Peltonotus karubei Muramoto

Jameson, Mary Liz & Wada, Kaoru, 2004, Revision of the genus Peltonotus Burmeister (Coleoptera: Scarabaeidae: Dynastinae) from Southeastern Asia, Zootaxa 502 (1), pp. 1-66 : 23-25

Peltonotus karubei Muramoto

( Figs. 14 , 42a–c , 65 )

Peltonotus karubei Muramoto 2000: 9–11 . Holotype in collection of Muramoto from South Vietnam, Lam Dong Prov., Dambri Waterfall near Bao Lok. Muramoto (2000) stated that the description was based on the holotype and six male paratypes (five deposited in the collection of Muramoto, one deposited in WADA).

Description (2 males). Length 13.5–14.5 mm. Widest width 6.8 mm (based on 1 specimen and Muramoto 2000). Color: Male: Head, pronotum, scutellum, propygidium, pygidium, and venter shining, black; elytra reddish­orange with iridescent bloom; elytral suture, base, and lateral margins black. Head ( Fig. 14 ): Surface of frons with base sparsely punctate, middle of frons to apex densely punctate; punctures ocellate, multisetigerous; short setae on disc (1–5 per puncture), moderately long setae (0–1 per puncture) laterally. Surface of clypeus densely punctate; punctures ocellate, multisetigerous; short setae on disc (1–5 per puncture), moderately long setae (0–1 per puncture) laterally. Clypeus laterally weakly constricted toward apex, apex truncate, corners square, beaded; bead weakly arcuate posteriorly. Labrum deeply, narrowly emarginate at middle ( Fig. 14 ). Mandibles rounded laterally, inner apex with 2 weak teeth. Mentum with apical half rounded, weakly notched at middle; palpomere 2 dorsoventrally flattened, twice width of palpomere 1, setose; setae dense, moderately long, rufous, not curled at apex, not flattened. Maxilla: mala with weak lamellate setal brush; stipes with setae dense, long, not flattened, not curled at apex; palpomere 2 lacking internomedial bump. Antennal club subequal to segments 2–7. Pronotum: Bead lacking anterior to scutellum. Surface moderately densely punctate, punctures simple. Lateral margin lacking long setae. Elytral sutural length: About 5.0 times length of scutellum. Elytron: Surface with 5 poorly developed, punctate, longitudinal striae between suture and humerus; punctures moderate in size, moderately dense. Intervals with similar sculpturing. Propygidium: Surface densely punctate (disc) and confluently punctate (sides); punctures simple and ocellate, not setigerous. Pygidium: Surface coriaceous and punctate; punctures moderately dense, ocellate and simple, not setigerous. Venter: Prosternal keel triangular; apex produced to middle of protrochanter, rounded. Legs: Foretibia of male bidentate; lateral margin lacking short, dense setae. Foretarsomere 5 of male subequal in length to tarsomeres 1–4; foretarsomere 3–4 with apices expanded, dorsal and ventral apices clothed with dense, short setae. Foreclaws of male with inner claw curved, about 4 times thicker than outer claw; outer claw simply arcuate, about 1/2 the length of inner claw; empodium bulbous at base. Meso­ and metatibial claws of male with 2 setae. Metatibia of male apical spurs weakly curved spurs; ventral spur produced to middle of metatarsomere 1, dorsal spur produced to base of metatarsomere 2. Parameres: Fig. 42a–c .

Diagnosis. Only two species of Peltonotus are known from Vietnam: P. karubei and P. nasutus . These species are easily separated based on elytral coloration (reddish­orange with iridescent bloom in P. karubei ; black to castaneous with dorsum shining in P. nasutus ), form of the mentum (apical half rounded in P. karubei ; apical half quadrate in P. nasutus ), form of the mandible in males (rounded laterally in P. karubei [ Fig. 14 ]; quadrate laterally in P. nasutus [ Fig. 17 ]), form of the labrum (deeply, narrowly emarginate in P. karubei [ Fig. 14 ]; bilobed in P. nasutus [ Fig. 17 ]), and form of the male genitalia ( Fig. 42a–c versus Fig. 45a–c ). Peltonotus karubei is separated from other species of Peltonotus based on the following characters: labrum deeply, narrowly emarginate at middle apex ( Fig. 14 ); maxilla with palpomere 2 enlarged and with lamellate brush on mala; form of the male genitalia ( Fig. 42a–c ); male foretibia bidentate; and setae on the head sparse.

Distribution ( Fig. 65 ). Southern Vietnam.

Locality records (2 specimens) from WADA .

VIETNAM (2): Lam Dong (Dambri near Baolok, Dambri Waterfall near Bao Lok).

Temporal Data. May (2).

Remarks. This species is known only from the type series (holotype and six male paratypes) and an additional specimen we report here from near the type locality. Females are not known.

In the description, Muramoto (2000) compared P. karubei with P. pruinosus , and she stated that P. pruinosus differed based on the pygidium (shining black in P. pruinosus ; opaque black in P. karubei ) and elytral coloration (black in P. pruinosus ; reddish in P. karubei ). Based on rarity of specimens in collections, it is unlikely that comparisons were truly based on P. pruinosus . In this research, we found that P. pruinosus is known only from a single, female type specimen.

Figures

FIGURE 65. Distribution of Peltonotus species in Southeast Asia and Sundaland.

FIGURES 14–18. Head (dorsal view) showing characters of the labrum, mandible, and clypeus. 14) P.karubei (apex of labrum deeply, narrowly emarginated; apex of mandible rounded laterally), 15) P. malayensis (apex of labrum broadly emarginate; apex of mandible rounded laterally), 16) P. morio (apex of labrum bilobed; apex of mandible quadrate laterally with broadly truncate apex; apex of clypeus without tubercle in male), 17) P. nasutus (apex of labrum bilobed; apex of mandible quadrate laterally with broadly truncate apex; apex of clypeus with weak tubercle in male), 18) P. vittatus (apex of labrum broadly emarginate; apex of mandible obliquely quadrate laterally).

FIGURES 40–42. Male genitalia in dorsal (parameres only [a]) and lateral views (parameres and phallobase [b–c]) of: 40) P.fujiokai, 41) P. gracilipodus and P. podocrassus, 42) P.karubei.

FIGURES 43–45. Male genitalia in dorsal (parameres only [a]) and lateral views (parameres and phallobase [b–c]) of: 43) P. malayensis, 44) P.morio, 45) P. nasutus.