Dipelicus fastigatoides, Prokofiev, 2012

Prokofiev, Artem M., 2012, A New Species of Dipelicus Hope from Wetar Island, Indonesia (Coleoptera: Scarabaeidae: Dynastinae), Species Diversity 17 (2), pp. 173-175 : 173-175

Dipelicus fastigatoides sp. n.

( Figs 1–3 )

Type material. Holotype, male labeled “Telaga Tilu, Wetar I., VII-2007, A. Hasan leg.” (hand-written) and “ Holotype D. fastigatoides Prok. det.” (red label; hand-written).

Allotype, female with same data as holotype and with green hand-written label “ Allotype D. fastigatoides Prok. det.”

Paratypes (3 males, 4 females) with same data as holotype and with green hand-written labels “ Paratype D. fastigatoides Prok. det.”

The holotype and allotype will be sent to the Museum Zoologi Frater Vianney (Malang, Indonesia), and the other paratypes are housed in the Institute of Ecology and Evolution, Russian Academy of Sciences , Moscow, Russia (IEE) .

Differential diagnosis. The new species is similar to D. fastigatus (known range Java through Sulawesi), but the males of these two species can be separated by the structure of the male parameres (see Figs 3–4 ) and the arrangement of the stridulatory ridges (a row of 15–17 similarly sharpened ridges in D. fastigatoides versus 15 sharp ridges mixed with 10 somewhat stronger ridges in D. fastigatus ). The basal piece of the parameres is stouter and more strongly curved in lateral view in the new species than in D. fastigatus , and the apical pieces of the parameres are much deeper and more ovoid on the sides than in D. fastigatus . Also, the apical pieces of the parameres possess a well-developed, platelike extension along their internal margin in the new species, but this extension is not developed in D. fastigatus . The females of these species can be distinguished by the arrangement of the stridulatory ridges as described above.

Holotype ( Fig. 1 ). Male. Length 25.0 mm, width across humeri 11.0 mm, length of elytra 15.0 mm. Color dark reddish-brown, head and sides of pronotum black, tarsi and apices of femora, humeri, and base of elytra more infuscate; teeth of protibiae black; dorsal surface dull; venter and legs with rusty-golden setae. Clypeus finely and sparsely punctate, anterior margin bidentate. Frontal horn long, inclined posteriorly at base, then straight, triangular in cross section. Apex of mandible deeply incised. Labial palpi with last segment enlarged, globular. Pronotum 1.25 times broader than long; pronotal cavity long, flat, sloping anteriorly; pronotum at posterior midline with moderately large, laterally compressed horn inclined anteriorly; a smaller horn behind anterior angle on each side. Pronotal cavity nearly smooth; sides strongly rugopunctate. Scutellum triangular, broad- er than long, obtusely pointed apically, sparsely punctate. Elytra 1.25 times longer than broad, slightly widened toward apex, finely and sparsely punctate, apex (between apical umbones and margin of elytra) roughly rugopunctate, with ocellate punctures; traces of slightly furrowed, punctate rows present. Propygidium with 16 sharp stridulatory ridges of unequal length, posterior margin broadly round- ed, weakly produced posteriorly. Pygidium weakly convex, coarsely transversely wrinkled on sides, finely transversely wrinkled medially, apex nearly smooth. Each abdominal sternite nearly impunctate, with transverse row of setigerous punctures along middle. Protibiae tridentate, each tooth large, blunt. Metatibiae broadened towards apex; apical margin with 28 short bristles. Parameres as in Fig. 3 .

Allotype ( Fig. 2 ). Female. Length 24.0 mm, width across humeri 11.5 mm, length of elytra 15.0 mm. Other features as in holotype except as follows. Clypeus weakly emarginate. Frontal horn slightly wider than long, triangular, broadly rounded at apex. Pronotum 1.3 times longer than broad as long, strongly but simply convex, with large, shallow punctures and coarse, indistinct, transverse wrinkles, especially on sides; middle of each side of pronotum with small, shallow, round impression. Elytra 1.1 times longer than broad. Apical margin of metatibiae with 24 bristles, bristles slightly longer than those of holotype.

Variation. Males: Length 22.0–25.0mm, width across humeri 10.0–11.0 mm, length of elytra 13.0–15.0 mm. Other features as in holotype except as follows. Color reddishbrown to dark brown, head and pronotum black. Frontal horn nearly straight in smaller specimens. Pronotum 1.2 times broader than long. Elytra 1.2–1.3 times longer than broad. Apical margin of metatibiae with 20–25 short bristles. Parameres constant in shape.

Females: Length 20.0–23.0 mm, width across humeri 9.0– 11.0 mm, length of elytra 12.0–14.0 mm. Other features as in allotype except as follows. Head and pronotum dark reddish brown to black. Clypeus weakly emarginate to weakly bidentate. Frontal horn broadly rounded at apex, triangular to semicircular in shape. Pronotum 1.3–1.4 times broader than long. Lateral impression on pronotum at or slightly behind middle. Elytra 1.2–1.3 times longer than broad. Apical margin of metatibiae with 19–22 bristles, bristles slightly longer than in males. Stridulatory area with 15–17 sharp ridges, these unequal in length.

Etymology. The specific name is based on the similarity with D. fastigatus (“fastigatoides”, meaning “near fastigatus”).

Comparative material examined. D. fastigatus , 4 males, 2 females, Mt. Agropuro, East Java, April 2001 (IEE) .

Figures

Figs. 1–2. Dipelicus fastigatoides sp. n.: (1) male holotype and (2) female allotype. Scale bar=5mm.

Figs. 3–4. Male parameres (lateral and caudal views) of (3) D.fastigatoides holotype and (4) D. fastigatus. Scale bar=5mm.