22Testing for conserved and novel mechanisms underlying phenotypic evolution requires a diversity of 23 genomes available for comparison spanning multiple independent lineages. For example, complex social 24 behavior in insects has been investigated primarily with eusocial lineages, nearly all of which are 25 Hymenoptera. If conserved genomic influences on sociality do exist, we need data from a wider range of taxa 26 that also vary in their levels of sociality. Here we present information on the genome of the subsocial beetle 27 Nicrophorus vespilloides, a species long used to investigate evolutionary questions of complex social 28 behavior. We used this genome to address two questions. First, does life history predict overlap in gene 29 models more strongly than phylogenetic groupings? Second, like other insects with highly developed social 30 behavior but unlike other beetles, does N. vespilloides have DNA methylation? We found the overlap in gene 31 models was similar between N. vespilloides and all other insect groups regardless of life history. Unlike 32 previous studies of beetles, we found strong evidence of DNA methylation, which allows this species to be 33 used to address questions about the potential role of methylation in social behavior. The addition of this 34 genome adds a coleopteran resource to answer questions about the evolution and mechanistic basis of 35 sociality. 36 37 Introduction
38Understanding phenotypic evolution necessitates investigating both the ultimate and proximate influences on 39 traits; however, these investigations require the appropriate tools. Social behavior is a particularly thorny 40 phenotype to study because of its complexity, variation, and its multi-level integration across an organism 41 (Boake et al., 2002). In addition, social behavior also often displays unusual evolutionary dynamics arising 42 from the genetic influences on interactions required for sociality (McGlothlin et al., 2010). Although single 43 genes can influence behavior (Fischman et al., 2011), social behavior is often multifaceted and can reflect a 44 complex genetic architecture (Walling et al., 2008; Mikheyev and Linksvayer, 2015) including influences 45 from epigenetic mechanisms (Cardoso et al., 2015). Genomes in particular are useful resources for 46 evolutionary questions of social behavior because they grant access to both broad scale and fine scale details 47 and mechanisms (Richards, 2015). For social behavior, while there are multiple Hymenopteran genomes 48 available to investigate fine scale detail, we lack sufficiently distantly related species to address broader 49 patterns. It is therefore important to develop genomic resources for organisms that are particularly 50 phenotypic models of social behavior but where genomic information is lacking.
51The genomes of several social insect are now available, including eusocial species such as honey 52 bees (Elsik et al., 2014), stingless bees (Kapheim et al., 2015), several ant species (Gadau et al., 2012), a 53 termite (Terrapon et al., 2...