Peploglyptus mulu, Caterino, Michael S., 2004

Caterino, Michael S., 2004, Description of the First Old World Peploglyptus Leconte (Coleoptera: Histeridae: Onthophilinae), The Coleopterists Bulletin 58 (4), pp. 603-609 : 603-608

Peploglyptus mulu , new species

( Figs. 2–12 )

Holotype female: [Malaysia]: ‘‘ SARAWAK: 4th Division Gn. Mulu NP.’’/ ‘‘nr. Camp 1 150-200 m.’’/ ‘‘ex. flood refuse’’/ ‘‘ P.M.Hammond & J.E.Marshall, v–viii. 1978, B.M.1978-49’’ [;3 8 50 9 N, 114 8, 0 9 E]; deposited in BMNH.

603

Paratype: 1, same data as type; BMNH .

Description. Body elongate oval ( Figs. 2, 3 ), widest just behind humeral corners, darkly rufescent.

Dimensions (of holotype, in mm). Total (pronotal-elytral) length: 2.03; maximum (elytral) width: 1.62; pronotal length: 0.65; maximum pronotal width: 1.25; elytral length: 1.34; lengths of prosternum, mesosternum, metasternum, first visible abdominal sternite: 0.65, 0.09, 0.50, 0.25; propygidial length: 0.22; pygidial length: 0.47; lengths of protibia, mesotibia, metatibia: 0.59, 0.58, 0.67.

Head. antennal insertions high on frons, set within shallow emargination of upper anterior margin of eye ( Fig. 10 ); frons longer than wide, broadly depressed between strongly protuberant antennal bases, with prominent oblique carinae extended from antennal bases anteromesally, ending freely before reaching clypeolabral suture; epistoma strongly convex, elevated above labrum; vertex and frons with dense polygonal microsculpture, this less evident between antennal bases and along anterior margin of epistoma; labrum about twice as wide as long, weakly convex, narrowing arcuately to anterior margin, which is truncate to very shallowly emarginate; labral disk finely punctate, with a single elongate seta on either side nearer lateral margin than midline; left mandible apically bidentate, overlapping the right mandible in repose, their outer surfaces with fine punctures and more basally with increasingly evident reticulate microsculpture; ventral mouthparts not studied in minute detail, but the following are visible: maxillae prominent ventrally (cardo and stipes visible in lateral view); cardo glabrous, shining; stipes with two prominent setae parallel to anterolateral margin and few scattered minute setae; basal two maxillary palpomeres short, subequal, bearing inconspicuous setae along apical margins, with apparently only single longer setae near outer apex of penultimate; terminal maxillary palopmere about 2.25 times as long as penultimate, tapered and flattened slightly to rounded apex, lacking conspicuous setae; submentum strongly deflexed, anteriorly with transverse row of about 3 elongate setae near anterior margin, disk with reticulate microsculpture (mentum, maxilla, and labium lacking conspicuous microsculpture); mentum flat, anterior margin weakly tridentate, with prominent median tooth, but with anterolateral corners only faintly angulate; disk of mentum with about 3 elongate setae in irregular arrangement near middle and with much finer setae sparsely scattered throughout; basal labial palpomere very short, penultimate about 3 times as long, and expanded to apex, terminal labial palpomere about 1.25 times as long as penultimate, slightly swollen basally, tapered to narrowly rounded apex, with few fine setae on outer surface. Antennal insertion immediately anterior to dorsal margin of eye, somewhat hooded dorsally, open ventrally; scape ( Fig. 9 ) as long as eye, ovoid in cross section, widest just beyond middle, with an angulate emargination at posterior apex, a single elongate seta arising from the inner apex; scape in repose resting along anterior margin of eye, its inner surface arcuate and shallowly concave, its anterior surface with reticulate microsculpture and very fine setae; pedicel ( Fig. 9 ) inserted in angulate posteroapical emargination of scape, abruptly curved and widened from base, about one-fourth length of scape, with sparse setae subequal in length to its diameter; antennomeres 3–8 short, cylindrical, approximate ratio of lengths 1.67:1:1:1:1:1.34; antennomeres 3–7 with crown of short subapical setae; antennal club widest near base, somewhat acuminate, undivided with annuli inconspicuous, some setae in irregular transverse bands, setae more irregularly scattered and elongate toward apex.

Dorsum. Prothorax noticably narrower than elytra at base (with apex of profemur resting on base of elytra in repose), sides strongly sinuate, narrowed strongly anterad; anterior pronotal margin broadly emarginate; deepest lateral emargination of pronotum approximately two-thirds from base, continuous with deep dorsolateral pit (trichome), these connected across dorsum by shallow, posteriorly arcuate, transverse depression, these pits and connecting depression lined with clubbed setae, strongly encrusted with adherent soil particles (likely to obscure trichome almost entirely; Figs. 2, 4 ); pronotal disk immediately in front of transverse depression with broad, slightly elevated, shallowly bifid tubercle, this bearing clustered clubbed setae at apices; pronotum otherwise with smaller clubbed setae lining anterior and lateral margins, as well as sparsely scattered in front of transverse depression; basal one-third with only very minute setae, shining, with large, shallow, umbilicate punctures separated by slightly less than their widths basally, becoming sparser nearer transverse depression.

Elytra broad, convex, sides rounded, strongly narrowed to apex; basal elytral margin finely crenulate; scutellum visible, small, triangular; elytral dorsum with two prominent longitudinal costae laterally (apparently corresponding to the inner subhumeral and stria 1), and two very weak costae (putatively dorsal striae 3 and 5), their crests with short clubbed setae, intervals between them shallowly depressed, with minute scale-like setae and large umbilicate punctures, both arranged in more or less distinct longitudinal series; sutural stria absent; epipleuron with additional costae, one (outer subhumeral?) arcuate from basal corner nearly to midpoint of inner subhumeral, which it joins, the other sinuately following ventral epipleural margin.

Propygidium transverse about 3 3 as wide as long, nearly vertical, depressed along anterior margin, but with apical margin elevated; pygidium about as long as wide, sides arcuate, more or less flat, weakly depressed in anterior corners; both propygidium and pygidium densely encrusted with soil, surface texture obscured.

Sterna. Prosternum ( Fig. 3 ) about half as long as prothoracic width; prosternal keel broad, emarginate posteriorly, with oblique, widely separated longitudinal carinae in basal half, broadly depressed between carinae (though faintly elevated along midline); prosternum transversely depressed at middle, with deeply impressed trichomes on either side immediately adjacent to keel; setae of trichomes not evident, but likely visible in clean specimens, the transverse and lateral depressions densely encrusted with fine soil particles in types; prosternal disk laterally with elevated sinuate carina extending from inner corner of procoxa anterad along outer margin of trichome, thence laterad asymptotically to anterior prosternal margin; a short longitudinal carina extended between lateral corner of procoxa and anterior prosternal margin, the prosternal disk between these carinae glabrous, with reticulate microsculpture and large dense umbilicate punctures; anterior prosternal margin sinuate, with lobe bluntly produced beneath head. Mesosternum short, nearly 8 3 as wide as long, anterior margin sinuate, weakly projecting at middle,disk finely punctate,with short marginal stria only in extreme lateral corners; mesometasternal suture arcuate, finely impressed; mesepimeron extending from mesocoxa nearly to humeral elytral corner (not meeting pronotum), its anterior surface excavate for reception of procoxa, ventral surface with large, deep punctures; median metasternal suture finely impressed, obsolete only at posterior extreme; metasternal disk with shallow umbilicate punctures separated by slightly more than their widths, with finer punctures interspersed; postmesocoxal stria extending from inner corner of coxa arcuately to inner edge of metepisternum; metepisternum exposed, narrowed by about one-third anterad, with single series of deep, closely set punctures; metepimeron triangular, with inner apex bluntly meeting metacoxa, coarsely punctate. First visible abdominal sternite short, broad, punctate as on metasternum, with postmetacoxal stria extending from inner metacoxal corner sinuately to posterior margin of sternite; other abdominal sternites very short, largely concealed, with few coarse punctures and reticulate microsculpture at sides.

Legs. Profemur tapered to apex, undersurface flat, longitudinally depressed along apical twothirds of posteroventral margin, shallowly punctate and with reticulate microsculpture; meso- and metafemora slender, lower surfaces convex, depressed along posterior margins, with reticulate microsculpture and small punctures each bearing a minute scale-like seta (these faintly evident, and possibly abraded, in profemoral punctures as well); protibia ( Fig. 5 ) with inner margin weakly arcuate, finely setose, outer margin more broadly arcuate, widest about two-thirds from base, with continuous series of small stout spines extending nearly to apex, the distal-most slightly set apart from, and markedly larger than, those preceding; apex of protibia without evident spurs, but with few small apical spines; tarsal groove of upper surface poorly developed, evident only near apex, tarsi apparently not fully retractile; meso- and metatibiae ( Figs. 6, 7 ) more slender, with spines of outer margins finer, little more than scale-like setae; meso- and metatarsi nonretractile; all tarsi ( Fig. 8 ) similar, 5-5-5, approximate ratio of tarsomere lengths 1.25:1:1:1:2.25, laterally compressed, with fine, sparse setae on upper surfaces, and (on tarsomeres 1–4) two longitudinal series of 2–3 spines ventrally; ultimate tarsomere expanded apically, rounded; pretarsal claws nearly straight, only slightly divergent, nearly as long as ultimate tarsomere.

Ovipositor. Valvifer ( Fig. 11 ) paddlelike, proximal expanded surface weakly sclerotized; coxite ( Figs. 11, 12 ) 0.8 3 as long as valvifer, strongly sclerotized, bidentate, with elongate setae on inner surfaces (arrangement of setae shown in Fig. 11 is mirrored exactly on opposing coxite); gonostyle cylindrical, bearing 2 setiform, and 3–4 digitiform setae at apex; short digitiform seta present in articulating membrane at base of gonostyle.

Etymology. Mulu is the name of the highest peak in Gunung (Mt.) Mulu National Park.

Figures

Figs. 2–4. Dorsal, ventral, and lateral photographs of Peploglyptus mulu Caterino.

Figs. 5–10. Peploglyptus mulu Caterino. 5) Posterior (outer) face of protibia; 6) anterior (outer) face of mesotibia; 7) anterior (outer) face of metatibia; 8) metatarsus; 9) lateral view of left antenna; 10) lateral view of head (antenna not shown) and prothorax (pronotal and prosternal trichomes stippled).

Figs. 11–12. Peploglyptus mulu Caterino. 11) Ovipositor; 12) detail of apex of coxite and gonostyle.