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and wide frontals and parietals, supraoccipital<br />
knob lacking a medial groove, reduced and<br />
dorsally exposed supratemporal fenestrae,<br />
frontals fused on the midline, and a single interfrontal<br />
medial knob are discussed. These<br />
characters are not diagnostic and they can be<br />
found in other titanosaurs such as Rapetosaurus,<br />
Nemegtosaurus, Saltasaurus and Bonatitan.<br />
The braincase, although incomplete, is<br />
well preserved, allowing the examination of<br />
certain delicate internal structures like the inner<br />
ear, which has been exposed through bone<br />
fractures. The titanosaurian inner ear is described<br />
here for the first time: it is morphologically<br />
similar to that of other sauropods<br />
such as Diplodocus and Brachiosaurus,<br />
mainly in the spatial disposition of the semicircular<br />
canals, although showing a proportionally<br />
more robust lagena. The angle between<br />
the planes on which the anterior and<br />
posterior semicircular canals lie is greater than<br />
909 degrees as in other herbivorous dinosaurs,<br />
and different from the theropod Allosaurus,<br />
where that angle is smaller.<br />
2008010306<br />
阿 根 廷 门 多 萨 Potrerillos 地 区 三 叠 纪 四 足<br />
类 的 时 代 和 地 层 位 置 = Age and stratigraphic<br />
position of the tetrapods from the cerro Bayo<br />
at Potrerillos locality (Triassic), Mendoza,<br />
Argentina.. ( 其 他 ). Zavattieri A M ; Arcucci<br />
A B. Ameghiniana, 2007, 44(1): 133-142<br />
The age of the Rio Mendoza Formation at<br />
Potrerillos, Cuyana Basin, was previously assigned<br />
to the Lower Triassic on the basis of its<br />
tetrapod content. However, many authors considered<br />
this as controversial and at present the<br />
unit is assigned to the Middle Triassic because<br />
it rests unconformably upon the Choiyoi<br />
Group, whose uppermost levels are locally<br />
established for the early Middle Triassic. The<br />
tetrapod remains formerly recovered in this<br />
sequence came from a few meters below thick<br />
tuffaceous beds (pink, grey, green) from violet<br />
and reddish mudstones which are attributed<br />
herein as proceeding from the middle to upper<br />
part of the Cerro de Las Cabras Formation.<br />
New material of kannemeyeriid dicynodonts<br />
and indeterminate eucynodonts from the<br />
northern side of Cerro Bayo of Potrerillos<br />
come from the same stratigraphic levels of the<br />
Cerro de Las Cabras Formation, instead of the<br />
Rio Mendoza Formation, as previously<br />
thought. Taking into account the microfloristic<br />
assemblage yielded by the Cerro de Las<br />
Cabras Formation, the age of the oldest amniotes<br />
recorded from the Cuyana Basin cannot<br />
be older than the late Middle Triassic.<br />
2008010307<br />
宁 城 中 生 代 道 虎 沟 生 物 群 中 两 类 具 原 始 羽<br />
毛 翼 龙 的 发 现 及 其 地 层 学 和 生 物 学 意 义 =<br />
Discovery of two kinds of protofeathered<br />
pterosaurs in the Mesozoic Daohugou biota in<br />
the Ningcheng region and its stratigraphic and<br />
biologic significanes. ( 中 文 ). 季 强 ; 袁 崇 喜 . 地<br />
质 论 评 , 2002, 48(2): 221-224<br />
本 文 事 实 是 地 介 绍 了 道 虎 沟 生 物 群 的 组<br />
成 及 相 关 地 层 的 岩 性 , 并 根 据 长 尾 型 嘴 口<br />
龙 类 (Rhamphorhynchoidea) 翼 龙 与 短 尾 型 翼<br />
手 龙 类 (Pterodactyloidea) 翼 龙 同 期 共 生 的 特<br />
点 , 确 信 道 虎 沟 生 物 群 的 地 质 时 代 为 晚 侏<br />
罗 世 。 此 外 , 本 文 还 研 究 了 道 虎 沟 生 物 群<br />
中 翼 龙 身 上 发 育 的 皮 肤 衍 生 物 , 初 步 认 为<br />
它 们 是 原 始 羽 毛 (protofeathers), 至 少 是 与<br />
羽 毛 同 源 的 (feather-homologous), 这 对 于 了<br />
解 羽 毛 ( 广 义 ) 的 演 化 历 史 和 早 期 的 形 态<br />
结 构 将 具 有 十 分 重 要 的 意 义 。<br />
2008010308<br />
南 美 晚 三 叠 世 初 龙 类 Neoaetosauroides engaeus<br />
头 盖 骨 形 态 学 :Aetosaurian 多 样 性<br />
的 证 据 = Cranial morphology of the late Triassic<br />
South American Archosaur Neoaetosauroides<br />
engaeus: evidence for Aetosaurian<br />
diversity. ( 英 文 ). Desojo J B; Báez A M. Palaeontology,<br />
2007, 50(1): 267–276<br />
The cranial anatomy of Neoaetosauroides<br />
engaeus Bonaparte, 1969 from the upper part<br />
of the Los Colorados Formation, western Argentina,<br />
is addressed herein. This description<br />
is based on material collected recently, which<br />
permits a complete restoration of the skull;<br />
previously, a partial lower jaw and premaxillary<br />
and maxillary fragments were the only<br />
cranial remains known. Unlike other aetosaurs<br />
for which the premaxillary dentition is known,<br />
in N. engaeus the upper tooth row extends<br />
anteriorly to reach near the expanded tip of the<br />
snout; this condition is not compatible with<br />
the presence of a keratinous beak previously<br />
suggested for other aetosaurs. The conical<br />
shape of the teeth of N. engaeus differs from<br />
the slightly compressed teeth of Desmatosuchus,<br />
Stagonolepis and Typothorax, and the<br />
distinctly recurved teeth of Aetosaurus and<br />
Aetosauroides. This diversity of dental morphology<br />
suggests a variety of food-item preferences<br />
among aetosaurs.<br />
2008010309<br />
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