In spite of the worldwide ecological relevance of Calanus australis and Calanoides carinatus, little is known on the morphology of their mandibular gnathobase edges (MGEs). Thus, in order to further learn about the relationship between MGEs and diet, adults and copepodites of C. australis and C. carinatus collected from northern Patagonian coasts, Argentina, were morphologically analyzed using confocal laser scanning microscopy in transmission mode and scanning electron microscopy. In C. australis males as well as in C. australis and C. carinatus females, MGEs were found to end in one dorsal seta and to have one ventral tooth, four central teeth and three dorsal teeth. In contrast, in C. carinatus males, MGEs were observed to be rudimentary and with no dorsal seta, and −contrary to published data− they were found to have three cone-shaped, short and small tooth-like structures and three-four tooth-like structures that were long and pointed. The main differences between MGEs from copepodites and adults of C. australis and C. carinatus females lied in the number of cuspids observed on the different teeth and the presence of a short inner lateral peak found only in C. australis ventral tooth. Overall, the evidence gathered from our study leads us to classify C. australis and C. carinatus as omnivores.

尽管在全球范围内都存在着澳洲螯虾和Calanoides carinatus，但对其下颌颌基底边缘（MGEs）的形态知之甚少。因此，为了进一步了解MGES和饮食，成年人和的copepodites之间的关系C.芦苇和C. carinatus从北部巴塔哥尼亚海岸，阿根廷收集，在形态上在传输模式下使用共聚焦激光扫描显微镜和扫描电子显微镜分析。在南澳男性以及南澳和加勒比海中女性，发现MGEs终止于一只背齿，并有一只腹齿，四个中央齿和三个背齿。相比之下，在C. carinatus雄性中，MGE被观察到是基本的，没有背刚毛，并且-与公开的数据相反-他们被发现具有三个圆锥形，短而小的齿状结构和三四齿长而尖的类结构。来自角足足类和成年C. australis和C. carinatus雌性的MGEs之间的主要区别在于，在不同牙齿上观察到的尖齿数量以及仅在C. australis腹侧牙齿中发现的一个短内侧面峰的存在。总体而言，从我们的研究中收集的证据使我们能够进行分类C. australis和C. carinatus为杂食动物。