Taxonomic revision on the Gobio group in the Yellow River drainage, with discussion on the validity of the genus Acanthogobio (Cypriniformes, Gobionidae) Author Fang, Yutian https://orcid.org/0009-0008-5347-9250 State Key Laboratory of Animal Biodiversity Conservation and Integrated Pest Management, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101, China & University of Chinese Academy of Sciences, Beijing, China Author Sun, Zhixian 0000-0003-0565-2801 State Key Laboratory of Animal Biodiversity Conservation and Integrated Pest Management, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101, China & Shanghai Universities Key Laboratory of Marine Animal Taxonomy and Evolution, Shanghai Ocean University, Shanghai, 201306, China Author Zhao, Yahui 0000-0002-4615-596X State Key Laboratory of Animal Biodiversity Conservation and Integrated Pest Management, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101, China text Zoosystematics and Evolution 2025 2025-03-25 101 2 661 679 journal article 308803 10.3897/zse.101.144134 ba5e7e4c-6710-44c8-933c-ef535b168385 72D44F7D-13D3-4AFA-A57E-B11B2175A6F3

Table 4. Loadings on the first three principal components extracted from morphometric data of Gobio meridionalis and G. rivuloides.

Morphometric measurements	PC 1	PC 2	PC 3
Standard length	0.227	–0.059	– 0.025
Body depth	0.238	–0.069	– 0.147
Head length	0.201	0.205	–0.014
Head depth	0.213	0.201	–0.161
Head width	0.278	0.147	–0.415
Dorsal-fin base length	0.251	–0.051	– 0.051
Pectoral-fin base length	0.223	–0.004	0.656
Pelvic-fin base length	0.278	–0.538	0.235
Anal-fin base length	0.258	–0.289	0.083
Caudal peduncle length	0.279	–0.080	– 0.158
Caudal peduncle depth	0.216	0.117	0.090
Eye diameter	0.160	–0.105	– 0.344
Interorbital width	0.204	0.056	0.142
Snout length	0.211	0.551	0.299
Pre-dorsal length	0.216	0.136	–0.108
Pre-pectoral length	0.192	0.326	0.050
Pre-pelvic length	0.210	–0.002	– 0.091
Pre-anal length	0.221	–0.036	– 0.023
Post-dorsal distance	0.246	–0.220	– 0.004