Derelomus costalis Fåhraeus, 1844: 93
Hesse , 1929: 530
Ebenacobius Haran, a new southern African genus of flower weevils (Coleoptera: Curculioninae: Derelomini) associated with dicotyledonous plants
Haran, Julien
Benoit, Laure
Procheş, Şerban
Kergoat, Gael J.
European Journal of Taxonomy
2022
2022-05-05
818
1
1
54
(Fahraeus, 1844)
Haran & Benoit & Procheş & Kergoat
2022
Fahraeus
1844
[453,912,888,915]
Insecta
Curculionidae
Ebenacobius
Animalia
Coleoptera
22
23
Arthropoda
species
costalis
gen. et comb. nov.
Figs 1E, I, 2E, 4I, 6E
Derelomus costalis Fåhraeus, 1844: 93. Derelomus rugosicollis Hesse, 1929: 530. Syn. nov.
Differential diagnosis Ebenacobius costalis gen. et comb. nov.can be distinguished from other species of the genus by the combination of basal ⅓ of first stria with a single row of at least slightly misaligned punctures ( Fig. 1E) and by the rostrum moderately downcurved and only slightly longer than prothorax (1.1 ×) in lateral view ( Fig. 4I).
Type material Lectotypeof Derelomus costalis Fåhraeus, 1844(here designated) REPUBLIC OF SOUTH AFRICA• “ ♂” “ Cap. B. Spei.[ REPUBLIC OF SOUTH AFRICA, Western Cape Province]” “Drege” “3758. E91+” “Lectotype ♂; Derelomus. costalis; Fåhraeus, 1844; Haran Des. 2022” “ Ebenacobius; costalis; ( Fåhraeus, 1844); Haran 2022”; NHRS. Lectotypeof Derelomus rugosicollis Hesse, 1929(here designated) REPUBLIC OF SOUTH AFRICA• 1 ♂; “ Mfongosi; Zululand[REPUBLIC OF SOUTH AFRICA, KwaZulu-Natal Province]” “Zululand; Mfongosi; Apr 1923; W E Jones” “ Derelomus; rugosicollis; Types Hesse” “Type [red label]” “Type; SAM/Ent; 4037 [red label]” “Lectotype ♂; Derelomus; rugosicollis; Hesse, 1929; Haran Des. 2022” “ Ebenacobius; costalis; ( Fåhraeus, 1844); Haran 2022”; SAMC. Paralectotypeof Derelomus costalis Fåhraeus, 1844 REPUBLIC OF SOUTH AFRICA• 1 ♀; same collection data as for lectotype of Derelomus rugosicollisexcluding red type label; “Paralectotype ♀; Derelomus; rugosicollis; Hesse, 1929; Haran Des. 2022” “ Ebenacobius; costalis; ( Fåhraeus, 1844); Haran 2022”; SAMC. Other material examined REPUBLIC OF SOUTH AFRICA– Eastern Cape Province• 1 ♀; Kirkwood; 33°22′48.0″ S, 25°27′36.0″ E; 15 Jul. 2019; J. Haranleg.; on yellow Asteraceae; JHAR02390_0101; CBGP • 1 ♂, 1 ♀; Alexandria Forest Station; 33°43′ S, 26°23′ E; 3 Dec. 1987; Endrödy-Youngaleg.; general collection; E-Y: 2549; TMSA • 1 ♀; Little Karoo, Baviaanskloof; 33°39′ S, 24°31′ E; 6 Dec. 1995; C.L. Bellamyleg.; beating; E-Y: 3172; TMSA. – Kwazulu-Natal Province• 2 ♂♂; Pongolapoort; 27°25′15.7″ S, 31°55′10.3″ E; Oct. 2009; Ş. Procheşleg.; on Schotia brachypetala(Fabaceae); JHAR04161-62; CBGP. – Western Cape Province• 1 ♀; Plettenberg Bay; 34°03′ S, 23°23′ E; 13 Feb. 1990; V.M. Uysleg.; SANC • 4 ♀♀; CT [ Cape Town]; Nov. 1900; CleDouxleg.; acc67769; USNM.
Redescription Male BODY LENGTH. 3.0– 3.2 mm. COLOUR. Body integument pale brown, head reddish-brown, prothorax with two large dark-brown areas on each side on the median line, elytra generally with a dense network of transverse dark shades on basal ⅔, sometimes reduced to transverse band on apical ⅔ or absent; dorsum (prothorax + elytra) with minute recumbent setae, not contiguous. HEAD. Rostrum 1.1 × longer than prothorax in lateral view, moderately downcurved, slightly more near base; underside with row of setae, almost as long as 2 ndsegment of funicle, integument forming small tubercle before apex; in dorsal view covered with recumbent non-contiguous setae; antennae inserted at ⅔ of length; head capsule coarsely punctate in dorsal view, with non-contiguous setae, setae slightly longer near dorsal margin on eyes; eyes convex, exceeding the lateral curve of head capsule in dorsal view; antennal funicle with segment 1 elongate, 1.5 × longer than wide, as long as 2–4, 3–7 wider than long. PROTHORAX. Wider than long (W:L ratio: 1.3), widest near base, narrower there than elytra at humeral angles; sides subparallel in basal ¾, slightly and regularly converging apicad; apical constriction as long as width of funicle at apex; integument densely punctate, space between punctures smooth and shiny, narrower than or equal to diameter of punctures; setae in each puncture very short, recumbent, not exceeding in length the diameter of punctures; prosternal process reduced forming a small tubercle between the procoxae. ELYTRA. Sides slightly convex, widest near middle of length (W:L ratio: 0.68); humeri raised; apex jointly rounded; striae made of one row of more or less misaligned punctures, at least misaligned on basal ⅓ of stria 1, narrower than interstriae; interstriae flat, 1-3-5 convex apically, 9 entirely convex; scutellar shield rounded, glabrous. ABDOMEN. Underside covered with small non-contiguous whitish setae. LEGS. Profemora strongly thickened near middle of length; protibiae with external margin straight, meso- and metatibiae curved outward in apical half; tibiae armed with small apical mucro; claws simple. TERMINALIA. Body of penis elongate (W:L ratio: 0.32), as long as apodemes, sides slightly bisinuate in dorsal view, widest near apical ⅓, rounded and converging in apical ⅓, apex acuminate; in lateral view curvature stronger in basal ⅓, almost straight in apical ⅔, width slightly expanding apicad in basal ⅔ ( Fig. 6E). Sexual dimorphism Females can be distinguished from males by their rostrum which is narrower and distinctly longer, 1.3 × longer than prothorax in lateral view ( 1.1 in ♂♂).
Remarks In the collection housed at NHRS, a male specimen with the labels “Cap. B. Spei.” and “Drège” and corresponding to the description of Derelomus costalisin all respects was located. This specimen is the unique individual available and the description does not refer to a specific holotype, it is therefore here designated as the lectotypeof Derelomus costalis Fåhraeus, 1844and was labeled accordingly. In the collections housed at SAMC, a male specimen with the labels “Mfongosi; Zululand” and “ Derelomus; rugosicollis; Types; Hesse [hand written]” was identified. The description only refers to an undetermined number of males and females forming the type series. In the absence of a specific holotypedesignated for this species, the male specimen reported above is here designated as the lectotypefor Derelomus rugosicollis Hesse, 1929and was labeled accordingly.A detailed examination of the external and internal morphology of this specimen revealed no differences with the lectotypeof Derelomus costalis.The name Derelomus rugosicollisis therefore a junior synonym of Derelomus costalis. It should be noted that the lectotypesof both D. costalisand D. rugosicollisare young ill-sclerotized specimens and that their uniformly pale colour is not representative of the colour pattern of the species. A redescription of this species is provided to account for the patterns found on fully sclerotized specimens of this species. In some specimens from the western Capeand Kwazulu-NatalProvinces of the Republic of South Africa, striae 9 are not erased in basal 1/6, but subcontiguous or merged with striae of 10. Fig. 4. A–J. Habitus of males of EbenacobiusHaran gen. nov.in lateral view (part 1). A. E. curvisetisHaran gen. et sp. nov. B. E. thoracicusHaran gen. et sp. nov. C. E. rectirostrisHaran gen. et sp. nov. D. E. xhosaHaran gen. et sp. nov. E. E. duplicatusHaran gen. et sp. nov. F. E. sanHaran gen. et sp. nov. G. E. grobbelaaraeHaran gen. et sp. nov. H. E. kuscheliHaran gen. et sp. nov. I. E. costalis( Fåhraeus, 1844) gen. et comb. nov. J. E. mulanjensisHaran gen. et sp. nov.A–J = not to scale. Life history The host plant of E. costalis gen. et comb. nov.is unknown, adults have been sporadically collected on flowers of Asteraceaeand Fabaceae, which are probably only used as shelters by this species. Adults were collected in February, July, October, November and December.
Distribution Republic of South Africa( Eastern Cape, Kwazulu-Nataland Western CapeProvinces).
3765338338
NHRS
South Africa
Cap. B. Spei.
22
23
1
1
Western Cape Province
lectotype
3765338384
1923-04
SAMC
W E Jones
South Africa
Zululand
Mfongosi
22
23
1
1
KwaZulu-Natal Province
lectotype
3765338331
1923-04
SAMC
W E Jones
South Africa
REPUBLIC OF SOUTH AFRICA
Mfongosi
22
23
1
1
1
KwaZulu-Natal Province
paralectotype
3765338394
on yellow Asteraceae
2019-07-15
CBGP
J. Haran
South Africa
-33.379997
Kirkwood
1
25.460001
Kirkwood
22
23
JHAR02390_0101
1
1
Eastern Cape Province
3765338340
1987-12-03
TMSA
Endrody-Younga
South Africa
23
24
-33.716667
Alexandria Forest Station
1203
26.383333
22
23
2
1
1
3765338418
1995-12-06
beating
TMSA
C. L. Bellamy
South Africa
-33.65
Little Karoo
1204
24.516666
23
24
1
1
Eastern Cape
3765338408
on Schotia brachypetala (Fabaceae)
2009-10
CBGP
S. Proches
South Africa
-27.421026
Pongolapoort
1
31.919527
Pongolapoort
23
24
JHAR04161-62
2
2
Kwazulu-Natal Province
3765338410
1990-02-13
SANC
V. M. Uys
South Africa
-34.05
Plettenberg Bay
1201
23.383333
23
24
1
1
Western Cape Province
3765338390
[275,1116,405,432]
1900-11
USNM
CleDoux
South Africa
Cape Town
Cape Town
23
24
4
4
Western Cape