Velarifictorus (Velarifictorus) landrevus Ma, Qiao & Zhang, 2019

Zheng, Yan-Na, Cai, Xin-Ru & Ma, Li-Bin, 2022, Taxonomy of Landrevus species group of Velarifictorus Randell, 1964 (Orthoptera, Gryllidae, Gryllinae) with one new species and morphological diversity of Velarifictorus flavifrons Chopard, 1966, ZooKeys 1084, pp. 101-117 : 101

Velarifictorus (Velarifictorus) landrevus Ma, Qiao & Zhang, 2019

: 兰斗蟋 Figures 5 , 6 , 7 , 8B, E , 9B, E , 10B, E , 13B, E , 14C, D

Velarifictorus (Velarifictorus) landrevus Ma, Qiao & Zhang, 2019: 104

Examined material.

5 males and 2 females, Yunnan, Mengla, Wangtianshu, 21°59.7'N, 101°58.8'E, X-12-23-2014, Zhang, Tao leg. The specimens were collected on grasses or leaf litter of a hillside.

Measurements.

Male (n = 5): BL 19.49 ± 0.60, HL 3.71 ± 0.23, HW 6.52 ± 0.31, PL 4.47 ± 0.19, PW 6.20 ± 0.23, FWL 9.32 ± 0.98, MTL 5.42 ± 0.22, HFL 13.82 ± 0.26; Female (n = 2): BL 18.59 ± 0.09, HL 3.71 ± 0.56, HW 5.81 ± 0.24, PL 4.61 ± 0.02, PW 6.34 ± 0.08, FWL 4.72 ± 0.14, HFL 13.93 ± 0.23, OL 13.68 ± 0.41.

Description.

Male: vertex broad and flattened, slightly inclined. Occiput slightly convex and almost as wide as pronotum. Frontal rostrum convex, inclined dorsally and ventrally, nearly1.5 times wider than antennal scape. Antennal scape shield-like. Ocelli transversely ovoid, almost equal in size. Eyes ovoid, about 1/5 length of head. Postclypeus shaped as narrow band, anteclypeus shaped as broad shield. Labrum shaped as rhombus, apical margin slightly round. End section of maxillary palpi almost as long as the third; end section of labial palpi depressed and widened, almost equal to the total length of remainder sections.

Pronotum broad and flattened. Median groove of pronotal disc distinct. Posterior margin straight and middle of anterior margin concave, and both margins almost equal in width.

Tegmina not reaching apex of abdomen. Chord veins two. Diagonal vein proximally bifurcated, one branch of connected to the proximal of chord vein, while another branch connected to CuA vein. Mirror shield-like, anterior margin and the posterior almost equal in width. Apical field about 1/5 length of basal field, possessing two or three wing cells.

Inner tympanum absent; external tympanum elongate-oval. Hind tibiae armed with dorsal spurs (numbered 6:6) almost equal in length; and apical spurs three outside (the dorsal one slightly longer than the dorsal spurs, the ventral and middle almost equal in length and about half length of the dorsal) and inner two (equal in length and about two times longer than the dorsal).

Genitalia.

Lateral lobes of epiphallus sheet-like, tapering, apically truncated, and pilose along margins. Middle lobe of epiphallus partially pentagon-like (dorsally viewed) and about half length of lateral lobes. Ectoparamere stripe-like, proximally broad, tapering, upward curved, and about twice as long as epiphallic lateral lobes.

Calling song.

Chirps lasting from 3.023 to 6.463 s (mean 4.384) and their duration varying from 0.394 to 0.553 s (mean 0.474). Each chirp equally contains 12 pulses (Fig. 5B ). The peak frequency is between 2.383 and 5.347 kHz (mean 3.865) and the mean temperature is 27.8 °C. Regarding spectro-temporal variation, the frequency modulation is inclined downward (Fig. 5C ).

Female. Resembles the male. Tegmina reaches the apex of the second abdominal tergite (Fig. 6B ) and is armed with longitudinal veins (inside shorter and progressively growing outward), dorsally four longitudinal veins, and laterally six Sc branches (the innermost of which medially and apically branched) (Fig. 13E ). Ovipositor arrow-shaped, constricted, long, and with a somewhat sharp tip (Fig. 14 C, D ).

Coloration.

Body chocolate brown. Head dark brown. End section of maxillary palpi light yellow. Cercus and legs yellowish brown. CuA and Sc of female ornamented with yellowish band.

Figures

Figure 5. Calling song of Velarifictorus landrevus A oscillogram of chirp (amplitude versus time) B oscillogram of pulse (amplitude versus time) C spectrogram (frequency versus time).

Figure 6. Bodies of Velarifictorus landrevus A male B female. Scale bars: 10 mm.

Figure 7. Genitalia of Velarifictorus landrevus A dorsal view B lateral view C ventral view.

Figure 8. Front view of heads of Velarifictorus A, D V. zhengi sp. nov. B, E V. landrevus C, F V. flavifrons A-C male D-F female.

Figure 9. Dorsal view of heads and pronotum of Velarifictorus A, D V. zhengi sp. nov. B, E V. landrevus C, F V. flavifrons A-C male D-F female.

Figure 10. Lateral view of heads of Velarifictorus A, D V. zhengi sp. nov. B, E V. landrevus C, F V. flavifrons A-C male D-F female.

Figure 13. Right tegmina of Velarifictorus A, D V. zhengi sp. nov. B, E V. landrevus C, F V. flavifrons A-C male D-F female.

Figure 14. Ovipositor of Velarifictorus A, B V. zhengi sp. nov. C, D V. landrevus E, F V. flavifrons A, C, E inside of ovipositor B, D, F outside of ovipositor.