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Divergent host use among cryptic species in the fungivorous ciid beetle Octotemnus laminifrons (Motschulsky, 1860), with descriptions of three new species from Japan
Author(s) -
Kobayashi Takuya,
Sota Teiji
Publication year - 2019
Publication title -
systematic entomology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.552
H-Index - 66
eISSN - 1365-3113
pISSN - 0307-6970
DOI - 10.1111/syen.12321
Subject(s) - biology , phylogenetic tree , monophyly , host (biology) , species complex , cytochrome c oxidase subunit i , zoology , taxonomy (biology) , ecology , clade , genetics , gene
Insect–host fungus associations are important ecological features that affect population dynamics and interspecific interactions. However, details of host fungus relationships in fungivorous beetles remain unclear due to incompletely revised taxonomy and insufficient host records. We conducted a taxonomic study of the ciid beetle Octotemnus laminifrons (Coleoptera: Ciidae) and its cryptic species in Japan and investigated fungal host‐use by these ciid beetles. Maximum‐likelihood phylogenetic analysis of mitochondrial cytochrome c oxidase subunit I fragments and two nuclear markers recovered four well‐supported, reciprocally monophyletic groups among specimens previously identified as O. laminifrons . Quantitative analyses of genital structures revealed diagnostic differences among these four lineages. These molecular and morphological analyses indicate that the ciid beetles currently identified as O. laminifrons actually comprise four species: O. laminifrons (Motschulsky, 1860), O. assimilis Kobayashi & Sota sp.n ., O. crassus Kobayashi & Sota sp.n. and O. kawanabei Kobayashi & Sota sp.n. Here we provide a redescription and lectotype designation for O. laminifrons and descriptions of the three new species. These species showed different patterns of fungal host‐use among four Trametes and one Lenzites species. We also studied the phylogenetic relationships among these four species based on restriction‐site associated DNA (RAD) sequence data, which provided a more reliable phylogenetic tree. We discuss shifts in their fungal host use. Our results demonstrate that closely related, congeneric fungivorous insects exhibit different utility patterns for closely related fungal species, a phenomenon that has rarely been reported previously.