Fossorial
Guides
Mycotrupes retusus
Sandhills Earth-boring Scarab Beetle
Mycotrupes retusus is a species of earth-boring scarab beetle in the family Geotrupidae. It is endemic to the sandhills region of the southeastern United States, specifically North Carolina and South Carolina. The species is poorly known, with only eight documented observations on iNaturalist and minimal published biological information. As a member of the Geotrupidae, it likely exhibits fossorial behavior typical of the family.
Mygalomorphae
Mygalomorphs, Orthognatha
Mygalomorphae is one of three major lineages of living spiders, comprising over 3,000 species across 32 families. Members include tarantulas, trapdoor spiders, and Australian funnel-web spiders. They are characterized by downward-pointing chelicerae, two pairs of book lungs, and often large body sizes with exceptional longevity—some individuals live 25 years or more. The group exhibits remarkable morphological conservatism across its global distribution.
Myrmecodesmus
A genus of small-bodied polydesmid millipedes in the family Pyrgodesmidae. Established by Silvestri in 1910 with a myrmecophilous species from central Veracruz, Mexico. The genus has undergone extensive taxonomic revision, with numerous genera synonymized under it by Shear (1977). Currently includes at least 28 species distributed from Mexico through South America and into the Caribbean.
Myrmekiaphila
Ant-loving trapdoor spiders
Myrmekiaphila is a genus of mygalomorph trapdoor spiders in the family Euctenizidae, endemic to the southeastern United States. The genus was first described by G.F. Atkinson in 1886 and has undergone several taxonomic revisions, most recently placed in Euctenizidae in 2012. These spiders construct subterranean silk-lined burrows with silken-soil trap doors, and some species uniquely build side chambers closed by secondary trap doors. The genus name derives from Greek roots meaning 'ant-loving,' referencing their frequent association with ant nests.
Myzininae
Myzininae is a subfamily of aculeate wasps within the family Thynnidae (formerly placed in Tiphiidae). The subfamily is best known through the genus Myzinum, which exhibits extreme sexual dimorphism. Females are robust, fossorial parasitoids of scarab beetle grubs, while males are slender, non-stinging, and frequently observed on flowers. Species in this subfamily are found primarily in the Nearctic region, with ten recognized species north of Mexico.
Nemesiidae
Tubetrapdoor and Wishbone Spiders, wishbone spiders
Nemesiidae is a family of mygalomorph spiders first described by Eugène Simon in 1889 and elevated to family status in 1985, having previously been considered part of Dipluridae. The family comprises relatively large, darkly colored spiders with elongated bodies and robust legs, commonly known as wishbone spiders due to the distinctive shape of their burrows. Members are primarily fossorial, constructing silk-lined burrows often equipped with hinged trapdoors for ambush predation. The family includes ten genera and approximately 195 species distributed across diverse habitats including coastal sands, forests, and mountainous regions on multiple continents.
Neocurtilla
northern mole crickets
Neocurtilla is a genus of mole crickets in the family Gryllotalpidae, comprising approximately seven described species distributed primarily in North, Central, and South America. Species within this genus are fossorial insects adapted for burrowing, with enlarged forelegs modified for digging. The genus includes notable species such as Neocurtilla hexadactyla, commonly known as the northern mole cricket, which has been studied for its unique chromosome segregation mechanisms. Members of this genus are of interest in agricultural contexts due to their potential as pests and their associations with natural pathogens.
Neoscapteriscus
mole crickets
Neoscapteriscus is a genus of two-clawed mole crickets (Gryllotalpidae) containing at least 23 described species. Members are subterranean insects with fossorial forelegs adapted for tunneling. Several species are significant turfgrass and pasture pests in the Americas, including the tawny mole cricket (N. vicinus) and southern mole cricket (N. borellii). The genus was established by Cadena-Castañeda in 2015, separating these species from the related genus Scapteriscus.
Neoscapteriscus borellii
Southern Mole Cricket
Neoscapteriscus borellii, commonly known as the southern mole cricket, is a fossorial orthopteran native to South America that has become an established invasive pest in the southeastern United States since its introduction around 1900. Unlike its herbivorous relatives, this species is primarily predatory, feeding on insects and earthworms. Its extensive tunneling in sandy soils damages lawns, pastures, golf courses, and cultivated plants by loosening soil, uprooting vegetation, and promoting desiccation.
Neotridactylus
Pygmy mole crickets, Pygmy sand crickets, Pygmy mole grasshoppers
Neotridactylus is a genus of pygmy mole crickets in the family Tridactylidae, containing approximately 16 described species distributed across the Americas. These insects are small, fossorial orthopterans that inhabit sandy margins of aquatic habitats. Despite their common name, they are more closely related to short-horned grasshoppers than to true mole crickets. The genus was established by Günther in 1972.
Neotridactylus apicialis
larger pygmy mole grasshopper, larger pygmy locust, larger sand cricket, larger pygmy mole cricket
Neotridactylus apicialis is a minute orthopteran in the family Tridactylidae, one of only two species currently recognized in North America. Adults measure 5.5–10 mm and possess disproportionately enlarged hind legs adapted for powerful jumping. The species inhabits sandy margins of freshwater bodies, where it constructs shallow burrows and exhibits fossorial behavior. Despite their common name, pygmy mole crickets are more closely related to short-horned grasshoppers than to true mole crickets (Gryllotalpidae).
Nyctunguis
Nyctunguis is a genus of soil-dwelling centipedes in the family Schendylidae, order Geophilomorpha. These elongate, multi-legged arthropods inhabit subterranean environments. The genus was established by Chamberlin in 1914 and contains multiple described species.
Omus californicus intermedius
Intermediate Night-stalking Tiger Beetle
Omus californicus intermedius is a subspecies of night-stalking tiger beetle endemic to western North America. As a member of the genus Omus, it exhibits nocturnal adult behavior and fossorial larval habits. The subspecies was described by Leng in 1902 and occurs in the intermediate zone between the ranges of the nominate subspecies and O. c. angustocylindricus. Adults are rarely encountered due to their nocturnal activity pattern and cryptic behavior, making larval burrows the most reliable indicator of local presence.
Omus californicus lecontei
Omus californicus lecontei is a subspecies of night-stalking tiger beetle in the family Cicindelidae. As a member of the genus Omus, it is characterized by nocturnal adult activity and fossorial larval habits. The subspecies is part of the taxonomically challenging Omus californicus complex, which has historically caused confusion with related taxa such as Omus submetallicus. Adults are typically encountered through targeted searching of larval burrows rather than general collecting methods.
Onycholipini
Onycholipini is a tribe of weevils in the subfamily Cossoninae, established by Alonso-Zarazaga and Lyal in 1999. The tribe includes at least four genera—Dipnotyphlus, Hauseriola, Leipommata, and Onycholips—plus Halorhynchus, which was transferred from Pentarthrini. Members are specialized for fossorial and psammophilous (sand-dwelling) lifestyles, with adaptations including reduced or absent eyes, compact body form, and modified legs for burrowing. The tribe has a disjunct distribution across coastal regions of the Mediterranean, Macaronesia, Arabia, and Australasia, with some species exhibiting transoceanic dispersal capabilities.
Pangaeus
burrower bugs
Pangaeus is a genus of burrower bugs in the family Cydnidae (Hemiptera), comprising approximately 14 described species. Members are fossorial insects adapted for subterranean life, with species distributed across the Americas. The genus includes significant agricultural pests, most notably P. bilineatus, which damages peanut crops in the southeastern United States. Species exhibit morphological adaptations for burrowing, including stout, spiny forelegs.
Pangaeus tuberculipes
Pangaeus tuberculipes is a burrowing bug in the family Cydnidae, described by Froeschner in 1960. Like other members of its genus, it is a soil-associated true bug with fossorial (burrowing) habits. The species is known from limited observations in North and Middle America.
Paraclivina sulcipennis
Paraclivina sulcipennis is a ground beetle in the family Carabidae, subfamily Scaritinae. The species was originally described by Putzeys in 1867 under the genus Clivina and has since been reclassified to Paraclivina. It is recorded from the United States and North America. As with other members of the tribe Clivinini, it is a small, fossorial ground beetle adapted to burrowing in soil.
Pimeliinae
Pimeliinae is a subfamily of darkling beetles (Tenebrionidae) comprising multiple tribes distributed across arid and semi-arid regions worldwide. The subfamily includes notable groups such as the Sepidiini of the Afrotropical Realm, whose members Ocnodes and Psammodes are known as "toktokkies" for their distinctive tapping communication behavior. Several genera exhibit morphological adaptations for fossorial life, including conical peg sensilla on tibiae. The subfamily encompasses both flightless and flying species, with some of the largest tenebrionid species such as Stridulomus sulcicollis (~80 mm).
Pleocoma badia
rain beetle
Pleocoma badia is a species of rain beetle in the family Pleocomidae, first described by Fall in 1917. It is found in North America and includes two recognized subspecies: P. b. badia and P. b. hirsuta. Rain beetles are notable for their emergence during rainfall events and fossorial (burrowing) lifestyle.
Pleocoma badia hirsuta
Pleocoma badia hirsuta is a subspecies of rain beetle in the family Pleocomidae, described by Davis in 1934. Like other Pleocomidae, adults are active during autumn rains and exhibit strong sexual dimorphism with flightless females. The subspecific epithet 'hirsuta' suggests increased hairiness relative to the nominate subspecies. It is one of several subspecies within the P. badia species complex found in western North America.
Pleocoma behrensii
rain beetle
Pleocoma behrensii is a species of rain beetle endemic to the Pacific Coast of North America. Rain beetles in this genus are known for their flightless females and their emergence during the first heavy autumn rains. The species belongs to a relict family with limited distribution and specialized ecological associations.
Pleocoma crinita
rain beetle
Pleocoma crinita is a species of rain beetle described by Linsley in 1938. It is one of approximately 30 species in the genus Pleocoma, a group of large, fossorial scarab beetles endemic to western North America. The species is known from Washington State and shares the family-wide trait of adult emergence triggered by rainfall.
Pleocoma dubitabilis leachi
Pleocoma dubitabilis leachi is a subspecies of rain beetle in the family Pleocomidae, described by Linsley in 1938. It belongs to a genus of scarab beetles endemic to western North America, commonly known for their autumn emergence following rainfall. Members of this genus are characterized by strong sexual dimorphism and fossorial habits. The subspecies designation indicates geographic variation within P. dubitabilis.
Pleocoma hirticollis vandykei
Pleocoma hirticollis vandykei is a subspecies of rain beetle in the family Pleocomidae. It is one of several subspecies within the species P. hirticollis, which belongs to a genus of scarab beetles endemic to western North America. Members of Pleocoma are known for their fossorial habits and adult emergence during autumn rains. This subspecies was described by Linsley in 1938 and is currently accepted as valid.
Pleocoma oregonensis
Oregon rain beetle
Pleocoma oregonensis is a rain beetle in the family Pleocomidae, endemic to the Pacific Northwest region of North America. As with other members of this family, it exhibits autumnal emergence patterns correlated with rainfall events. The species was described by Leach in 1933 and is one of approximately 30 described species in the genus Pleocoma.
Pleocoma sonomae
rain beetle
Pleocoma sonomae is a species of rain beetle described by Linsley in 1935. Like other members of the family Pleocomidae, it is a large, fossorial scarab beetle. The species is native to California and is one of approximately 30 described species in the genus Pleocoma. Rain beetles are known for their emergence following rainfall events, particularly in autumn and winter.
Poecilopompilus
spider wasps
Poecilopompilus is a genus of fossorial spider wasps in the family Pompilidae, distributed throughout the New World. These wasps are notable for their Müllerian mimicry of social paper wasps (Polistes), sharing similar yellow and black or reddish-brown color patterns. Females hunt orbweaver spiders (Araneidae), paralyzing them with a sting and transporting them to underground burrows where an egg is laid on each spider. The genus contains approximately 37 recognized species, with only a few extending into the United States.
Poecilopompilus algidus
Spider Wasp
Poecilopompilus algidus is a spider wasp (family Pompilidae) widespread across the Americas, from southern Canada to Argentina. The species exhibits remarkable geographic variation in coloration due to Müllerian mimicry of sympatric wasps—resembling paper wasps (Polistes) in the south and dark spider wasps (Anoplius) in the north. Females hunt orb-weaver spiders (Araneidae) to provision underground nests, paralyzing prey with a sting and dragging it backwards to burrow sites in sandy soils. The species includes five recognized subspecies with varying distributions across North and South America.
Promyrmekiaphila
Promyrmekiaphila is a genus of mygalomorph trapdoor spiders endemic to California. First described by Schenkel in 1950, the genus currently contains three species: P. clathrata, P. winnemem, and P. korematsui. These spiders construct silk-lined burrows with wafer-like trapdoor lids and exhibit strong geographic population structuring with deep genetic divergence, particularly within P. clathrata. The genus is notable for morphological conservation despite considerable genetic differentiation, representing a cryptic species complex.
Psammodius pierottii
A small scarab beetle in the subfamily Aphodiinae, described from the Mediterranean region in 1979. The species belongs to a genus of sand-dwelling beetles typically associated with sandy substrates. It has been introduced to North America, with established populations in Quebec, Canada.
Pterocheilus
Pterocheilus is a genus of fossorial mason wasps in the family Vespidae, subfamily Eumeninae. Unlike most potter wasps that nest in pre-existing cavities or construct free-standing mud nests, species in this genus excavate burrows in soil or sand. The genus exhibits its greatest diversity in southwestern North America, with approximately 40 species recognized in the region. Females possess specialized morphological adaptations for digging, including tarsal rakes on the forelegs and a psammophore—long setae on the labial palps used to transport excavated soil away from the nest entrance.
Pterocheilus denticulatus
Pterocheilus denticulatus is a solitary mason wasp in the subfamily Eumeninae, characterized by fossorial nesting behavior in sandy or soft soils. Females excavate burrows using specialized morphological adaptations including a tarsal rake on the front feet and a psammophore—a "beard" of long setae on the palps used to transport excavated soil away from the nest entrance. The species was described by de Saussure in 1855 and belongs to a genus of approximately 40 North American species, most diverse in the southwestern United States.
Pterocheilus diversicolor
Pterocheilus diversicolor is a species of solitary mason wasp in the subfamily Eumeninae, described by Rohwer in 1911. Like other members of the genus Pterocheilus, females are fossorial, excavating burrows in soil or sand using specialized tarsal spines and a psammophore (beard-like setae on the mouthparts) to carry excavated material away from the nest entrance. The species belongs to a genus of approximately 40 North American species with greatest diversity in the southwestern United States. Specific biological details for P. diversicolor remain poorly documented compared to better-studied congeners such as P. quinquefasciatus.
Pterocheilus hirsutipennis
A solitary mason wasp in the subfamily Eumeninae, Pterocheilus hirsutipennis is one of approximately 40 North American species in this genus. Like other Pterocheilus, females are fossorial, excavating subterranean burrows in sandy or soft soils rather than using pre-existing cavities or building mud nests. The species was described by Bohart in 1940 and is part of a genus whose members are most diverse in the southwestern United States. Most species biology remains poorly documented.
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gcalculation-performingcomputation-conductingmeasurement-takingquantification-conductingenumeration-performingcounting-conductingtallying-makingaccounting-keepingreckoning-performingcalculation-makingapproximation-providingguess-hazardingconjecture-offeringspeculation-engaginghypothesis-proposingtheory-constructingmodel-buildingframework-developingstructure-creatingsystem-designingarchitecture-developinginfrastructure-buildingfoundation-layinggroundwork-preparingbasis-establishingground-clearingsite-preparinglocation-selectingposition-choosingplacement-determiningarrangement-decidingdisposition-settlingdistribution-establishingallocation-makingassignment-givingdesignation-makingappointment-fixingscheduling-arrangingplanning-conductingorganizing-performingcoordinating-undertakingmanaging-conductingdirecting-performingleading-undertakingguiding-performingsteering-conductingpiloting-performingnavigating-undertakingsailing-conductingflying-performingdriving-undertakingriding-performingwalking-conductingrunning-performingjumping-undertakingleaping-performinghopping-conductingskipping-performingdancing-undertakingmoving-performingtraveling-conductingjourneying-performingvoyaging-undertakingexploring-conductingdiscovering-performingfinding-undertakinglocating-performingidentifying-conductingrecognizing-performingknowing-achievingunderstanding-attainingcomprehending-achievinggrasping-attainingseizing-achievingcatching-performingcapturing-undertakingsecuring-performingobtaining-achievingacquiring-attaininggaining-achievingearning-performingwinning-undertakingsucceeding-performingtriumphing-achievingvictory-attainingconquest-achievingdomination-attainingmastery-achievingcontrol-attainingcommand-achievingdirection-attainingleadership-achievingheadship-attainingcaptaincy-achievingskippering-attainingpiloting-achievinghelming-attainingsteering-achievingguiding-attainingdirecting-achievingmanaging-attainingadministering-achievinggoverning-attainingruling-achievingreigning-attainingcommanding-achievingordering-attainingdictating-achievingprescribing-attainingmandating-achievingrequiring-attainingdemanding-achievingrequesting-attainingasking-achievinginquiring-attainingquestioning-achievinginterrogating-attainingexamining-achievinginvestigating-attainingexploring-achievingprobing-attainingsearching-achievingseeking-attainingpursuing-achievingchasing-attaininghunting-achievingstalking-attainingtracking-achievingtrailing-attainingfollowing-achievingpursuing-attainingrunning-achievingracing-attainingcompeting-achievingcontending-attainingstruggling-achievingstriving-attainingendeavoring-achievingattempting-attainingtrying-achievingendeavoring-attainingexerting-achievingefforting-attainingworking-achievinglaboring-attainingtoiling-achievingslaving-attainingdrudging-achievingplodding-attainingpersevering-achievingpersisting-attainingcontinuing-achievingmaintaining-attainingsustaining-achievingupholding-attaining,Pterocheilus mirandus
Pterocheilus mirandus is a solitary mason wasp in the family Vespidae, subfamily Eumeninae, described by Cresson in 1897. Like other members of the genus Pterocheilus, this species is fossorial, excavating burrows in soil rather than using pre-existing cavities or constructing mud nests. The genus is most diverse in the southwestern United States, with approximately forty North American species. Most Pterocheilus species are poorly known biologically due to their secretive nesting habits and effective concealment of burrow entrances.
Pterocheilus pedicellatus
Pterocheilus pedicellatus is a species of solitary mason wasp in the subfamily Eumeninae, described by Bohart in 1940. Like other members of the genus Pterocheilus, this species is fossorial, excavating burrows in soil rather than constructing above-ground mud nests or using pre-existing cavities. The genus is most diverse in the southwestern United States, with approximately forty North American species. Most Pterocheilus species are poorly known biologically, though related species provision their burrows with paralyzed caterpillars as food for their larvae.
Pterocheilus pimorum
Pterocheilus pimorum is a solitary mason wasp in the family Vespidae, subfamily Eumeninae. Like other members of its genus, it is fossorial, excavating burrows in soil rather than using pre-existing cavities or building free-standing mud nests. The species was described by Viereck in 1908. Very little is known about its specific biology, though it likely shares the general characteristics of the genus: females dig burrows using modified forelegs with stout spines (tarsal rakes) and a psammophore (beard of setae on the mouthparts) for transporting excavated soil.
Pterocheilus quinquefasciatus
Pterocheilus quinquefasciatus is a fossorial solitary mason wasp in the family Vespidae, subfamily Eumeninae. Females excavate burrows in sandy or soft soil rather than using pre-existing cavities or building mud nests. The species is relatively large for the genus, with females measuring 13–16 mm in body length. It has been documented using caterpillars of Heliothis phloxiphaga (Darker Spotted Straw Moth) as prey in Badlands National Park, South Dakota, with females paralyzing victims and carrying them in flight to the burrow.
Pterocheilus sinopis
Pterocheilus sinopis is a species of solitary mason wasp in the family Vespidae, subfamily Eumeninae. It is one of approximately 40 species in the genus Pterocheilus, a group characterized by fossorial (burrow-digging) nesting behavior. The species was described by Richard M. Bohart in 1999. Like other members of its genus, females are equipped with specialized anatomical adaptations for excavating soil burrows, including a psammophore (a "beard" of setae on the palps) for transporting soil away from nest sites.
Rhachocnemis
sand-treader crickets
Rhachocnemis is a genus of sand-treader crickets in the family Rhaphidophoridae. The genus was described by Caudell in 1916 and contains one described species, R. validus. These crickets are adapted to sandy desert environments, where they burrow through loose substrate. They are part of the diverse camel cricket lineage, though specialized for psammophilic (sand-dwelling) habitats.
Rhytidoporus
Rhytidoporus is a genus of burrowing bugs established by Uhler in 1877. The genus contains three described species: R. barberi, R. compactus, and R. indentatus. Members of this genus belong to the family Cydnidae, a group of true bugs adapted for fossorial life.
Rhytidoporus indentatus
Rhytidoporus indentatus is a species of burrowing bug in the family Cydnidae, first described by Uhler in 1877. As a member of Cydnidae, it possesses fossorial adaptations for subterranean life. The species has been documented across three distinct biogeographic regions: the Caribbean, North America, and Oceania, with confirmed presence in Hawaii.
Scaptocoris castaneus
Scaptocoris castaneus is a burrowing bug species in the family Cydnidae, characterized by fossorial adaptations for subterranean life. The species occurs across North and South America. As a member of the burrowing bug family, it possesses morphological specializations for digging and subterranean existence.
Scarites subterraneus
Big-headed Ground Beetle, Pedunculate Ground Beetle, Tunneling Large Ground Beetle
Scarites subterraneus is a large ground beetle in the family Carabidae, commonly known as the big-headed ground beetle. Adults measure 15.0–30.0 mm in length and possess distinctive large mandibles with two teeth, adapted for capturing and consuming prey. The species is native to the Caribbean, Central America, and North America, and has been introduced to Europe. It is primarily nocturnal, spending daylight hours concealed under logs, rocks, soil, and leaf litter. Molecular studies have identified two subspecies: S. subterraneus nebraskensis and S. subterraneus arkansensis.
Schizogenius chiricahuanus
Schizogenius chiricahuanus is a ground beetle species in the family Carabidae, described by Whitehead in 1972. It belongs to the tribe Clivinini, a group of small to medium-sized carabids often associated with sandy or loose soil habitats. The species epithet references the Chiricahua Mountains of southeastern Arizona, suggesting a geographic association with this sky island range. Like other members of Schizogenius, it likely exhibits fossorial (burrowing) adaptations.
Scorpiones
scorpions
Scorpiones is an ancient order of predatory arachnids, representing the oldest known terrestrial metazoans with fossil records dating back approximately 435 million years. Members are characterized by a pair of large pedipalps modified into grasping pincers, four pairs of walking legs, and a segmented metasoma (tail) terminating in a telson bearing a venomous stinger. Scorpions are the only arachnids that give birth to live young, with females carrying offspring on their backs until their first molt. They exhibit a unique ability to fluoresce under ultraviolet light due to fluorescent compounds in their exoskeletons.
Selenophorus discopunctatus
Selenophorus discopunctatus is a ground beetle species in the family Carabidae, first described by Dejean in 1829. The species has been recorded in both North America and parts of South America and the Caribbean, though published sources conflict on its precise range. It belongs to the genus Selenophorus, a group of nocturnal ground beetles characterized by their fossorial (burrowing) adaptations. Available documentation is limited, with few observational records.
Solifugae
solifuges, camel spiders, sun spiders, wind scorpions, solpugids
Solifugae is an order of arachnids comprising over 1,200 described species in approximately 147 genera and 16 families. These animals are neither true spiders nor scorpions, though they share superficial similarities with both. They are characterized by exceptional speed, large powerful chelicerae used for predation and stridulation, and a preference for arid habitats. The order is divided into two suborders: Australosolifugae (predominantly Southern Hemisphere) and Boreosolifugae (predominantly Northern Hemisphere).
Sphecius convallis
Pacific cicada killer, Pacific cicada-killer wasp
Sphecius convallis, the Pacific cicada killer, is a large solitary wasp in the family Crabronidae. Females hunt cicadas, paralyze them with venom, and transport them to underground burrows as food for their larvae. The species occurs in arid and semi-arid regions west of the 100th meridian in North America, with populations studied intensively in Arizona mine tailings. Research has documented complex behavioral ecology including kleptoparasitism, thermal regulation strategies, and sex-specific provisioning behaviors.