Zygometapodus, Brailovsky, 2018

Brailovsky, Harry, 2018, Descriptions of Zygometapodus gen. nov. and a new species of Stenometapodus (Hemiptera: Heteroptera: Coreidae), Acta Entomologica Musei Nationalis Pragae 58 (1), pp. 143-149 : 145-148

Zygometapodus gen. nov.

Type species. Stenometapodus castaneus Blöte, 1938, here designated.

Description. Body medium sized to large, over 20.00 mm.

Head wider than long across eyes, quadrate, not declivent, and dorsally flat; tylus projecting beyond juga as strongly compressed plate, with apex extending forward as a single subacute rectangular projection; juga apically globose, apices not visible from above, deflexed below antenniferous tubercle; antenniferous tubercle protruding, unarmed; posttylar sulcus simple, deep; antennae shorter than total body length; antennal segment I stouter than segments II to IV, slightly curved outward, longer than maximal length of head, with inner face longitudinally ridged. Antennal segments II and III cylindrical, IV fusiform; antennal segment I longer than II, III the shortest and segment IV the longest, subequal to II and III combined. Ocelli slightly raised, close to eye; preocellar pit small, deep; eyes hemispheric, protuberant; postocular tubercle moderately exposed. Bucculae short, nearly semicircular, elevated, not projecting beyond antenniferous tubercle, not spinose. Rostrum short, reaching posterior border of mesosternum or anterior border of metasternum.

Thorax. Pronotum. Wider than long, trapezoid, declivent, narrowed anteriorly and diverging posteriorly to form a prominent spinose humerus; collar clearly demarcated; frontal angles obtuse; anterolateral margins obliquely straight, finely nodulose; humeral angles remarkably spinose, each spinose projection apically acute, directed backward; anterior half of posterolateral margins serrate, posterior half smooth; posterior margin straight; triangular processes absent; callar region flat, not clearly differentiated, scarcely punctate; anterior lobe of pronotal disk smooth, posterior lobe densely punctate, striate, with shallow median longitudinal ridge. Prosternum deeply concave; meso-, and metasternum not sulcate; metapleural supracoxal spine hard to see in males, absent in females; metathoracic scent gland peritreme with two completely separated auricles. Legs. Male hind trochanter with two ventral tubercles near apex, smooth in females; fore and middle femora slender, ventrally armed with two rows of spines, and dorsally smooth; hind femora strongly incrassate in males, slightly in females, conspicuously surpassing the apex of abdomen, ventrally with two rows of spines, and dorsally with one to three rows of stout to acute spines; inner and outer surface of male hind femora longitudinally sulcate, in female gently and not easy to see. Fore and middle tibiae cylindrical, sulcate, and unarmed; hind tibiae longer than abdomen, inner and outer surface expanded, widely in females, more narrowly in males; inner expansion spinose in each sex; outer expansion smooth in each sex; inner and outer expansion in each sex extending 23% of the maximal length of hind tibiae. Scutellum longer than wide, apically subacute; disk flat, triangular, coarsely and transversely striated, and clothed with erect and decumbent setae. Hemelytra macropterous, extending beyond the apex of the last abdominal segment; clavus and corium finely and densely punctate; veins prominent.

Abdomen. Connexivum raised above terga; upper surface smooth in each sex; posterior angle of segment V and VI with a short acute spine; abdominal terga without medial furrow; abdominal spiracles closer to anterior border of each sternite. Male genitalia. Genital capsule. Posteroventral edge with lateral angles rounded, and area between them provided with a small sized concavity, extending dorsally, into shallow, medially flattened tongue. Female genitalia. Abdominal sternite VII with plica and fissure; plica transversally rectangular, narrow, just reaching anterior margin of sternite VII; gonocoxae I triangular, apically rounded, in caudal view close each other; paratergite VIII subtriangular with spiracle visible; paratergite IX squarish, longer than VIII.

Differential diagnosis. The new genus has affinities with Stenometapodus by having the hind tibiae expanded; connexival segments V and VI with a short acute spine; antennae shorter than total body length; antennal segment IV being the longest; collar present, well demarcated; pronotal disk without tubercles; hind tibiae longer than abdomen; humeral angles spinose, apically acute; and mesosternum and metasternum not sulcate.

In Zygometapodus , the metathoracic scent gland peritreme is bilobed, with two completely separated auricles; the antennal segment IV subequal to segments II and III combined; connexival segments III to VII in males with upper surface smooth; the callar region slightly punctate; the triangular process of pronotum absent; the anterior half of posterolateral margin of pronotum serrate, and posterior half smooth; and in females the abdominal sternite VII has plica and fissure; the plica transversaly rectangular, narrow, and just reaching the anterior margin of sternite VII.

In Stenometapodus , the metathoracic scent gland peritreme has a single auricle; the antennal segment IV shorter than segments II and III combined; connexival segments III to VII in males densely covered with large to short spines; the callar region impunctate; the triangular process of pronotum elongate or short and acute; anterior and posterior margin of the posterolateral margins of pronotum serrate and nodulose; and in females the abdominal sternite VII with plica; fissure scarcely visible; plica quadrate, broad, reaching apical third of sternite VII.

Etymology. The new genus is named for its similar appearance to Stenometapodus . The word is composed of the Greek prefixes zygo - (for union or pair) and meta - (posterior), and the noun poús (= foot, leg), latinized. The gender is masculine.