Phylogenetics and Systematics of Cockroaches and Termites

Phylogenetic and systematic research on cockroaches (order Blattodea) and termites (infraorder Isoptera) has transformed our understanding of their evolutionary history, taxonomy and ecological roles. Molecular analyses have confirmed that termites are highly derived cockroaches, revising traditional classifications and uniting these insects within a single order. Integrative approaches combine data from mitochondrial and nuclear genes, ultraconserved elements, morphology and fossil calibrations to infer divergence times and resolve interfamilial relationships. Major lineages of cockroaches—Corydioidea, Blaberoidea and Blattoidea—have been robustly supported, with termites emerging from within Blattoidea alongside wood-feeding Cryptocercidae. Systematic frameworks now accommodate rapid rate variation in subterranean lineages, complex biogeographical histories and the deep antiquity of eusocial behaviour in termites. These insights underpin applied efforts in pest management, conservation of decomposer communities and the reconstruction of ancient terrestrial ecosystems, emphasising the global significance of Blattodea systematics for biodiversity science and ecosystem functioning.

Research from Nature Portfolio

Recent genome-scale analyses based on multiple mitochondrial and nuclear markers have achieved unprecedented resolution of cockroach phylogeny. These studies recover three well-supported major clades—Corydioidea, Blaberoidea and Blattoidea—while demonstrating that Anaplectidae is the sister group to the remaining Blattoidea, which includes both Cryptocercidae and termites. Incorporation of extensive taxon sampling and fossil calibrations has refined molecular dating, placing the crown-group divergence of Blattoidea in the late Triassic and highlighting the deep evolutionary roots of eusociality within Dictyoptera.

Phylogenetics and Systematics of Cockroaches and Termites publication trend

The graph below shows the total number of articles in phylogenetics and systematics of cockroaches and termites across all publications each year (not limited to Nature Index journals).

Technical terms

Phylogenetics: Study of evolutionary relationships among organisms based on genetic, morphological or other data.

Systematics: Discipline concerned with classification, nomenclature and the organisation of biodiversity.

Clade: A group of organisms comprising an ancestor and all its descendants.

Ultraconserved elements (UCEs): Highly conserved regions of the genome used as markers for deep-scale phylogenetic inference.

Relaxed-clock model: A method allowing evolutionary rates to vary among lineages when estimating divergence times.

Divergence time: The estimated point in geological history when two lineages split from a common ancestor.

References

1. Dating in the Dark: Elevated Substitution Rates in Cave Cockroaches (Blattodea: Nocticolidae) Have Negative Impacts on Molecular Date Estimates. Systematic Biology (2024).
2. Neoisoptera repeatedly colonised Madagascar after the Middle Miocene climatic optimum. Ecography (2023).
3. Reconstructing the phylogeny of Blattodea: robust support for interfamilial relationships and major clades. Scientific Reports (2017).
4. Phylogeny of Dictyoptera: Dating the Origin of Cockroaches, Praying Mantises and Termites with Molecular Data and Controlled Fossil Evidence. PLOS ONE (2015).