Yunnanocephalus yunnanensis
- 演化之聲
- Mar 18
- 1 min read
Age
Cambrian（"Stage 3"）
521 Ma
Taxonomy
Kingdom: Animalia
Phylum: Arthropoda
Class: Trilobita
Order: Redlichiida
Family: Yunnanocephalidae
Genus: Yunnanocephalus
Species: Yunnanocephalus yunnanensis
Morphological description
Yunnanocephalus yunnanensis is a small trilobite, reaching approximately 2 cm in length. The body is anteriorly broad and gradually tapers posteriorly, giving it an overall oval shape. The genal angles are smoothly rounded and lack genal spines. The thorax consists of 14 segments, and the pygidium is small.
Etymology
Yunnan: refers to Yunnan
cephalus: Latin, meaning head
Biological description
Fossils of Yunnanocephalus yunnanensis have been collected from Yunnan Province, China, and it is especially common in the well-known Chengjiang Biota. This species is the type species of the genus, and Yunnanocephalus is currently the only genus within the family Yunnanocephalidae.
（Author: Bai Leng）
References
Sepkoski, J. (2002). A compendium of fossil marine animal genera (Trilobita entry). Bulletins of American Paleontology
Moore, R.C. (1959). Arthropoda I - Arthropoda General Features, Proarthropoda, Euarthropoda General Features, Trilobitomorpha. Treatise on Invertebrate Paleontology. Vol. Part O. Boulder, Colorado/Lawrence, Kansas: Geological Society of America/University of Kansas Press
Guang, H. X., Aldridge, R. J., Bergstrom, J., Siveter, D. J., Siveter, D. J., Xian-Hong, F. (2004). The Cambrian Fossils of Chengjiang, China: The Flowering of Early Animal Life. Oxford, U.K.: Blackwell Publishing
24.4022, 102.5453
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