Oiceoptoma tangi Sommer, Růžička, Nishikawa & Schneider, 2021

Sommer, David, Růžička, Jan, Nishikawa, Masaaki & Schneider, Jan, 2021, Oiceoptoma tangi (Coleoptera: Silphidae: Silphinae), a new species of carrion beetle from eastern China, Zootaxa 4949 (3), pp. 445-472 : 466-469

publication ID	https://doi.org/ 10.11646/zootaxa.4949.3.2
publication LSID	lsid:zoobank.org:pub:963F4818-A172-4B1D-A17A-86EB529BCFEB
DOI	https://doi.org/10.5281/zenodo.4647777
persistent identifier	https://treatment.plazi.org/id/A11D4862-FFF3-FF98-FF79-FF5C8718FCC5
treatment provided by	Plazi
scientific name	Oiceoptoma tangi Sommer, Růžička, Nishikawa & Schneider
status	sp. nov.

Treatment

Oiceoptoma tangi Sommer, Růžička, Nishikawa & Schneider , new species

( Figs. 1A–F View FIGURE 1 , 3D–F View FIGURE 3 , 4A, D View FIGURE 4 , 5A, D View FIGURE 5 , 6A, D View FIGURE 6 , 7A–C View FIGURE 7 , 8A, C–D View FIGURE 8 , 9A–B View FIGURE 9 , 10A–D View FIGURE 10 , 11A–B View FIGURE 11 , 12A, D View FIGURE 12 , 13A–B View FIGURE 13 , 14 C–E View FIGURE 14 , 15A–B, F View FIGURE 15 , 17A–C View FIGURE 17 )

Oiceoptoma subrufum: Růžička et al. 2004: 47 (misidentification).

Type locality. China, Zhejiang Province, Anji City, Longwangshan Mt., Pinxi Creek , 30°24′N, 119°27′E, alt. 1000– 1100 m GoogleMaps .

Type material (30 specimens). Holotype, ♂ ( SNUC) , “ China: Zhejiang Prov. | Anji City | Longwangshan Mt. | Pinxi Creek | 30°24′N, 119°27′E || alt. 1000~ 1100 m | 09-VI-2012 | HU & YIN leg. [p]” GoogleMaps . Paratypes, 6 ♂♂ 3 ♀♀ ( SNUC) , 1 ♂ 1 ♀ ( BMNH) , 2 ♂♂ 2 ♀♀ ( JRUC) , same data as holotype GoogleMaps ”; 2 ♂♂ 3 ♀♀ ( SNUC) , “ China, Zhejiang Prov. | Anji County | Shenxi | 30° 25′ N, 119° 24′ E | alt. 400 m, 07-VI-2012 | ZHU Jian-Qing leg. [p]” GoogleMaps ; 1 ♀ ( EUMJ) , “中国 [= China] 浙江省 [= Zhejiang Prov.] OiṘ市 [= Lin’an-shi] | MRH山 [= Mt. West Tianmu Shan ] | 6~ 11–V–1998 | 李李ù [= Li-Zhen Li] IJDz [= leg.] [p]” ; 1 ♀ ( SNUC) , “16~20–V–20 [p] 06 [hw] | MRH山 [= Mt. West Tianmu Shan ] 临Ṙ [= Lin’an-shi] [hw] | 浙江 [= Zhejiang Prov.] Bwx [hw] || Mt. w. Tianmu | 16~20. V, 2006 | Bi Wen-xuan leg. [hw]” ; 1 ♂ ( SNUC) , “ West Tianmushan | Lin’an County | 11~ 15–VI–2006 | alt. 300–400 m | HU & TANG leg. [p]” ; 1 ♀ ( SNUC) , “ China: Zejiang Prov. | Lin’an City | Mt. West Tianmu | alt. 300~ 500 m | 29–V~ 3–VI–2010 | Jian-Qing ZHU leg. [p]” ; 1 ♂ ( JRUC, DNA voucher JRUC-SIL-0054), “ CHINA: Zhejiang Prov., | Lin’an County, West | Tianmushan Nat. Res. , | 250 m NW of Original | Temple of Lion Sect , | 30.3431°N 119.4316°E, | J. Hájek & J. Růžička leg. || (WT10) 2.–6.vii.2017; || 1165 m, baited pitfall | traps #06 (fish meat, | ripening cheese), broad- | leaved deciduous forest | with Rhododendron [p]” GoogleMaps ; 2 ♀♀ ( JRUC, DNA vouchers JRUC-SIL- 0010, JRUC-SIL-0011), “ CHINA: Zhejiang Prov., | Lin’an County, West | Tianmushan Nat. Res. , | 250 m NW of Original | Temple of Lion Sect , | 30.3431°N 119.4316°E, | Cheng-Bin Wang leg. || (WT10) 2.–6.vii.2017; || 1165 m, baited pitfall | traps #06 (fish meat; alcohol, vinegar + sugar), broad- | leaved deciduous forest | with Rhododendron [p]” GoogleMaps ; 2 ♂♂ ( JSCC) , “NW. CHINA | TIENMUCHAN [without date and collector’s name, hw with a pencil] || Oiceoptoma | subrufum | ( Lewis, 1888) ♂ | Jan Růžička det. 200[p]3[hw]” .

Description. Male ( Figs. 1A–C View FIGURE 1 ). Body oval, dorso-ventrally flattened. Pronotum orange with four black spots ( Fig. 4A View FIGURE 4 ). Elytra light to dark brown. Head, antennae, legs and ventral part of body black. Flight wings fully developed, functional ( Fig. 8A View FIGURE 8 ).

Head. Black, lustrous surface with regular punctation ( Fig. 3D View FIGURE 3 ). Covered with short, recumbent orange setation. Clypeus anteriorly widely notched ( Fig. 8D View FIGURE 8 ). Anterior margin of clypeus with slightly irregular row of dense, long, orange setation in dorsal view. Eye kidney-shaped in lateral view ( Fig. 17C View FIGURE 17 ). Head with short row of long erect setae behind eyes ( Fig. 3D View FIGURE 3 ). Frons with marked dorsal tentorial pits and a transverse, elevated crest posteriorly ( Figs. 3D View FIGURE 3 , 17C View FIGURE 17 ). Maxilla with deeply punctuated cardo and base of stipes in ventral view, covered by long setae ( Fig. 3E View FIGURE 3 ).

Antennae. Medium-sized, with last four antennomeres forming a distinct club ( Figs. 7A–C View FIGURE 7 ).

Pronotum moderately transverse, widest posteriorly ( Fig. 4A View FIGURE 4 ). Pronotal disc orange, medially with four black, vaguely delimited spots, arranged in symmetrical, trapezoidal pattern ( Fig. 4A View FIGURE 4 ). Spots are regularly covered with fine, distinct punctures, bearing long, orange setation ( Fig. 4D View FIGURE 4 ). Margin rimmed only in anterior half; anteriorly with wide, shallow excision, which is medially straight; anterior angles weakly elevated. Posterior margin slightly sinuous, weakly sinuate postero-laterally ( Figs. 4A View FIGURE 4 , 6A View FIGURE 6 ). Surface with dense punctation, punctures medium-sized, clearly separated, from disc to margin deeply impressed ( Figs. 4A View FIGURE 4 , 5D View FIGURE 5 ). Pronotum covered with longer, orange setation.

Scutellum. Irregularly triangular, widely vaulted medially. Surface with dense, distinct, homogenous punctation; covered with longer orange setation, semierect anteriorly and distinctly recumbent medially and posteriorly ( Fig. 6A View FIGURE 6 ).

Elytra subparallel, at the widest point (along 2/3 of its length) wider than pronotum ( Fig. 1A View FIGURE 1 ). Humerus with distinct denticle ( Fig. 3F View FIGURE 3 ). Elytron with three distinctly elevated ridges; only first and second ridge reaching apex of elytron; external ridge shortest, reaching only two thirds of elytral length ( Figs. 1A View FIGURE 1 , 6D View FIGURE 6 , 9A View FIGURE 9 ). Second ridge in last third slightly sinuous ( Fig. 9A View FIGURE 9 ). Third ridge posteriorly terminated at apical callus ( Fig. 9A View FIGURE 9 ). Ridges on both sides covered with a row of short, recumbent, black setae. Lateral margin of elytra strongly elevated only in anterior half, disappearing posteriorly. Apex of elytron regularly rounded ( Figs. 1A View FIGURE 1 , 9A View FIGURE 9 ). Basal part of elytra and humeri with short, recumbent, black setae ( Fig. 3F View FIGURE 3 ). Surface dull, with isodiametric microsculpture ( Figs. 6A, D View FIGURE 6 ); subapical surface regularly flat, without rugosities; with dense, distinct, regular punctation; punctures clearly separated by spaces 1.0–1.5 times their own diameter ( Figs. 6D View FIGURE 6 , 9A View FIGURE 9 ). Elytra with distinct, subrectangular punctures, with bluish metallic lustre covering most of the surface in ventral view ( Figs. 8A, C View FIGURE 8 ). Elytral epipleura sparsely, finely but distinctly punctured in ventral view ( Fig. 8A View FIGURE 8 ).

Ventrum finely punctate, covered with short, recumbent, brown to black setation ( Figs. 5A View FIGURE 5 , 10C View FIGURE 10 ). Proventrite with dense punctation laterally; medially dark brown to black, laterally widely orange in ventral view ( Fig. 5A View FIGURE 5 ). Mesocoxae widely separated ( Fig. 10C View FIGURE 10 ). Abdominal ventrites with distinct impressions laterally in ventral view ( Figs. 1B View FIGURE 1 , 15A View FIGURE 15 ). Ventrite 6 extremely reduced in length medially, with expanded brick-wall pattern on intersegmental membrane ( Figs. 15A–B, F View FIGURE 15 ).

Legs. Protarsomeres 1–4 only slightly expanded, covered with short, dense, yellow setation ( Figs. 14C–D View FIGURE 14 ). Pro-, / meso- and metatibia with two apical spurs of different length ( Figs. 14C–D View FIGURE 14 ). Metatibia almost straight, only very slightly curved in ventral view ( Fig. 10D View FIGURE 10 ).

Abdominal segments. Tergite 10 relatively short in length ( Fig. 12A View FIGURE 12 ). Ventrite 9 oval, elongate, anteriorly as long as tergite 9, constricted and deeply desclerotized medially in ventral view ( Fig. 12D View FIGURE 12 ). Spiculum gastrale robust, elongate in ventral view ( Fig. 12D View FIGURE 12 ).

Aedeagus. Median lobe stout, robust, gradually tapered to widely rounded, triangular apex ( Figs. 11A–B View FIGURE 11 ). Internal sac heavily sclerotized, medial portion composed of a great number of very small, regular, rounded denticles; basal part containing two strips of elongate, slender denticles ( Fig. 11B View FIGURE 11 ). Parameres robust, almost straight, longer than median lobe, subapically constricted with rounded apex ( Figs. 11A–B View FIGURE 11 ). Basal portion widely oval, very narrow, markedly exceeding the width of aedeagus ( Figs. 11A–B View FIGURE 11 ).

Sexual dimorphism. Female. Similar to male except for the following structures: Protarsus simple, basal protarsomere elongated ( Fig. 14E View FIGURE 14 ). Apex of elytron elongated to a blunt tip ( Figs. 1D–E View FIGURE 1 , 8A View FIGURE 8 , 9B View FIGURE 9 ). Tergum 7 with distinct, deep, narrow, U-shaped medial emargination ( Fig. 17A View FIGURE 17 ). Tergum 8 subquadrate, regularly rounded posteriorly ( Figs. 13A View FIGURE 13 , 17A View FIGURE 17 ). Ventrite 8 widely transverse ( Figs. 13B View FIGURE 13 , 17B View FIGURE 17 ). Tergite 9 elongate, rounded; tergite 10 pentagonal, apex posteriorly regularly rounded with dense microsetae ( Figs. 10A–B View FIGURE 10 , 13A View FIGURE 13 ). Coxite laterally constricted on outer margin subapically in ventral view; stylus inserted lateroapically, its length slightly shorter than apex of coxite ( Figs. 10A–B View FIGURE 10 , 13A–B View FIGURE 13 ).

Measurements. Elytra length 5.81–6.82 mm in males (mean 6.30 mm; 6.27 mm in the holotype), 6.72–7.26 mm (mean 6.96 mm) in females; pronotum length 3.41–3.82 mm in males (mean 3.63 mm; 3.55 mm in the holotype), 3.50–3.81 mm (mean 3.62 mm) in females; pronotum width 5.62–6.66 mm in males (mean 6.07 mm; 5.92 mm in the holotype), 5.63–6.42 mm (mean 6.10 mm) in females.

Variability. Elytra mostly dark brown, light brown in some (probably subteneral) specimens. Spots on pronotum slightly differently delimited, being less separated from surrounding surface in some specimens.

Differential diagnosis. Oiceoptoma tangi Sommer, Růžička, Nishikawa & Schneider , new species, is similar and probably closely related to O. nigropunctatum and O. subrufum . All three species share the following combination of characters: (1) orange pronotum with relatively short pubescence; (2) four dark spots on pronotal disc; (3) dark brown/black elytra with narrow epipleura; and (4) absence of patchy velvet pattern on elytral dorsal surface (see Růžička et al. (2004) for more details).

The three species can be separated from each other using the character states listed in the modified key and in Table 1 View TABLE 1 below.

Etymology. Patronymic, named after Liang Tang (Shanghai, China), an enthusiastic specialist of staphylinoid beetles ( Agyrtidae , Staphylinidae : Steninae , Scaphidiinae , Staphylininae , Omaliinae etc.), who first recognized this species was unnamed.

Collecting circumstances. The large type series was collected near Pinxi Creek on old large mammal carrion, together with numerous Necrodes littoralis ( Linnaeus, 1758) (Silphidae) , Creophilus maxillosus ( Linnaeus, 1758) (Staphylinidae) and some clown beetles ( Histeridae ) ( Figs. 18A–C View FIGURE 18 ). Three specimens were also collected on West Tianmushan, 250 m above the Original Temple of Lion Sect, using fish-baited pitfall traps in a broadleaved deciduous forest with Rhododendron ( Figs. 19A–B View FIGURE 19 ). The specimens were collected between May and the beginning of July.

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Distribution. So far known only from three localities (Longwangshan Mt., Shenxi, Tianmu Shan Mts.) in Zhejiang Province, China ( Figs. 20–21 View FIGURE 20 View FIGURE 21 ).