Relict-distribution
Guides
Boisea
Boxelder Bugs
Boisea is a small genus of soapberry bugs (family Rhopalidae) with a highly disjunct distribution across North America, India, and Africa. The genus contains at least three recognized species, including the well-known North American boxelder bugs: the eastern Boisea trivittata and western Boisea rubrolineata, plus the African Boisea fulcrata. The patchy, vicariant distribution pattern is considered relictual, suggesting a formerly more extensive continuous range. Members are seed-feeding specialists primarily associated with maple family trees.
Caddoidea
Caddoidea is a small superfamily of harvestmen (Opiliones) within the suborder Eupnoi, established by Nathan Banks in 1893. It contains two families: Caddidae and Acropsopilionidae. Members are characterized by distinctive morphological features including relatively long legs and compact bodies. The group has a disjunct distribution with representatives in North America, eastern Asia, and Australia. Caddoidea represents one of the more specialized lineages within the Dyspnoi-Eupnoi clade of long-legged harvestmen.
Cupes
Cupes is a genus of reticulate beetles in the family Cupedidae, containing a single extant species, Cupes capitatus, native to eastern North America. The genus has a remarkably diverse fossil record, with numerous extinct species described from Eocene to Pliocene deposits in Europe and China. The extant species is small, averaging 7.8 mm in length, with distinctive orange head ornamentation. The disjunct distribution—living species in North America versus abundant fossils in Europe—suggests a formerly widespread group with a contracted modern range.
Ectobius
wood cockroaches, field cockroaches
Ectobius is a genus of small, cool-adapted cockroaches in the family Ectobiidae. Adults measure 6–12 mm in length with brown to yellowish coloration and pale margins. The genus has a complex biogeographic history: fossil evidence from the 49-million-year-old Green River Formation in Colorado indicates Ectobius originated in North America, despite its long absence from the continent until recent reintroductions. Species are primarily distributed across Europe, Africa, the eastern Palearctic, and the Near East. Several species have been introduced to northeastern North America within the last 65 years, where Ectobius lapponicus has become synanthropic.
Eudectus
Eudectus is a genus of rove beetles in the family Staphylinidae, subfamily Omaliinae. The genus was established by Redtenbacher in 1857 and contains at least two described species. Members are found in disjunct regions of Europe and Japan, suggesting a relictual distribution pattern.
Gomphaeschna
Pygmy Darners
Gomphaeschna is a genus of small dragonflies commonly called pygmy darners, currently comprising two extant species native to eastern North America. It represents one of the most ancient surviving dragonfly genera known, with fossil records extending to the earliest Cretaceous (Berriasian) of Russia. The genus formerly had a much broader distribution across Eurasia and western North America, with multiple fossil species documented from the Paleocene through Miocene. Some taxonomic authorities recognize it as the sole genus of the distinct family Gomphaeschnidae due to its deep evolutionary origins.
Nemastomatidae
Nemastomatid Harvestmen
The Nemastomatidae are a family of harvestmen (Opiliones: Dyspnoi) comprising approximately 170 described species in 16 extant genera. The family is divided into two subfamilies with disjunct distributions: Nemastomatinae in Europe, North Africa, and western Asia, and Ortholasmatinae in western North America and eastern Asia. Members are characterized by variable body size (1–6 mm) and often possess elongated, thread-like pedipalps. The family is monophyletic and likely sister to the Dicranolasmatidae and Trogulidae.
Neostenoptera
Neostenoptera is a genus of gall midges (Cecidomyiidae) established by Meunier in 1902. For over a century, the genus was known only from two African records: one species described from copal (young amber) and another collected alive in the Congo. The 2016 discovery of Neostenoptera appalachiensis in Great Smoky Mountains National Park, Tennessee, marked the first New World record of the genus, extending its known distribution to eastern North America. The genus belongs to the tribe Heteropezini within the subfamily Porricondylinae.
Opilioacaridae
Opilioacarid mites, Primitive mites
Opilioacaridae is the sole family in the order Opilioacarida, comprising approximately 13 genera of rare, relatively large mites (1.5–2.5 mm). These mites are considered primitive due to retention of six pairs of eyes and abdominal segmentation, traits lost in other mite lineages. Historically treated as distinct from both Acariformes and Parasitiformes, molecular phylogenetics now places them within Parasitiformes. The family exhibits a disjunct global distribution with populations in semi-arid and tropical regions, including caves, leaf-litter, and rock habitats.
Pelecotominae
Pelecotominae is a subfamily of Ripiphoridae beetles (Coleoptera: Tenebrionoidea) established by Guérin-Méneville in 1857. The subfamily has a sparse fossil record, with confirmed specimens from Eocene Baltic amber and the first definitive Cretaceous record from mid-Cretaceous Myanmar amber (approximately 99 million years ago). Extant genera include Clinops, distributed in South Africa, and Scotoscopus, found in the East Mediterranean region. The subfamily's disjunct modern distribution has been interpreted as reflecting relictual ranges tied to geological history.
Sabacon
Sabacon is a genus of harvestmen (order Opiliones) comprising the monotypic family Sabaconidae, with approximately 59 species recognized as of 2023. Species in this genus are primarily cave-dwelling or associated with moist, sheltered habitats in temperate and boreal regions of the Northern Hemisphere. The genus exhibits a disjunct distribution pattern with centers in North America (especially the southern Appalachians), Europe (Pyrenees, Alps), and Asia (Altai Mountains, Siberia). Several species have been described recently, indicating ongoing taxonomic discovery.
Tetramesa
Tetramesa is a genus of minute phytophagous wasps in the family Eurytomidae comprising over 200 described species. Members are exclusively associated with grasses (Poaceae), where they typically induce stem or inflorescence galls. The genus exhibits pronounced host specificity, with most species restricted to a single grass species or closely related congeners. Several species have been deployed as biological control agents against invasive grasses, including T. romana for giant reed (Arundo donax) and candidate agents for medusahead (Taeniatherum caput-medusae) and African lovegrass (Eragrostis curvula). Adults feed on nectar. Recent phylogenomic studies have synonymized the genera Aiolomorphus and Cathilaria within Tetramesa.
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hotographydrone-imageryLiDARradarsonarseismicgeophysicalgeochemicalbiogeochemicalecoinformaticsbioinformaticscomputational-biologysystems-biologysynthetic-biologybiotechnologynanotechnologygenetic-engineeringgenome-editingCRISPRTALENzinc-finger-nucleasetransgeniccisgenicintragenicsubgenicagrobacterium-mediated-transformationbiolisticselectroporationmicroinjectionprotoplast-fusionsomatic-hybridizationcybridasymmetric-hybridsynthetic-polyploiddoubled-haploidhaploid-inductionanther-culturemicrospore-cultureovule-cultureembryo-cultureendosperm-cultureprotoplast-culturecell-culturetissue-cultureorgan-cultureshoot-cultureroot-culturecallus-culturesuspension-culturebioreactorhairy-root-culturetransformationhardeningmicropropagationclonal-propagationmeristem-cultureshoot-tip-cultureaxillary-bud-culturenodal-cultureleaf-culturepetiole-culturestem-cultureinternode-culturerhizome-culturebulb-culturecorm-culturetuber-cultureseed-culturezygotic-embryo-culturesomatic-embryo-culturesomatic-embryogenesisorganogenesiscaulogenesisrhizogenesisadventitious-shoot-formationdirect-regenerationindirect-regenerationprimary-metabolismsecondary-metabolismbiosynthesisbiotransformationbioconversionbiodegradationbioremediationphytoremediationmycoremediationzooremediationbioaugmentationbiostimulationnatural-attenuationmonitored-natural-attenuationengineered-natural-attenuationpermeable-reactive-barrierpump-and-treatsoil-vapor-extractionair-spargingthermal-desorptionincinerationlandfillingcontainmentcappingslurry-wallgrout-curtainsheet-pilingclay-linergeomembranegeotextilegeogridgeocompositegeosyntheticgeofabricgeonetgeocellgeopipegeostripgeofoamgeobaggeotubegeocontainergeomatgeoblanketgeospacergeodraingeoinjectiongeogroutgeopiergeocolumngeopilegeowallgeobermgeotrenchgeocutgeofillgeoliftgeoslabgeopanelgeoblockgeobrickgeotilegeopavergeowebgeomattressgeocushionXenoscelinae
pleasing fungus beetles
Xenoscelinae is a subfamily of pleasing fungus beetles (family Erotylidae) containing approximately 8 genera and 12 extant species. The group exhibits a relict modern distribution with populations scattered across the Mediterranean, northern Europe, Central Asia, New Zealand, Australia, the Neotropics, and Afrotropics. Fossil evidence from Eocene Baltic and Rovno ambers indicates the subfamily was once far more diverse, comprising 50-67% of European amber Erotylidae during the Priabonian. Extant species occupy varied microhabitats including dead wood, decaying vegetation, and the nests of bees and wasps.