On the Phytophagous Scarabs of the Subfamilies Dynastinae, Rutelinae
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Species Diversity 21: 71–77 25 May 2016 DOI: 10.12782/sd.21.1.071 On the Phytophagous Scarabs of the Subfamilies Dynastinae, Rutelinae, and Melolonthinae from the Schouten Islands (=Kepulauan Biak), Indonesian Papua (Coleoptera: Scarabaeidae) Artem M. Prokofiev A.N. Severtsov Institute for Ecology and Evolution, Russian Academy of Sciences, Leninsky prospect 33, Moscow 119071, Russia E-mail: [email protected] (Received 30 March 2015; Accepted 10 March 2016) http://zoobank.org/8C100709-5B8B-42CB-BF9E-60B6F55F6045 Twelve species of rhinoceros beetles and chafers are reported from Biak I. and Yapen I. off the northwest coast of New Guinea; three species of Neoheteronyx are described as new. Xylotrupes clinias Schaufuss, 1885 and Engertia amboinae Brenske, 1897 are reported for the Papuan region for the first time, and the range of Lepidiota reuleauxi Brenske, 1892 is extended to the Indonesian part of New Guinea. A relationship between the scarab faunas of the Schouten and Moluccan Is. is demonstrated for the first time. Key Words: Phytophagous Scarabaeidae, Papuan region, Biak, Yapen, species composition, faunistics, Neoheteronyx, new species. bear the following labels: “HOLO-/PARATYPUS Neohet- Introduction eronyx [species epithet] Prok.” The length of the beetles was measured from the anteriormost point of the clypeus to the The scarabaeid diversity of the Papuan region is still very hindmost point of the elytra. incompletely known, and the species composition on the small islands off the main island of New Guinea remains al- Subfamily Dynastinae MacLeay, 1819 most completely unresearched. For instance, the scarabaeid Oryctes rhinoceros (Linnaeus, 1758) fauna of the islands in Geelvink (=Cenderawasih) Bay has never been the object of a special study, although there have Scarabaeus rhinoceros Linnaeus, 1758: 346. been several species descriptions of dynastine and ruteline beetles from Biak and Yapen Islands (Endrödi 1985; Zorn Material. 2 males, Indonesia, Papua, Biak I., Biak Kota, 2007). Samau village, Nirmala Hotel, 12 and 18.11.2012, A. M. Pro- In November 2012 I spent few weeks on Biak I. and had kofiev leg. a short excursion on Yapen I., whence a small collection of Remarks. This is a widely distributed species known beetles was obtained. Although this trip generally was not from the whole Oriental and Papuan regions eastward to conductive to good sampling as I visited this area during the Polynesia, and a common pest of coconut palms. However, driest part of the year and the time for entomological inves- in the present study it was a rare inhabitant of urban lands tigations was very limited, 12 species of phytophagous scar- only. abs were collected, some of which belong to new species or represent range extensions for known species. Furthermore, Oryctoderus latitarsis Boisduval, 1835 some species appeared to be close or identical not to their relatives on the neighbouring main island of New Guinea Oryctoderus latitarsis Boisduval, 1835: 160. but to species hitherto known from more westward islands of the Indo-Australian Archipelago. Therefore, I have decid- Material. 2 males, Indonesia, Papua, Biak I., Biak Utar, ed to summarize the data on this collection in the present near Napdori village, 2–3 km from right bank of Air Napdo- communication. ri river, black light, 10–11.11.2012, A. M. Prokofiev leg.; 23 The holotypes will be sent to the Museum Zoologi Frater males, 28 females, Yapen I., northern coast, Rosbori village, Vianney (Malang, Indonesia), and the paratypes and other black light, 13–14.11.2012, A. M. Prokofiev leg. specimens are housed in the Institute of Ecology and Evo- Remarks. This species is widely distributed throughout lution, Russian Academy of Sciences, Moscow, Russia (IEE). New Guinea and on adjacent islands westward to the Kei The type specimens of the species described in this paper and Tanimbar Is. (Endrödi 1985). All the specimens col- © 2016 The Japanese Society of Systematic Zoology 72 A. M. Prokofiev lected were associated with coconut palms. It was extremely Anomala pygidialis Kirsch, 1876 abundant in the coconut groves on the border of a disturbed primary forest. Anomala pygidialis Kirsch, 1876: 141. Xylotrupes clinias Schaufuss, 1885 Material. 4 females, Indonesia, Papua, Yapen I., north- ern coast, Rosbori village, at light, 13–14.11.2012, A. M. Xylotrupes clinias Schaufuss, 1885: 192. Prokofiev leg. Remarks. This species was originally described from Material. 3 males, 4 females, Indonesia, Papua, Biak I., “Rubi [?], in the south of Geelvinksbay” and later was re- Biak Kota, Samau village, Nirmala Hotel, 08–20.11.2012, A. described together with specimens from the Vogelkop Pen- M. Prokofiev leg.; 2 males, 3 females, Biak Utar, near Nap- insula and the adjacent islands (Misool and Waigeo) (Zorn dori village, 2–3 km from right bank of Air Napdori river, 2007). Although I did not collected any males, my female black light, 10–11 and 18–19.11.2012, A. M. Prokofiev leg. specimens are closer to A. pygidialis than to two other very Remarks. This species has been known hitherto from similar species (A. biakensis Zorn, 2007 from Biak I. and A. Sulawesi and the Moluccas eastward to the Kei Islands bruggei Zorn, 2007 from Yapen I. and the adjacent coast of (Rowland 2011). The populations from the main island of New Guinea) in displaying no any trace of a basal tooth on New Guinea and the Aru Islands were separated as X. cari- the protibia and in other minor details (see Zorn 2007: 38). nulus Rowland, 2011 (loc.cit.). Surprisingly, the specimens Anomala bruggei co-occurs with A. pygidialis in area near from Biak possess well-developed pronotal carinae, which Sorong city (northwestern coast of New Guinea) as well is not characteristic for a New Guinean species. A direct (Zorn 2007). comparison of the Schouten specimens with specimens from Ceram and Ambon Is. (X. clinias) and Fak-Fak Mts., Parastasia novoguineensis Ohaus, 1898 New Guinea (X. carinulus) shows their full identity with the former species. The presence of beetles morphologically Parastasia novoguineensis Ohaus, 1898: 22. identical to the Moluccan form on the Geelvink Bay islands indicates that the distribution of this form extends rather Material. 1 female, Indonesia, Papua, Yapen I., north- far eastward along the northwestern coast of New Guinea. ern coast, Rosbori village, at light, 13–14.11.2012, A. M. On the other hand, the differences between X. clinias and X. Prokofiev leg. carinulus may represent population variability rather than Remarks. This is an uncommon but widely distributed specific differences, inasmuch as both nominal species have Papuan species known from New Guinea and nearby islands the same structure of the raspulae (Rowland 2003, 2011), including the Solomon Islands (Prokofiev 2014). and populations with developed pronotal carinae may be sparsely distributed among populations that lack such ca- Subfamily Melolonthinae Samouelle, 1819 rinae. Arguing against this, however, Rowland (2011) con- Apogonia sp. sidered the pronotal structure to be a very stable character for X. carinulus based on his examination of more than 200 Material. 2 females, Indonesia, Papua, Yapen I., north- males from the whole assumed range of distribution. ern coast, Rosbori village, on leaves by day, 13–14.11.2012, A. M. Prokofiev leg. Subfamily Rutelinae MacLeay, 1819 Remarks. This is a dark reddish-brown, dorsally gla- Anomala anoguttata Burmeister, 1844 brous, moderately large (10 mm) species with a broadly and conspicuously concave anterior margin of the clypeus, a tri- Anomala anoguttata Burmeister, 1844: 280. dentate protibia, and the thorax and abdomen bearing very short aciculate setae in the punctures alternating with a few Material. 1 male, 3 females, Indonesia, Papua, Biak moderately long hairs on the sides of the metasternum. The I., Biak Kota, Samau village, 18–19.11.2012, A. M. Proko- poorly defined species A. papua Lansberge, 1880 can be ex- fiev leg.; 1 male, 1 female, Biak Utar, near Napdori village, cluded by indications of “elytris rugosopunctatis” and “py- 2–3 km from right bank of Air Napdori river, black light, gidio rugoso” in the original description (Lansberge 1880: 10–11.11.2012, A. M. Prokofiev leg. 119); my specimens have flat spaces between the elytral Remarks. This species is widely distributed from punctures and a rugopunctate pygidium. The Papuan repre- the Philippines to the Solomon Islands (judging from sentatives of the A. expeditionis complex (A. expeditionis s.l.) the specimens kept in the Ohaus collection, Museum für differs from my specimens in having an almost straight an- Naturkunde, Berlin; author’s unpublished data). Four of my terior margin of the clypeus, a hairy thorax, and longer setae specimens were collected in agricultural lands near a town; on the abdomen. This is apparently an undescribed species the two other specimens came to a light in a disturbed sec- but incomplete knowledge of Indo-Australian Apogonia and ondary forest. the absence of males prevent its formal description here. Phytophagous scarabs of Schouten Is., Papua 73 Figs 1–3. Scalation of the elytral interspaces in Engertia amboinae, Yapen I. (1); E. papuana, Papua New Guinea: Sentani (2), and E. setifera, Ceram I. (3). Scale bar (common)=1 mm. Engertia amboinae (Brenske, 1897) Lepidiota reuleauxi Brenske, 1892 Phila amboinae Brenske, 1897: 111. Lepidiota reuleauxi Brenske, 1892: 49. Material. 1 female, Indonesia, Papua, Yapen I., north- Material. 4 males, 4 females, Indonesia, Papua, ern coast, Rosbori village, at light, 14.11.2012, A. M. Proko- Yapen I., northern coast, Rosbori village, black light, 13– fiev leg.; 1 isolated elyton, Miosindi Islet between Biak and 14.11.2012, A. M. Prokofiev leg. Yapen Is., on sea coast, 15.11.2012, A. M. Prokofiev leg. Remarks. This species is widely distributed in Papua Remarks. Five known species of Engertia Dalla Torre, New Guinea, where it is known as a sugarcane pest (Allsopp 1912 are distributed in the Philippines, Sri Lanka, southern 1990).