Kibakoganea canhcamsung Do

Do, Cuong, 2013, Description of a new species of Kibakoganea from Vietnam (Coleoptera: Scarabaeidae: Rutelinae: Rutelini), Zootaxa 3683 (2), pp. 192-196 : 192-195

Kibakoganea canhcamsung Do , new species

( Figs. 1–15 )

Material examined. Holotype: male, Bung River, Nam Giang district, Quang Nam Province, Vietnam, March 2012. Allotype female, same data as holotype. The type specimens are deposited in the Vietnam National Museum of Nature, Hanoi, Vietnam.

Etymology. The species name is dedicated name of horned ruteline beetles in Vietnamese.

Diagnosis of male. Body somewhat elongate, stout, convex, narrow dorsoventrally ( Figs. 12–15 ). Head and body dorsally greenish yellow ( Figs. 12, 15 ).

Holotype description. Head broad, nearly square; labrum narrow at anterior-posterior side, slightly produced beyond clypeus, broader than clypeal apex. Clypeus approximately 4 times broader than length. Front convex with 2 dark brown medial spots on each side. Eye canthus prominent, developed into square corner apicolaterally. Eyes large. Antenna with 10 antennomeres; antennomere 1 with length approximately equal to total length of antennomeres 2–7 combined. Anternomere 2 elongate; antenrnomeres 3, 4, 5 approximately as long as wide; anternomeres 6, 7 transverse. Antennal club trimerous, distinctly shorter than antennal shaft. Mandibles develop into sharp horn with a furrow along dorsal side; in dorsal view, enlarged at base and gradually narrower at medial point; inner edge strongly curved with acute apex. Terminal maxillary palpomere elongate, the longest as long as palpomere 2. Palpomere 3 stout, narrow at base; length about half that of apical palpomere. Palpomere 2 narrow at base and enlarge at apex, slightly curved medially. Palpomere 1 shortest, slightly shorter than palpomere 3 ( Figs. 1 , 12–13 ).

Pronotum convex, widest just basal to medial point. Each side of basalolateral point develops into small lobe, then slightly narrower and gradually enlarges, reaching the widest point medially. Two sides of lateral margin narrower apically after medial point. Anterior and posterior margin of pronotum convex and round. Length of pronotum nearly equal to apical width. Surface sparsely punctate. Ventrally, posterior angle of prosternum develops into a cylindrical lobe medially. The lobe covered by dense, short setae at approximately the two middle coxae. ( Figs. 2, 7 , 12–14 ).

Scutellum oval about 2 times as wide as the length, somewhat punctate. ( Fig. 12 )

Elytron greenish yellow, with a pair of dark spots; convex, basal 2/3 nearly parallel, narrowed apically; entire surface covered with short, erect setae. Each elytron with pair of dark spots; 2 apicolateral spots and 2 posterior spots. In dorsal view, elytron does not entirely cover tergites 5 and 6. ( Figs. 12, 14 ).

Protibia tridentate, apical and medial teeth equal in size; basal tooth smaller, distance between basal and medial teeth slightly longer than the distance between apical and medial teeth. Inner edge of protarsomere 5 has a medial lobe; both claws simple. ( Fig. 3 ).

Mesofemur with longitudinal brush-like setae on posterior surface. Apex of mesotibiae and metatibiae have about 10 teeth, 3 of them distinctly larger in dorsal view. Mesotarsus and metatarsus with inner claw split at apical third, and with basal lobe. Mesotarsomere 5 with 3 spines on ventral side, lateral spines longer than medial spine. Inner side of mesotarsus inner claw with medial lobe; this structure is absent in metatarsus. ( Figs. 4–6 ).

Aedeagus symmetrical, paramere quadrate, narrow mediolaterally, 2 times wider than long; apex of each paramere curves downward in lateral view, with apical tufts of setae; ventral sclerite water-drop shaped. ( Figs. 8–10 )

Female. ( Figs. 11 , 15 ) Similar to male in shape and size but difference in the following characteristics: body length of allotype 20 mm, clypeus more developed and narrow, curved upward. Mandible reduced to small lobes. Surface of clypeus and fronts (except posterior part) not smooth. Basal lateral lobe of pronotum not developed as the male and without cylindrical lobe at ventral side. Elytron is similar to the male with 2 additional brownish red spots on each side, just beyond scutellum; 1/3 basalolateral margin slightly curves upward dorsally. Elytron covers approximately 1/3 of tergites 6. Legs similar to male except the inner claw of protarsus bifid, not simple.

Measurements (mm). Holotype length: male 20.05; Allotype female: 20; male and female width 11. Discussion. Kibakoganea canhcamsung is the 14th known species of the genus. Base on the structure of male genitalia, the genus can be separated into three main groups:

Parameres short; apex separated, v-shaped. There are four species in this group: K. formosana (Kurosawa & Kobayashi) , K. kraatzi Miyake & Muramoto , K. opaca Muramoto , and K. sinica Bouchard ( Figs. 16–17 ). Parameres long, apex not separated, asymmetrical. There are three species in this group: K. kawaii Muramoto, K. koyamai (Hirasawa) , and K. kumei (Hirasawa) . ( Figs. 18–19 ).

Parameres not separated apically, symmetrical. There are seven members of the group: K. dohertyi (Ohaus) , K. fujiokai Miyake & Muramoto , K. sexmaculata (Kraatz) , K. tamdaoensis Miyake & Muramoto , K. vernicata (Benderitter) , K. canhcamsung new species, and K. yoshitomii Nagai ( Figs. 8–10 , 20–21 ).

Among members of the last group, K. fujiokai can clearly be differentiated from all the other species by the bottleshaped sclerite ventral view. Kibakoganea yoshitomii can be differentiated by the shape of the parameres that are narrow at the lateral apex. Two species, K. doherty and K. vernicata , are similar in that they have elongate and narrow pairs of paramares ( Fig. 20 ). Of the three remaining species, K. tamdaoensis is distinguished by the anchor-shaped sclerite in ventral view and the inner claw of the mesotarsus ( Fig. 6 ) without basal medial lobe as determined by Miyake & Muramoto (1992).

Two species, K. canhcamsung and K. sexmaculata , are similar in the same shape of the male genitalic sclerite and the inner claw of mesotarsus but are differentiated from each other using follow characteristics of male:

Shape of the pronotum of K. sexmaculata ( Fig. 22 ) rounder than it of K. canhcamsung ( Figs. 2 , 12 ) Cylindrical lobe occurs on ventral side of male pronotum of K. canhcamsung but is not found in K. sexmaculata ( Fig. 7 , 14 )

The parameres of K. canhcamsung ( Figs. 8, 9 ) are narrow at mediolateral point but it nearly straight in K. sexmaculata ( Fig. 21 )

Figures

FIGURES 1 – 11. Kibakoganea canhcamsung male holotype. (1) Head, dorsal view; (2) pronotum, (3) Right proleg, dorsal view; (4) Mesofemur in ventral view; (5) Apical mesotibia and mesotarsomeres in inner side view; (6) Outer claw of mesotarsus; (7) Cylindrical lobe of posterior angle of prosternum, lateral view; (8) male genital organ in dorsal view, (9) ventral view, (10) lateral view; (11) Female claws of proleg in inner side view.

FIGURES 12 – 15. Kibakoganea canhcamsung, (12) male holotype, dorsal view; (13) male holotype, ventral view; (14) male holotype, lateral view; (15) female allotype, dorsal view.

FIGURES 16 – 22. Male genital organ in dorsal view of (16) Kibakoganea formosana from Taiwan; (17) Kibakoganea kraatzi veichenbachi from Hainan, China; (18) Kibakoganea Ŀ umei from Malaysia; (19) Kibakoganea koyamai koyamai from Thailand; (20) Kibakoganea dohertyi from Thailand; and Kibakoganea sexmaculata from Mau Son, Vietnam; (21) Kibakoganea sexmaculata male genital organ in dorsal view; (22) Kibakoganea sexmaculata pronotum in dorsal view.