Odontogryllini de Mello, 1992

Oya, Beatriz Harumi Kondo, Santos, Luiz Augusto Padilha, Fernandes, José Antônio Marin & Tavares, Gustavo Costa, 2024, Contributions to Odontogryllini (Orthoptera: Gryllidae: Landrevinae) with comments on its taxonomic status and description of a new species of Xulavuna de Mello & Campos, 2014, Zootaxa 5424 (2), pp. 203-213 : 205

Tribe Odontogryllini de Mello, 1992

Comments. Odontogryllini is the only tribe within Landrevinae known to occur in America, while Landrevini occurs in Indo-Malayan and Austro-Papuan regions and Prolandrevini in Afro-Madascan regions ( Gorochov 2016). The diagnostic characters initially proposed by de Mello (1992) were subsequently updated by Gorochov (2013, 2016, 2023). The latter author commented that most of the characteristics de Mello (1992) proposed are common to other Landrevinae tribes. Still, he suggested that the structure of the stridulum, which is straight or slightly arcuate but never S-shaped (as in Landrevini), and the absence of spines between the dorsal outer spurs of the hind tibia (present in Prolandrevini) are important taxonomic characters to distinguish the Odontogryllini . Gorochov (2016) mentions that these characteristics were not discussed when Campos & de Mello (2014) synonymized Odontogryllini under Landrevini, and we agree.

According to Campos & de Mello (2014), the genera included in Odontogryllini also have a characteristic that has only been seen in Neotropical Landrevinae until then: that is, ambidextrous stridulation. The authors mention that the singing species have stridulatory files on both ventral faces of the tegmina. However, this characteristic is common in crickets and is considered an ancestral condition ( Béthoux 2012; Chamorro-Rengifo et al. 2014), and no observation nor song record of ambidextrous stridulation was presented. Therefore, it is hard to ensure if the presence of a stridulatory file on the left wing in Odontogryllini is evidence of ambidextrous stridulation.

De Mello (1992) suggested that, in Odontogryllini , the hind tibia has four to six dorsoproximal outer spurs and two inner ones. However, we find specimens with eight outer and none to four inner spines. Although the number of dorsoproximal spines may vary, the outer margin always has more spines. But this is a characteristic also found in Landrevini. Nevertheless, besides the stridulatory file format, we suggest another characteristic to distinguish these tribes: the structure of the rami (R). In Odontogryllini , the R is large, like an enlarged plate; it may be slightly incurved but never strongly convergent. On the other hand, in Landrevini, the R is elongated, like a bar or rodshaped, usually convergent and, sometimes, almost touching. The enlarged R of Odontogryllini is shared with Prolandrevini, but this last has dorsal spines between the outer spurs of the hind tibia ( Gorochov 2016).

Gorochov (2023) commented that Titanogryllus Jaiswara, Souza-Dias, Desutter-Grandcolas & de Mello, 2018 possibly belongs to Odontogryllini , arguing that the structure of the male genitalia was not well-described and is clearly different from that of Gryllinae . However, the R in Titanogryllus is elongated, bent toward the ventral side, strongly curved and almost touching. If this genus was moved to Landrevinae , it should be placed within Landrevini, not Odontogryllini . However, we disagree that this genus should be moved to Landrevinae /ini. In Titanogryllus , the stridulum is not S-shaped, and the female ovipositor is typical of Gryllinae , with a laterally compressed apex. In Landrevinae , the female ovipositor apex is dorsoventrally compressed and triangular, like a spear.