Omineus taiwanensis, Hsiao & Pollock, 2019

Hsiao, Yun & Pollock, Darren A., 2019, Contribution to the knowledge of the genus Omineus Lewis, 1895 in Taiwan, with description of two new species (Coleoptera, Mycteridae, Eurypinae), Zootaxa 4568 (3), pp. 533-547 : 535-538

publication ID	https://doi.org/ 10.11646/zootaxa.4568.3.7
publication LSID	lsid:zoobank.org:pub:512A8301-C51D-48A0-A7B7-484A3180C40A
DOI	https://doi.org/10.5281/zenodo.5930751
persistent identifier	https://treatment.plazi.org/id/038D87F3-FFE8-FFD6-FF16-FC1C51FCFAFF
treatment provided by	Plazi
scientific name	Omineus taiwanensis
status	sp. nov.

Treatment

Omineus taiwanensis sp. nov.

( Figs. 3–4 View FIGURES 1–6 , 7–8 View FIGURES 7–10 , 11–12, 15–16 View FIGURES 11–18 , 19–20, 23–24 View FIGURES 19–26 , 27–30 View FIGURES 27–32 , 33–36 View FIGURES 33–38 , 39–42, 45–48, 51)

Type material. Holotype ♂, Meifeng , Jenai, Nantou, Taiwan, 9. III.–9. IV. 1998, Malaise trap, C.- S. Lin & W.- T. Yang leg. // NMNS ENT 3243-511 View Materials (NMNS). Paratypes: 1 ♀, Meifeng , Nantou, Taiwan, 12. III.–9. IV. 2002, Malaise trap ( KCN), C.- S. Lin & W.- T. Yang leg. // NMNS ENT 4912-49 View Materials ( NMNS) ; 1 ♀, Meifeng , Nantou, Taiwan, 6. IV.–11. V. 2004, Malaise trap ( KCN), C.- S. Lin & W.- T. Yang leg. // NMNS ENT 5778-439 View Materials ( NMNS) ; 1 ♂, Meifeng , Nantou, Taiwan, 11. I.–15. II. 2005, Malaise trap ( KCN), C.- S. Lin & W.- T. Yang leg. // NMNS ENT 7484-153 View Materials ( NMNS) .

Description. Male ( Fig. 3 View FIGURES 1–6 ). Body length: 5.00– 5.50 mm (5.50 in holotype); width: 1.50–1.70 mm (1.70 in holotype).

Coloration. Head blackish brown; mouthparts brown. Antennae blackish brown, with scape, pedicel and antennomere XI brown (in holotype) or entirely blackish brown (in paratype). Prothorax blackish brown, with median part of posterior pronotal margin reddish brown. Scutellar shield, elytra, and meso- and metaventrites blackish brown. Abdomen orange. Legs blackish brown.

Head ( Fig. 7 View FIGURES 7–10 ) short and rounded, with vertex moderately convex, slightly wider than long; surface semilustrous, coarsely and densely punctate, with fine, dense, decumbent yellowish pubescence. Eyes large, globular and prominent, protruding laterally, ratio of eye diameter to interocular space 1.00:1.70–1.85. Clypeus short, flat, broad, distal margin truncate, with some yellowish setae on distal margin of disc. Apical maxillary palpomeres ( Fig. 11 View FIGURES 11–18 ) rounded, securiform. Antennae ( Fig. 15 View FIGURES 11–18 ) short, exceeding slightly the anterior angles of pronotum; scape and pedicel robust, antennomeres III–V filiform, VI–VII submoniliform, VIII–X scaphiform, forming a weak club, XI ovoid, spindle-shaped apically; relative lengths of each antennomere: 11.0– 12.0:10.0:11.5–14.0:7.5–8.0:7.0–7.5:7.0–8.0:7.0–7.5:7.0–7.5:8.0–8.5:8.0:11.0–14.0.

Pronotum ( Fig. 19 View FIGURES 19–26 ) subrectangular, approximately the same width as the head, 0.70–0.85X longer than wide; surface semilustrous, coarsely and densely punctate, with fine, dense, decumbent yellowish pubescence; lateral margins weakly sinuate, widest near mid-length; anterior margin extremely weakly arcuate; posterior margin somewhat arcuate; anterior angles rounded; basal angles rectangular; disc weakly convex, with paired, extremely shallow depressions medially and paired small, deep posterior foveae; foveae connected by shallow groove along basal margin. Scutellar shield slightly wider than long, weakly convex, slightly acuminate apically; surface semilustrous, shallowly and coarsely punctate, with extremely dense, decumbent yellowish pubescence.

Elytra ( Fig. 23 View FIGURES 19–26 ) approximately 1.6–1.8X wider than pronotum, 2.3–2.4X longer than wide, moderately widened posteriorly; surface semilustrous, rugulose-lacunose, with two, paired sutural patches and three, paired marginal patches consisting of fine, dense, decumbent yellowish pubescence, forming the elytral pattern.

Ventral surface shallowly, coarsely and densely punctate, covered with fine, dense, decumbent yellowish pubescence. Abdominal ventrite 2 ( Figs. 27–30 View FIGURES 27–32 ) with sex patch prominent, brownish, setose, mesally gibbose, with length much greater than half the mesal length of ventrite 2. Pygidium ( Fig. 34, 36 View FIGURES 33–38 ) broadly rectangular, apical margin weakly and widely emarginate medially, sparsely pubescent. Abdominal sternite 8 ( Figs. 33, 35 View FIGURES 33–38 ) emarginate in middle of apical margin, forming two, roundly angular lobes on both sides, moderately pubescent apically.

Legs slender and relatively short. Claws simple, with basal swelling.

Male genitalia with median lobe oriented dorsad the tegmen; abdominal sternite 9 forming ring-like sclerite. Tegmen (Figs. 39–42) with basale (= basal piece) relatively short, stout, deeply concave basally, sides sinuate, narrowed distally, approximately 1.2–1.3X longer than apicale (= parameres); apicale approximate basally, becoming widely separated apically, acuminate and strongly incurvate distally. Median lobe (Figs. 45–48) stout, hastate, divided into broad basal disc and ensiform apex, basal disc with length approximately 0.85–0.90X eniform apex; basal disc explanate, produced basolaterally; apex ensiform, tapered apically.

Female ( Fig. 4 View FIGURES 1–6 ). Body length: 5.75–6.00 mm; width: 1.90–2.00 mm.

Very similar to male. Head reddish brown; maxillary palpi reddish brown, with apex of each palpomere orange; labrum reddish brown, with apical margin orange; remaining mouthparts reddish brown to orange. Antennae reddish brown to orange. Prothorax reddish brown, with median part light reddish brown, with orange tinge. Scutellar shield reddish brown. Elytra brown, with humeri and regions of elytral pattern yellowish brown. Meso- and metaventrites and legs reddish brown to orange. Abdomen orange. Eyes ( Fig. 8 View FIGURES 7–10 ) distinctly smaller and less protruding than in males, ratio of eye diameter to interocular space 1:2.40–2.60. Apical maxillary palpomeres ( Fig. 12 View FIGURES 11–18 ) rounded securiform. Antennae ( Fig. 16 View FIGURES 11–18 ) with relative lengths of each antennomere: 11.0– 11.5:10.0:10.5:8.0:8.0:7.0–7.5:7.0–7.5:7.0:7.0:8.0–8.5:10.5–12. Pronotum ( Fig. 20 View FIGURES 19–26 ) approximately 1.10–1.13X wider than head, 0.72X longer than wide. Elytra ( Fig. 24 View FIGURES 19–26 ) approximately 1.7–1.8X wider than pronotum, 2.0–2.3X longer than wide, gradually widened posteriorly. Abdominal ventrite 2 without sex patch.

Ovipositor ( Fig. 51 View FIGURES 51–52 ) with sides subparallel, moderately narrowed apically. Paraproct elongate, with length approximately 1.6X coxite, 2.0X longer than wide; proctiger with apex rounded; two distinct ventral and dorsal baculi present. Coxites segmented, sparsely pubescent. Styli short, subcylindrical, inserted subapically.

Diagnosis. This new species is distinguishable from its congeners (excluding Omineus chuangae sp. nov.) by the characteristic elytral pattern. It closely resembles O. chuangae sp. nov., but can be easily recognized by the orange abdomen (dark in O. chuangae ), medially reddish brown posterior pronotal margin in males (unicolorous in O. chuangae ), lighter body coloration in females; larger body size and relatively longer elytra; larger eyes in males; slenderer antennomere XI in males; slightly narrower pronotum in males; elytral pattern with two, paired sutural patches and separated sutural and marginal patches (three, paired sutural patches and median sutural patches and median marginal patches conjoined in O. chuangae ); narrower and more elongate sex patch in dorsal view; setae comprising sex patch, which are denser and decumbent; aedeagus with narrower apicale and apex of median lobe.

Etymology. The specific name is derived from “ Taiwan ”, referring to the only known distribution of this new species.

Distribution. Taiwan (presumed endemic). Specimens were collected from a Malaise trap at the type locality, Meifeng, in central Taiwan, at an elevation of approximately 2,100 meters.