Elaeidobius singularis Haran & Beaudoin-Ollivier & Benoit & Kuschel 2020, comb. nov.
Creators: name: Haran, Julien M.
name: Beaudoin-Ollivier, Laurence
name: Benoit, Laure
name: Kuschel, Guillermo
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Curculionidae
Elaeidobius
Elaeidobius singularis

description: Elaeidobius singularis (Faust, 1898) comb. nov.
Figs. 1H, 3D, 4H, 5H
Derelomus singularis Faust, 1898: 224.
Derelomus uelensis Hustache, 1932: 68. syn. nov.
Material examined
Lectotype (here designated)
DEMOCRATIC REPUBLIC OF CONGO • ♂; “ Landana. Congo. Oberthur” “ D singularis Fst. ” “Coll. J. Faust. Ankauf 1900” “type” “Staatl. Museum für. Tierkunde Dresden” “ Lectotype ♂ [here designated]. Derelomus singularis Faust, 1898. Kuschel 2013” “ Elaeidobius singularis (Faust, 1898). Kuschel 2013”; MTD.
Paralectotype (here designated)
DEMOCRATIC REPUBLIC OF CONGO • 1 ♀; same collection data as for lectotype; “ Paralectotype ♀. Derelomus singularis Faust, 1898. Kuschel 2013” “ Elaeidobius singularis (Faust, 1898). Kuschel 2013”; MTD.
Other material
DEMOCRATIC REPUBLIC OF CONGO • ♂, lectotype of Derelomus uelensis Hustache, 1932 [here designated], labelled as “ Elaeidobius singularis (Faust 1898) Kuschel 2009 ”; Haut-Uelé, Moto; 1922; L. Burgeon; MRAC • 3 ♂♂, 2 ♀♀; Kindu; Nov. 1913; L. Burgeon leg.; MRAC • 1 ♀; Haut-Loporiv; 1927; J. Ghesquiere leg.; MRAC • 1 ♀; Haut-Uelé, Watsa; 1922; L. Burgeon leg.; MRAC.
ANGOLA • 2 ♂♂; CE Salazar; 9.16º S, 14.55º E; 14 May 1973; Carvalho leg.; oil palm inflorescence; TMP.
GHANA • 1 ♂; Godbe; 2015; on inflorescences of E. guineensis; JHAR00283_0101; CBGP.
Diagnosis (♂ ♀)
BODY LENGTH. 2.2–3.0 mm.
COLOUR. Yellowish or reddish brown, shiny rostrum in part, meso and metasternum dark; prothorax with vague, dark stripe on sides of discal foveae, elytra usually dark near basal ¼ of interstria 6 and an oblique band from middle of interstria 3 or 4 to ¾ of interstria 8.
HEAD. Forehead in male impressed. Rostrum in male a fraction shorter than prothorax, without erect hairs or tubercle on underside, in female 1.5 × longer than prothorax.
PROTHORAX. Disc with a pair of large, deep foveae; apical collar at base usually with a transverse row of black dots; lateral carina fine, continued to apex.
ELYTRA. Without long erect setae on margin and suture, in male often with a conspicuous swelling at base of interstria, in small males reduced or absent; prosternum without protruding process.
ABDOMEN. Ventrite 1–2 flattened on middle, not impressed, with fine, appressed pubescence and no semi-erect hairs. Tergites 3–6 undivided on midline, tergite 7 strongly advancing forward against tergite 6; granules of stridulatory organ evenly distributed on entire line, up to 18 in number per row.
GENITALIA. Penis a little longer than the last three ventrites; body 2.3 × as long as apodemes, about 2 × as long as wide (ratio w/l: 0.48), symmetrical, tapering with slight curve to apex (Fig. 4H); internal sac with a pair of small frena.
Life history
In inflorescences of the oil palm, Elaeis guineensis (Arecaceae) (Mariau & Genty 1988).
Distribution
Benin (Cotonou, Dassa, Niaouli, Pob è); Cameroon (Edu Ngat, Ekondo Titi, Kienke, Mbalmayo, Moliwe); Democratic Republic of Congo (Haut-Lopori, Haut Uelé: Moto, Watsa, Kindu, Landana, Luluabourg); Gabon (Kome Estate); Ghana (Gobbe); Ivory Coast (Bonoua, Boudoukal); Nigeria (Obaretin); Togo (Kloto).
Remarks
Elaeidobius singularis is readily distinguished in the male by having a tumescent 4 th interstria at the base (though reduced or even absent at times in some small individuals), and no semi-erect hairs on the abdomen, and by the elytra without long erect setae on the margin and on the suture. This taxon was described on a male and a female from Landana in the current Democratic Republic of Congo. In the collection of J. Faust housed at MTD, we found a male and a female pinned on the same pin with the identification “ D singularis Faust. ” “Landana, Congo ” and bearing a red “type” label. The description of this species does not refer to a holotype, therefore the male syntype was designated as the lectotype of Derelomus singularis Faust, 1898 and was labelled accordingly. The female syntype was labelled as the paralectotype of this species.
Hustache described D. uelensis based on five specimens collected by L. Burgeon in Moto (Democratic Republic of Congo). In the collections of the MRAC, only one specimen from Moto could be located and bore a red paratypus label. This specimen is here designated as the lectotype for D. uelensis and labelled accordingly. The other four specimens of this series are from Kindu and not from Moto as reported by Hustache (1932). These specimens also bear paratypus labels and were labelled as paralectotypes of this species. Observations made on the external and internal morphology of specimens of this series showed no difference from the holotype of Elaeidobius singularis. Consequently, the name Derelomus uelensis should be considered as a junior synonym of Elaeidobius singularis.
description: Published as part of Haran, Julien M., Beaudoin-Ollivier, Laurence, Benoit, Laure & Kuschel, Guillermo, 2020, Revision of the palm-pollinating weevil genus Elaeidobius Kuschel, 1952 (Curculionidae, Curculioninae, Derelomini) with descriptions of two new species, pp. 1-32 in European Journal of Taxonomy 684 on pages 23-24, DOI: 10.5852/ejt.2020.684, http://zenodo.org/record/3959113