Anostostomatidae

Distinguished from related families Stenopelmatidae (Jerusalem crickets) and Rhaphidophoridae (cave crickets) by combination of: southern hemisphere distribution (vs. primarily northern hemisphere for Stenopelmatidae); presence of tympanal hearing organs in most species (absent in Rhaphidophoridae); and specific tibial spine arrangements. From Gryllacrididae (raspy crickets) by generally more robust body form and different stridulatory mechanisms. From Tettigoniidae (katydids) by shorter, stouter hind legs and typically nocturnal habit with reduced wings. Male head modifications, when present, are genus-specific and useful for identification. Foretibial spine count (one vs. two) separates some South African genera.

Diverse habitats across southern hemisphere landmasses. Australian king crickets occupy varied habitats including forests and streamsides. New Zealand wētā include: giant wētā in native bush and scrub; tree wētā (Hemideina) in arboreal habitats, utilizing tree holes and cavities; ground wētā (Hemiandrus) in forest leaf litter and burrows. Some species show specific microhabitat associations: Transaevum nymphs inhabit streamsides and enter water when disturbed; Exogryllacris feeds on fungal fruiting bodies on fallen logs. Lesser Antilles species restricted to well-preserved rainforests, with elevation varying by island position. The Mahoenui giant wētā has uniquely exploited dense gorse (Ulex europaeus) thickets as refuge from predators.

Southern hemisphere distribution reflecting Gondwanan heritage: South Africa (including Parktown prawn and diverse king cricket fauna); Australia (widespread king crickets including winged and wingless forms); New Zealand (diverse wētā fauna including giant wētā, tree wētā, ground wētā, and tusked wētā); Central and South America (Mexico, Guatemala, Colombia, Brazil, Lesser Antilles); Asia (China, Japan, Taiwan, India). Some Japanese island populations suggest possible dispersal capabilities or more complex biogeographic history than simple vicariance.

Nocturnal activity pattern consistent across family; individuals become active shortly after sunset. Long life cycles with extended development: egg development up to 18 months, nymphal stages lasting 1-3 years with 7-10 instars, and adult longevity of one year or more. Adults present year-round in many species, with activity influenced by temperature—movement distances increase significantly above 13.5°C in at least one studied species. Breeding and egg-laying phenology varies by species and climate.

Highly variable across species and genera. New Zealand tree wētā (Hemideina) primarily herbivorous, feeding on leaves, fruit, and flowers, with occasional scavenging of invertebrate carcasses. Ground wētā Anderus maculifrons predatory on forest invertebrates. Australian king crickets include: generalized scavengers consuming dead and decaying matter; specialized fungal feeders (Exogryllacris feeding on fungal fruiting bodies on fallen trees); and active predators—one documented case of preying on funnel-web spiders. Some South African species likely omnivorous or predatory given mandibular morphology.

Hemimetabolous development with three stages: egg, nymph, and adult. Extended life history characteristic: egg development period up to 18 months; nymphal development spanning 1-3 years with 7-10 molts; adult lifespan exceeding one year in many species. Females of some species construct isolated chambers for egg brooding and early nymph care. Ovipositor morphology varies: long and sword-like in some ground-dwelling species, reduced in others. Maternal care, where present, involves guarding eggs and young nymphs in excavated chambers.

Strictly nocturnal, emerging shortly after sunset. Communication via substrate-borne vibrations and airborne sound produced through stridulation; both sexes and nymphs capable of sound production. Diverse antipredator defenses: retreat to burrows or dense vegetation; jumping escape; stridulatory warning; ejection of foul-smelling feces; biting; flight in winged species; and aquatic escape (Transaevum nymphs jumping into water). Male-male combat ritualized in some species, involving visual displays, antennal fencing, kicking, and grappling; tusked wētā (Motuweta) use enlarged mandibular tusks as weapons with reduced injury rates compared to less ritualized fighters. Giant wētā use dorso-ventral tremulation in agonistic encounters; ground wētā drum abdomens on plant substrates for pair formation.

Significant invertebrate components of southern hemisphere ecosystems. Herbivorous species contribute to leaf litter processing and nutrient cycling. Predatory and scavenging species participate in detrital food webs and invertebrate population regulation. Tree wētā serve as cavity-users in forest ecosystems, potentially influencing decomposition processes in tree holes. Prey for diverse vertebrate predators including birds, reptiles, and mammals; in New Zealand, introduced mammalian predators (rats, mice, possums, hedgehogs, cats) have severely impacted populations, contributing to declines and extirpations. Some species function as ecological indicators of habitat intactness, particularly in forest systems.

Cultural significance in New Zealand, where wētā are iconic native fauna and conservation flagships; giant wētā in particular receive substantial conservation attention and legal protection. Mahoenui giant wētā conservation involves management of gorse habitat—a novel ecosystem supporting the only mainland lowland population. In South Africa, the Parktown prawn is a well-known suburban species, notable for entering swimming pools and houses. Some large species kept in captivity by entomology enthusiasts. No significant agricultural pest status, though occasional localized damage to garden plants by herbivorous species. Subject of extensive scientific research on evolution, biogeography, communication, and conservation biology.

• StenopelmatidaeJerusalem crickets share robust body form and nocturnal habits, but are primarily northern hemisphere in distribution and lack the tympanal hearing organs present in most Anostostomatidae.
• RhaphidophoridaeCave crickets are similarly flightless and nocturnal with long antennae, but lack tympanal organs entirely, have more slender bodies, and are typically associated with caves and subterranean habitats.
• GryllacrididaeRaspy crickets overlap in some habitats and share Ensifera relationships, but possess different stridulatory apparatus, silk-producing capabilities, and generally more slender body plans.

Not all insects called 'wētā' in New Zealand belong to this family—cave wētā belong to Rhaphidophoridae. The 'Parktown prawn' name misleadingly suggests crustacean affinities. South African 'armoured ground crickets' (family Tettigoniidae, subfamily Hetrodinae) are frequently confused with king crickets but are unrelated. The family's Gondwanan distribution has been interpreted as purely vicariant, but evidence for Oligocene submergence of New Zealand and presence on some Japanese islands suggests more complex biogeographic history involving dispersal or recent colonization in some regions.

• orthoptera
• ensifera
• stenopelmatoidea
• nocturnal
• southern hemisphere
• weta
• king crickets
• vibrational communication
• flightless
• conservation
• gondwana
• herbivore
• predator
• scavenger
• sexual dimorphism
• extended life cycle
• New Zealand
• Australia
• South Africa

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Tuesday Teaser | Beetles In The Bush
• The Origin of Grasshoppers, Katydids, and Crickets: A New Study Resolves the Evolutionary Tree of the Orthoptera
• ID Challenge #2 | Beetles In The Bush
• Repertoire of male-male agonistic behaviour in tusked weta (Motuweta ripariaGibbs) (Orthoptera: Anostostomatidae) compared to tree weta (HemideinaWalker) (Orthoptera: Anostostomatidae)
• Vibrational Behaviour and Communication in the New Zealand Weta (Orthoptera: Anostostomatidae)
• Australian king crickets: distribution, habitats and biology (Orthoptera: Anostostomatidae).
• Survival, predation, and behaviour of the Mahoenui giant wētā ('Deinacrida mahoenui': Anostostomatidae: Orthoptera)
• Two new species of Hemiandrus (Orthoptera: Anostostomatidae) from Fiordland National Park, New Zealand
• A new apterous species of Chevron Crickets Anabropsis Rehn, 1901 from Yunnan, China (Orthoptera: Anostostomatidae: Anabropsini)
• A new species of large Hemiandrus ground wētā (Orthoptera: Anostostomatidae) from North Island, New Zealand
• New species and taxonomic rearrangements of Anostostomatid Crickets (Orthoptera: Stenopelmatoidea: Anostostomatidae) from the Neotropics
• New species of Tintiyakus Cadena-Castañeda (Orthoptera: Anostostomatidae: Lutosinae) from the Brazilian Mountain Amazon Rainforest
• A new genus and five new species of Anostostomatidae from the Lesser Antilles (Orthoptera: Ensifera)
• Review of Glaphyrosoma (Orthoptera: Stenopelmatoidea: Anostostomatidae), including new species and biological information
• Studies in Guatemalan Ensifera: New Glaphyrosoma species (Orthoptera: Anostostomatidae) and additional data for other described species
• Redescription of Libanasa brachyura Karny, 1928. (Orthoptera: Anostostomatidae: ?Lutosinae) from Tanzania and problems at the subfamily level
• Macropterous species of genus Melanabropsis Wang & Liu, 2020 (Orthoptera: Anostostomatidae: Anabropsini) from the localities predicted in a previous study
• The reproductive biology and the eggs of New Zealand Anostostomatidae.
• Comparative Analysis of the Mitochondrial Genomes of Five Species of Anabropsis (Orthoptera: Anostostomatidae) and the Phylogenetic Implications of Anostostomatidae.
• Complete mitochondrial genome of Melanabropsis tianmuica (Anabropsinae: Anostostomatidae) from China.