Prophalangopsidae

Extant species inhabit montane environments. North American grigs (Cyphoderris) occur in montane forests and subalpine zones. The Asian species Paracyphoderris erebeus occupies subalpine zones at 500–1650 m elevation, favoring open rocky places with reindeer lichen (Cladonia rangiferina) in elfin woodland and larch forest.

Extant distribution is highly disjunct: one genus (Cyphoderris) in northwestern North America (Alberta, British Columbia, and adjacent United States), and four genera in Asia (China, Indian subcontinent, and Siberia). The Siberian species Paracyphoderris erebeus is known from the Khabarovsk Territory and Jewish Autonomous Region of the Russian Far East. Fossil distribution spans the Northern Hemisphere, with Jurassic and Cretaceous records from China, Germany, Russia, Kazakhstan, Kyrgyzstan, United Kingdom, Mongolia, Brazil, and New Zealand.

Adults of Paracyphoderris erebeus are active from June until the onset of cold weather; the species overwinters as nymphs. North American Cyphoderris species show allochronic separation, with C. buckelli breeding earlier than C. monstrosa.

Paracyphoderris erebeus feeds on understory plant blossoms in spring, notably lingonberry (Vaccinium vitis-idaea), and on staminate cones of elfin trees prior to pollen release in June. Diet of other extant species is not documented in available sources.

Overwinters as nymphs. Adults emerge in early summer. Oviposition occurs on the ground surface using a very short, nearly rudimentary ovipositor, likely in chambers prepared by the female.

Males stridulate to attract females. In Paracyphoderris erebeus, males call on sunny days from tree trunks at 30–40 cm height or from reindeer lichen. The family exhibits a distinctive mating system involving sexual cannibalism: females consume the fleshy hindwing lobes of males during copulation. Males lacking these lobes possess modified cuticular structures ("gin trap") to grasp the female abdomen. The family possesses the Ander's organ, an anti-predator structure producing ultrasound. Females and nymphs are cryptic, hiding under stones and becoming active in evenings; males are more surface-active in sunny conditions.

The family represents a relict lineage of ancient orthopterans, potentially serving as an indicator of humid montane habitats with relatively low summer temperatures. The extreme phylogenetic isolation of extant species makes the family significant for studies of orthopteran evolution and biogeography.

Extant species are obscure and rarely encountered due to limited distribution and cryptic habits. Climate modeling for Paracyphoderris erebeus suggests potential vulnerability to warming, with prospective Red List status. No economic or agricultural significance is documented.

• Tettigoniidae (katydids/bush-crickets)Closest living relatives, but distinguished by over 230 million years of independent evolution; prophalangopsids retain more ancestral characteristics and exhibit the unique sexual cannibalism of male hindwing lobes not found in katydids
• Gryllacrididae (camel crickets)Both families were historically confused in keys; prophalangopsids possess wings and auditory organs on the fore tibiae, while camel crickets are usually wingless with strongly arched backs and lack tibial auditory organs

• Orthoptera
• Ensifera
• Hagloidea
• relict
• sexual cannibalism
• Jurassic fossil
• montane
• grigs
• stridulation
• Ander's organ

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Grasshoppers of Wyoming and the West
• Does hunger lead to hybridization in a genus of sexually cannibalistic insects (Orthoptera: Prophalangopsidae)?
• The Mysterious Amurian Grig Paracyphoderris erebeus Storozhenko, 1980 (Orthoptera: Prophalangopsidae): New Data on Its Distribution, Ecology and Biology
• A review of Chifengiinae (Insecta: Orthoptera: Prophalangopsidae) with description of new Jurassic material from the northwestern Junggar Basin, China