三种大洋性蛸类角质颚形态学差异分析OA

Cephalopods are key functional groups in marine ecosystems,playing essential roles in maintaining the stability of oceanic food webs and supporting global fishery productivity.The chitinous beak,a hard structure located in the buccal mass,shows remarkable morphological variation that reflects interspecific phylogenetic differentiation and closely couples with ecological adaptation traits.Benefiting from its high structural stability and strong decay resistance,the beak has been extensively applied in cephalopod studies covering life history reconstruction,rapid species identification and population genetic differentiation.This study examined the beak morphology of three typical pelagic octopods,namely Vitreledonella richardi,Argonauta argo and Ocythoe tuberculata,based on 87 specimens collected from the research cruises of R/V Songhang hosted by Shanghai Ocean University.Multi-view images(frontal,lateral and dorsal views)of beaks were obtained,and landmark-based geometric morphometrics integrating generalized Procrustes analysis(GPA)and principal component analysis(PCA)were adopted to quantify interspecific shape differences.Significant morphological disparities were detected among the three species(P<0.001):V.richardi has a sharper rostrum and a relatively elongated hood,while A.argo presents a broader wing structure.Centroid size analysis showed that the beak of V.richardi is significantly larger than that of A.argo,and the shape variation patterns differ across different viewing angles.The lateral and dorsal views exhibit higher species discrimination capacity,and the observed morphological differences are consistent with the interspecific divergence in habitat use and feeding habits of the three pelagic octopods.