Onthophagus seseba Krikken & Huijbregts

Krikken, J. & Huijbregts, J., 2017, Sulawesi Onthophagus: seven new species in select groups (Coleoptera: Scarabaeidae: Scarabaeinae), Zootaxa 4238 (3), pp. 301-334 : 329-330

publication ID

https://doi.org/ 10.11646/zootaxa.4238.3.1

publication LSID

lsid:zoobank.org:pub:D123950C-DF2B-45EE-9966-813339A83491

DOI

https://doi.org/10.5281/zenodo.6030203

persistent identifier

https://treatment.plazi.org/id/03E5BB4D-E838-FFCF-AAE4-FA59FEC9FC37

treatment provided by

Plazi

scientific name

Onthophagus seseba Krikken & Huijbregts
status

sp. nov.

Onthophagus seseba Krikken & Huijbregts View in CoL , new species

( Figs. 12 View FIGURES 9 – 12 , 30 View FIGURES 25 – 30 , 68–73 View FIGURES 68 – 81 )

Material examined. Holotype male ( RMNH) from Indonesia: Central Sulawesi: Banggai District: Batui: Seseba Estate , 80 m, 6–9.xi.1989, J. Krikken & K. van der Blom sw30a; multistratal evergreen forest, human excrement traps.

The 15 paratypes are summarized below:

CENTRAL SULAWESI: BANGGAI DISTRICT

- Batui: Seseba Estate, 80 m, 6–9.xi.1989, Krikken & Van der Blom, sw30a, multistratal evergreen forest, 4 human excrement traps, 16 in RMNH

Description. Holotype, male. Body length approximately 3.8 mm. Largely black, with orange elytral markings, dorsal side matt. Pilosity abundant, pale yellow, dorsal side with inconspicuous short (white) setae.

Clypeal border round-truncate, clypeogenal transition continuous; clypeofrontal transition with fine arcuate ridge just reaching clypeogenal sutures on either side; head densely punctate throughout, punctures distinct, with pale microstubble. Eyes with approximately 6 facet rows across widest point; ratio interocular distance / single maximum eye width approximately 10.

Pronotum evenly moderately convex, discal midline not impressed; anterior section of lateral border widely round, posterior section slightly sinuate to obtuse posterolateral angle; pronotal base indistinctly, finely marginate. Pronotum with disc densely, superficially but densely annulate-punctate, punctures with short seta (length mainly twice punctural diameter); punctures on lateral declivities smaller, deeper, more irregular.

Elytra bicoloured; striae well defined, shallow, with distinct punctures; mostly separated by 2–4 times their diameter, distinctly crenulate on interstriae; discal interstriae flat, with irregular rows of seta-bearing microgranulae (setae fine, short), derm generally microreticulate; surface of lateral interstriae more uneven, almost rugulatepunctate, more shiny.

Antennal club yellowish brown. Metaventrite shiny brown, without distinct midline impression, anterior lobe with slight median ridge in front; most of discal surface with abundant fine punctation; lateral wings with coarser, more-or-less annulate punctation, with longer setae. Abdominal ventrites with transverse row of (more-or-less annulate) punctures, setae appressed caudad. Pygidium evenly convex, abundantly punctate-setose; base with transverse ridge.

Protibia with 3+(1) larger external denticles; spur curved-acuminate. Metatibial spur long, tapering. Femoral undersides all with (more-or-less scattered) seta-bearing punctures. Metatarsomere 1 shorter than 2–5 combined; approximate proportions of spur and metatarsomeres 1–5: 11// 13/6/4 /3/5.

Aedeagus, Fig. 72 View FIGURES 68 – 81 (holotype).

Measurements in mm. Maximum width of head 1.1. Median length of pronotum 1.2, maximum width 1.9. Sutural length of elytra 1.6, maximum width 2.1.

Variation and sexual dimorphism. Body length 3–4.5 mm. Microsculpture, pilosity, and colour slightly variable.

Females with distinct, low clypeofrontal ridge, sexual dimorphism otherwise insignificant.

Etymology. Named for the type locality in eastern Central Sulawesi. This name should be treated as a noun in apposition.

RMNH

National Museum of Natural History, Naturalis

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Scarabaeidae

Genus

Onthophagus

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