Living-fossil
Guides
Agaoninae
pollinating fig wasps
Agaoninae is a subfamily of pollinating fig wasps within the family Agaonidae. Members are obligate mutualists of Ficus species, developing their entire larval stage inside fig fruits. The subfamily exhibits remarkable morphological stasis, with fossil forms from the Eocene and Miocene nearly identical to modern representatives. Some lineages, such as the proposed Hexapus group, retain ancestral traits including females with two mandibular appendages and hexapodous males with functional mid-legs.
Agulla
Common Snakeflies
Agulla is a genus of modern snakeflies (Raphidiidae) characterized by an elongated prothorax that creates a distinct "neck" appearance. These predatory insects inhabit wooded areas and are associated with tree bark. The genus belongs to an order considered living fossils, with modern species closely resembling Jurassic-era relatives from 140 million years ago.
Atelestidae
Atelestidae is a small family of flies in the superfamily Empidoidea, comprising approximately four extant genera. The family was formally established in 1983, having previously been classified within Platypezidae or as incertae sedis. Phylogenetic studies indicate Atelestidae represents the sister group to all other living Empidoidea, making it the most basal lineage of this diverse superfamily. The family includes both extant and fossil taxa, with the genus Alavesia known from Cretaceous amber and discovered alive in Namibia in 2010. The monophyly of the family remains incompletely resolved, with the genus Meghyperus likely requiring taxonomic revision.
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.
Cupes capitatus
Prominent-headed Reticulated Beetle
Cupes capitatus is the sole extant species in the genus Cupes, a relict lineage within the family Cupedidae. Described by Fabricius in 1801, this beetle represents one of the few living members of an ancient group of beetles with distinctive reticulated wing covers. Its restricted distribution in eastern North America and its phylogenetic isolation make it of particular interest for studies of beetle evolution and biogeography.
Flexamia huroni
Huron River Leafhopper
Flexamia huroni is a leafhopper species in the family Cicadellidae, described by Bess & Hamilton in 1999. It belongs to the genus Flexamia, a group of leafhoppers known for their specialized host plant associations with grasses. The species is named after the Huron River in Michigan, where it was first collected. Like other members of the genus, it likely exhibits strong ecological dependence on specific grass host plants.
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lobal-biodiversity-information-facilityesbiodiversity-image-portalspanish-collectionstype-specimenlichenantarcticabernensisliyellowstoneGrylloblatta chintimini
Marys Peak Ice Cricket, rock crawler
Grylloblatta chintimini is a species of rock crawler (family Grylloblattidae) described in 2015 from Marys Peak in the Oregon Coast Range. It is one of the most recently described species in this relict insect order, bringing the total number of Grylloblatta species to 15. The species occurs in a restricted alpine habitat on persistent snowpack near the 1250 m summit. Like other grylloblattids, it is adapted to cold, moist environments and is considered a living fossil representing one of the most basal lineages of winged insects.
Lepidotrichidae
Lepidotrichidae is a family of basal insects in the order Zygentoma. The family contains the extinct genus Lepidotrix, known from Eocene Baltic amber. The extant genus Tricholepidion, containing a single species from western North America, has traditionally been included here but recent research suggests it belongs to its own family, Tricholepidiidae.
Lepidurus
tadpole shrimp
Lepidurus is one of two extant genera of tadpole shrimp (order Notostraca), distinguished from Triops by morphological and ecological traits. Species inhabit temporary freshwater pools, vernal pools, and permanent lakes across diverse climates from Arctic tundra to desert regions. The genus exhibits notable life history flexibility, with resting eggs capable of surviving desiccation and freezing for decades. Some species are of conservation concern due to habitat specificity, while others serve as agricultural pests or bioindicators of environmental change.
Limulus
Atlantic Horseshoe Crabs
Limulus is a genus of horseshoe crabs in the family Limulidae, containing one extant species, Limulus polyphemus, commonly known as the Atlantic horseshoe crab. The genus also includes at least one confirmed fossil species, Limulus coffini, from the Late Cretaceous of the United States. Several other fossil species have been assigned to Limulus historically, though many have since been reclassified to other genera. The genus is distinguished from other horseshoe crab genera primarily by geographic distribution and subtle morphological features.
Limulus polyphemus
Atlantic horseshoe crab, American horseshoe crab
Limulus polyphemus is a marine and brackish chelicerate arthropod commonly known as the Atlantic or American horseshoe crab. Despite its common name, it is more closely related to spiders, ticks, and scorpions than to true crabs. The species has remained morphologically unchanged for approximately 200 million years, earning it the designation of a 'living fossil.' It is ecologically and medically significant, with populations distributed along the Atlantic coast of North America and in the Gulf of Mexico.
Lymexyloidea
ship-timber beetles
Lymexyloidea is a superfamily of beetles containing the single family Lymexylidae, commonly known as ship-timber beetles. These beetles are characterized by highly reduced elytra that expose the elongated abdomen and leave hind wings uncovered. The superfamily has a pantropical distribution with records from Africa, Central America, South America, and other regions. Members of this group have historically been considered among the most primitive beetles due to their simple morphology, though current phylogenetic analyses place them within or near the Tenebrionoidea. The oldest known fossil is a primitive Atractocerus from 100 million-year-old Burmese amber, earning the group the moniker 'living fossils.'
Macroxyela ferruginea
Macroxyela ferruginea is a sawfly in the family Xyelidae, one of the most ancient lineages of Hymenoptera. This species belongs to a genus characterized by relatively large size among xyelid sawflies and association with coniferous hosts. Xyelidae are considered living fossils, retaining morphological traits found in the earliest known fossil Hymenoptera from the Triassic and Jurassic periods.
Merostomata
Horseshoe Crabs
Merostomata is a class of chelicerate arthropods containing the extinct Eurypterida (sea scorpions) and the extant Xiphosura (horseshoe crabs). The group is characterized by appendages that function as mouthparts proximally and swimming legs distally, reflected in the etymology from Greek μηρός ('thigh') and στόμα ('mouth'). Phylogenetic status remains debated: some analyses suggest Merostomata is not monophyletic, with Xiphosura basal to a clade comprising Eurypterida and Arachnida, while a 2022 analysis recovered monophyly with Xiphosura in a derived position.
Micromalthidae
Telephone-pole Beetles
Micromalthidae is an ancient, relictual family of beetles in the suborder Archostemata, represented today by a single extant species, Micromalthus debilis. The family has a fossil record extending to the Late Permian (approximately 260 million years ago), making it one of the oldest surviving beetle lineages. Members are characterized by highly unusual reproductive biology, including paedogenesis (reproduction by larvae) and parthenogenesis. The family shows extreme morphological reduction in adults, particularly males, with larvae serving as the primary feeding and persistent life stage.
Micromalthus
telephone-pole beetle
Micromalthus is a monotypic genus of beetles containing the single living species Micromalthus debilis, commonly known as the telephone-pole beetle. It represents the sole extant member of the family Micromalthidae, making it a "living fossil" with all other relatives extinct. The genus has been the subject of considerable taxonomic controversy, historically placed in various families including Lymexylidae and Telegeusidae before its current classification in Archostemata. Its reproductive biology is extraordinarily complex, involving multiple developmental pathways and forms of parthenogenesis.
Micromalthus debilis
Telephone-pole Beetle
Micromalthus debilis is a small beetle native to eastern North America and the sole living representative of the family Micromalthidae, often considered a 'living fossil'. The species exhibits one of the most unusual reproductive strategies in Coleoptera: obligate paedogenesis, where reproduction occurs exclusively through parthenogenetic female larvae without production of fertile adults. Adults are vestigial, sterile, and rarely encountered in nature; they can be artificially induced through heat treatment but cannot reproduce. The species is associated with decaying wood and fungal near-red-rot habitats.
Micropterigoidea
Mandibulate Archaic Moths
Micropterigoidea is a superfamily of moths containing a single family, Micropterigidae, with approximately 20 living genera. These insects are considered the most primitive extant lineage of Lepidoptera, retaining ancestral characteristics lost in other moth groups. They are commonly called "mandibulate archaic moths" due to their retention of functional chewing mandibles in the adult stage—a trait absent in nearly all other Lepidoptera.
Mymarommatidae
False Fairy Wasps
Mymarommatidae, known as false fairy wasps, comprise a minute family of parasitic wasps with approximately 20 described extant species across three genera (Mymaromma, Mymaromella, Zealaromma), plus numerous fossil species. These insects are among the smallest known wasps, measuring approximately 0.3 mm in length. For over a century, their biology remained enigmatic until 2022, when Mymaromma menehune was confirmed as a solitary endoparasitoid of barklice eggs (Psocodea: Lepidopsocidae). The family exhibits a distinctive relictual morphology, including a pleated head membrane and unique wing structure, and has been proposed as "living fossils" potentially related to the extinct Serphitoidea.
Notostraca
tadpole shrimp, shield shrimp
Notostraca is an order of small crustaceans commonly known as tadpole shrimp or shield shrimp. The group contains a single extant family, Triopsidae, with two genera: Triops and Lepidurus. These animals are considered living fossils, with morphologically similar forms dating back to the Late Devonian approximately 360 million years ago. They inhabit temporary freshwater pools, shallow lakes, and similar aquatic environments worldwide except Antarctica.
Pentodontini
rhinoceros beetles
Pentodontini is the most diverse tribe within the subfamily Dynastinae (rhinoceros beetles), containing over 100 genera distributed across multiple biogeographic regions. Most genera are restricted to a single biogeographic region. The tribe is characterized by substantial morphological diversity, with generic-level identification often relying on mouthpart morphology in females and secondary sexual characters (horns, claw modifications, antennal club length) in males.
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Raphidiid Snakeflies, Snakeflies
Raphidiidae is the largest family of snakeflies in the order Raphidioptera, comprising over 200 extant species. Members are characterized by an elongated prothorax that gives them a distinctive 'snake-like' appearance. The family is distributed across the Northern Hemisphere, with notable diversity in North America, Europe, and Asia. The genus Alena is considered the most morphologically distinct within the family due to unusual male genital sclerites. Snakeflies in this family are predators of small arthropods.
Raphidioptera
snakeflies
Raphidioptera, commonly known as snakeflies, is an order of predatory holometabolous insects comprising approximately 260 species in two families: Raphidiidae and Inocellidae. The order is distinguished by an elongated prothorax that creates a 'neck-like' appearance, giving rise to their common name. Snakeflies are considered living fossils, with modern species closely resembling forms from the early Jurassic period 140 million years ago. They are primarily arboreal predators of small insects, most commonly associated with wooded habitats and tree bark.
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.
Spanglerogyrus
Spanglerogyrus is a monotypic genus of whirligig beetles (family Gyrinidae) containing the single species S. albiventris. It represents the only living member of the subfamily Spanglerogyrinae, the earliest diverging extant lineage of gyrinid beetles. The genus was described in 1979 from specimens collected in southern Alabama, making it a rare example of a relictual aquatic beetle lineage in North America.
Sphaeriusidae
Minute Bog Beetles
Sphaeriusidae is a family of minute myxophagan beetles (Coleoptera: Myxophaga) known as living fossils due to their exceptional morphological conservatism spanning at least 100 million years. The family contains three genera: the extinct †Burmasporum, the newly defined Bezesporum (known from both Burmese amber and extant Southeast Asian fauna), and Sphaerius, which has worldwide distribution. These beetles are characterized by miniaturized, shiny, blackish, hemispherical bodies and specialized riparian habits. Their species diversity and fine-scale morphological variation have been historically underestimated due to their small size and cryptic habits.
Stictocephala stimulea
Stictocephala stimulea is a treehopper species in the family Membracidae, first described by Van Duzee in 1914. Treehoppers in this genus are characterized by their enlarged, often ornate pronotum that extends over the body like a helmet or thorn. The specific epithet 'stimulea' suggests possible resemblance to or association with stinging organisms, though this refers to appearance rather than actual sting. Like other membracids, this species likely feeds on plant phloem sap using piercing-sucking mouthparts.
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cedar wood wasp, incense-cedar wood wasp
Syntexis is a genus of wood wasps in the family Anaxyelidae, containing a single extant species, Syntexis libocedrii, often called a 'living fossil' due to the family's extensive Mesozoic fossil record. The genus is notable for its obligate association with fire-damaged conifers and its prolonged larval development in living tree wood. Syntexis represents one of the most relictual lineages among extant Hymenoptera.
Syntexis libocedrii
incense-cedar wood wasp, cedar wood wasp
Syntexis libocedrii is the sole extant representative of the family Anaxyelidae, a lineage with an extensive Mesozoic fossil record that makes this species a 'living fossil.' It exhibits a highly specialized reproductive strategy, ovipositing exclusively in wood of recently burned conifers including incense-cedar (Calocedrus), red cedar (Thuja), and juniper (Juniperus). The species is rarely encountered due to its cryptic habits and dependence on post-fire environments.
Tanypteryx
Dark Petaltails, Black Petaltail (for T. hageni)
Tanypteryx is a small genus of petaltail dragonflies containing two species: T. hageni (black petaltail), found in the Pacific Northwest of North America, and T. pryeri, found in Japan. The genus represents an ancient lineage that diverged from its sister species approximately 70-73 million years ago, making it an evolutionary "living fossil." T. hageni is a habitat specialist with nymphs that occupy fen wetlands and dig burrows, an uncommon life history among dragonflies.
Tanypteryx hageni
Black Petaltail
Tanypteryx hageni, the black petaltail, is a rare dragonfly species in the family Petaluridae and one of only two members of the genus Tanypteryx. It represents a phylogenetically ancient lineage that diverged from its Japanese sister species T. pryeri approximately 70-73 million years ago, making it a 'living fossil' among dragonflies. The species is a habitat specialist restricted to montane fen environments in the Pacific Northwest of North America, where nymphs construct and inhabit water-filled burrows—a unique life history strategy shared with other petaltail species but uncommon among dragonflies generally.
Tricholepidion
Tricholepidion
Tricholepidion is a genus of wingless insects in the order Zygentoma, containing a single described species, T. gertschi. It is endemic to the northern coast of California and represents the sole living member of the family Lepidotrichidae, with fossil relatives known from Eocene amber. Its taxonomic position is uncertain; molecular studies have sometimes recovered it as more distantly related to Pterygota than other Zygentoma, which would render Zygentoma paraphyletic. The genus is considered a 'living fossil' due to its isolated phylogenetic position and the extinction of all other family members.
Triops
tadpole shrimp, shield shrimp
Triops is a genus of small branchiopod crustaceans in the order Notostraca, commonly known as tadpole shrimp or shield shrimp. The genus is distinguished by having only a pair of long, thin caudal extensions on the telson, unlike the related genus Lepidurus which bears an additional central platelike process. Some species are frequently sold as aquarium pets in dried egg kits, hatching upon contact with fresh water. In agricultural settings, particularly California rice cultivation, certain species function as early-season pests that damage germinating seedlings.
Triops longicaudatus
Longtail Tadpole Shrimp, American Tadpole Shrimp, Rice Tadpole Shrimp
Triops longicaudatus is a freshwater branchiopod crustacean commonly known as the longtail tadpole shrimp or rice tadpole shrimp. It inhabits ephemeral ponds and pools across western North America, South America, Japan, South Korea, and Pacific Islands. The species is notable for its ancient lineage—morphologically unchanged for over 170 million years—and its remarkable desiccation-resistant eggs that can survive decades in dry sediment before hatching upon rehydration. It displays multiple reproductive strategies including parthenogenesis, hermaphroditism, and sexual reproduction. In California agriculture, it is a significant early-season pest of rice, damaging germinating seeds in flooded fields.
Triopsidae
Tadpole Shrimps, Shield Shrimp
Triopsidae is the sole family in the order Notostraca, commonly known as tadpole shrimps or shield shrimps. These freshwater crustaceans are considered living fossils, with body plans essentially unchanged since the Triassic period. The family contains two genera, Triops and Lepidurus. Members possess a distinctive broad, flat carapace covering the head, a long segmented-appearing abdomen with numerous leg pairs, and compound eyes. Their eggs can survive extended desiccation, enabling populations to persist through drought conditions and hatch when habitats reflood.
Xiphosura
horseshoe crabs
Xiphosura is an order of marine chelicerate arthropods commonly known as horseshoe crabs. The group contains only four extant species, all within the family Limulidae. Xiphosurans first appeared in the fossil record approximately 480 million years ago and have retained a remarkably conserved body plan, earning them designation as living fossils. Recent phylogenomic studies have placed Xiphosura within Arachnida, often as the sister group to Ricinulei, though this classification remains under active revision. The order contains one extant suborder (Xiphosurida) and numerous extinct stem-genera.