sˌʌm ɹˈiːsənt ˈɛvɪdəns sədʒˈɛstᵻd ðæt ðeɪ wɜː ðə sˈɪstɚ ɡɹˈuːp tə ðə fˈɛŋɡədˌɪdiː, ænd sˈʌmwʌt dˈɪstəntli ɹᵻlˈeɪɾᵻd tə lˈæmpɪɹˌɪdiː, hˌuːz sˈɪstɚ tˈæksən wʌz kˈænθɑːɹɹˌɪdiː, bˌʌt mˈoːɹ ɹᵻlˈaɪəbəl dʒˈiːnoʊmbˈeɪst fˌaɪloʊdʒnˈɛɾɪks plˈeɪst ɹˈæɡəfθˌælmɪdˌiː plˈʌs fˈɛŋɡədˌɪdiː æz ðə sˈɪstɚ ɡɹˈuːp tə ðə lˈæmpɪɹˌɪdiː.
Some recent evidence suggested that they were the sister group to the Phengodidae, and somewhat distantly related to Lampyridae, whose sister taxon was Cantharidae, but more reliable genome-based phylogenetics placed (Rhagophthalmidae + Phengodidae) as the sister group to the Lampyridae.