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