Contribution to the knowledge of the genus Omineus Lewis, 1895 in Taiwan, with description of two new species (Coleoptera, Mycteridae, Eurypinae) Author Hsiao, Yun Author Pollock, Darren A. text Zootaxa 2019 2019-03-21 4568 3 533 547 journal article 28118 10.11646/zootaxa.4568.3.7 e69bebc4-3979-4935-9ce5-1f4adb60006f 1175-5326 2601748 512A8301-C51D-48A0-A7B7-484A3180C40A Omineus chuangae sp. nov. ( Figs. 5–6 , 9–10 , 13–14, 17–18 , 21–22, 25–26 , 31–32 , 37–38 , 43–44, 49–50, 52–54) Type material. Holotype ♂ , Bruwan , Hualien , Taiwan , 13. I. 2018 , H.- F. Lu leg. (NMNS). Paratype : 1 ♀ , Bruwan , Hualien , Taiwan , 2. II. 2018 , H.- F. Lu leg. ( NMNS ) . Description. Male ( Fig. 5 ). Body length: 3.7 mm ; width: 1.2 mm . Head blackish brown; maxillary palpi blackish brown, with apical part of each palpomere brown; labrum blackish brown, with apical margin orange; remaining mouthparts brown. Antennae blackish brown. Prothorax entirely blackish brown. Scutellar shield, elytra, meso- and metaventrites, abdomen and legs blackish brown. Head ( Fig. 9 ) 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 1:1.65. Clypeus short, flat, broad, distal margin truncate, with some yellowish setae on the distal margin of the disc. Apical maxillary palpomeres ( Fig. 13 ) rounded, securiform. Antennae ( Fig. 17 ) 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: 11.5:10.0:10.5:8.5:8.5:8.5:8.0:8.0:7.5:9.5:15.0. FIGURES 11–18. Apical maxillary palpomere and antenna: 11–12, 15–16. Omineus taiwanensis sp. nov. , male holotype and female paratype; 13–14, 17–18. O. chuangae sp. nov. , male holotype and female paratype. 11–14. Apical maxillary palpomere; 15–18. Antenna. 11, 13, 15, 17. Male; 12, 14, 16, 18. Female. FIGURES 19–26. Pronotum and elytron: 19–20, 23–24. Omineus taiwanensis sp. nov. , male holotype and female paratype; 21–22, 25–26. O. chuangae sp. nov. , male holotype and female paratype. 19–22. Pronotum; 23–26. Elytron. 19, 21, 23, 25. Male; 20, 22, 24, 26. Female. Pronotum ( Fig. 21 ) subrectangular, approximately 1.05X wider than head, 0.70X longer than wide; surface semilustrous, coarsely and densely punctate, with fine, dense, decumbent yellowish pubescence; lateral margins weakly arcuate, widest near midlength; 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. 25 ) approximately 1.5X wider than pronotum, 2.2X longer than wide, moderately widened posteriorly; surface semilustrous, rugulose-lacunose, with three, paired sutural patches and three, paired marginal patches, forming elytral pattern, sutural and median patches contiguous. FIGURES 27–32. Sex patch of male: 27–30. Omineus taiwanensis sp. nov. , male holotype and paratype; 31–32. O. chuangae sp. nov. , male holotype. 27, 29, 31. Dorsal view; 28, 30, 32. Lateral view. Ventral surface shallowly, coarsely and densely punctate, covered with fine, dense, decumbent yellowish pubescence. Abdominal ventrite 2 ( Figs. 31–32 ) with sex patch prominent, brownish, setose, mesally gibbose, with length much greater than half the mesal length of ventrite 2. Pygidium ( Fig. 38 ) broadly rectangular, apical margin weakly and widely emarginate medially, sparsely pubescent. Abdominal sternite 8 ( Fig. 37 ) 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. FIGURES 33–38. Abdominal sternite VIII and pygidium of male: 33–36. Omineus taiwanensis sp. nov. , male holotype and paratype; 37–38. O. chuangae sp. nov. , male holotype. 33, 35, 37. Abdominal sternite VIII; 34, 36, 38. Pygidium. FIGURES 39–50. Aedeagus: 39–42, 45–48. Omineus taiwanensis sp. nov. ; 43–44, 49–50. O. chuangae sp. nov. 39–44. Tegmen; 45–50. Median lobe. 39, 41, 43, 45, 47, 49. Scale bar = 0.1 mm . Male genitalia with median lobe oriented dorsad the tegmen; abdominal sternite 9 forming ring-like sclerite. Tegmen (Figs. 43–44) with basale relatively short, stout, deeply concave basally, sides sinuate, narrowed distally, approximately 1.5X longer than apicale; apicale approximate basally, becoming widely separated apically, acuminate and strongly incurvate distally. Median lobe (Figs. 49–50) stout, hastate, divided into broad basal disc and ensiform apex, basal disc with length approximately 0.70X ensiform apex; basal disc explanate, produced basolaterally; apex ensiform, tapered apically. Female ( Fig. 6 ). Body length: 3.8 mm ; width: 1.2 mm . Very similar to male holotype . Head blackish brown; maxillary palpi blackish brown, with apical part of each palpomere brown; labrum blackish brown, with apical margin orange; remaining mouthparts brown. Antennae blackish brown. Prothorax blackish brown, with median part of anterior and posterior pronotal margin reddish brown. Scutellar shield blackish brown. Elytra blackish brown, with humeri and regions of elytral pattern yellowish brown. Meso- and metaventrites, abdomen and legs blackish brown. Eyes ( Fig. 10 ) distinctly smaller and less protruding than in holotype male, ratio of eye diameter to interocular space 1:2.30. Apical maxillary palpomeres ( Fig. 14 ) rounded securiform. Antennae ( Fig. 18 ) with antennomere XI slender, rounded, slenderer than in holotype male; relative lengths of each antennomere: 14.0:10.0:10.0:8.0:8.0:7.5:8.0:8.0:8.0:8.0:14.0. Pronotum ( Fig. 22 ) with anterior angles more rounded than in holotype male, approximately 1.10X wider than head, 0.70X longer than wide. Elytra ( Fig. 26 ) approximately 1.8X wider than pronotum, 2.2X longer than wide, gradually widened posteriorly. Abdominal ventrite II without sex patch. Ovipositor ( Fig. 52 ) with sides subparallel, moderately narrowed apically. Paraproct elongate, with length approximately 1.7X coxite, 1.7X longer than wide; proctiger with apex rounded; two distinct ventral and dorsal baculi present. Coxites segmented, sparsely pubescent. Styli short, subcylindrical, inserted subapically. Diagnosis. Specimens of this new species can be easily separated from its congeners (excluding Omineus taiwanensis sp. nov. ) by the characteristic elytral pattern; it is similar to O. taiwanensis sp. nov. ; see “Diagnosis” for O. taiwanensis , above, for a detailed comparison of these two species. Etymology. The specific name is dedicated to the wife of the collector of the type series, Ms. Ching-Yun Chuang ( Hualien , Taiwan ) for her continuous support and assistance during the collector’s fieldwork in Taiwan . FIGURES 51–52. Ovipositor: 51. Omineus taiwanensis sp. nov. ; 52. O. chuangae sp. nov. Scale bar = 0.5 mm. FIGURES 53–54. Field observations of Omineus chuangae sp. nov. from Bruwan, Hualien county: 53. Male holotype; 54. Female paratype. Photographed by Hsi-Feng Lu. Distribution. Taiwan (presumed endemic). This new species is only known from the type locality, Bruwan, in eastern Taiwan , at an elevation of approximately 370 meters. Natural history. Individuals of O. chuangae sp. nov. were observed on vegetation during the day ( Figs. 53– 54 ; H.-F. Lu, personal communication).