Thyestetha nitida Pascoe

Eberle, Jonas, Tänzler, Rene & Riedel, Alexander, 2012, Revision and phylogenetic analysis of the Papuan weevil genus Thyestetha Pascoe (Coleoptera, Curculionidae, Cryptorhynchinae), Zootaxa 3355 (1), pp. 1-28 : 13-19

Thyestetha nitida Pascoe

( Figs. 6 , 15 , 23a–b , 32–34 , 47–48 , 58–60 , 64–65 , 67–71 )

Thyestetha nitida Pascoe, 1865: 427 (type locality: Aru Isl.).

Thyestetha nitida Pascoe, 1885: 283 .

Pantoxistus rubripennis Chevrolat 1881 : LXIX (type locality: Fly River) syn. n.

Diagnosis. Habitus elongate subovate. Pronotum densely punctate with small punctures, punctures finer near base; black. Elytra ferruginuous; with distinct small punctures, interstices 1– 3 X diameter of punctures ( Figs. 6 , 15 ). Rostral canal and marginal carinae covered with scales. Dorsal squamose line of metafemur dense, conspicuous. Aedeagus ( Figs. 47–48 ) with apex curved ventrad, sides sinuate, converging; transfer apparatus fusiform in dorsal view.

Description. Lectotype, male. Length. Pronotum + elytra: 5.3 mm. Color. Antenna, tarsi and rostrum ferruginous; head, prothorax and legs ferruginous to black; elytra and remaining ventral surface dark red. Habitus elongate-subovate, in dorsal view slightly constricted between pronotum and elytra ( Fig. 6 ); profile dorsally constricted between pronotum and elytron ( Fig. 15 ).

Rostrum 5.5 X as long as wide at base, with small scattered scales. Head. Vertex with small punctures, medially strongly punctate, few white scales near eye.

Prothorax 1.2 X wider than long; postocular lobe weakly developed; disc densely punctate with small punctures (except basal row of coarse punctures), interstices larger in basal half, smooth, polished; sides densely punctate with small punctures, posterior margin with white scales; rostral canal and marginal carinae with overlapping cream-colored scales.

Elytra 1.1 X longer than wide; sides rounded; apex distinctly extended, jointly rounded; punctures of striae 1–9 distinctly impressed from base to apex; interstices 1– 3 X wider than diameter of punctures, interstices between punctures of stria 9 ca. 0.5 X diameter of puncture. Metanepisternum 2.8 X wider than high.

Thoracic venter. Meso- and metaventrite strongly squamose; metaventrite submedially behind mesocoxa with pair of conspicuous protrusions. Pro- and mesocoxa densely punctate, squamose; metacoxa subglabrous; trochanter with sparse, coarse punctures containing scales. Distance between mesocoxae subequal to width of mesocoxa.

Legs. Profemur moderately punctate; meso- and metafemur laterally sparser, scales broader dorsally and ventrally; dorsal squamose line of metafemur dense, conspicuous; anteroventral ridges conspicuous. Metafemur in apical third with distinctly protruding posteroventral ridge.

Abdomen. Ventrites 1 to 4 entirely squamose; ventrite 5 basally with scales, remainder setose.

Terminalia. Aedeagus ( Figs. 47, 48 ). Apex moderately curved ventrad, sides sinuate, converging; lateral orificial sclerites elongate, inner portion 3 X longer than outer portion; anterior median orificial sclerite simple between 2nd and 3rd fold (as in Fig. 36 ). Dorsal and ventral contour of transfer apparatus straight; anterior and posterior ends weakly curved ventrad; in dorsal view fusiform. Sclerotized part of ventral membrane extending proximad 0.69 X length of aedeagal body from insertion of apodemes.

Selected female specimen. Same as holotype except: Rostrum 6.50 X longer than wide. Prothorax 1.06 X longer than wide. Elytra as long as wide; apex less extended, slightly more slender. Metafemur without concavity basal to stridulatory patch, posteroventral ridges slightly protruding. Terminalia. Hemisternites of ovipositor 10.75 X longer than wide. Tergite VII ( Fig. 60 ) 2.23 X longer than wide. Tergite VIII ( Fig. 59 ) 1.93 X longer than wide. Bursal sclerite ( Fig.65 ) at insertion of spermathecal duct weakly sclerotized.

Intraspecific variation. Length, males 3.2–5.4 mm (n=5, x = 4.8 mm ± 0,9 mm), females 3.6–5.2 mm (n=13, x = 4.5 mm ± 0.5 mm) in females. Elytra dark or light ferruginous. Prothorax. Anterior 1/4 of disc punctate with small punctures, remainder with minute punctures (except for row of coarse punctures along base) in most specimen. Pronotum and elytra relatively weakly punctate in one small female from the Papuan Gulf. Elytral apex sometimes slightly emarginate.

Material examined (5 males, 13 females). Male, lectotype: INDONESIA, Maluku Prov., Aru Island ; labels ( Fig. 67 ): 1) [round, white with red margin] Type [printed] 2) [ovate, blue] Aru [hand-written] 3) [rectangular, white] Thyestetha nitida Type Pasc [hand-written] 4) [rectangular, white with black margin] Thyestetha nitida Pasc. [hand-written] 5) [rectangular, white] Pascoe Coll., 93-60 [printed] 6) [rectangular, red] LECTOTYPE, Thyestetha nitida, Pascoe [printed]; condition: right middle leg dislodged together with coxa, glued on extra card; left protarsomere 5 missing; specimen originally pinned, remounted on point; genitalia in glycerol in microtube ( BMNH) . Other material examined: 2 females: INDONESIA, Maluku Prov., Aru Island ( BMNH) . WEST NEW GUINEA: 1 male: Sorong Reg., Batanta Island, Waylebet, 500–820m, 29.X.–1.XI.1996 ( ARC) ; Manokwari Reg.: 1 male: Manokwari, Gn. Meja, 200m, 24.VIII.1991 ( ARC) ; 1 male: 14 km NE Ransiki, Warbiati (Oransbari), 1° 18.25'S 134°14.14'E, 2.III.2007, cutt. area ( NKME) ; 1 female: Dorey (coll. Pascoe, BMNH) ; Wasior Reg.: 1 female: Wandammen Bay, Wondiwoi Mts., Wasior, 300–850m, 5.I.2001 ( ARC) ; 1 female: Wasior, DMP logging camp, Km 38, Sararti, S03°05' E 134°27', 100–200m, 7–9.I.2001 ( ARC) . PAPUA NEW GUINEA, Western Prov.: 3 females: Fly River (2 Exx Coll. Pascoe, 1 Ex Coll. Fry, BMNH) ; 1 male, Fly River, 1876–77, M.L.D’Albertis, lectotype of Pantoxistus rubripennis Chevrolat (Figs. 68–70) ( NHRS) ; 1 male, 1 female: Morobe Prov.: Lakekamu Basin, Tekadu, 400–500m, 28.II.1998 ( ARC) ; Central Prov., Moroka area: described female: ARC 1352 ( EMBL Accession # HE802610 , HE802623 , HE802629 , HE802636 , HE802651 , HE802659 ), Berogoro, S09°24.213’ E147°33.870’ – S09°23.647’ E147°34.244’, 500–565m, 26.X.2009 ( SMNK) ; 1 female: ARC 1353 ( EMBL Accession # HE802611 ), Beremutana, S09°25.515’ E147°33.136’ – S09°25.754’ E147°33.485, 535– 700m, 28.X.2009 ( SMNK) ; 1 female: ARC 1351 ( EMBL Accession # HE802609 , HE802622 , HE802635 , HE802642 , HE802650 , HE802658 ), Wariaga, S09°25.350’ E147°31.047’ – S09°25.683’ E147°31.707, 650– 920m, 27.X.2009 ( SMNK) ; 1 female: Papua Gulf, E. Weiske ( SMTD) .

Distribution ( Fig. 71 ). Maluku (Aru Isl.), Sorong Reg. (Batanta Isl.), Manokwari Reg. (Manokwari, Warbiati), Wasior Reg. (Wasior), Western Prov. (Fly Riv.), Morobe Prov. (Tekadu), Central Prov. ( Papua Gulf, Moroka). Elevation: 100– 650 m.

Notes. For this study, one type specimen of T. nitida from the Aru islands was available. Pascoe (1865) did not fix a holotype and additional syntypes may exist. Therefore, a lectotype is designated to ensure stability of nomenclature.

Two syntypes of Pantoxistus rubripennis Chevrolat were examined. They were attached to one pin, with one set of labels. The upper syntype is a male of Thyestetha nitida (Figs. 68–70), the lower one a female specimen of the genus Telaugia Pascoe. The upper syntype is designated lectotype to ensure stability of nomenclature. Thus, Pantoxistus rubripennis Chevrolat becomes a junior synonym (syn. n.) of Thyestetha nitida . The paralectotype is attached to a separate pin.

Figures

FIGURE 71. Distribution of Thyestetha carbonaria, T. discolor sp. n., T. emarginata sp. n., T. nitida, and T. oblita sp. n..

FIGURES 1 – 9. Habitus of Thyestetha spp., dorsal aspect: (1) T. carbonaria, lectotype; (2) T. discolor sp. n., holotype; (3) T. emarginata sp. n., holotype; (4) T. glabra sp. n., holotype; (5) T. lubrica sp. n., holotype; (6) T. nitida; (7) T. oblita sp. n., holotype; (8) T. puncticollis sp. n., holotype; (9) T. splendens sp. n., holotype.

FIGURES 10 – 18. Habitus of Thyestetha spp., lateral aspect: (10) T. carbonaria, lectotype; (11) T. discolor sp. n., holotype; (12) T. emarginata sp. n., holotype; (13) T. glabra sp. n., holotype; (14) T. lubrica sp. n., holotype; (15) T. nitida, lectotype; (16) T. oblita sp. n., holotype; (17) T. puncticollis sp. n., holotype; (18) T. splendens sp. n., holotype.

FIGURE 23 a – b. Thyestetha nitida, pleural sclerites; c 2 mesocoxa, c 3 metacoxa, el elytron, epm 2 metanepimeron, eps 2 mesanepisternum, eps 3 metanepisternum, mr mesothoracic receptacle, s 3 metaventrite. Fig. 23 c. Mesothoracic receptacle of Elichora sp.; Figs. 24 – 28. Thyestetha spp.: (24) T. glabra sp. n., detail of mesothoracic receptacle, ventral view. (25) T. lubrica sp. n., female elytral apex in profile; arrow marking subapical constriction. (26) T. carbonaria, male metafemur, arrow marking protrusion of posteroventral ridge; (27) T. puncticollis sp. n., male metafemur with weakly protruding posteroventral ridge (28) T. lubrica sp. n., left metafemur, arrow marking subapical concavity.

FIGURES 29 – 36. Male terminalia of Thyestetha spp.: (29 – 31) T. glabra sp. n., holotype: (29) tegmen, (30) tergite VII and (31) segments VIII – IX. (32 – 34) T. nitida: (32) tegmen, (33) tergite VII and (34) tergite VIII with sternite VIII and spiculum gastrale. Ostium, lateral aspect: (35) T. discolor sp. n., arrow and dashed line marking bulge between 2 nd and 3 rd fold (36) T. splendens sp. n..

FIGURES 37 – 54. Aedeagus of Thyestetha spp. in dorsal and lateral aspect: (37, 38) T. carbonaria, lectotype; (39, 40) T. discolor sp. n., holotype; (41, 42) T. glabra sp. n., holotype; (43) T. carbonaria, apex of aedeagus, ventral aspect; (44) T. oblita sp. n., holotype, apex of aedeagus, ventral aspect; (45, 46) T. lubrica sp. n., holotype; (47, 48) T. nitida, lectotype; (49, 50) T. oblita sp. n., holotype; (51, 52) T. puncticollis sp. n., holotype and (53, 54) T. splendens sp. n., holotype.

FIGURES 55 – 60. Female terminalia of Thyestetha spp.: (55 – 57) T. emarginata sp. n., holotype: (55) sternite VIII, (56) tergite VIII and (57) tergite VII. (58 – 60) T. nitida: (58) sternite VIII, (59) tergite VIII and (60) tergite VII.

FIGURES 61 – 65. Female genitalia of Thyestetha spp.: (61 – 63) T. emarginata sp. n., paratype: (61) tripartite sclerite at insertion of spermathecal duct. T. emarginata sp. n., holotype: (62) Spermatheca. (64 – 65): T. nitida (64) ovipositor, lateral aspect.

FIGURES 66 – 67. Collection labels of Thyestetha spp.: (66) T. carbonaria, lectotype; (67) T. nitida, lectotype. FIGURES 68 – 70. Pantoxistus rubripennis, lectotype: (68) collection labels; (69) dorsal aspect, (70) ventral aspect.