Cimicomorpha

Cimicomorpha cannot be reliably distinguished from Pentatomorpha by external morphology alone; both infraorders share the apomorphic loss of arolia on the pretarsi. Diagnostic features require examination of pretarsal structure, male genitalia, and internal anatomy. Within Cimicomorpha, families are distinguished by combinations of head structure, labial segmentation, antennal form, tarsal segmentation, and wing venation. The rostrum in many members is modified for piercing animal tissues, though this varies considerably among families.

Habitats are highly diverse across the infraorder and correlate with family-level ecology. Cimicidae and Polyctenidae are exclusively associated with vertebrate hosts (birds, bats, humans). Reduviidae occupy terrestrial habitats from leaf litter to vegetation, with some subfamilies specialized for particular microhabitats. Miridae are predominantly associated with living vascular plants. Nabidae occur in ground cover and low vegetation. Tingidae are found on leaves of woody and herbaceous plants. The superfamily Cimicoidea shows correlated evolution between habitat selection and antennal morphology, with dead plant habitats associated with filiform antennae.

Cosmopolitan distribution spanning all major biogeographic regions. Individual families show distinct patterns: Cimicidae and Reduviidae are worldwide; Miridae are particularly diverse in temperate and tropical regions; Polyctenidae are restricted to the Old World; Joppeicidae have limited distribution in arid regions of the Middle East and Central Asia.

Feeding strategies vary substantially among families. Reduviidae and Nabidae are predatory on other arthropods. Cimicidae and Polyctenidae are obligate hematophages on birds, bats, and mammals. Anthocoridae are predatory on small arthropods and insect eggs. Miridae are predominantly phytophagous, feeding on vascular plant tissues. Some Cimicomorpha show mixed feeding strategies or host associations that remain incompletely documented.

Life cycles vary among families. Many species are univoltine or bivoltine; some exhibit 2-3 generations annually. Overwintering occurs at different developmental stages: most species as adults, some as eggs or nymphs. Parental care has evolved multiple times independently within the infraorder, ranging from egg-brooding by females to active protection of nymphs against predators, with females covering young under their bodies in some lineages.

Predatory families (Reduviidae, Nabidae, Anthocoridae) actively hunt or ambush prey. Some Reduviidae exhibit specialized prey capture behaviors or use of sticky substances. Cimicidae and Polyctenidae are nest-associated and exhibit negative phototaxis, remaining concealed in host roosts or dwellings. Parental care behaviors, where present, involve female attendance of eggs and early-instar nymphs.

Predatory members function as biological control agents of pest arthropods in agricultural and natural ecosystems. Phytophagous Miridae include both crop pests and beneficial species that contribute to plant community dynamics. Hematophagous species (Cimicidae) have direct impacts on human health and welfare. The infraorder contributes substantially to arthropod diversity and trophic complexity in most terrestrial ecosystems.

Cimex lectularius and related Cimicidae are significant pests of human dwellings, causing dermatological reactions and psychological distress. Some Miridae are agricultural pests (e.g., Lygus species damaging cotton, strawberries, and other crops). Reduviidae are valued as biological control agents in integrated pest management. Triatominae (a subfamily of Reduviidae) transmit Trypanosoma cruzi, causative agent of Chagas disease, though this medical importance is restricted to the New World and not representative of the entire infraorder.

• PentatomomorphaShares the apomorphic loss of arolia on pretarsi, historically grouped together as 'Terheteroptera' or 'Geocorisae.' Distinguished by different pretarsal structure, male genitalia, and internal anatomy; Pentatomomorpha typically exhibit different trichome patterns and abdominal scent gland morphology.
• NepomorphaAnother heteropteran infraorder with some predatory members, but retains arolia and is predominantly aquatic or semiaquatic, with associated morphological adaptations for aquatic life absent in Cimicomorpha.

• BugGuide
• Wikipedia
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• An annotated catalog of the Iranian Reduvioidea (Hemiptera: Heteroptera: Cimicomorpha)
• Morphological study of the labial sensilla in Nabidae (Hemiptera: Heteroptera: Cimicomorpha)
• Diversity of hemiptera of the infraorder Cimicomorpha I of the Barsakelmes State National Reserve
• Correlated evolution and Bayesian divergence time estimates of the Cimicoidea (Heteroptera: Cimicomorpha) reveal the evolutionary history
• A new genus and species of Nabinae (Heteroptera: Cimicomorpha: Nabidae) from mid-Cretaceous Burmese amber
• Diversity of Telomeric Sequences in True Bugs (Heteroptera): New Data on the Infraorders Pentatomomorpha and Cimicomorpha
• Comparative Chromosomal Mapping of the 18S rDNA Loci in True Bugs: The First Data for 13 Genera of the Infraorders Cimicomorpha and Pentatomomorpha (Hemiptera, Heteroptera).