Examination of type material of the type species of Wongia, W. triangulata and new material from the uppermost Changhia Formation and Kushan Formation, in Shandong and Liaoning, necessitates transfer of the genus from Avoninidae to Diceratocephalidae. Many species, formerly assigned to Cyclolorenzella or Jiulongshania, are re-assigned to Wongia. Because Agraulos acalle the type species of Jiulongshania is assigned to Wongia, Jiulongshania is synonymized with Wongia. Jiulongshania was previously assigned to Inouyiidae but as a synonym of Wongia belongs to the Diceratocephalidae. Cyclolorenzella is also revised based on new material. Cyclolorenzella is distinguished from Wongia in having a relatively larger, subquadrate cranidium, with a shorter frontal area, longer occipital spine, and a transverse semi-ellipticalsemi-elliptical pygidium, without a narrow pygidial border, but with a weak posteromedian embayment. Three new species: Wongia nanzhaocunensis Yuan, Wongia laevigate Yuan, and Torifera intermedia Yuan, Ren & Gao are erected. Ranges of the constituent species of Wongia, Cyclolorenzella, and Torifera between the Damesella paronai–Ajacicrepida ajax Zone of the uppermost Changhia Formation to the Diceratocephalus armatus Zone of the uppermost Kushan Formation are detailed. This study facilitates the subdivision of pre-established fossil zones and the establishment of biozones based on the First Appearance Datum (FAD) of species, enabling the determination of the sequence of genera and species appearances in the stratigraphic record. It also contributes to the global correlation of the base of the Guzhangian and Paibian Stage in North China Platform.

Key words: Trilobita, Diceratocephalidae, Wongia, Cyclolorenzella, Torifera , Guzhangian, Miaolingian, Cambrian, North China Platform.

Jinliang Yuan [yuanjl403@126.com; ORCID: https://orcid.org/0009-0002-5110-8639], Institute of Geology and Palaeontology, Linyi University, Middle of Shuangling Road, Linyi, 276000, China; Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, 39 East Beijing Road, Nanjing, 210008, China; State Key Laboratory of Palaeontology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, 39 East Beijing Road, Nanjing, 210008, China. Guangying Ren [gyren@lyu.edu.cn; ORCID: https://orcid.org/0009-0009-1030-0342] (corresponding author), Institute of Geology and Palaeontology, Linyi University, Middle of Shuangling Road, Linyi, 276000, China. Jian Gao [gaoeuler@aliyun.com; ORCID: https://orcid.org/0000-0001-8817-8599], Xuejian Zhu [xjzhu@nigpas. ac.cn; ORCID: https://orcid.org/0000-0002-0524-3664], and Haijing Sun [hjsun@nigpas.ac.cn; ORCID: https://orcid. org/0000-0001-9647-0709], Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, 39 East Beijing Road, Nanjing, 210008, China; State Key Laboratory of Palaeontology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, 39 East Beijing Road, Nanjing, 210008, China. Yifan Wang [wangyifan71@lyu.edu.cn; ORCID: https://orcid.org/0000-0003-3395-6407], Institute of Geology and Palaeontology, Linyi University, Middle of Shuangling Road, Linyi, 276000, China.