Euops platyrostris, Riedel, 2001

Riedel, Alexander, 2001, The pygmaeus-group of Euops Schoenherr (Coleoptera, Curculionoidea, Attelabidae), weevils associated with Nothofagus in New Guinea, Journal of Natural History 35 (8), pp. 1173-1237 : 1209-1214

publication ID

https://doi.org/ 10.1080/00222930152434481

DOI

https://doi.org/10.5281/zenodo.5279378

persistent identifier

https://treatment.plazi.org/id/5D6A8780-6D36-5276-FE51-5E778FE8FDBC

treatment provided by

Felipe

scientific name

Euops platyrostris
status

sp. nov.

Euops platyrostris sp. n.

(®gures 8, 76, 77, 102, 118, 126, 129±131, 134, 155, 165, 180, 192, 205, 216, 225)

Diagnosis. Elytral humerus with tooth. Colouration golden-bronze. Length of pronotum plus elytron longer than 3.5 mm. Colouration golden-bronze. Elytral striae deeply impressed.

Range. Figure 225. Jayawijaya Prov. (Baliem Valley). Altitude: c. 2800±2950 m.

Type material. HOLOTYE: Irian Jaya : Jayawijaya Prov., Moss forest between Theila and Lake Habbema, 2800±2950 m, 22 October 1993, leg. A. Riedel ( ARC). PARATYPES: two males, one female (marked as`allotype’) , same data as holotype ( ARC) .

Description

Holotype, male. Length, pronotum 1 elytron: 4.55 mm. Colouration. Goldenbronze; legs except tarsi reddish-brown with golden lustre. Head. As in ®gure 76; elongate, with gena 1.43 Ö as long as width of head behind eyes; contours of genae in dorsal view moderately converging anteriad; vertex shining, with few wellimpressed parallel wrinkles curving from posterolaterally mesad to hind margin of eye; vertex laterally densely deeply punctate, medially sparsely punctate with moderately deep punctures; eyes evenly rounded, dorsally distant, separated by c. 0.40 Ö basal width of rostrum; frons with longitudinal wrinkles and deep punctures, anteriorly without distinct median longitudinal impression, centre of frons without median costa; ventrally in front of gular region shining, longitudinally wrinkled, deeply punctate, with median furrow, anteriorly with short median submental carina. Rostrum 2.12 Ö as long as mouthparts, at widest point 1.86 Ö wider than at base; clypeus with median process apically deeply incised; antennal insertion shifted anteriad, at approximately one third of rostral length from base; in lateral aspect with dorsal contour weakly bisinuate, above antennal insertion and at middle of rostral length weakly convex; ventral contour at base continuous with contour of head, concave to hind level of maxillary cavity, sinuate to apex; dorsal and ventral contour basally subparallel, shortly before apex converging; ventral surface with submentum before hind level of maxillary cavities slightly concave, posteriorly sloping dorsad, continued by median submental carina not clearly de®ning postgenal recesses. Antenna as in ®gure 102. Prothorax. Sides sinuate, converging apicad; without preapical constriction; disc shining, with numerous ®ne transverse wrinkles. Elytron. At humerus with tooth, anterior contour in convex line from base of elytron to apex of tooth; 2.53 Ö longer than wide [width measured from apex of tooth]; striae deeply impressed. Thoracic venter. Prepectus c. 3.0 Ö as long as postpectus. Height of pterothorax 0.62 Ö length of elytron. Legs. Procoxa anteriorly simple. Femora ventrally with erect setae. Profemur elongate, with ventral surface smooth. Protibia (®gure 118) slender, dorsal and ventral contour parallel, in basal half straight, in apical half strongly curved; ventral surface sparsely denticulate, denticles well-projecting, becoming denser apicad; ventral surface sparsely setose, each denticle adorned with seta; anterior distal comb consisting of thin setae, posterior distal comb vestigial. Mesotibia with posterior surface subapically extended dorsoposteriad beyond crenulate dorsal edge into acute process (®gure 131). Uncus of metatibia stout, weakly tapering apicad, curved hook-like posteriad, at base without accessory tooth (®gures 129, 130). Abdomen. Ventral contour in lateral view strongly concave; venter subglabrous, apically sparsely setose; sternite VII with apex medially pointed; pygidium c. 1.15 Ö wider than long, shining, shallowly punctate, weakly rugulose, sparsely setose, base laterally overlapped by elytral apex. Genitalia. Sternite VIII (®gure 165) with apex bilobed, margins sclerotized, centre hyaline, apically densely setose with long setae. Tegminal plate (®gure 192) with sides subparallel before apex; apex rounded, evenly setose. Aedeagus as in ®gure 134. Apical scoop of pedon (®gure 180) with lateral margins convex, with apex subacute. Endophallus in apical part with pair of narrow sclerites. TA as in ®gure 155.

Allotype, female. Same as holotype except: Length, pronotum1 elytron: 3.80 mm. Head. As in ®gure 77; vertex with shallow punctures, without special sculpture patterns; eyes separated by c. 0.38 Ö basal width of rostrum. Rostrum 1.61 Ö as long as mouthparts, at widest point 1.58 Ö wider than at base; apically more strongly compressed dorsoventrally; in lateral view with dorsal contour at antennal articulation angulate, anteriorly weakly concave to apex; ventral contour convex to apex. Elytron 2.39 Ö longer than wide [width measured from apex of tooth]. Thoracic venter. Prepectus c. 0.5 Ö as long as postpectus. Height of pterothorax 0.68 Ö length of elytron. Legs. Profemur shorter. Protibia (®gure 126) in anterior view with dorsal contour straight except at base, ventral contour almost straight, weakly sinuate, weakly concave at apex, middle, and base; apex of protibia transversely truncate; dorsal edge of mesotibia subapically without process; apex of protibia and mesotibia with uncus and premucro, apex of metatibia with uncus but without premucro; uncus of metatibia curved ventrad. Abdomen. Sternite VII with apex evenly concave; patch of modi®ed setae c. 1.09 Ö as long as wide; sternite VI with simple row of modi®ed setae. Genitalia. Sternite VIII as in ®gure 216. Spermatheca (®gure 205) slender, in basal half microreticulate; with membranous spermathecal gland.

Intraspeci W c variation. Length, pronotum1 elytron: 3.60 ±4.55 mm (n 5 4, xÅ 5 4.01 Ô 0.41). Elytron. 2.39± 2.59 Ö longer than wide (n 5 4, xÅ 5 2.51 Ô 0.09) [width measured from apex of tooth]. Thoracic venter. Height of pterothorax in males 0.62± 0.63 Ö length of elytron (n 5 3, xÅ 5 0.62 Ô 0.01).

Etymological note

This epithet is a combination of the Greek adjective platys (wide, ¯attened) and the Latin substantive rostrum (snout) and refers to the apically ¯at and widened rostrum.

Biological note

This species was collected on a Nothofagus sp. with large leaves, presumably N. grandis or N. X aviramea. The young leaves of this species remain folded along the median nerve for a relatively long time and it is these leaves that are selected for preparing nidi by the female weevil. Cutting a marginal section from the leaf, the weevil obtains a double layer of leaf tissue. When leaves used for nidus preparation later unfold, they have symmetric scars on their lateral margins.

ARC

Atlantic Reference Centre

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Attelabidae

Genus

Euops

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