp. Unfortunately, it is impossible<br />
to refer either skull to the type species, the<br />
mandibular remains having no diagnostic<br />
characters at the specific level. Thus, R. rarus<br />
is a nomen dubium, and two new names are<br />
erected for the two skulls: R. keiniensis n. sp.<br />
and R. aslerensis n. sp., all the mandibular<br />
remains being referred to Rhabdognathus sp.<br />
The species Rhabdognathus compressus is<br />
reassigned to the genus Congosaurus, since its<br />
mandible is higher than that of Hyposaurus,<br />
shorter than that of Rhabdognathus, and the<br />
lateromedially compressed teeth demonstrate<br />
that C. compressus and C. bequaerti are<br />
closely related.<br />
2008010283<br />
横 齿 蜥 蜴 类 的 新 类 群 及 "Teiids" 演 化 历 史<br />
的 新 资 料 = New taxa of transversely-toothed<br />
lizards (Squamata: Scincomorpha) and new<br />
information on the evolutionary history of<br />
"Teiids". ( 英 文 ). Nydam R L; Eaton J G.<br />
Journal of Paleontology, 2007, 81(3): 538-<br />
549 3 图 版 .<br />
New material of polyglyphanodontine lizards<br />
from the Late Cretaceous has been found<br />
in various localities in western North America.<br />
Several transversely oriented teeth representing<br />
a new species of Dicothodon were recov-<br />
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