Family (Alpha): ACRIDIDAE GRYLLACRIDIDAE GRYLLIDAE GRYLLOTALPIDAE RHAPHIDOPHORIDAE ROMALEIDAE TETRIGIDAE TETTIGONIIDAE TRIDACTYLIDAE
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Anaxipha thomasi Walker & Funk, 2014 - Thomas's Trig
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Taxonomy
Family: Gryllidae
Subfamily: TrigonidiinaeTribe: TrigonidiiniSynonym: Anaxipha n. sp. D Comments: One of thirteen species in this genus that occur in North America north of Mexico (SINA, 2017); nine have been recorded in North Carolina. Thomasi belongs to the Exigua Species Group, which also includes exigua, tinnula, tinnulacita, and tinnulenta in North Carolina (Walker and Funk, 2014).
Identification
Field Guide Descriptions: Online Photographs: SINA, Google Images ,
iNaturalist , GBIF Technical Description, Adults/Nymphs: Walker and Funk (2014)SINA 630a.htm Comments: A very small, brown Trig. Like other members of the Exigua group, it possess a broad dark stripe on the lateral face of the femur (Walker and Funk, 2014). Structural features -- particularly the number of pegs on the stridulatory file -- must be examined to identify this species; the song is distinctive.Total Length [body plus wings; excludes ovipositor]: 5.5-5.9 mm, males; 6.1-7.1, females (Walker and Funk, 2014)Structural Features: "Stridulatory file with about 150 teeth (range 139-162). Length of ovipositor <2.2 mm" (see Walker and Funk, 2014 for additional structural characteristics). No macropterous individuals have been observed but the sample size is still fairly small.Singing Behavior: The song of thomasi is a continuous trill, with a rate of ~21 syllables produced per sec at 77°F (7.8 kHz) (Walker and Funk, 2014). Among the species of Anaxipha with similarly continuous songs, this rate falls in between A. tinnulacita (13.2 syllables per sec. at 77°F) and A. exigua (43.6 syllables per sec. at 77°F). This rate is also lower than that of Allonemobius walkeri, which has a frequency of 26.5 syllables per sec. at 77°F (7.9 kHz) (Hershberger, 2021). The songs of that species are also broken at much more frequent, irregular intervals and are always produced from the ground rather than from perches up in the vegetation.Recording playback at normal speed.
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Nymphal Stages and Development: Apparently undescribed but unlikely to be distinguishable, particularly from other members of the Exigua Species Groups
Distribution in North Carolina
County Map: Clicking on a county returns the records for the species in that county.
Adult Dates: Click on graph to enlarge
Habitats and Life History
Habitats: This species appears to be particularly tied to pine forests (Walker and Funk, 2014) and our records come from stands dominated by Shortleaf Pine with some Scrub Pine also present. Diet: Apparently unrecorded; possibly omnivorousObservation Methods: Singing males are most easily detected but they may also be captured using sweep nettingAbundance/Frequency: We currently have too few records for this species to estimate either its frequency of occurrence or abundanceAdult Phenology: Walker and Funk (2014) report that this species is univoltine, appearing in late summer and persisting into the fall. Our records are all from mid-September, consistent with this phenology.
Status in North Carolina
Natural Heritage Program Status: [W3]Natural Heritage Program Ranks: [GNR] S2S4State Protection: Has no legal protection, although permits are required to collect it on state parks and other public landsComments: This recently described species is still too poorly known across its range to estimate either its global or state conservation status. Its occurrence in stands of upland pine forests suggests, however, that it may be fairly secure. However, that remains to be confirmed.
Image Gallery for Anaxipha thomasi - Thomas's Trig Recorded by: Steve Hall Recorded by: Steve Hall Recorded by: Steve Hall
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