Tachinus

Gravenhorst, 1802

Tachinus is a of () comprising at least 120 described distributed across the Northern Hemisphere. Species are typically moderate in size (body length 3.5–5 mm) with to black coloration and often yellowish margins on the and . The genus exhibits substantial morphological diversity, with species groups distinguished by body form, development, and genital characters. Some species groups show pronounced in elytral length and microsculpture.

Tachinus subterraneus by (c) Alexis Tinker-Tsavalas, some rights reserved (CC BY), uploaded by Alexis Tinker-Tsavalas. Used under a CC-BY license.

Tachinus basalis by no rights reserved, uploaded by Nick Bédard. Used under a CC0 license.

Tachinus fimbriatus by (c) Christian Back, some rights reserved (CC BY), uploaded by Christian Back. Used under a CC-BY license.

Pronunciation

How to pronounce Tachinus: /ˈtæ.kɪ.nəs/

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Identification

Identification to requires examination of male , male and female eighth abdominal and tergites, and male seventh sternite. Species groups are distinguished by body form, development, and antennal length. The is divided into 17 species groups based on morphological characters. are available for regional faunas (North America, China) but no comprehensive world key exists.

Images

Habitat

varies by group. The silphaeformis-group occurs in mixed coniferous forests, above forest margin in litter of Rhododendron and other subalpine shrubs, and in alpine meadows. Many species occur at high elevations, with some Chinese species found mostly above 2,500 m. The apterus-group is associated with tundra and regions.

Distribution

Holarctic distribution. North and Central America (44 recognized ), Palearctic including Europe, Siberia, and China (numerous species, with high diversity in Sichuan, Qinghai, Tibet, and other mountain regions). Records from Denmark, Norway, Sweden, and the northeastern United States (Vermont).

Behavior

in elytral characters has been documented in the silphaeformis-group, with differences in length, margin shape, and microsculpture between males and females.

Similar Taxa

Other Tachyporinae generaTachinus is distinguished by its crab-like appearance, specific genital characters, and the structure of male seventh and eighth abdominal . Related in Tachinusini differ in body proportions and detailed genital .

More Details

Taxonomic complexity

The is taxonomically complex with 17 recognized groups. Subgenera Drymoporus Thomson and Porodrymus Rey have been synonymized with Tachinus. Numerous recent revisions have described new species, particularly from China, indicating the fauna remains incompletely documented.

Collecting methods

According to revisionary work on North , specific are employed for Tachinus, though details were not elaborated in available sources.