Xiazhuangocaris

{{Short description|Extinct genus of arthropods}}

{{automatic taxobox

| fossil_range = {{fossilrange|Cambrian Stage 3}}

| image = Xiazhuangocaris.png

| image_caption = Restoration

| taxon = Xiazhuangocaris

| authority = Zeng et al. 2020

| type_species = Xiazhuangocaris chenggongensis

| type_species_authority = Zeng et al. 2020

}}

Xiazhuangocaris is an extinct genus of bivalved arthropod known from the Cambrian aged Chengjiang Biota of Yunnan, China. Only a single specimen (NIGP 172765) is known, around {{Convert|5.3|cm|in}} long, which only preserves the anatomy of the carapace and the trunk. The bivalved carpace has a pronounced pair of notches at its front, as well as a posterior notch at its rear. The body had at least 13 tergite-pleurite rings, which terminate in a pair of rounded caudal rami, which are fringed with setae. The describing authors interpreted the taxon as a member of Hymenocarina, which contains other Cambrian bivalved arthropods.{{Cite journal |last=Zeng |first=Han |last2=Zhao |first2=Fang-Chen |last3=Yin |first3=Zong-Jun |last4=Zhu |first4=Mao-Yan |date=September 2021 |title=A new early Cambrian bivalved euarthropod from Yunnan, China and general interspecific morphological and size variations in Cambrian hymenocarines |url=https://linkinghub.elsevier.com/retrieve/pii/S1871174X20300755 |journal=Palaeoworld |language=en |volume=30 |issue=3 |pages=387–397 |doi=10.1016/j.palwor.2020.09.002}}