Tapinomorphus angolanus Borovec & Nakládal, 2020

Borovec, Roman & Nakládal, Oto, 2020, Four new Tapinomorphus Hartmann species from Angola, Zambia and Zimbabwe (Coleoptera: Curculionidae: Entiminae: Sciaphilini), Zootaxa 4838 (1), pp. 128-136 : 129-131

Tapinomorphus angolanus Borovec & Nakládal , sp. nov.

http://zoobank.org/ urn:lsid:zoobank.org:act:7E018BCE-10B0-493C-8419-9E4712C0C140

( Figs 1 , 5–8 )

Type locality. Angola, Bruco .

Type material. Holotype. ♂, ‘ Angola [Namibe], Bruco , 26.ii-2.iii.1972, damp leaf litter by stream’ ( BMNH).

Description. Body length of holotype 2.51 mm. Body brown, basal half of scapes, funicles, apical third of tibiae and tarsi paler, yellowish brown ( Fig. 1 ). Dorsal part of body and femora and tibiae densely covered by oval appressed scales, finely longitudinally striate, leaving narrow spaces with visible integument, 3 scales across the width of one interval. Elytra with one row of conspicuous, subspatulate erect setae, before the rounded tip weakly wider than diameter of one appressed scale, distance between setae separated by 2–3 times length of one seta; pronotum with very short and wide, densely irregularly scattered setae; head with rostrum with longer and slender, sparsely scattered setae; femora and tibiae with short, slender, semiappressed setae; scapes at inner side with long and sparse, erect setae; funicles with fine, semierect, piliform whitish setae; clubs and tibiae with short setae.

Rostrum ( Figs 5, 6 ) slender and moderately long, widest at base, at base 1.12 × as wide as long and 1.17 × as at apex, basal part tapered apicad, then about parallel-sided; laterally distinctly convex, well separated from the head by transverse sulcus and curved down to frons at antennal insertion. Epifrons widest at base, here equally wide as space between inner edge of eyes, distinctly tapered anteriad with concave sides, dorsally flat, posteriorly separated from head by straight transverse sulcus. Frons short and wide, glabrous, posteriorly separated from epifrons by straight but not carinated line. Epistome not developed. Scrobe dorsally visible as very slender furrow along the entire length, weakly curved; laterally weakly enlarged posteriad, curved, with dorsal border directed to ventral border of eye but not reaching it and ventral border directed downward, not reaching lower part of rostrum. Eyes small, convex, weakly prominent from outline of head; laterally very near to dorsal part of head. Head long, behind eyes equally long as diameter of eyes; vertex slightly convex.

Antennae very slender; scape 1.4 × as long as funicle, at apex distinctly more slender than club, very slender in basal two thirds, in apical third evenly weakly enlarged apicad, at apex narrower than club, weakly curved at midlength and at apical third; funicle 5-segmented. Segments 1 and 2 long and slender (1 is enlarged at tip), equally long; segment 1 twice as long as wide and equally long as segment 2, which is 2.7 × as long as wide; segments 3–5 isodiametric, segment 5 slightly larger than previous two; club 1.8 × as long as wide.

Pronotum ( Fig. 1 ) 1.48 × as wide as long, small in relation to elytra, 0.52 × as wide as elytra, narrow, widest in basal third with rounded sides, distinctly more tapered anteriorly then posteriorly, behind anterior border weakly constricted; disc regularly convex; base weakly arched.

Elytra short oval ( Fig. 1 ), 1.09 × as long as wide, widest at midlength with distinctly regularly rounded sides, at apex broadly rounded. Striae under vestiture distinctly roughly punctate, about as wide as intervals; interstriae without tubercles or elevations. Subhumeral bumps weakly developed, visible only in dorso-lateral view.

Abdominal ventrites short and wide ( Fig. 7 ), 1.24 × as wide as long, glabrous, ventrite 1 punctured, the others smooth; ventrite 1 at middle more than twice as long as ventrite 2; ventrite 2 at middle about equal in length to ventrites 3 and 4 combined. Suture between ventrites 1 and 2 straight. Metaventral process obtuse, distinctly wider than transverse diameter of metacoxa.

Femora unarmed. Protibiae with outer edge straight and inner edge distinctly enlarged, apex subtruncate with fringe of short, sparse setae. Metatibiae at inner edge with one distinct, brownish, blunt spine at midlength, distinctly enlarged on inner edge at apex. Tarsal segment 2 1.2 × as wide as long; segment 3 1.3 × as wide as long and 1.3 × as wide as segment 2; onychium slender and long, 1.6 × as long as segment 3. Claws fused in basal half.

Penis ( Fig. 8 ) ventrally parallel-sided, at apical quarter evenly tapered apicad, subtriangular; laterally widest in basal third, curved, evenly tapered apicad.

Derivation of name. Named after the country of Angola.

Biology. The holotype was collected from damp leaf litter.

Differential diagnosis. Tapinomorphus angolanus sp. nov. is easily distinguished from almost all other Tapinomorphus species by antennal funicle 5-segmented, while all other species have funicle 7-segmented. The only exception is T. divergens Voss, 1962 described from Tanzania, which also has funicle 5-segmented but that character was overlooked by Voss in his original description, based on poorly mounted type specimens, and also T. kudrnai Borovec & Nakládal , sp. nov. described below. A key to the three species with 5-segmented funicle is presented below.

Except for its 5-segmented funicle, T. angolanus Borovec & Nakládal , sp. nov. is characterized by pronotum very small in comparison to elytra, moderately slender rostrum and elytra with rows of long subspatulate setae. T. kidundaensis Voss, 1962 also has pronotum very small in comparison to elytra, but T. angolanus Borovec & Nakládal , sp. nov. can be distinguished from that species, described from Tanzania, by absence of humps on elytra (vs. elytra with small longitudinal humps on intervals 3, 5 and 7 in T. kidundaensis ), rostrum slender and long, 1.1 × as wide as long (vs. 1.5 × in T. kidundaensis ) and erect elytral subspatulate setae distinctly enlarged apically (vs. slender, parallel-sided, not enlarged apically in T. kidundaensis ). Elytra without humps and elevated intervals, not conspicuously prominent eyes and elytra with conspicuous rows of long subspatulate setae make T. angolanus sp. nov. similar to T. setipennis Voss, 1962 described from Tanzania. From T. setipennis it is easily distinguishable by rostrum without laterally prominent pterygiae (vs. pterygiae well developed, distinctly prominent laterally in T. setipennis ), pronotum small in comparison to elytra, 0.5 × as wide as elytra (vs. 0.6 × in T. setipennis ) and first two funicle segments equally long (vs. first segment distinctly longer than second in T. setipennis ).

Figures

FIGURES 1–4. Dorsal habitus. 1. Tapinomorphus angolanus sp. nov.; 2. T. kudrnai sp. nov.; 3. T. latipennis sp. nov.; 4. T. verunkae sp. nov.

FIGURES 5–21. Structural details. 5–8. Tapinomorphus angolanus sp. nov. 5. head with rostrum, dorsal view; 6. head with rostrum, lateral view; 7. abdominal ventrites; 8. penis dorsal and lateral view. 9–12. T. kudrnai sp. nov. 9. head with rostrum, dorsal view; 10. head with rostrum, lateral view; 11. female sternite VIII; 12. spermatheca. 13–18. T. latipennis sp. nov. 13. head with rostrum, dorsal view; 14. head with rostrum, lateral view; 15. penis dorsal and lateral view; 16. Spermatheca; 17. female sternite VIII; 18. gonocoxites. 19–21. T. verunkae sp. nov. 19. head with rostrum, dorsal view; 20. head with rostrum, lateral view; 21. spermatheca.