Dichorrhinus geiseri, Germann, 2013

Germann, Christoph, 2013, A review of Dichorrhinus Desbrochers, 1875 (Coleoptera, Curculionidae) with two new species from Greece and Turkey, and from Cyprus, European Journal of Taxonomy 46 (46), pp. 1-13 : 3-6

Dichorrhinus geiseri sp. nov.

urn:lsid:zoobank.org:act:0B6748F9-8B14-4690-B641-2DFF11ED3607

Figs 1C, H , 2 A-F, T

Etymology

The new species is dedicated to Michael Geiser (Basel), expert in Prionoceridae and dear colleague. The chance to examine his collection of weevil specimens from Samos-Island initiated the present review.

Type material

Holotype

♂, “ Griechenland SAMOS Limnionas env.[environment] 37°41’N / 26°37’E M. Geiser leg. 23.III.2008 ”// “Macchia, Klopfschirm [beating tray]”. Red label: “Holotype Dichorrhinus geiseri sp. nov. C. Germann des. 2013” ( NMBE).

Paratypes

1 ♀, same data as holotype ( NMB); 9 ♂♂, 3 ♀♀, “ 21.05.2007 SW Turkey, Baba Dagi S Fethiye , leg. P. Białooki ”; 7 ♂♂, 10 ♀♀, “ 19.05.2007 SW Turkey, Baba Dagi SW Denizli, leg. P. Białooki ”; 4 ♂♂, 3 ♀♀, “ 23.05.2010 SW Turkey, Mt. 2421m W Ören, SW Acipayam , leg. P. Białooki ”; 5 ♂♂, 6 ♀♀, “ 25.05.2007 SW Turkey, Ak Dagi W Aglasun , S Isparta , leg. P. Białooki ” ( NMBE, cPB). All 48 paratypes are additionally labelled with red paper: “ Paratype Dichorrhinus geiseri sp. nov. C. Germann des. 2013”.

Description

SIZE. (Without rostrum) males 4.2 mm (3.8-4.7 mm), females 4.7 mm (4.4-5.1 mm).

COLOUR. Body, head and femora dark brown to black; nasal plate, antennae, tips of femora, partly tibiae and all tarsal segments reddish-brown.

HEAD. Eyes strongly convex, protruding, short oval in section. Rostrum about as long as wide, with well separated, glabrous and reddish-brown nasal plate; glossy from rostral dorsum to the scrobes. From there to epistome punctuate-striate. Head and basal half of rostrum with oval, green-metallic scales and long, partly bowed, dark hairs. Antennae reddish brown, apex of scape and club slightly darker. Antennal scape long, bowed and slender, reaching fore margin of pronotum. Apex of scape thickened, three times wider than base. Seven segments of antennal funiculus as follows (L/W): 1: 3.2, 2: 3.5, 3: 2.1, 4 th and 5 th 1.9, 6: 1.4, 7: 1.5. Club fusiform, long and slender.

PRONOTUM. (L/W): 0.7, transverse, widest in the middle, strongly constricted just before fore margin, sides rounded. Densely and irregularly punctuate on disc, vestiture consisting of oval, metallic green scales and long, dark, bowed hairs.

ELYTRA. (L/W) male: 1.9, female: 1.7, parallel-sided. Base much wider than pronotum. Shoulders well pronounced. Striae linear and regularly punctuate, interstriae slightly wider. Vestiture consisting of green-metallic, broad, roundish scales, straight cut at hind margin (nearly triangular), and long, semiraised, dark hairs. Scutellum longer than wide, rounded at tip.

LEGS. All femora strong, with sharp teeth varying in size, tibiae straight. Four visible tarsal segments, 1 st segment 1.4 times longer than 2 nd, 3 rd slightly shorter, about twice as wide, 4 th segment tiny and hardly visible, 5 th reaching as far as 1 st. Claws fused at base, simple.

MALE GENITALIA ( Fig. 2 A-F). Sides of median lobe of aedeagus sinuate, apex with short and blunt (rounded) tip. Apodeme as long as median lobe. Tegmen with short parameres, tegminal apodeme straight, about half as long as apodeme of aedeagus. Ventrite 8 slightly curved, as long as aedeagus.

FEMALE GENITALIA. Ventrite 8 with very long and slender apodeme. Spermatheca with pointed, almost straight nodulus and strongly curved, globular cornu ( Fig. 2T ).

SEXUAL DIMORPHISM. Elytra of male parallel, widest at base, elytra pointed towards apex. Elytra of female widest at last third, rounded towards apex.

Host plants

The new species was collected in the phrygana plant association on Samos Island while beating and sweeping (M. Geiser, written communication), and while collecting in Turkey in steppe habitats mostly at higher altitudes ( Fig. 3 ) (P. Białooki, written communication).

Figures

Fig. 1. A-E. Habitus. F-J. Head and antennal scape of Dichorrhinus spp., ♂. — A, F. D. alziari sp. nov., holotype. — B, G. D. creticus (Faust, 1889). — C, H. D. geiseri sp. nov., holotype. — D, I. D. korbi Schilsky, 1911. — E, J. D. pseudoscythropus Desbrochers, 1875.

Fig. 2. A-F. Ventral view or aedeagus of Dichorrhinus geiseri sp. nov. A. Holotype. B-C. Denizli, Turkey. D-E. Fethyie, Turkey. F. Ören, Turkey. — G-J. Ditto of D. alziari sp. nov. G-I. Potami, Cyprus. J. Holotype. — K-O. Ditto of D. korbi Schilsky, 1911. K-L. Akseki, Turkey. M. Avlanbeli, Turkey. N. Davras, Turkey. O. Tahtali, Turkey. — P, Q. Ditto of D. creticus (Faust, 1889), Crete, Greece. — R-S. Ditto of D. pseudoscythropus Desbrochers, 1875, Sinfeh, Syria. — T-V. Spermatheca. T. D. geiseri sp. nov. U. D. alziari sp. nov. V. D. korbi, holotype.

Fig. 3. Habitat of Dichorrhinus geiseri sp. nov. in May in Ören, Turkey at 2421 m. a. s. l. (photo: P. Białooki).