Cristaria liboi Chen, Xiang, He & Guo sp. nov. Material examined. Holotype: • NCUMB_CL 250901, shell length 185.21 mm, shell width 65.94 mm, shell height 111.25 mm (Fig. 2 I – L), Furong Creek (31.6296°N, 104.8649°E), Mianyang City, Sichuan Province, China, in August 2025. Paratypes: • 1 specimen, NCUMB_CL 250902, shell length 185.13 mm, shell width 66.74 mm, shell height 113.85 mm (Fig. 2 M – P), locality and habitat same as holotype. Diagnosis. Shell winged, large, oval, thick, solid; wing not obvious, posterior ridges high and obtuse. Umbo often eroded. Muscle scar obvious. Incurrent aperture without papillae arranged. Nacre lavender or white. Description. Shell winged, large, oval, black, thick, solid; wing not obvious. Posterior ridges high and obtuse; ventral margin curved; posterior slope prominent; periostracum sculptured with thick and obvious concentric growth lines. Right and left valve with an almost completely degraded pseudocardinal teeth and a short lateral tooth. Hinge well developed. Umbo often eroded. Muscle scar obvious. Nacre lavender or white (Fig. 2 I – P). Incurrent aperture without papillae arranged and excurrent aperture with obvious papillae arranged in one row; incurrent aperture papillae are more than twice the size of the excurrent aperture, and both have black pigmentation (Fig. 5 A). Etymology. The name of this species is in honour of Mr Li Bo, a conchologist who collected the specimens. Vernacular name. 李氏冠蚌 (li shi guan bang). Habitat and distribution. This species is currently only known to be distributed in the Furong Creek, Mianyang City, Sichuan Province (Fig. 1). Remarks. The species can be distinguished from other species in the genus by its characteristics, such as the incurrent aperture without arranged papillae and the wings being not obvious (Fig. 5 A, B).

Published as part of Chen, Hui, Qin, Wei-Hua, Du, Wen-Hui, Xiang, Hong-Quan, He, Yue-Ming, Guo, Ge, Chu, Ke-Lin & Wu, Xiao-Ping, 2026, Taxonomic revision of the freshwater mussel subtribe Cristariina (Bivalvia, Unionidae) in China: description of a new species and new synonyms, pp. 47-60 in ZooKeys 1268 on pages 47-60, DOI: 10.3897/zookeys.1268.173464