Frolov, A. V. 2014. New species of the Madagascan scarab beetle genus Madecorphnus Paulian, 1992 (Coleoptera: Scarabaeidae: Orphninae). Proceedings of the Zoological Institute RAS, 318(1): 34-39.

ZooBank: urn:lsid:zoobank.org:pub:86CC51C2-9559-4AA4-9496-C66B932F33DF

New species of the Madagascan scarab beetle genus Madecorphnus Paulian, 1992 (Coleoptera: Scarabaeidae: Orphninae)

A.V. Frolov

Laboratory of Insect Systematics, Zoological Institute, Russian Academy of Sciences, Universitetskaya nab., 1, 199034 Sankt-Petersburg, Russia. Email: aphodius@rambler.ru

Abstract

Three new species of the scarab beetle genus Madecorphnus, endemic to Madagascar, are described from the material collected by the staff of the California Academy of Sciences. The new species are: M. fisheri sp. nov. (mid-elevation rain forest on the eastern flank of the Anosyenne Mountains, southern Madagascar), M. saintemariensis sp. nov. (coastal forest, Sainte Marie Island, eastern Madagascar), and M. tuberculatus sp. nov. (low elevation rain forest, Betampona Reserve, eastern Madagascar).

Key words: scarab beetles, orphnines, new species, Madagascar

 

НОВЫЕ ВИДЫ ПЛАСТИНЧАТОУСЫХ ЖУКОВ МАДАГАСКАРСКОГО РОДА MADECORPHNUS PAULIAN, 1992 (COLEOPTERA: SCARABAEIDAE: ORPHNINAE)

А.В. Фролов

Зоологический институт Российской академии наук, Университетская наб. 1, 199034 Санкт-Петербург, Россия; e-mail: afrolov@zin.ru 

РЕЗЮМЕ

По материалам, собранным сотрудниками Калифорнийской академии наук описаны три новых вида пластинчатоусых жуков эндемичного Мадагаскарского рода Madecorphnus: M. fisheri sp. n. (среднегорный дождевой лес на восточных склонах гор Аносьен, южный Мадагаскар), M. saintemariensis sp. n. (прибрежный лес, остров Сен-Мари, восточный Мадагаскар), and M. tuberculatus sp. n. (низинный дождевой лес, заповедник Бетампона, восточный Мадагаскар).

Ключевые слова: пластинчатоусые жуки, орфнины, Мадагаскар

Submitted November 9, 2013; Accepted February 5, 2014.

 

INTRODUCTION

Madecorphnus Paulian, 1992 is currently the largest genus of the Madagascan Orphninae comprising 16 described species (Frolov, 2010, 2012). In the present paper three new species of this genus are described based on the material collected by Brian Fisher and his team (California Academy of Sciences, San-Francisco, U.S.A. — CAS). The new species include the first Orphnine species from Sainte Marie Island, eastern coast of Madagascar, and a species from the Andohahela National Park which is the southernmost recorded Madecorphnus locality to date.

MATERIAL AND METHODS

Preparation of genitalia follows the common technique used in entomological research. Photographs of the habitus and parameres were taken with a Leica MZ9.5 stereo microscope from dry specimens. Partially focused serial images were combined in Helicon Focus software to produce completely focused images. Photographs of the internal sac armatures were taken with the same microscope from specimens in glycerol. Photographs were not altered except for digital enhancing with Adobe Photoshop (levels and tone correction, background elimination, sharpening). To analyze the distribution of the species, maps were generated with ArcGIS software. As the base map, a Madagascar vegetation map (CEPF Madagascar Vegetation Mapping Project of Royal Botanic Gardens, Kew, Missouri Botanical Garden, and Conservation International’s Center for Applied Biodiversity Science; http://www.vegmad.org) was used.

SYSTEMATICS

Family Scarabaeidae Latreille, 1802

Subfamily Orphninae Erichson, 1847

Genus Madecorphnus Paulian, 1992

Madecorphnus fisheri sp. n.

(Figs 1–4)

Holotype. Male with the labels "MADAGASCAR: Toliara Prov., Parc National d'Andohahela, Col du Sedro, 3.8 km 113° ESE Mahamavo, 37.6 km NNW Tolagnaro, 21-25 I 2002", "24°45'50''S 46°45'6''E coll. Fisher, Griswold et al. California Acad. of Sciences, sifted litter, mountain rainforest, elev 900 m code: BLF5010", "CASENT 5504179" (CAS).

Etymology. The new species is named after Brian Fisher, ant team leader at the California Academy of Sciences.

Differential diagnosis. M. fisheri sp. n differs from other species of the genus in having internal sac of aedeagus with very long sclerites but without fields of small spinules (Fig 3), and in long, relatively wide parameres with somewhat triangular apices (in lateral view,

Fig 2).

Description. Holotype, male (Figs 1, 2, 3). Body length 5.8 mm. Color uniformly blackish brown.

Right mandible slightly longer than left, without tooth behind apex. Labrum trapezoidal, with broadly rounded sides, length about 1/6 width (in dorsal view). Clypeus very slightly asymmetrical, apically obtuse, with 2 long and 2 shorter setae on the apical margin. Genae very small, not protruding beyond eyes. Canthus and frontal suture absent. Clypeus slightly depressed apicomedially. Head without traces of frontoclypeal suture, finely punctate with minute punctures separated by greater than 4 times their diameter.

Pronotum approximately 1.7 times wider than long, widest medially. Disc of pronotum convex, without any depressions, tubercles, or ridges. Punctation on pronotum finer than on head, almost indistinct. Margins with relatively wide border, lateral margins with 4 long setae: 1 seta on basal angle, 1 seta approximately in the middle of lateral margin, and 2 setae on the apical angle. Base with a row of relatively large longitudinally elongated punctures.

Scutellum triangular, right angled apically, about 1/11 length of elytra.

Elytra convex, with distinct humeral calli, widest at basal third, glabrous. First stria distinct and reaching the apex of elytron, other striae indistinct. Disc of elytra sparsely punctate with minute punctures. Epipleura with long, sparse, brown setae. Base of elytron with border from scutellum to humeral callus. Wings fully developed.

Parameres relatively large, about 1.5 time shorter than phallobase, with almost indistinct lateral teeth, somewhat triangular in lateral view (Fig. 2). Internal sac with 2 very long sclerites and 2 smaller somewhat tooth-shaped sclerites (Fig. 3), without fields of small spinules.

Female unknown.

Figs 1–4. Madecorphnus fisheri sp. n., holotype, male.
Figs 1–4. Madecorphnus fisheri sp. n., holotype, male. 1 – habitus, 2 – parameres in dorsal and lateral view, 3 – internal sac of aedeagus, 5 – collecting locality map.

Distribution and habitat

The type specimen of M. fisheri sp. n. was collected in Parcel 1 of the Parc National d'Andohahela (Fig. 4). This is the southernmost recorded locality of Madecorphnus. This locality lies within mid-elevation rain forest biome on the eastern flank of the Anosyenne Mountains, the southernmost rain forest in Madagascar and one of the few rain forests areas south of the tropic of Capricorn (Goodman, 1999).

Madecorphnus saintemariensis sp. n.

(Figs 5–8)

Holotype. Male with the labels "MADAGASCAR: Toamasina Prov., Ile Sainte Marie, Foret Ambohidena, 22.8 km 44°NW Ambodifotatra, el 20m 21 November 2005” and “16°49'28"S 049°57'51"E California Acad. of Sciences coll. Brian L. Fisher et al. sifted litter, littoral rainforest coll. code: BLF12840” (CAS). Female with the same data as the holotype (CAS).

Etymology. The name of the new species is derived from the name of Sainte Marie island.

Differential diagnosis. M. saintemariensis sp. n. differs from other species of the genus in having internal sac of aedeagus with 2 tooth-shaped sclerites, 1 longer sclerite and a few fields of minute spinules one of which forms a finger-shaped process of the sac (Fig. 7), and in parameres with large lateral teeth (Fig. 6).

Description. Holotype, male (Figs 5–7). Body length 6.9 mm. Color uniformly dark brown, pronotum and disc of head almost black, legs somewhat paler.

Right mandible almost 1.5 times longer than left, without tooth behind apex. Labrum trapezoidal, with broadly rounded sides, length about 1/6 width (in dorsal view). Clypeus asymmetrical, apically obtuse, with 4 setae on the apical margin 3 of which are displaced to the left side. Genae very small, not protruding beyond eyes. Canthus and frontal suture absent. Clypeus depressed apicomedially. Head without traces of frontoclypeal suture, finely punctate with minute punctures separated by 5–10 times their diameter.

Pronotum approximately 1.6 times wider than long, widest medially. Disc of pronotum convex, without any depressions, tubercles, or ridges. Punctation on pronotum is similar to that on head. Margins with relatively wide border, lateral margins with 4 long setae: 1 seta on basal angle, 1 seta approximately in the middle of lateral margin, and 2 setae on the apical angle. Base with a row of longitudinally elongated punctures, smaller and sparser than in M. fisheri.

Scutellum triangular, right angled apically, about 1/11 length of elytra.

Elytra convex, with distinct humeral calli, widest at basal third, glabrous. First stria distinct and reaching the apex of elytron, other striae indistinct. Disc of elytra with double punctation consisting of large sparse punctures and minute ones. Epipleura with long, sparse, brown setae. Base of elytron with border from scutellum to humeral callus. Wings fully developed.

Parameres relatively large, about 1.4 time shorter than phallobase, wide, with large lateral teeth (Fig. 6). Internal sac of aedeagus with 2 tooth-shaped sclerites, 1 longer sclerite and a few fields of minute spinules one of which forms a finger-shaped process of the sac (Fig. 7).

Female. Differs from male in having mandibles of subequal length, and apical spur of anterior tibia.

Figs 5–8. Madecorphnus saintemariensis sp. n, holotype, male.
Figs 5–8. Madecorphnus saintemariensis sp. n, holotype, male. 5 – habitus, 6 – parameres in dorsal and lateral view, 7 – internal sac of aedeagus, 8 – collecting locality map.

 

Distribution and habitat. M. saintemariensis sp. n. is the first orphnine species found on Sainte Marie Island (Nosy Boraha), a small island 6 km off the eastern coast of Madagascar (Fig. 8). Primary vegetation of the island, consisting of low altitude rainforest and coastal forest, is largely disturbed (Du Puy & Moat, 1996). M. saintemariensis sp. n. is one of the few orphnine species inhabiting coastal forests in Madagascar.

Madecorphnus tuberculatus sp. n.

(Figs 9–13)

Holotype. Male with the labels "MADAGASCAR: Toamasina Prov., Reserve Betampona Camp Vohitsivalana, 37.1 km 338° Toamasina elev 520 m 1-3 Dec 2005 ” and “17° 53' 12" S 049° 12' 09" E California Acad. of Sciences coll. Brian L. Fisher et al. sifted litter rainforest collection code: BLF13242” (CAS).

Differential diagnosis. This new species is similar to M. montreuili Frolov, 2010, and M. barclayi Frolov, 2012, in having 2 tubercles on mentum and bidentate apex of right mandible. It is most similar to the latter species in having internal sac of aedeagus with two sclerites but the shape of the sclerites is different: they are much larger and heavily sclerotized (Fig. 11). Madecorphnus tuberculatus sp. n. also differs from M. barclayi in having a relatively wider body with relatively larges eyes (Fig. 12).

Description. Holotype, male (Figs 9–12). Body length 5.8 mm. Color uniformly dark brown, legs somewhat paler. Right mandible about 1.5 times longer than left, strongly curved, with a tooth behind apex. Labrum trapezoidal, with rounded anterior angles, its length about 1/8 width (in dorsal view). Mentum with 2 conical tubercles. Clypeus slightly asymmetrical, almost flat anteriorly, obtuse, with a group of 4 setae displaced to the left side. Genae very small, not protruding beyond eyes. Canthus and frontal suture indistinct. Head dorsally with minute punctures separated by more than 4 puncture diameters.

Pronotum 1.7 times wider than long, widest medially. Disc of pronotum convex, without any depressions, tubercles, or ridges. Punctation on pronotum finer than on head, almost indistinct. Margins with relatively wide border, lateral margins with 4 long setae: 1 seta on basal angle, 1 seta approximately in the middle of lateral margin, and 2 setae on the apical angle. Base with a row of feebly elongated punctures, smaller and sparser than in M. fisheri.

Elytra convex, with distinct humeral and apical calli. Maximum width approximately in the middle. First stria distinct and reaching apex of elytron, other striae indistinct. Epipleura with long, sparse, brown setae. Base of elytra with border connected to first elytral interval. Elytra with double punctation: sparse large punctures on disc and minute, feebly visible punctures throughout elytron. Wings fully developed.

Parameres large, about 1.3 time shorter than phallobase, wide and rounded apically (in dorsal view), with small lateral teeth and large excavations between teeth and paramere apices (Fig. 10). Internal sac of aedeagus with 2 tooth-shaped sclerites (Fig. 11).

Distribution and habitat. Madecorphnus tuberculatus sp. n. is known from one locality in the Betampona Reserve, a patch of primary low elevation rain forest about 25 km inland of the eastern coast (Fig. 13)

Figs 9–13. Madecorphnus tuberculatus sp. n, holotype, male.
Figs 9–13. Madecorphnus tuberculatus sp. n, holotype, male. 9 – habitus, 10 – parameres in dorsal and lateral view, 11 – internal sac of aedeagus, 12 – body outline in dorsal view (left – M. tuberculatus, holotype, right – M. barclayi, holotype; not to scale), 13 – collecting locality map.

ACKNOWLEDGEMENTS

The author is thankful to Dave Kavanaugh, Jere Schweikert, Igor Sokolov, and Norm Penny for help during a visit to California Academy of Sciences. This work was supported by the Ernst Mayr Foundation and Russian Foundation for Basic Research (grant 13-04-01002-a).

REFERENCES

Du Puy D.J. and Moat J. 1996. A refined classification of the primary vegetation of Madagascar based on the underlying geology: using GIS to map its distribution and to assess its conservation status. In: W.R. Lourenco (Ed.). Biogeographie de Madagascar. ORSTOM, Paris: 205–218.

Frolov A.V. 2010. Revision of the Madagascan genus Madecorphnus Paulian (Coleoptera, Scarabaeidae, Orphninae). Journal of Natural History, 44: 1095–1111.

Frolov, A.V. 2012. Three new species of scarab beetle genus Madecorphnus Paulian, 1992 (Coleoptera: Scarabaeidae: Orphninae) from Madagascar. Proceedings of the Zoological Institute RAS, 316, 159–165.

Goodman, S.M. 1999. Description of the Réserve Naturelle Intégrale d'Andohahela, Madagascar, and the 1995 Biological Inventory of the Reserve. Fieldiana, Zoology, New Series, 94, 1-7.