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角质颚具有形态特征稳定、良好的信息储存和耐腐蚀等特点,是开展头足类生物学研究的主要硬质材料之一。于2012年9月用灯光罩网船采集南海鸢乌贼样品,共采集角质颚1 325对,对其12个形态参数进行生物学测量,以胴长(ML)数据进行校正后,对中型群(MFS)和微型群(DFS)的形态差异进行分析,并构建了不同群体的判别函数。均数差异性检验表明:MFS群体不同性别的角质颚的上头盖长(UHL)、上脊突长(UCL)、下头盖长(LHL)、下脊突长(LCL)、下侧壁长(LLWL)存在显著差异(P<0.01);DFS群体不同性别的UHL、UCL、上侧壁长(ULWL)、上翼长(UWL)、LHL、下翼长(LWL)存在显著性差异(P<0.01);不同群体雄性的角质颚UHL、上喙宽(URW)、ULWL、UWL存在显著差异(P<0.01);不同群体雌性的角质颚UHL存在显著性差异(P<0.01)。主成分分析表明:MFS群体的主成分因子主要集中在UHL/ML和URL/ML,DFS群体主要集中在ULWL/ML、UCL/ML、LRL/ML、LRW/ML和URW/ML。以性别为区分,利用角质颚对2个群体分别建立判别函数,正确率均达到65%以上,2个群体在部分形态学指标上存在显著性差异,结论具有一定可信度。
Horn jaw has the characteristics of stable morphological characteristics, good information storage and corrosion resistance, which is one of the main hard materials for the study of cephalopod biology. In September 2012, a total of 1 325 pairs of horny jaws were collected from the light seaweed nautical vessels. Twelve morphological parameters were collected for biological measurements. After correction with body length (ML) data, MFS) and micro-group (DFS) morphological differences were analyzed and constructed discriminant functions of different groups. The mean difference test showed that there were significant differences in UHL, UCL, LHL, LCL and lower wall length in the MFS population LLWL) (P <0.01). There were significant differences in UHL, UCL, ULWL, UWL, LHL and LWL between different sex groups in DFS population (P < 0.01). There were significant differences in UHL, URW, ULWL and UWL in different groups of males (P <0.01). There were significant differences in UHL between different groups of females (P <0.01). The principal component analysis showed that the principal component factors of MFS population mainly concentrated in UHL / ML and URL / ML. The DFS population mainly concentrated in ULWL / ML, UCL / ML, LRL / ML, LRW / ML and URW / ML. By gender, using the keratin jaws to establish discriminant functions for the two groups, respectively, the correct rates reached more than 65%. There were significant differences in some morphological indexes between the two groups. The conclusions have certain credibility.