Scirtes humeralis Pic, 1932

Ruta, Rafał & Kiałka, Agata, 2021, The genus Scirtes Illiger of Fiji (Coleoptera: Scirtoidea: Scirtidae), Zootaxa 4926 (4), pp. 501-520 : 510-512

publication ID

https://doi.org/ 10.11646/zootaxa.4926.4.2

publication LSID

lsid:zoobank.org:pub:4CCDB7A9-23F6-4A08-B1D0-0C9131608A9B

DOI

https://doi.org/10.5281/zenodo.4546155

persistent identifier

https://treatment.plazi.org/id/196C87E6-FFE2-3068-D5CC-78B7BAB90F4D

treatment provided by

Plazi

scientific name

Scirtes humeralis Pic, 1932
status

 

Scirtes humeralis Pic, 1932

( Figs 1 View FIGURE 1 E–F, 2B, 6C–D, 7)

Scirtes humeralis Pic, 1932: 210 (locus typicus: Taveuni, Waiyevo)

Type material. Lectotype, here designated, female ( NHM): “ FIJI IS. / Taveuni. / nr. Waiyevo. / 1000 ft. / 9.III.24. / Dr. H. S. Evans / 886.24” [printed & handwritten], “Pres. by / Imp. Inst. Ent. / Brit. Mus. / 1932-295.” [printed], “ Scirtes / humeralis / nsp” [handwritten by Pic] ( Fig. 2B View FIGURE 2 ); paralectotype, here designated, female ( MNHN): “ FIJI IS. / Taveuni / nr Waiyewo. / 1000 ft / 9.III.24 / Dr. H. S. Evans” [handwritten & printed], “voisin de / narovensis / Chp” [handwritten by Pic], “ S. humeralis / n sp” [handwritten by Pic].

Additional material studied. 1 female ( BPBM): FIJI: Viti Levu , Vuda Prov., 1.5 km SW Vaturu Dam, 550m, 14.VII.–26.VII.2004, Malaise trap: M01, E.I. Schlinger, A. Namaqa, -17.744, 177.676, FBA_221466 GoogleMaps ; 1 female ( BPBM): same data as above but inventory number FBA_221472 GoogleMaps ; 1 female ( BPBM): FIJI: Vanua Levu , Macuata Prov., 0.6km S. Rokosalase Village, 150m, 26.III.–9.IV.2004. Malaise Trap: M04, -16.533, 179.018, E.I. Schlinger. M. Tokotaa, FBA201056 GoogleMaps ; 1 female ( BPBM): same data as above but inventory number FBA201057 GoogleMaps ; 1 male ( BPBM): FIJI: Viti Levu , Naitasiri Prov., 4 km WSW Colo-i-Suva Village, Mt. Nakobalevu, 372m, 14.XI.–24.XII.2003, Malaise trap: M03, E. I. Schlinger, Timoci, -18.055, 178.424, FBA_221572 GoogleMaps ; 1 female ( BPBM): FIJI: Viti Levu , Naitasiri Prov., 2km E Navai, old trail to Mt. Tomaniivi, -17.521, 178, 700m, 24.XI.–9.XII.2003, Malaise: M03, E. I. Schlinger. M. Tokotaa. FBA204475 ; 3 females ( BPBM): same data as above but inventory numbers FBA204477, FBA204478, FBA204479 ; 1 male ( BPBM): FIJI: Viti Levu , Naitasiri Prov., 3.2 km E Navai Village, Veilaselase track, 1020m, 20.XII.2003 – 7.I.2004, Malaise trap: M01, E. Namatalau, -17.624, 178.009, FBA_216857 GoogleMaps ; 5 females ( BPBM): same data as above but inventory numbers FBA201818, FBA201815, FBA201816, FBA201819, FBA_ 216858 GoogleMaps .

Diagnosis. Contrasting coloration of dorsum with brown elytra and yellowish head and pronotum allow us easy identification of fully pigmented specimens. Uniformly brown, not fully pigmented specimens, can be identified on the basis of male genital characters: tegmen with very wide, subtriangular parameres.

Redescription. Lectotype, female. Body oval, convex, covered with brown setae, which are easily broken and missing on greater part of dorsum. Head, pronotum and scutellar shield yellowish, elytra brown with yellowish suture and humeral region. Antennomeres 1–3 yellow, remaining dark brown, legs brownish.

Head of moderate size, convex dorsally, shiny, covered with sparse and subtle punctures, separated by ca. 1.5–2.0 diameters. Eyes big, moderately protuberant; head 1.6× wider than interocular space. Antennae filiform, reaching basal 1/3 of elytra. Pronotum slightly convex, covered with sparse punctures, punctures separated by ca. 0.5–1.5 diameter, antero-lateral angles slightly projecting anteriorly, obtuse; lateral margins subtly rounded; postero-lateral angles almost right-angled; base of pronotum bisinuate, margination along basal margin well developed. Scutellar shield covered with shallow punctures, equilaterally triangular. Angle between pronotum and elytra not marked in dorsal outline. Elytra broadly oval, without traces of longitudinal ridges, widest in the middle, punctation stronger than on pronotum, distance between punctures ca. 1.0 diameter; humeri well marked. Hind tibial spurs well developed, dorsal spur curved, ca. 0.7× length of tarsomere 1, ventral spur slightly curved, slightly longer than 0.3× length of longer spur.

Ovipositor long (L 2.25 mm); prehensor formed by a folded lamina (L 0.42 mm, W 0.26 mm) surrounding bursa copulatrix; bursal sclerite absent, group of spines present in proximity of opening of accessory gland ( Fig. 7B View FIGURE 7 , arrow).

Male. Sternite VIII (L 0.10 mm, W 0.27 mm) transversely U-shaped. Sternite IX (L 0.28 mm, W 0.24 mm) V-shaped, with setae on apical margin. Tergite VIII (L 0.52 mm, W 0.48 mm) with transversely trapezoidal apical plate, apical margin covered with row of setae, apodemes a bit longer than apical plate; tergite IX (L 0.37 mm, W 0.33 mm) with short and strongly transverse apical plate, apodemes ca. 1.5× longer than apical plate. Aedeagus asymmetrical. Tegmen (L 0.67 mm, W 0.30 mm) large, Y-shaped, with wide, subtriangular parameres, apices rounded ( Fig. 6C View FIGURE 6 ). Penis (L 0.60 mm, W 0.12 mm) with narrow and elongate pala, apical processes short, hooked and pointed on apices ( Fig. 6D View FIGURE 6 ).

Variability. TL is highly variable, both in male & females, and ranges from 2.2 mm to 3.3 mm. Coloration is brownish in not fully pigmented adults. Prehensor is quite variable in the studied specimens ( Figs 7B, 7E View FIGURE 7 ).

Measurements and ratios. Males (n=2): TL 2.20–3.15 mm (2.68 mm), EL 1.65–2.80 mm (2.23 mm), PL 0.40– 0.55 mm (0.48 mm), EW 1.65–2.30 mm (1.98 mm), PW 1.10–1.55 mm (1.33 mm), TL/EW 1.33–1.37 (1.35), PW/ PL 2.75–2.82 (2.78), EL/EW 1.00–1.22 (1.11), EL/PL 4.13–5.09 (4.61), EW/PW 1.48–1.50 (1.49); females (n=8): TL 2.50–3.30 mm (2.88 mm), EL 2.15–2.85 mm (2.52 mm), PL 0.45–0.57 mm (0.49 mm), EW 1.95–2.30 mm (2.14 mm), PW 1.10–1.60 mm (1.40 mm), TL/EW 1.19–1.44 (1.33), PW/PL 2.20–3.33 (2.51), EL/EW 1.02–1.25 (1.15), EL/PL 4.30–6.11 (4.70), EW/PW 1.44–1.77 (1.64).

Distribution. Known from Viti Levu, and Taveuni Islands ( Fig. 9A View FIGURE 9 ).

MNHN

Museum National d'Histoire Naturelle

BPBM

Bishop Museum

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Scirtidae

Genus

Scirtes

Loc

Scirtes humeralis Pic, 1932

Ruta, Rafał & Kiałka, Agata 2021
2021
Loc

Scirtes humeralis

Pic, M. 1932: 210
1932
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