Onthophagus bisscrutator Krikken & Huijbregts

Krikken, J. & Huijbregts, J., 2017, Sulawesi Onthophagus: seven new species in select groups (Coleoptera: Scarabaeidae: Scarabaeinae), Zootaxa 4238 (3), pp. 301-334 : 304-312

Onthophagus bisscrutator Krikken & Huijbregts , new species

( Figs. 1 , 13 , 31–36 )

Material examined. Holotype male ( RMNH) from Indonesia: North Sulawesi: Dumoga Bone National Park :

Toraut R3, alt. 245 m, 19–27.viii.1985, J. Huijbregts HH433; multistral evergreen forest, 4 papaya traps. The 216 paratypes are summarized below:

NORTH SULAWESI: DUMOGA BONE National Park

- Mount Mogogonipa, 400 m, 22–26.viii.1985, J. Huijbregts, hh424, multistratal evergreen forest, 2 fish traps,

29 paratypes in RMNH

- Mount Mogogonipa, 600 m, 22–26.viii.1985, J. Huijbregts, hh425, multistratal evergreen forest, 2 fish traps, 3

paratypes in RMNH

- Page Subcamp, 302 m, 3–8.ix.1985, J. Huijbregts, hh439, multistratal evergreen forest, human excrement

baited, baffled canopy funnel trap 0 m, 1 paratype in RMNH

- Poniki Trail: Station 0 29, 1600 m, x.1985, J. Van Stalle, 6 paratypes in IRSNB - Toraut R 3, 245 m, 31.v–8-vi.1985, J. Huijbregts, hh357, multistratal evergreen forest, 4 fungi traps, 36 paratypes in RMNH

- Toraut R 3, 245 m, 8–10.v.1985, J. Huijbregts, hh311, multistratal evergreen forest, 4 human excrement traps, 5 paratype in RMNH

- Toraut R 3, 245 m, 10–18.v.1985, J, Huijbregts, hh320, multistratal evergreen forest, human excrement canopy trap 0 m, 3 paratypes in RMNH

- Toraut R 3, 245 m, 20.v.1985, J. Huijbregts, hh326, multistratal evergreen forest, decaying fungi, 1 paratype in RMNH

- Toraut R 3, 245 m, 20–23.v.1985, J. Huijbregts, hh332, multistratal evergreen forest, 4 banana traps, 1 paratype in RMNH

- Toraut R 3, 245 m, 15–19.viii.1985, J. Huijbregts, hh415, multistratal evergreen forest, 4 papaya traps, 5 paratypes in RMNH

- Toraut R 3, 245 m, 16–20.viii.1985, J. Huijbregts, hh422, multistratal evergreen forest, human excrement baited, baffled canopy funnel trap 0 m, 12 paratypes in RMNH

- Toraut R 3, 245 m, 19–27.vii.1985, J. Huijbregts, hh433, multistratal evergreen forest, 4 papaya traps, 21 paratypes in RMNH

- Toraut, 234 m, 31.v–8.vi.1985, J. Huijbregts, hh356, multistratal evergreen forest, window trap, 5 paratypes in RMNH

- Toraut, 217 m, 9–11.v.1985, J. Huijbregts, hh313, multistratal evergreen forest edge, 4 human excrement traps, 2 paratypes in RMNH

- Toraut, 217 m, 11–18.v.1985, J. Huijbregts, hh321, multistratal evergreen forest edge, 4 human excrement traps, 3 paratypes in RMNH

- Toraut, 217 m, 18–22.v.1985, J. Huijbregts, hh329, multistratal evergreen forest edge, 4 human excrement traps, 6 paratypes in RMNH

- Toraut, 234 m, 15–21.viii.1985, J. Huijbregts, hh416, multistratal evergreen forest, window trap, 1 paratype in RMNH

- Toraut: Maze, 220 m, 9–15.xi.1985, J. Krikken, pw23, multistratal evergreen forest, 4 human excrement traps, 20 paratypes in RMNH

NORTH SULAWESI: MOUNT AMBANG NATURE RESERVE

- Kotamobagu (20 km E), 1200 m, 29–30.v.1985, J. Huijbregts, hh342, coffee plantation, 4 human excrement traps, 1 paratype in RMNH

- Kotamobagu (20 km E), 1120 m, 9–13.ix.1985, J. Huijbregts, hh443a, multistratal evergreen forest, 2 human excrement traps, 1 paratype in RMNH

- Kotamobagu (20 km E), 1120 m, 9–13.ix.1985, J. Huijbregts, hh443b, multistratal evergreen forest, 2 fish traps, 4 paratypes in RMNH

- Kotamobagu (20 km E), 1080 m, 9–13.ix.1985, J. Huijbregts, hh443, multistratal evergreen forest, 4 fungi traps, 14 paratypes in RMNH

- Kotamobagu (20 km E), 1200 m, 10–12.ix.1985, J. Huijbregts, hh446a, multistratal evergreen forest edge, 2 human excrement traps, 3 paratypes in RMNH

- Kotamobagu (20 km E), 1200 m, 10–12.ix.1985, J. Huijbregts, hh446b, multistratal evergreen forest edge, 2 fish traps, 5 paratypes in RMNH

NORTH SULAWESI: TANGKOKO NATURE RESERVE

- Pantai Trail, 100 m, 27–29.xi.1985, J. Krikken, pw41a, multistratal evergreen forest, 2 human excrement traps, 28 paratypes in RMNH

Description. Holotype, male. Body length approximately 7.2 mm. Generally black-brown (not metallic), forebody shiny, elytra slightly less shiny. Pilosity pale white, dorsal side with numerous distinct setae.

Clypeus anteromedially with short, erect, broad lobe; top angles slightly round; clypeogenal transition virtually continuous; genal border widely round; clypeofrontal transition with median callosity; cephalic surface with abundant, partly seta-bearing, distinct punctures. Vertex indistinctly raised. Eyes dorsally very narrow, with approximately 8 facet rows across widest point; ratio interocular distance / single maximum eye width approximately 22.

Pronotum strongly convex, midline hardly depressed, impunctate; anterior declivity broad, topped by extensive, anteriorly convergent protuberance; apex very shallowly bifid (dorsal view), with declivity laterally delimited by distinct cavity on either side; anterior section of lateral border weakly sinuate, anterolateral angle approximately 80°; posterior section of lateral border slightly sinuate; base immarginate; most of pronotal derm densely, distinctly punctate-setose but discal midline as well as anterolateral cavities virtually impunctate; discal punctures separated by 1–3 punctural diameters.

Elytral striae discally well defined, with distinct punctures, mostly separated by 2–4 times their diameter; interstriae slightly crenulate, almost flat, microreticulate (x80), with poorly-defined, scattered, abundant, setabearing, finely asperate punctures; punctation on lateral interstriae coarse, more rugulate. Elytral base slightly rufous.

Antennal club grayish brown. Metasternum with shallow midline impression; disc along midline impunctate; much of disc with sparse, fine, seta-bearing punctures; lateral wings with abundant seta-bearing, subocellate punctures.

Abdominal ventrites each with (somewhat irregular) transverse row of closely set seta-bearing punctures; juxta-elytral surface rufous. Pygidium almost matt; crowded with seta-bearing, subocellate punctures (somewhat rugulate); base marginate.

Legs brown. Protibia slender, distally slightly curved inwards, apex internally slightly produced (angular), with 3+(1) larger denticles (tip of some worn off); spur short, acuminate. Mesotibiae and metatibiae and their spurs unmodified (some worn off). Profemoral, mesofemoral, and metafemoral underside sparsely, finely punctatesetose. Approximate proportions metatarsomeres 1–5: 11/4/3 /2/4 (full spur in male paratype slightly shorter than tarsomere 1: proportion approximately 9).

Aedeagus, Fig. 35 (paratype).

Measurements in mm. Maximum width of head 2.1. Median length of pronotum (apart from protrusion) 2.3, maximum width 3.8. Sutural length of elytra 2.6, maximum width 4.0.

Variation and sexual dimorphism. Body length 5.0– 7.5 mm. Clypeal apex and pronotal gibbosity variably developed. Minor males may lack anteromedian clypeal lobe, looking like females.

Female lacking anteromedian clypeal lobe. Clypeus rugulate-punctate. Clypeofrontal ridge present, weaklypronounced, curvilinear. Vertex with low, transverse costa. Pronotum more-or-less swollen anteromedially, otherwise unmodified. Legs different, protibia more robust, not curved, apex not produced; spur elongateacuminate.

Etymology. The “bis-“ prefix has been added to the name of the related species, scrutator , meaning a second time.

Figures

FIGURES 1 – 8. Sulawesi Onthophagus species, oblique habitus. 1, O. bisscrutator, holotype male from Toraut. 2, O. scrutator, male from Moramo. 3, O. bongkudai, holotype male from Moajat. 4, O. sangirensis, male from Toraut. 5, O. holosericus, male from Marena, 6, female from Marena. 7, O. sopu, holotype male from Sopu. 8, O. manguliensis, male from Mangoli. Scale lines approximately 1 mm.

FIGURES 13 – 18. Sulawesi Onthophagus species, dorsal forebody. 13, O. bisscrutator, holotype male from Toraut. 14, O. scrutator, male from Moramo. 15, O. bongkudai, holotype male from Moajat 16, paratype female. 17, O. sangirensis, male from Toraut. 18, O. sangirensis, female from Tangkoko. Scale lines approximately 1 mm.

FIGURES 31 – 38. Sulawesi Onthophagus, body parts. 31 –, O. bisscrutator, head full-face, holotype male from Toraut. 32, O. bisscrutator, left elytron dorsal, holotype male from Toraut. 33, O. bisscrutator, protibial upper side, holotype male from Toraut. 34, O. bisscrutator, metatibial underside, paratype male from Mogogonipa. 35, O. bisscrutator, aedeagus lateral, paratype male from Toraut. 36, O. bisscrutator, head full-face, paratype female from Toraut. 37, O. scrutator, head full-face, female from Matanyo. 38, O. scrutator, aedeagus lateral, male from Morano. Scale lines approximately 1 mm.