Elaeidobius subvittatus ( Faust, 1898 )

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, European Journal of Taxonomy 684, pp. 1-32 : 9-11

publication ID

https://doi.org/ 10.5852/ejt.2020.684

publication LSID

lsid:zoobank.org:pub:B88F38A8-C3C7-47BA-8F1B-46D9F127F10B

DOI

https://doi.org/10.5281/zenodo.4331376

persistent identifier

https://treatment.plazi.org/id/03ABCE59-FFFE-FF83-BD60-CDAF6A23FB14

treatment provided by

Valdenar

scientific name

Elaeidobius subvittatus ( Faust, 1898 )
status

 

Elaeidobius subvittatus ( Faust, 1898)

Figs 1C View Fig , 2C View Fig , 4C View Fig , 5 View Fig A–B, E, G, M, 7

Derelomus subvittatus Faust, 1898: 224 .

Derelomus maynei Hustache, 1924: 75 [syn. by Marshall 1930: 575].

Derelomus elaeisae Bondar, 1942: 461 [syn. by Kuschel 1955: 310].

Elaedobius subvittatus – Kuschel, 1955: 310.

Material examined

Holotype

DEMOCRATIC REPUBLIC OF CONGO • “ Landana. Congo. Oberthur” “ subvittatus Fst. ” “Coll. J. Faust. Aukauf 1900” “ type ” “Staatl. Museum für. Tierkunde Dresden” “ Holotype ♀. Derelomus subvittatus Faust, 1898 . Kuschel 2013” “ Elaeidobius subvittatus ( Faust, 1898) . Kuschel 2013”; MTD.

Other material

ANGOLA • 10 ♂♂, 13 ♀♀; CE Salazar; 9.16º S, 14.55º E; 14 May 1973; Carvalho leg.; oil palm inflorescence; TMP GoogleMaps .

CAMEROON • 1 ♂; Bertoua , Bindzia; 15 Mar. 2019; J. Haran leg.; JHAR02229_0101; CBGP .

DEMOCRATIC REPUBLIC OF CONGO • 1 ♂, lectotype of Derelomus maynei Hustache, 1924 [here designated], labelled as “ Elaeidobius . subvittatus ( Faust 1898) . Kuschel 2009”; Yambata; 10 Dec. 1912; R Mayné leg.; MRAC 2 ♀♀, paralectotypes of Derelomus . maynei Hustache, 1924 ; same collection data as for preceding; MRAC 1 ♂; Haut-Uelé, Moto ; 1922; L. Burgeon leg.; MRAC • 1 ♀; Mbwasa; 30 Nov. 1912; MRAC 4 specs, sex not determined; same collection data as for preceding; IRSNB .

TOGO • 1 ♂; Toné; 2015; JHAR00275_0101 ; CBGP.

Diagnosis (♂ ♀)

BODY LENGTH. 1.4–2.2 mm.

COLOUR. Variable in colour, partly or entirely yellowish or dark brown, on more western populations usually with a pair of abbreviated dark stripes on prothorax, and a stripe on interstriae 4–5, with a slightly darkened suture; on eastern specimens prevailing darker colour, especially with prothorax usually becoming more extensively or entirely dark, and markings on elytra vaguer or obliterated.

HEAD. Forehead slightly impressed. Rostrum in male as long as prothorax, in female 1.2 to 1.3 × as long as prothorax, with small postmental tubercle in male visible in lateral view.

PROTHORAX. Disc lacking impressions; carina interrupted or not at collar, with small cuticular expansion, in lateral view gently curved upwards towards apex.

ELYTRA. Interstriae with a distinctive row of elongate hairs on middle, hairs as long as width of interstriae; striae with a row of very short recumbent hairs; prosternum in male large and trilobed, or rudimentary and reduced to a cuticular elevation, sometimes absent.

ABDOMEN. Ventrites 1–2 medially flattened, 5 gently rounded at apex. Tergites 1–6 medially divided; tergite 7 in males truncate; plectral pegs 4 on pale line.

GENITALIA. Penis as long as last three ventrites plus ¼ of ventrite 2; body 3 × as long as apodemes, about 4 × as long as wide (ratio w/l: 0.24), slightly asymmetrical, tilted to the right ( Fig. 4C View Fig ); internal sac without an obvious sclerite.

Life history

Elaeis guineensis (Arecaceae) the oil palm, on inflorescences ( Mariau & Genty 1988).

Distribution

Angola (Landana); Benin (Cotonou, Dassa, Niaouli, Pobè); Cameroon (Bota, Edu Ngat, Likomba, Moliwe, Tiko); Democratic Republic of Congo (Haut-Lopori, Yambula); Gabon (Kome estate, Bokové); Ghana (Kwae); Ivory Coast (Banoua, Boudoukal); Nigeria (Obaretin); Senegal (Malika – Dakar); Sierra Leone (Njala); Togo (Toné). Introduced populations: Brazil (Bahía); Colombia (Campo Alegre); French Guiana (Kourou).

Remarks

Elaeidobius subvittatus is readily distinguished from all other species by its smaller size, and in males by a small tubercle on the underside at the rostrum apex. The populations of South America were introduced accidentally. This taxon was described on a single female from Landana. In the collection of J. Faust housed at MTD, we found this specimen bearing a red “type” label with the identification “ subvittatus Fst. ”, “Landana, Congo ”. This specimen is the holotype of Derelomus subvittatus Faust, 1898 and was labelled accordingly.

Derelomus maynei Hustache, 1924 , was described from three specimens (1 ♂, 2 ♀♀) from Yambata, 10 Dec. 1912 ( Democratic Republic of Congo). This species was then put in synonymy with D. subvittatus (= Elaeidobius subvittatus Faust ) by Marshall (1930). The three syntypes of D. maynei were located in MRAC. The male is designated here as the lectotype of this species and the two females are labelled as paralectotypes.

Species-group plagiatus

Diagnosis

Characterised by larger size and slender body. Prosternum in male never armed with a protruding process. Pronotum with depressions and fold on anterior half and fovea on middle of disc on either side of midline. Lateral carina of prothorax regular, not forming a constriction or indentation near collar ( Fig. 5C View Fig ). Five species in this group.

MTD

Germany, Dresden, Museum fuer Tierkunde

MRAC

Belgium, Tervuren, Musee Royal de l'Afrique Centrale

IRSNB

Belgium, Brussels, Institut Royal des Sciences Naturelles de Belgique

MTD

Museum of Zoology Senckenberg Dresden

TMP

Transvaal Museum

MRAC

Musée Royal de l’Afrique Centrale

IRSNB

Institut Royal des Sciences Naturelles de Belgique

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Curculionidae

Genus

Elaeidobius

Loc

Elaeidobius subvittatus ( Faust, 1898 )

Haran, Julien M., Beaudoin-Ollivier, Laurence, Benoit, Laure & Kuschel, Guillermo 2020
2020
Loc

Elaedobius subvittatus

Kuschel G. 1955: 310
1955
Loc

Derelomus elaeisae

Kuschel G. 1955: 310
Bondar G. 1942: 461
1942
Loc

Derelomus maynei

Marshall G. A. K. 1930: 575
Hustache A. 1924: 75
1924
Loc

Derelomus subvittatus

Faust J. 1898: 224
1898
GBIF Dataset (for parent article) Darwin Core Archive (for parent article) View in SIBiLS Plain XML RDF