Abstract：
The Mecocephala group comprises about 50 species, restricted to the Neotropics and with the highest species richness in Neotropical South America. Several species use rice as host plants and their identification is facilitated by the presence of exaggerated head proportions and a unique male genitalic morphology. The taxonomy of the group has been extensively explored, but inferring its monophyly and especially its internal phylogenetic relationships has been challenging. Here, we inferred the phylogenetic relationships for the group assembling the most complete taxonomic sampling to date, analyzing discrete and continuous morphological characters through equal and implied weighted parsimony analyses. The monophyly of the group was recovered, but internal relationships varied slightly according to the dataset tested. Thus, we propose internal arrangements for the group and provide a formal description of the Mecocephala group, diagnoses for each genus, a dichotomous key to identify its genera, and illustrations of the morphological characters and type species.
摘要：
Mecocephala类约有50种，仅限于新热带地区，并且在新热带地区的物种丰富度最高。一些物种使用水稻作为寄主植物，并且由于存在夸张的头部比例和独特的雄性生殖器形态而促进了它们的鉴定。该群体的分类法已经得到了广泛的探索，但是推断其单生，尤其是其内部系统发育关系一直具有挑战性。这里,我们推断了迄今为止组装最完整分类样本的群体的系统发育关系，通过相等和隐含加权简约分析分析离散和连续的形态特征。该组的单品被恢复，但根据测试的数据集，内部关系略有不同。因此，我们提出了该小组的内部安排，并提供了对Meccephala小组的正式描述，每个属的诊断，一个二分法的钥匙来识别它的属，以及形态特征和类型物种的插图。
