Ebenacobius duplicatus Haran, 2022

Haran, Julien, Benoit, Laure, Procheş, Şerban & Kergoat, Gael J., 2022, Ebenacobius Haran, a new southern African genus of flower weevils (Coleoptera: Curculioninae: Derelomini) associated with dicotyledonous plants, European Journal of Taxonomy 818 (1), pp. 1-54 : 19-20

Ebenacobius duplicatus Haran gen. et sp. nov.

urn:lsid:zoobank.org:act:ADCA7273-EAD1-4701-A4BD-3C76BAA93182

Figs 2C , 4E , 6C

Differential diagnosis

Ebenacobius duplicatus Haran gen. et sp. nov. can be distinguished from other species of the genus by the distinct two rows of more or less well aligned punctures on elytral striae 1 to 8. Some specimens of E. costalis gen. et comb. nov. have irregular striae ( Fig. 1E ), but they never form two rows throughout the length of the striae.

Etymology

This species is named in reference to its peculiar striae, forming two parallel rows of punctures.

Type material

Holotype REPUBLIC OF SOUTH AFRICA • ♂; “S. Afr. [REPUBLIC OF SOUTH AFRICA]; Limpopo Prov. Soutpans, near vivo. 10.1.2009; T. Beyers ” “Holotype; Ebenacobius duplicatus ; Haran 2022”; TMSA.

Paratypes REPUBLIC OF SOUTH AFRICA – Limpopo Province • 1 ♂; Tshipisie, 22°36′ E, 30°10′ S; 11 Dec. 2005; Gussmann and Müller leg.; light trap; E-Y: 3693; TMSA • 1 ♀; Amatola farm , Soutpans ; 22°56′ S, 29°23′ E; 17 Dec. 2003; R. Müller leg.; light trap; E-Y:3600; TMSA . – Mpumalanga Province • 3 ♀♀; Kruger National Park , Skukuza-Sabi River ; 24°57′ S, 31°42′ E; 22 Feb. 1995; Endrödy-Younga leg.; riverinefor-litter; E-Y:3111; TMSA • 1 ♂; Kruger National Park , Shirombe Pan ; 22°44′ S, 31°24′ E; 24 Jan. 1984; M.W. Mansell leg. SANC • 1 ♂; Kruger National Park , Skukuza Research Camp ; 25°00′ S, 31°35′ E; 1–16 Dec. 2010; James Harrison leg.; UV light trap; TMSA • 1 ♂; same collection data as for preceding; CBGP • 3 ♀♀; Kruger National Park , Skukuza Research Camp ; 24°59′54.7″ S 31°35′42.7″ E; 12–14 Dec 1985; S. and J. Peck; thornscrub and riverine lightraps; CMN.

Description

Male

BODY LENGTH. 3.0–4.0 mm.

COLOUR. Body integument brown to pale brown, apical ⅓ on tibiae, temples and rostrum dark brown; prothorax with two longitudinal dark strips on each side of the median line; basal 3/4 of elytra with a dense network of transverse shades; dorsum (prothorax + elytra) with short recumbent whitish setae forming 1–2 rows on each interstria, not concealing the integument.

HEAD. Rostrum as long as prothorax in lateral view, strongly and regularly downcurved; underside with a row of long setae, almost as long as 1 st segment of funicle, integument forming an angle before apex; in dorsal view covered with recumbent setae, more densely condensed basally; antennae inserted near apical ⅓ of length; head capsule coarsely punctate in dorsal view, with a short seta on each puncture, forming more dense tuft near dorsal margin on eyes; eyes slightly convex, moderately exceeding the lateral curve of head capsule in dorsal view; antennal funicle with segment 1 elongate, 2× longer than wide, as long as 2–4, 5–7 wider than long.

PROTHORAX. Variable in shape; slightly wider than long (W:L ratio: 1.16), widest at middle of length or in basal half, as wide as or narrower than elytra at humeral angles; sides slightly rounded or subparallel in basal half; apical constriction as long as width of apex of funicle; basal margin impressed near scutellar shield; integument densely punctate, space between punctures smooth and shiny, narrower than or equal to diameter of punctures; setae recumbent, oriented toward scutellar shield; prosternal process inserted between procoxae, directed anteriorly, truncate at apex.

ELYTRA. Sides subparallel in basal half, widest near middle of length (W:L ratio: 0.75); humeri raised; apex jointly rounded; striae made of two subparallel rows of punctures, wider than interstriae, interstriae convex, 9 forming a carina; scutellar shield rounded, glabrous.

ABDOMEN. Underside covered with small non-contiguous whitish setae.

LEGS. Profemora moderately thickened near middle of length; protibiae with external margin straight, meso and meta tibiae curved outward in apical half; tibiae armed with a small apical mucro; claws simple.

TERMINALIA. Body of penis elongate (W:L ratio: 0.38), slightly shorter that apodemes, widest at base, sides subparallel, narrowing in apical 1/5, apex acuminate; in lateral view curvature strong in basal half, straight in apical half, widening from base to apical 1/4, narrowing apicad in apical 1/4 ( Fig. 6C ).

Sexual dimorphism

Females can be distinguished from males by their rostrum which is narrower in dorsal view and less downcurved in lateral view than in ♂♂.

Remarks

The male specimens of this species show substantial variation of size and shape of prothorax,

Life history

The host plant of this species is unknown. Adult specimens were collected in December, January and February in leaf litter or using light traps.

Distribution

Republic of South Africa (Limpopo and Mpumalanga Provinces).

Figures

Fig. 2. A–I. Habitus of males of Ebenacobius Haran gen. nov. in dorsal view (part 1). A. E. curvisetis Haran gen. et sp. nov. B. E. rectirostris Haran gen. et sp. nov. C. E. duplicatus Haran gen. et sp. nov. D. E. grobbelaarae Haran gen. et sp. nov. E. E. costalis (Fåhraeus, 1844) gen. et comb. nov. F. E. thoracicus Haran gen. et sp. nov. G. E. xhosa Haran gen. et sp. nov. H. E. san Haran gen. et sp. nov. I. E. kuscheli Haran gen. et sp. nov. Scale bars = 1 mm.

Fig. 4. A–J. Habitus of males of Ebenacobius Haran gen. nov. in lateral view (part 1). A. E. curvisetis Haran gen. et sp. nov. B. E. thoracicus Haran gen. et sp. nov. C. E. rectirostris Haran gen. et sp. nov. D. E. xhosa Haran gen. et sp. nov. E. E. duplicatus Haran gen. et sp. nov. F. E. san Haran gen. et sp. nov. G. E. grobbelaarae Haran gen. et sp. nov. H. E. kuscheli Haran gen. et sp. nov. I. E. costalis (Fåhraeus, 1844) gen. et comb. nov. J. E. mulanjensis Haran gen. et sp. nov. A–J = not to scale.

Fig. 6 (part 1). A–I. Male genitalia of Ebenacobius Haran gen. nov., penis in dorsal (left) and lateral (right) view.A. E. curvisetis Haran gen. et sp. nov.B. E. rectirostrisHaran gen. et sp. nov.C. E. duplicatus Haran gen. et sp. nov. D. E. grobbelaarae Haran gen. et sp. nov. E. E. costalis (Fåhraeus, 1844) gen. et comb. nov. F. E. thoracicus Haran gen. et sp. nov. G. E. xhosa Haran gen. et sp. nov. H. E. san Haran gen. et sp. nov. I. E. kuscheli Haran gen. et sp. nov. A–I = not to scale.

Fig. 1(see preceding page). A–M. Details of morphology and measurements of Ebenacobius Haran gen. nov. and Derelomus Schoenherr, 1825. A. Ebenacobius rhodesianus (Hesse, 1929) gen. et comb. nov. in dorsal view, with the white arrows showing where the measurements of width (w) and length (L) are made for the prothorax (top) and elytra (bottom). Black arrow showing the narrowing of prothorax near apical margin. B. Head in lateral view of E. rhodesianus with white arrow showing the groove on forehead and the black arrow showing the convexity of the eyes, exceeding the lateral curve of head. C. Head and apex of prothorax in dorsal view of Derelomus chamaeropsis Fabricius, 1798 with the white arrow showing flat forehead, lacking groove and black arrow showing the constriction on the prothorax near apical margin. D. Detail of the top-left part of the right elytron in E. rhodesianus showing the white scales on interstriae and with the well aligned punctures at base of stria 1 highlighted in white. E. Detail of the top-left part of the right elytron in E. costalis (Fåhraeus, 1844) gen. et comb. nov. showing the setae on interstriae and with the misaligned punctures at base of stria 1 highlighted in white. F. Protibia of males of E. rhodesianus, showing the apical acute mucro and the ante-apical brush of setae. G. Head and prothorax of E. rhodesianus in lateral view with the arrows showing where measurements of rostrum and prothorax length are made. H. Right maxilla of E. rhodesianus in dorsal view. I. Penis of E. costalis in dorsal view showing were measurements are made for the body of penis (white arrows: width; top right black arrows: length) and the length of apodemes (bottom right black arrows).J. Stridulatory plate (tergite VII) in male of E. rhodesianus in dorsal view, with the cuticular tubercles used for stridulation highlighted in white. K–M. Female genitalia. K. Ovipositor in E. rhodesianus. L. Sternite VIII, same species. M. Spermatheca, same species. N. Right mandible, same species. O. Labial prementum, same species. A–O: not to scale.