Atlanticus (Sinpacificus) helleri, Cheng, Kun, Wang, Xue-Song, Liu, Chun-Xiang & Wu, Chao, 2016

Cheng, Kun, Wang, Xue-Song, Liu, Chun-Xiang & Wu, Chao, 2016, Description of two new species of the genus Atlanticus from Southern China and their songs (Orthoptera: Tettigoniidae; Tettigoniinae), Zootaxa 4103 (5), pp. 473-480 : 479

Atlanticus (Sinpacificus) helleri sp. nov., Liu, Wang & Cheng

(Figs. 1B, D, F; 2FB, D; 3D–F, H)

http://lsid.speciesfile.org/urn:lsid: Orthoptera .speciesfile.org:TaxonName:476683

Holotype. Male (No. JF343), China: Jiangsu Prov.: Park of Chanzhou City, 2014. VII.7, Coll. Jiangye.

Paratype. 1 male (No. JF335), same data as in holotype.

Diagnosis. Small-sized compared to the congeners in the Pieli group of the subgenus Sinpacificus. Proximal three quarters of stridulatory file on underside of left tegmen with 48 distinct stridulatory teeth which gradually becoming larger centrad (Fig. 1B). Mirror length and width (1.3mm, 1.3mm) (Fig. 6D). Greatest length of secondary mirror (3.1mm), smallest length of secondary mirror (1.1 mm) (Fig. 6D).

Description. Holotype. Male. Disc of prozona slightly convex, and metazona approximately flat behind. Narrowest in first transverse sulcus or at basal one sixth, and then gradually amplified caudad. Lateral lobes of pronotum deepest in basal one third area; anterior margin very slightly concave, posterior margin oblique with a very indistinct central concavity, ventral margin aslant caudad to posterior angle. Tegmen amplified, extending to the eighth abdominal tergum. Tegmen with clear longitudinal and cross veins; radial vein giving out two branches in apical one third part, median vein flat dorsal and lateral planes at right angles to each other; lateral plane deepest in apical one third part (Fig. 1F).

Leg spination. Fore femora with 2 interior ventral spines. Middle femur with 1–2 external ventral spines in apical half. Hind femur with 4 interior spines on ventral margin in central three quarters area. Fore tibiae with 3 dorsal spines on exterior margin and 5 ventral spines on both margins; middle tibiae with 6 ventral spines on both margins, 1 exterior and 3 interior spines on dorsal margins; hind tibiae with 22 exterior and 26 interior spines on dorsal margins.

Tenth abdominal tergum with a broad central “U”-shaped notch cleft in apical one-third (Fig. 2B). Cerci robust, short, of even width to small uncinate internal median tooth; apical half gradually constricted and slightly incurved, with a bluntly pointed tooth. Subgenital plate with a wide “U”-shaped notch between styli; notch slightly shorter than half length of styli (Fig. 2D).

Female unknown.

Coloration. Generally reddish brown. The following parts shining blackish brown: lateral surfaces of fastigium of vertex; basal and apical quarter of each lateral lobe of pronotum with exception of the white lower stripe; upper area of lateral surface of posterior thorax, and basal one third radial areas between radial and subcostal veins; lateral surface of fore femur, and basal stripe of dorsal surface of fore femur; discontinous spots between upper and lower halves of hind femur. Tegmen brown. Stripe in lower quarter area of lateral lobe of pronotum and costal area of tegmen white. Ventral surface of abdomen reddish brown.

Measurement of male (mm). Length of body: 26; length of pronotum: 10.15–10.52; width of pronotum: 4.6– 5.52; length of fore femur: 7; length of middle femur: 8; length of hind femur: 26.45–26.62; length of tegmen: 13.48–13.81; width of tegmen: 3.92–4.27.

Song (Figs. 3D–F, H). The calling song consists of regular repeated units or echeme series (Figs. 3D–F). The frequency ranges from 1 to 20 kHz, and the frequency of main peak is about 6 kHz and that of second peak is about 9kHz (Figs. 3H). Each echeme consists of numerous syllables. The important parameters are listed (Table 1).

Notes. The new species also belongs to the Pieli group in Tinkham (1941). It most resembles A. (S.) kiangsu Ramme and A. (S.) pieli Tinkham in the small size and short tegmen, but differs from A. (S.) kiangsu , A. (S.) pieli and other congeners in the Pieli group by the shape and length of pronotum, much less number of stridulatory teeth and details of male abdominal apex especially shape of notch of tenth abdominal tergum.

Etymology. The new species is named after Dr. Klaus-Gerhard Heller, Germany for his great contributions to the bioacoustics of Tettigoniidae .

Distribution. China (Jiangsu).