Lalagetes subfasciatus Boheman, 1842

Borovec, Roman & Skuhrovec, Jiří, 2018, Revision of the species related to Lalagetes subfasciatus Boheman and transfer of remaining Lalagetes species to other genera of Embrithini (Coleoptera: Curculionidae: Entiminae), Zootaxa 4374 (1), pp. 71-90 : 85-86

Lalagetes subfasciatus Boheman, 1842

( Figs 3D , 9A–F )

Lalagetes subfasciatus Boheman, 1842: 125 (original description).

Lalagetes subfasciatus: Lona 1937: 357 (catalogue); Alonso-Zarazaga & Lyal 1999: 172 (catalogue).

Type locality. Caput Bonae Spei [South Africa, probably Western Cape, Cape Peninsula].

Type material examined. Lectotype (here designated), 1 spec. ( NHRS): ‘ Typus [red, p] / Cap. b. sp. [Caput Bonae Spei] Drége [hw] / NRM Sthlm Loan 2758/08 [green, p] / LECTOTYPUS Lalagetes subfasciatus Boheman, R. Borovec & J. Skuhrovec desig. 2017’ [red, p].

Additional material examined. 8 spec., ‘ZA [ South Africa]: E [ Eastern ] Cape—Seymour, Katrivierdam, 32°34′03″S, 26°44′78″E, 780 m, 12.XI.2006, E. Colonnelli lgt.’ ( ECRI) ; 3 spec., ‘ZA [ South Africa]: E [Eastern] Cape, road N 2—25 km W Peddie , 33°16′05″S, 26°55′45″E, 280 m, 7.XI.2006, E. Colonnelli lgt.’ ( ECRI) ; 1 ♀, ‘ South Africa, C. P. [Cape Province, Eastern Cape], Fort Beaufort , 32°46′S, 26°38′E, 1.xii.1983, collected on Grewia occidentalis, R. Oberprieler lgt.’ ( SANC) ; 1 ♂, ‘[ South Africa], CP [Cape Province, Eastern Cape], Fort Beaufort , November 1952, H. K. Munro lgt.’ ( SANC) .

Redescription ( Figs 3D , 9A–F ). Body length males 1.88–1.97 mm, females 2.25–2.91 mm, lectotype 2.91 mm. Body ( Fig. 9A ) dark brownish; antennae and legs reddish brown, only antennal clubs, or at least apical half of clubs blackish. Elytra with moderately large, rounded, appressed isolated scales, in males 3–4, in females 4–5 across width of one interval; pronotum and head with rostrum with similar appressed scales, but distinctly depressed in middle. Perpendicularly erect elytral setae in males longer than width of one interval, slender, lancetshaped, pointed apicad, at midlength slightly narrower than diameter of appressed scale, distance between two setae a bit longer length of one seta; in females the same, only shorter, at most as long as width of one interval; scapes with short, inconspicuous setae; outer side of tibiae with somewhat long, semiappressed setae. Body vestiture greyish white, sometimes with weak pearly sheen, from unicoloured specimens to specimens with weakly V-shaped, wide, transverse stripe at inner 4–6 intervals and small spots at posterior declivity and two wide, curved, longitudinal stripes on pronotum from pale to dark brownish scales.

Rostrum ( Figs 9A–C ) in males 1.18–1.27, in females 1.25–1.29 × as wide as long, widest at base, in both sexes at base 1.08–1.15 × as wide as at apex, mainly in males with weakly concave sides. Epifrons moderately wide, at anterior half subparallel-sided, at basal half weakly enlarged posteriad; when cleared of scales, epifrons with slender longitudinal median carina interrupted at middle by deep, distinct, longitudinal fovea, slightly shallowly depressed along carina, densely punctured by longitudinal punctures creating only very narrow edges between them, matt, weakly carinate at lateral edges; vertex densely finely longitudinally striate from anterior border of pronotum to transverse sulcus. Antennal scrobes dorsally narrowly pit-shaped at anterior half.

Antennae ( Fig. 9A ) with scape at apex slightly narrower than club. Segments 1 and 2 very slender, conical; segment 1 1.9–2.0 × as long as wide and 1.3–1.4 × as long as segment 2, which is 1.8–1.9 × as long as wide; segments 3 and 4 1.2 × as long as wide; segments 5 and 6 1.1 × as long as wide; segment 7 isodiametric. Club 1.8– 1.9 × as long as wide.

Pronotum in males 1.53–1.62, in females 1.59–1.63 × as wide as long.

Elytra in males 1.13–1.16, in females 1.11–1.13 × as long as wide; when cleared of scales with striae creating deepend lines.

Legs ( Figs 9A, D ). Tarsal segment 2 1.4 × as wide as long; segment 3 1.2–1.3 × as wide as long and 1.4 × as wide as segment 2; onychium equally long as segment 3.

Male genitalia ( Figs 3D , 9E ). Penis small, distinctly shorter than metatarsus, in ventral view widest at anterior third, in basal two thirds with slightly rounded sides, at apical third subtriangular with slightly concave sides; in lateral view ventral side almost straight, dorsal side distinctly curved, tip slender and elongated. Temones 2.8 × as long as penis.

Female genitalia. Gonocoxites with very small and short styli, about isodiametric, almost indistinct. Sternite VIII ( Fig. 2D ) with apodeme 4.5–4.7 × longer than plate; plate subtriangular, about isodiametric. Spermatheca ( Fig. 9F ) with slender corpus, ramus long and straight, tube-shaped, about 3–4 × longer than wide, longer than nodulus, which is short, curved, with tip subparallel with ramus.

Biology. Unknown, one specimen was collected from Grewia occidentalis (Malvaceae) .

Distribution. South Africa, Eastern Cape ( Fig. 4 ).

Differential diagnosis. Among species with wider epifrons and 7-segmented funicles easily separated by funicle segment 1 distinctly longer than segment 2, scape at apex slightly narrower than club, rostrum in males with concave sides and spermatheca with ramus distinctly longer than nodulus.

Remarks. Boheman (1842) described this species from “Cap. Bonae Spei. Dom. Drège”. The lectotype is pinned, well preserved specimen, only lacking right anterior tibia with tarsus and complete left posterior leg.

Figures

FIGURE 2. Differential characters between genera Glyptosomus, Lalagetes and Phaylomerinthus: G. costipennis Schoenherr, 1847: A—ventrites, female; B—female sternite VIII; L. subfasciatus Boheman, 1842: C—ventrites, female; D—female sternite VIII; P. convergens (Voss, 1962): E—ventrites, female; P. cinereus Boheman, 1842: F—female sternite VIII; Scales bar:0.5 mm (B, D, F).

FIGURE 3. Apex of penis. A—Lalagetes andersoni sp. nov.; B—Lalagetes howdenorum sp. nov.; C—Lalagetes sarkae sp. nov.; D—Lalagetes subfasciatus Boheman, 1842; E—Lalagetes zitae sp.nov. Scales bar: 0.25 mm.

FIGURE 4. Distribution of Lalagetes species in South Africa; Lalagetes andersoni sp. nov. (green round); Lalagetes howdenorum sp. nov. (pink round); Lalagetes sarkae sp. nov. (yellow rounds); Lalagetes seminulum Fåhraeus, 1871 (red round); Lalagetes subfasciatus Boheman, 1842 (blue rounds); Lalagetes zitae sp. nov. (brown rounds).

FIGURE 9. Lalagetes subfasciatus Boheman, 1842. A—habitus, dorsal view, female; B—rostrum, female, dorsal view; C— rostrum, female, lateral view; D—protibia, female; E—aedeagus; F—spermatheca.Scales bars:1 mm (A), 0.5 mm (E) and 0.3 mm (F).