南岭东段趾铁甲属3个亚属的体型分异格局OA

[Objective]This study aimed to reveal the body size differentiation pattern of the genus Dactylispa and its relationship with the taxonomic status of its three subgenera(Dactylispa s.str.,Triplispa,and Platypriella).[Method]Systematic field surveys and laboratory rearing were conducted in the eastern section of Nanling Mountains.Morphometric measurement and analyses were performed on collected specimens of Dactylispa.[Result]A total of 284 specimens belonging to 24 species across three subgenera were obtained.Measurement indicators included body weight,body length,and body width,from which the length‑to‑width ratio was calculated.Statistical analysis showed no significant difference in body weight among three subgenera(P>0.05).The body length of the subgenus Platypriella was significantly greater than that of other two subgenera(P<0.05),while body width and length‑to‑width ratio exhibited highly significant gradient differences among subgenera(P<0.001).Specifically,body width decreased in the order:Platypriella,Triplispa,Dactylispa s.str.,whereas the length‑to‑width ratio showed the opposite trend.Based on the power‑function model,regression relationships between body size indicators were established;all models reached extremely significant levels except for the body width‑weight model in Platypriella.All allometric growth indices(b values)were less than 3.[Conclusion]The morphological differentiation pattern among three subgenera of Dactylispa in the eastern Nanling region is primarily characterized by body width and length‑to‑width ratios.The genus Dactylispa as a whole exhibits a negative allometric growth pattern.