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Yumtaax    Boucher (  Coleoptera  :   Passalidae  ) is an endemic genus from the temperate sierras of Mexico and includes six narrowly distributed species.    Yumtaax    species have been assigned to several genera of   Passalidae   throughout history, and a phylogenetic approach is necessary to understand species delimitation and interspecific relationships. This study reconstructed the molecular phylogeny of six    Yumtaax    morphotypes using parsimony and Bayesian analysis of DNA sequence data from the ribosomal nuclear gene region 28S and the mitochondrial gene regions 12S and cytochrome oxidase I (COI) in addition to morphological characters. Analyses recovered two well-supported    Yumtaax    clades (the    Yumtaax   laticornis    and    Yumtaax   imbellis    clades) that are possible sister lineages. One synapomorphic morphological character state and the geographic isolation of the group provide corroborative evidence for monophyly. Molecular phylogenetic analyses and traditional morphological examinations also resulted in the discovery of two undescribed    Yumtaax    species and the discovery of two separate evolutionary lineages (cryptic species) within    Yumtaax   recticornis   . As a result we describe three new species (   Yumtaax   veracrucensis    Beza-Beza, Reyes-Castillo &amp; Jameson,  sp. n. ,    Yumtaax   cameliae    Beza-Beza, Reyes-Castillo &amp; Jameson,  sp. n. , and    Yumtaax   jimenezi    Beza-Beza, Reyes-Castillo &amp; Jameson,  sp. n. ), redescribe two species (   Yumtaax   recticornis    [ Burmeister 1847 ] and    Yumtaax   laticornis    [ Truqui 1857 ]), and provide a key to all nine    Yumtaax    species. This study is one of two studies to use molecular data to evaluate the evolutionary relationships of a genus of Bess Beetles (  Passalidae  ), an ecologically important insect group exhibiting low morphological variability and heretofore lacking molecular phylogenetic study.

zookeys

Phylogeny of the genus    Yumtaax    Boucher (  Coleoptera  ,   Passalidae  ,   Proculini  ): Taxonomic and evolutionary implications with descriptions of three new species