Trigonidiinae

Saussure, 1874

trigs, sword-tail crickets, winged bush crickets

Trigonidiinae is a of true crickets ( Trigonidiidae) in the order Orthoptera, suborder Ensifera. Commonly known as trigs, sword-tail crickets, or winged bush crickets, this group contains small crickets with diverse morphological adaptations. The subfamily includes tribes Phylloscyrtini (Americas distribution) and Trigonidiini (worldwide except Antarctica), along with numerous distributed across tropical and temperate regions globally. Many exhibit distinctive traits such as enlarged maxillary palps, sword-shaped ovipositors, and specialized including substrate-borne vibrational signals.

Anaxipha fultoni by (c) Arturo Santos, some rights reserved (CC BY), uploaded by Arturo Santos. Used under a CC-BY license.

Falcicula hebardi by (c) Mark Richman, some rights reserved (CC BY), uploaded by Mark Richman. Used under a CC-BY license.

Pronunciation

How to pronounce Trigonidiinae: /trɪɡoʊˈnɪdi.aɪni/

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

Distinguished from other by combination of small size, often distinctive coloration (red and in some ), and female ovipositor . The tribe Phylloscyrtini is restricted to the Americas, while Trigonidiini has global distribution. Some species require examination of male genitalia for definitive identification; genitalic structures including pseudepiphallic parameres and lophi are taxonomically diagnostic.

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Habitat

Found in diverse including forests, grasslands, marshes, and sand dune systems. Many associated with vegetation near streams and wetlands. Some species occupy specialized habitats such as Quaternary sandhills or restored island .

Distribution

Worldwide distribution with tribe Trigonidiini occurring globally except Antarctica, and tribe Phylloscyrtini restricted to the Americas. Documented from North America, South America, Europe, Africa, Asia (including China, Japan, India), Australia, and Indian Ocean islands (Rodrigues).

Seasonality

generally active during mid- to late summer in temperate regions; activity patterns vary by and latitude. Some species exhibit late-season adult associated with fall flowering plants.

Behavior

Many produce calling songs via stridulation; some are mute and rely on substrate-borne . Males of some perform courtship songs distinct from calling songs, accompanied by drumming using to create substrate vibrations. Some species exhibit call-and-search or pure searching mating strategies rather than sedentary calling.

Human Relevance

Some , such as Phyllopalpus pulchellus (red-headed bush cricket or 'handsome trig'), are frequently photographed and documented by naturalists due to their distinctive appearance. The has been subject to extensive taxonomic study, with numerous new species described from Asia in recent years. Some island species are of conservation concern.

Similar Taxa

NemobiinaeHistorically confused with Trigonidiinae; some formerly placed in Nemobiinae have been transferred to Trigonidiinae based on morphological and molecular evidence (e.g., Metioche luteolus)
Gryllinae (true crickets)Larger body size, different ovipositor , and distinct calling song characteristics distinguish true crickets from the generally smaller Trigonidiinae with their specialized palpal and genitalic structures

More Details

Taxonomic History

The has undergone significant revision, with the tribe Phylloscyrtini (auth. Chopard, 1968) established for American including Cranistus, Phyllopalpus, and Phylloscyrtus. Recent molecular studies using COI gene sequences have supported the recognition of new genera and , particularly from China.

Acoustic Communication Diversity

The exhibits diverse communication modes: calling songs via tegminal stridulation, courtship songs with distinct syllable patterns, and substrate-borne vibrational signals (drumming) using mandibular impact. Some Chinese are 'mute' and lack stridulatory apparatus entirely, relying solely on .

Conservation Status

Island Trigonidiinae significant conservation threats. On Rodrigues Island, two new endemic in the subgenus Metioche (Superstes) are considered critically endangered due to loss, though restoration efforts have enabled their persistence.