Xizicus (Eoxizicus) robustocercus Gorochov, 2022

Gorochov, A. V., 2022, Taxonomy of the katydids (Orthoptera: Tettigoniidae) from East Asia and adjacent islands. Communication 15, Far Eastern Entomologist 459, pp. 1-26 : 6-9

Xizicus (Eoxizicus) robustocercus Gorochov , sp. n.

https://zoobank.org/NomenclaturalActs/ 690FBD3C-8CED-4727-9681-245C0FE8AA49

Figs 14–20

MATERIAL. Holotype – ♂, Vietnam: Kon Tum Prov., Kon Plong Distr., Kon Plinh

Commune (near Xa Hien Vill.), 14º36.190ʹN, 108º28.885ʹE, 950 m, forest, 15–23. VI.2014,

N. Orlov, L. Iogansen ( ZIN). Paratypes: 1 ♂, 2 ♀ , same data as for holotype ( ZIN) .

DESCRIPTION. Male (holotype). General appearance typical of this subgenus. Body coloration light greenish with greyish eyes, a pair of narrow light brown stripes along lateral edges of pronotal disc (in apical part of this disc, these stripes located very near each other),

yellowish to light brown spines and spurs of fore and middle tibiae, brown to dark brown spines body from side and slightly above (14, 24). Male abdominal apex from above and slightly behind (15), from above (25), from behind (16), from below (17, 26) and from side (18, 27);

right male cercus from behind (21); part of male genital plate visible from above (22). Female genital plate from below (19, 28); ovipositor from side (20, 23, 29).

and spurs of hind tibia, light brown to brown areas on subapical tarsal segments, and yellowish cerci and epiproct ( Figs 14–18 ). Upper rostral tubercle gradually narrowing to narrowly rounded apex and with slight dorsomedian groove; shape of pronotum as in Fig. 14 . Spine of fore coxa about 0.35 mm in length; both tympana (outer and inner) oval and rather large,

almost equal in size ( Fig. 14 ); fore tibia with four pairs of ventral spines and one outer subapical spine (latter spine clearly shorter than previous spines; Fig. 14 ). Tegmina reaching subapical parts of hind tibiae and with normal stridulatory apparatus ( Fig. 14 ); hind wings clearly protruding beyond tegminal apices (their exposed distal parts ~ 1.8 mm in length).

Last abdominal tergite ( Fig. 15 ) with wide, short and rounded notch dorsally; a pair of rather small and rounded (almost finger-like but short) lobules located between posterior edge of above-mentioned tergite and epiporoct (space between these lobules moderately wide; Figs

15, 18); cerci ( Figs 15, 16, 18 ) moderately large but rather short, stout, slightly curved upwards, with thick cylindrical proximal part, almost lamellar and elongate but comparatively short distomedial lobe (this lobe with almost straight but obliquely situated distomedial edge), and distinctly narrower and also almost lamellar distolateral lobule (this lobule curved medially and slightly upwards); genital plate moderately small, clearly shorter than cercus,

more or less wide in proximal half, distinctly narrowing to almost truncate apex in distal half

(this half with concave lateral edges), and with a pair of small styles around above-mentioned apex (approximately as in Fig. 17 ); genitalia membranous.

Variations. Second male with darkish stripes along lateral edges of pronotal disc shortly interrupted, lobules between last tergite and epiproct yellowish, exposed distal parts of hind wings about 0.9 mm in length, and genital plate having slightly convex apical edge between styles ( Fig. 17 ).

Female. Structure and coloration of body as in males, but: tegmina without stridulatory apparatus; last tergite yellowish, somewhat narrower, divided into two halves by angular posteromedian notch and by distinct dorsomedian groove before this notch, and without lobules near epiproct; cerci small and rather thin, cylindrical but with very thin apical parts

(cerci slightly longer than width of space between their bases); epiproct small and oval, i.e.

slightly elongate but not longer than visible parts of last tergite; genital plate longer than wide, with lateral parts vertical and forming almost keel-like structures along lateral edges of ventral part, and with this ventral part more or less flattened and barely widening to distinct roundly angular posteromedian notch (this ventral part also with rather deep fold along edge of this notch; Figs 19, 20 ); ovipositor normal for this genus, long, rather thin, barely curved upwards and with apex as in Fig. 20 .

MEASUREMENTS. Length (in mm). Body: ♂ 12.5–13, ♀ 11–12; body with wings: ♂

25–26, ♀ 25.5–26.5; pronotum: ♂ 3.9–4.2, ♀ 3.7–3.9; tegmina: ♂ 19.8–20.5, ♀ 20.3– 21;

hind femora: ♂ 10.5, ♀ 10.5–11; ovipositor 10.3–10.7.

COMPARISON. The new species is somewhat similar to X. (E.) dao Gorochov, 1998 , X.

(E.) duplum Gorochov, 1998 , X. (E.) orlovi Gorochov, 2005 and X. (E.) ryabovi Gorochov,

2005 from Vietnam as well as to X. (E.) kulingensis (Tinkham, 1943) , X. (E.) tuberculatus

(Liu et Zhang, 2000), and X. (E.) hainani Gorochov et Kang, 2005 from China in the shape of the male cerci. But X. robustocercus sp. n. is distinguished from all these congeners by the distolateral lobules of the male cerci distinctly shorter; additionally, it differs from X. dao and

X. duplum in the male genital plate shorter and wider, from X. kulingensis and X. ryabovi in the distomedial lobes of these cerci with less distinct projections, and from X. orlovi in the proximal part of these cerci without additional dorsomedial keels. From Vietnamese X. (E.)

danangi Gorochov, 1998 and X. (E.) hue Gorochov, 2005 with unknown males, the new species differs in the structure of the female genital plate: in X. danangi , the distal portion of this plate less high and with the apical part widely truncate (not clearly notched); in X. hue ,

this plate with distinctly more concave lateral parts and a clearly less deep posteromedian notch.

However, the male with very similar cerci was later attributed to X. hue (Gorochov, 2011: figs

30–32), but this attribution is somewhat problematic, and the cercus of this male is distinguished from that of X. robustocercus sp. n. by the distomedial lobe larger, its ventroproximal corner more projected backwards, its dorsodistal corner almost lobule-like and located more near the distolateral cercal lobule, and the notch near the latter lobule clearly smaller (compare Figs 16 and 21 ).

ETYMOLOGY. This species name originates from the Latin word “robustus” (robust,

stout) and the Latinized Greek morphological term “cercus” due to the shape of the male cercus.

Figures

Figs 14–29. Xizicus spp.: 14–20 – X. (Eoxizicus) robustocercus sp. n.; 21 – X. (E.)?hue Gor.; 22, 23 – X. (E.) orlovi Gor.; 24–29 – X. (E.) bothrocercus sp. n. Anterior half of male