Thiasophila

Kraatz, 1856

Thiasophila is a of myrmecophilous rove beetles (Staphylinidae: Aleocharinae) that inhabit colonies, primarily those of the Formica rufa group. Species in this genus have evolved specialized adaptations for living among ants, including defensive secretions and morphological plasticity in stages. The genus contains at least three European species: T. angulata, T. lohsei, and T. szujeckii, with T. szujeckii being a recently described cryptic species from Poland.

Pronunciation

How to pronounce Thiasophila: /ˌθaɪ.əˈsɒf.ɪ.lə/

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Identification

of Thiasophila are small rove beetles with reduced exposing most of the . T. szujeckii can be distinguished from the similar T. angulata and T. lohsei by body size, coloration, ligula structure, , parameres, and spermatheca ; COII mitochondrial gene sequences confirm this distinction. is present in habitus, structure, and the eighth abdominal tergite and sternite.

Habitat

Colonies of ants in the Formica rufa group, including Formica polyctena, F. rufa, and F. truncorum. The new species T. szujeckii has been found exclusively with F. truncorum.

Distribution

Europe (including Denmark, Norway, Sweden, Poland) and Northern America. Specific distribution records from GBIF include Denmark, Norway, and Sweden.

Host Associations

  • Formica polyctena - T. angulata larvae observed with this
  • Formica rufa - T. angulata larvae observed with this
  • Formica truncorum - T. angulata and T. szujeckii associated with this ; T. szujeckii exclusive to this host

Life Cycle

, three larval instars, , and pupa (enclosed within a pupal cocoon). Mature larvae of T. angulata exhibit -related morphological variation in body length, and pronotum width, and antennal structure depending on which they inhabit.

Behavior

Myrmecophilous, living within colonies. and larvae produce defensive secretions. Larvae show morphological plasticity in response to different ant .

Ecological Role

Myrmecophile; the nature of the relationship with ants (whether inquilinism, commensalism, or ) has not been fully characterized in available sources.

Similar Taxa

  • AthetiniLarvae of Thiasophila angulata have been compared morphologically with larvae of this tribe, which also contains myrmecophilous Aleocharinae
  • LomechusiniLarvae compared in morphological studies; this tribe includes well-known myrmecophilous rove beetles with which Thiasophila shares ecological similarities
  • Pella laticollisPupal compared with T. angulata in morphological studies of Aleocharinae development

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