Diestramima Storozhenko, 1990

Genus Diestramima Storozhenko, 1990 View in CoL

Type species: Diestrammena palpata Rehn, 1906 , by original designation.

Note. The genus was considered in the first communication of this article where the key to its species and subspecies was also published ( Gorochov & Storozhenko, 2015). Later, two additional papers with descriptions of new representatives of this genus appeared ( Qin et al., 2016; Zhu & Shi, 2018). From the both genera previously discussed in this communication ( Megadiestramima and Mimadiestra ), Diestramima differs in the presence of only posteromedian process of seventh abdominal tergite in male which is significantly longer, completely covering paraprocts and their processes (vs. there are a pair of posterior spines or projections on this tergite, or the above-mentioned posteromedian process is distinctly shorter than paraprocts and almost not covering them or covering the paraproctal bases only; for comparison see Figs 1, 2, 6, 7, 11, 12, 15, 16, 21, 22, 25, 26, 29, 30, 34, 35, 58, 59, 62, 63, 66, 67, 72, 75, 76, 80–83 and 88, 89, 94), as well as in the male genitalia having additional lateral membranous lobes distinct also in proto- and deutonymphs ( Figs 98–103) [probably, it is a unique character for imago of this genus (compare with Figs 111–120), but in Megadiestramima , protonymphs may be with similar additional lobes ( Figs 104, 105) which are partly or strongly reduced in older nymphs ( Figs 106, 107, 109, 110) and indistinct in imago ( Fig. 108)]. Here, the genus Diestramima is divided into three subgenera which are in partial accordance to the first and second groups of this genus established by Gorochov (1998): Diestramima s. str.; Baculitettix subgen. nov.; Excisotettix subgen. nov. However, some species of this genus described by Gorochov & Storozhenko (2015), Qin et al. (2016), Zhu & Shi (2018) and listed in OSF are here not includ- ed in any subgenera, because these species are in need of an additional study. Differences between these three subgenera are given below, in the subgeneric key of Diestramima s. l.

1. Male: paraproct stick-like (i.e. rather long and thin) but with slightly or moderately higher proximal part ( Figs 88, 89). Female: distal part of genital plate from roundly truncate to almost angular, or with small posteromedian notch ( Fig. 93).............................. Baculitettix View in CoL subgen. nov. [Type species: Diestramima major Gorochov, 1998 View in CoL . Etymology: this subgeneric name consists of the Latin word “baculum” (stick) and generic name Tamdaotettix View in CoL . Other species included: Diestrammena cryptopygia Chopard, 1918 View in CoL ; D. tsongkhapa Würmli, 1973 View in CoL ; Diestramima minor Gorochov, 1998 View in CoL ; D. propria Gorochov et Storozhenko, 2015 View in CoL ; D. beybienkoi Qin, Wang, Liu et Li, 2016 View in CoL ; D. tibetensis Qin, Wang, Liu et Li, 2016 View in CoL ; D. subtilis Zhu et Shi, 2018 View in CoL ; possibly D. distincta Gorochov, 2010 View in CoL , D. triangulata Qin, Wang, Liu et Li, 2016 View in CoL and D. cycla Zhu et Shi, 2018 View in CoL ]

– Male: paraproct rather short and usually high (plate-like), with distal part truncate ( Fig. 94), angular or having hooks and/or teeth (spinules); or paraproct moderately short, almost S-shaped in profile, with proximal and distal parts more or less equal to each other in height, and with angular or almost spinose apex. Female: genital plate diverse. ............................................. 2

2. Male: paraproct rather short and usually high (plate-like), with distal part truncate ( Fig. 94), angular or having hooks and/or teeth (spinules). Female: genital plate almost as in Baculitettix View in CoL (see thesis 1)..................... Diestramima View in CoL s. str. [Included species: type species; Diestramima vietnamensis Gorochov, 1998 View in CoL ; D. austrosinensis Gorochov, 1998 View in CoL ; D. hainanensis Gorochov et Storozhenko, 2015 View in CoL ; D. bispinosa Gorochov et Storozhenko, 2015 View in CoL ; D. hamata Gorochov et Storozhenko, 2015 View in CoL ; D. excavata Qin, Wang, Liu et Li, 2016 View in CoL ]

– Male: paraproct moderately short, almost S-shaped in profile, with proximal and distal parts more or less equal to each other in height, and with angular or almost spinose apex. Female: genital plate with rather large posteromedian notch and angular projections around this notch............................................ Excisotettix View in CoL subgen. nov. [Type species: Diestramima intermedia Liu et Zhang, 2001 View in CoL . Etymology: this subgeneric name consists of the Latin word “excisus” (with notch) and generic name Tamdaotettix View in CoL . Other included species: D. subrectis Qin, Wang, Liu et Li, 2016 View in CoL ; D. guangxiensis Qin, Wang, Liu et Li, 2016 View in CoL ; D. acutiapicis Zhu et Shi, 2018 View in CoL ; possibly D. bina Zhu et Shi, 2018 View in CoL ]