Trigonidomorpha Chopard, 1925

Trigonidium (Trigonidomorpha): Chopard, 1925: 40; Otte, 1994: 46; Gorochov et al., 2018: 317.

Trigonidomorpha: Chopard, 1968: 328; Chopard, 1969: 288; Desutter-Grandcolas et al., 2016: 416.

Trigonidiomorpha (misspelling): Baehr, 1989: 20.

Type species: Trigonidomorpha sjostedti Chopard, 1925

The stridulatory apparatus is partly reduced in this genus: with stridulatory file but without distinct mirror. There are currently 11 species: 2 described from Australia, 6 from Africa, 2 India / Sri Lanka, and 1 from Indian Oceanic islands. Originally described as a subgenus of Trigonidium s. l. (Chopard, 1925), Chopard (1968) raised it to a generic status before Otte (1994) restored it as a subgenus again. More recently, Desutter-Grandcolas et al. (2016) restored Trigonidomorpha as a separate genus based on the phylogenetic analyses by Chintauan-Marquier et al. (2016). However, Gorochov et al. (2018) only considered convergence in the male genitalia and resurrected Trigonidomorpha as a subgenus of Trigonidium s. l.