Oxyporus pendleburyi Cameron, 1936

Senda, Yoshihiro, 2021, Revision of the genus Oxyporus Fabricius (Coleoptera: Staphylinidae: Oxyporinae) of the Malay Peninsula, Raffles Bulletin of Zoology 69, pp. 8-12 : 8-10

Oxyporus pendleburyi Cameron, 1936

Oxyporus pendleburyi Cameron, 1936: 41 [original description]; Herman, 2001: 1987 [catalogued].

Oxyporus pendleburyi var. intermedius Cameron, 1936: 41 [original description]; Herman, 2001: 1987 [catalogued; as infraspecific taxon] –––– new synonym.

Oxyporus pendleburyi var. atratus Cameron, 1936: 41 [original description]; Herman, 2001: 1987 [catalogued; as infraspecific taxon] –––– new synonym.

Type specimens examined. Oxyporus pendleburyi Cameron, 1936 . Holotype (NHML; designated by monotypy): male, “ Type ” [printed on white round label with red border], “ PAHANG, F.M.S. / “ Cameron’s High- / lands”.” [printed on white label], “on fungus 4800 ft. / 18.VI.1923 / H.M. Pendlebury ” [handwritten on white label, but partly printed], “O. / pendleburyi / TYPE [red, underline] Cam.” [handwritten

RAFFLES BULLETIN OF ZOOLOGY 2021

on white label], “ M. Cameron. / Bequest / B.M.1955- 147” [printed on white label], “ HOLOTYPE / Oxyporus pendleburyi / Cameron, 1936 / des. Y. Senda, 2019” [printed on red label with black border] .

Oxyporus pendleburyi var. intermedius Cameron, 1936 . Holotype (NHML; designated by monotypy): male, “Type” [printed on white round label with red border], “ PAHANG, F.M.S. / “Cameron’s High- / lands.”” [printed on white label], “on fungus 4800 ft. / 18.VI.1923 / H.M. Pendlebury” [handwritten on white label, but partly printed], “O. / v. intermedius / TYPE [red, underline] Cam.” [handwritten on white label], “M. Cameron. / Bequest / B.M.1955- 147” [printed on white label], “ HOLOTYPE / Oxyporus pendleburyi / v. intermedius Cameron, 1936 / des. Y. Senda, 2019” [printed on red label with black border].

Oxyporus pendleburyi var. atratus Cameron, 1936 . Holotype (NHML; designated by monotypy): male, “Type” [printed on white round label with red border], “ PAHANG, F.M.S. / “Cameron’s High- / lands.”” [printed on white label], “on fungus 4800 ft. / 18.VI.1923 / H.M. Pendlebury” [handwritten on white label, but partly printed], “O. / v. atratus / TYPE [red, underline] Cam.” [handwritten on white label], “M. Cameron. / Bequest / B.M.1955-147” [printed on white label], “ HOLOTYPE / Oxyporus pendleburyi / v. atratus Cameron, 1936 / des. Y. Senda, 2019” [printed on red label with black border].

Redescription. Male. Colouration: Body yellow to reddish brown, shining; mouthparts yellow, except for blackish mandibles and maxillary palpi; elytra yellow, except blackish lateral sides and apical margin with black macula on the outer angle, or entirely reddish brown (without any maculae); tibiae dark yellow to blackish brown; femora yellow, except for the blackish basal part; tarsi brown; abdomen yellow, except the blackish middles of ventrites III–V, the middle of tergum V, segments VI,VII and the basal 2/3 of VIII, but often entirely reddish brown.

Body robust, slightly convex dorsally. Head circular, widest at the anterior 1/4 of the temple. Eyes moderate in size, prominent. Antennae stout; antennomere I fusiform, widest at the middle; antennomeres II and III cylindrical; antennomere IV slightly dilated apically, slightly flat; antennomere V dilated apically, flat; antennomeres VI to XI flat, densely pubescent in the side area; antennomeres VI to X more or less oblong, and XI bullet-shaped; the length/width ratio of each antennomere I to XI as follows: 2.3, 1.1, 1.0, 0.7, 0.5, 0.4, 0.4, 0.4, 0.4, 0.4, 1.2; relative lengths of segments: 31.2: 11.2: 10.0: 10.0: 11.2: 11.5: 11.5: 11.5: 11.5: 11.5: 24.2, and relative widths: 13.3: 10.0: 10.0: 14.1: 20.7: 25.2: 25.6: 25.6: 25.6: 24.8: 19.3.

Pronotum subhexagonal, widest at the anterior 1/3; disc smooth, with a medial sulcus and shallow basal longitudinal sulci; lateral sides weakly depressed in the basal 1/2, well expanded to the widest point, thence narrowed basally, with three setae on the apical 1/4, 1/2 and 3/4; anterior margin feebly emarginated at the middle, with four setae on the middle to near corners, respectively; posterior margin arcuate, with two setae on the middle. Scutellar shield impunctate, with a truncate apex. Elytra subquadrate, feebly dilated apically; disc with several irregular punctures, with two punctulate striae, whose outer stria is arranged from the anterior 1/5 to 3/4, and is feebly oblique, and inner stria is arranged from the anterior 1/4 to the near posterior margin and is longitudinal; lateral and posterior margins with several setae. Basisternum asetose; inner coxal process short, pointed at the apex. Metaventrite sparsely clothed with tiny colourless

PL: 1.27–1.37 mm (1.31 ± 0.05 mm); PW: 1.44–1.53 mm (1.49 ± 0.05 mm); EL: 1.72–1.88 mm (1.79 ± 0.08 mm); EW: 2.22–2.34 mm (2.29 ± 0.06 mm). HL/HW = 0.85–0.88 (0.87 ± 0.02); AL/FBL = 0.30–0.31 (0.30 ± 0.01); PL/PW = 0.84–0.90 (0.88 ± 0.03); PW/HW = 0.91–0.97 (0.95 ± 0.03); EL/EW = 0.74–0.81 (0.78 ± 0.04); EW/PW = 1.52–1.55 (1.54 ± 0.02).

Remarks. Cameron (1936) distinguished O. pendleburyi var. intermedius and O. pendleburyi var. atratus from O. pendleburyi by its colouration. These two taxa are valid as subspecific, refer to Articles 10.2 and 45.6.4 of ICZN (1999). After careful observations of their morphological characters, including male genital organs, I was unable to clearly distinguish the two species. Thus, I concluded that the colour differences are due to infraspecific colour variations, and determined that O. intermedius and O. atratus are junior synonyms of O. pendleburyi . Additionally, it is suggested that this species shows noteworthy intraspecific colour variation. pubescence, with golden setae on the posterior area; inner coxal process truncate at the apex. Legs simple, rather thick.

Abdomen covered sparsely with minute punctures and indistinct alutaceous microsculpture; terga III and IV with a pair of wing folding setal patches on the middle, respectively; terga and ventrites VII and VIII with distinct shallow grooves on each posterior part; tergum VIII with about 22 setae, arcuate at the caudal margin; ventrite VIII with about 30 setae, slightly emarginated at the caudal margin; tergum IX setigerous in the apical 1/2, rounded in the apex; tergum X with a few macrosetae in the apicomedial area, densely fringed with tiny setae along the arcuate caudal margin; ventrite IX setigerous in the apical 1/2, with the basal margin incised into “V” and some fine setae arranged on the rounded apex.

Aedeagus ( Fig. 2A, B ) robust, weakly asymmetrical; median lobe barely twisted, with a basal capsule approximately 2/3 the length of the apical lobe; apical lobe weakly curved ventrally, narrowest at the basal 1/5, thence feebly dilated towards the widest point of the apical 1/ 4 in the ventral view, rounded at the apex in the ventral view; parameres slender, approximately 1/3 the length of the apical lobe, almost straight, gently narrowed towards the pointed apex in the ventral view; internal sac covered partly with small spicules, without any other sclerites; copulatory tube rather large, robust and feebly tapering apically.

Female. Unknown.

Measurement. Male (n = 3) –– BL: 7.46–7.64 mm (7.56 ± 0.09 mm); FBL: 4.38–4.60 mm (4.47 ± 0.12 mm); HL: 1.31–1.44 mm (1.37 ± 0.07 mm); HW: 1.49–1.66 mm (1.58 ± 0.09 mm); AL: 1.32–1.36 mm (1.35 ± 0.02 mm); This species is distinguishable from its similar congeners, O. drescheri Cameron, 1936 (Java) and O. annae Lundgren, 1985 (Java) , by colouration. As the colour differences in this genus are highly variable, the taxonomic aspects of these species require future research.

Figures

Fig.2.Oxyporus pendleburyi Cameron, holotype,male.A, aedeagus, ventral view; B, ditto, lateral view. Scale bar = 0.5 mm.