来自蒙古古古老世时期的Hapalodectes (Hapalodectidae,Mesonychia) 的头骨
1Borissiak Paleontological Institute, Russian Academy of Sciences, Moscow, Russia. alopat@paleo.ru.
概括
来自蒙古的古世Hapalodectes头骨化石揭示了关于Mesonychia进化的新见解. 这一发现详细介绍了Hapalodectes dux.独特的牙特征和进化变化.
科学领域:
- 古生物学的古生物学
- 脊椎动物古生物学 脊椎动物古生物学
- 哺乳动物进化 哺乳动物进化
背景情况:
- 哈帕洛德克斯属属属于已灭绝的 Mesonychia 类,已知从古世 - 世时期.
- 以前的Hapalodectes发现主要局限于下,阻碍了对头骨形态的全面理解.
- 蒙古的Naran Bulak形成是古生物学哺乳动物的一个关键 Lagerstätte.
研究的目的:
- 描述来自蒙古的哈帕洛德克斯 (Hapalodectes dux) 的第一个古老时代头骨.
- 分析Hapalodectes dux的头骨和牙特征,并将它们与相关的种类进行比较.
- 为了研究Hapalodectes属内骨结构的进化趋势.
主要方法:
- 一个不完整的Hapalodectes头骨的形态描述和比较分析.
- 检查牙封闭以及上下牙的特征.
- 基于与Mesonychidae共享的头骨特征的家族遗传解释.
主要成果:
- 描述的头骨代表了第一个古世哈帕洛德克斯头骨,根据尺寸和牙封闭,被分配给哈帕洛德克斯杜克斯.
- 哈帕洛德克斯·杜克斯 (Hapalodectes dux) 在面部头骨中表现出类似梅索尼基德的特征,包括显著的眼和格参与.
- 在Hapalodectes dux的上上发现了明显的,这对于Hapalodectidae来说是一个新发现,以及结构的进化变化.
结论:
- 发现Hapalodectes dux头骨提供了关于早期Mesonychians的头骨解剖学的关键数据.
- 在Hapalodectes的上和下中发生的进化变化表明它们适应了增强的剪切功能.
- 这些发现有助于了解古世时期的Mesonychia的多样化和功能形态.
相关概念视频
01:27Cranial Bones: Lateral View
2.0K
The lateral view of the cranium is dominated by temporal, sphenoid, and ethmoid bones.
The temporal bone forms the lower lateral side of the skull. The temporal bone is subdivided into several regions. The flattened upper portion is the squamous portion of the temporal bone. Below this area and projecting anteriorly is the zygomatic process of the temporal bone, which forms the posterior portion of the zygomatic arch. Posteriorly is the mastoid portion of the temporal bone. Projecting...
The temporal bone forms the lower lateral side of the skull. The temporal bone is subdivided into several regions. The flattened upper portion is the squamous portion of the temporal bone. Below this area and projecting anteriorly is the zygomatic process of the temporal bone, which forms the posterior portion of the zygomatic arch. Posteriorly is the mastoid portion of the temporal bone. Projecting...
2.0K
01:22Sutures of the Skull
6.3K
The human skull is composed of several bones that come together to protect the brain and support the structures of the face. The junctions where these bones meet are called sutures.
Sutures are immobile joints between adjacent bones of the skull. The narrow gap between the bones is filled with dense, fibrous connective tissue that unites the bones. The long sutures located between the skull bones are not straight but instead follow irregular, tightly twisting paths. These twisting lines tightly...
Sutures are immobile joints between adjacent bones of the skull. The narrow gap between the bones is filled with dense, fibrous connective tissue that unites the bones. The long sutures located between the skull bones are not straight but instead follow irregular, tightly twisting paths. These twisting lines tightly...
6.3K
01:14Cranial Bones: Superior and Posterior View
2.0K
The superior view of the cranium shows the frontal and paired parietal bones.
The frontal bone is the single bone that forms the forehead. At its anterior midline, between the eyebrows, there is a slight depression called the glabella. The frontal bone also forms the supraorbital margin of the orbit. Near the middle of this margin is the supraorbital foramen, the opening that provides passage for a sensory nerve to the forehead. The frontal bone is thickened just above each supraorbital margin,...
The frontal bone is the single bone that forms the forehead. At its anterior midline, between the eyebrows, there is a slight depression called the glabella. The frontal bone also forms the supraorbital margin of the orbit. Near the middle of this margin is the supraorbital foramen, the opening that provides passage for a sensory nerve to the forehead. The frontal bone is thickened just above each supraorbital margin,...
2.0K
01:08Overview of the Skull
4.3K
The cranium (skull) is the skeletal structure of the head that supports the face and protects the brain. It is subdivided into the facial bones and the brain case, or cranial vault. The facial bones underlie the facial structures, form the nasal cavity, enclose the eyeballs, and support the teeth of the upper and lower jaws.
The cranial vault surrounds and protects the brain and houses the middle and inner ear structures. This cavity is bounded superiorly by the rounded top of the skull, which...
The cranial vault surrounds and protects the brain and houses the middle and inner ear structures. This cavity is bounded superiorly by the rounded top of the skull, which...
4.3K
02:56The Fossil Record
25.0K
The fossil record documents only a small fraction of all organisms that have ever inhabited Earth. Fossilization is a rare process, and most organisms never become fossils. Moreover, the fossil record only exhibits fossils that have been discovered. Nevertheless, sedimentary rock fossils of long-lived, abundant, hard-bodied organisms dominate the fossil record. These fossils offer valuable information, such as an organism's physical form, behavior, and age. Studying the fossil record helps...
25.0K