Thyestetha lubrica Eberle & Riedel

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 : 11-13

Thyestetha lubrica Eberle & Riedel sp. n.

( Figs. 5 , 14 , 25, 28, 45–46, 72)

Thyestetha carbonaria Faust : Voss, 1960: 343.

Thyestetha nitida Pascoe : Voss, 1960: 344.

Diagnosis. Disc of pronotum smooth, polished, with small punctures in apical 1/4, black. Elytra black, disc glabrous, striae largely effaced; apex laterally punctate ( Figs. 5 , 14 ). Rostral canal subglabrous. Aedeagus ( Figs. 45–46 ) apically converging with sinuate sides. Transfer apparatus in dorsal view at middle strongly constricted.

Description. Holotype, male. Length. Pronotum + elytra: 4.2 mm. Color. Antenna, rostrum and tarsi ferruginous; remainder entirely black. Habitus subovate, in dorsal view almost without constriction between pronotum and elytra ( Fig. 5 ); profile dorsally with shallow constriction between pronotum and elytron ( Fig. 14 ).

Rostrum 5.2 X as long as wide at base. Head. Vertex medially and next to eye with distinct punctures.

Prothorax 1.2 X wider than long; anterior 1/4 of disc punctate with small punctures, remainder subglabrous and with minute punctures (except for row of coarse punctures along base); sides punctate with small punctures; postocular lobe coarsely punctate with larger punctures; marginal carina externally along edge with few whitish scales; inner surface of rostral canal with scattered long setae.

Elytra as long as wide; sides rounded; apex slightly extended, jointly rounded; striae effaced on elytral disc, striae 8 and 9 apically distinct; interstices between punctures of stria 8 equal to diameter of punctures, interstices between punctures of stria 9 small. Metanepisternum 3.4 X wider than high.

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

Legs. Femora basally sparsely punctate, apically denser, scales slender; meso- and metafemur dorsally with broader scales; metafemur with denser scaling, dorsal squamose line moderately dense; anteroventral ridges relatively weak with posteroventral ridge in apical third moderately protruding.

Abdomen. Ventrite 1 laterally and center of ventrite 2 with few thin scales arising from punctures; remaining ventrites subglabrous except lateral margins slightly squamose.

Terminalia. Aedeagus ( Figs. 45–46 ). Apex strongly curved ventrad, sides sinuate, converging; lateral orificial sclerites small, outer portion 2– 3 X longer than inner portion; anterior median orificial sclerite with small bulge between 2nd and 3rd fold (as in Fig. 35 ). Transfer apparatus in profile weakly incised at middle, ventral contour angularly projecting; anterior and posterior ends curved ventrad; in dorsal view strongly constricted at middle, anterior portion narrower than posterior portion. Sclerotized part of ventral membrane extending proximad 0.75 X length of aedeagal body from insertion of apodemes.

Allotype, female. Same as holotype except: Rostrum 5.43 X longer than wide. Prothorax 1.21 X longer than wide. Elytra 1.04 X longer than wide; extreme apex slightly more slender. Metafemur without concavity basal to stridulatory patch, posteroventral ridge not protruding. Terminalia. Hemisternites of ovipositor 5.75 X longer than wide. Tergite VII 1.44 X longer than wide. Tergite VIII 2.73 X longer than wide. Bursal sclerite at insertion of spermathecal duct weakly sclerotized.

Intraspecific variation. Length, males 2.8–4.5 mm (n=9, x = 4.1 mm ± 0.6 mm), females 3.0– 4.5 mm (n=13, x = 4.1 mm ± 0.5 mm). Color of body black or dark ferruginous (in a few specimens); two teneral specimens from Wannang-village with ferruginous elytra contrasting to black pronotum. Aedeagus with apex less markedly curved in some specimen from Madang. Spermathecal cornu moderately to strongly curved.

Etymology. The epithet is based on the Latin adejective lubricus, -a, -um (slippery) and refers to the smooth and slippery body of this species.

Material examined (188 Exx). Male, holotype: ARC0565 (EMBL Accession # HE802606 , HE802620 , HE802628 , HE802633 , HE802640 , HE802648 , HE802656 ): WEST NEW GUINEA, Jayapura Reg., Cyclops Mts. , S02°32.2' E140°30.4', 670m, 2.XII.2007 ( MZB) . Paratypes: WEST NEW GUINEA, Jayapura Reg., Sentani, Cyclops Mts.: 1 female: ca. 300m, 19–21.IX.1990 ( ARC) ; 1 male, 1 female: 300m, 9–10.VIII.1991 ( ARC) ; 4 males, 2 females: 300m, III.1992 ( NHMB) ; 1 female: 400–800m, 7.VIII.1992 ( ARC) ; 1 female (allotype) 400–500m, 10.VIII.1992 ( SMNK) ; 1 female: 300–550m, 2.X.1992 ( ARC) ; 1 male: 950–1450m, 3.X.1992 ( ARC) ; 1 female: 850–950m, 16.X.1996 ( ARC) ; 1 male: 350–850m, 16.X.1996 ( ARC) ; 1 male: ARC 0891 ( EMBL Accession # HE802608 , HE802621 , HE802634 , HE802641 , HE802649 , HE802657 ) , strid + Mim 1", 600–620m, 19.IX.2007 ( SMNK) ; 1male, 2 females (1 marked ARC 2336, EMBL Accession # HE802617 ) : S02°32.2' E140°30.4' , 545–700m, 2.XII.2007 ( SMNK) ; PAPUA NEW GUINEA, Madang Prov.: 1 female: Salembem village, S04°42' E 145°24' , 750m, 16.XII.2000 ( NHMB) ; 2 females: Ohu village near Gum r., S05°13' E145°41' , 150m, VI–VIII.1999 ( NHMB) ; 1 male: Ohu village, 05°14'S 145°41'E, 2.III.2008, CURC 152, Fruit No.OhS 7·I ( NMNH) ; 2 males, Madang Prov.: Ohu vill., 05°14'S 145°41'E, 150m, 28.IV.2003 ( GPSC) ; 2 males, Madang Prov.: Mis vill., S05°11' E145°47' , 200m, 16.XI.2002 ( GPSC) ; 2 females: Baitabag village, S05°08', E145°46' , 50m, IV.1999 ( NHMB) ; 1 male, 1 female, Baitabag village, S05°08' E145°46' , 50m, 19.X.2002 ( GPSC) ; 1 male, Baitabag village, S05°08'19'' E145°46'34'', 100m, 30.I.2000 ( CMNC) ; 2 males, 1 female, Baiteta, S05°00'32'' E145°46'16'', 150m, 1.II.2000 ( CMNC) ; Baiteta ( IRSNB): 1 Ex: 30.VI.1993 ; 2 Exx: 15.III.1994 ; 1 Ex: 23.III.1994 ; 4 Exx: V.1995 ; 1 Ex: 03.VII.1995 ; 10 Exx: 13.VII.1995 ; 3 Exx: 19.VII.1995 ; Baiteta, Canopy Mission, ( IRSNB) , [no dates given]: 1 Ex: FOG AR43-2, CCL-14593 ; 1 Ex: FOG AR43-2, CCL-14594 ; 1 Ex: FOG AR43-12, CCL-14607 ; 1 Ex: FOG AR49-2, CCL-14834 ; 1 Ex: FOG AR49-4, CCL-14848 ; 1 Ex: FOG AR50-1, CCL-14881 ; 1 Ex: FOG AR50-3, CCL-14886 ; 1 Ex: FOG AR50-17, CCL-14920 ; 1 Ex: FOG AR51-4, CCL-14930 ; 1 Ex: FOG AR51-13, CCL-14945 ; 1 Ex: FOG AR51-15, CCL-14952 ; 1 Ex: FOG AR51-20, CCL-14964 ; 1 Ex: FOG AR55- 16, CCL-15172 ; 1 Ex: FOG AR56-18, CCL-15236 ; 1 Ex: FOG AR57-12, CCL-15277 ; 1 Ex: FOG AR57-17, CCL-15290 ; 1 Ex: FOG AR60-9, CCL-15309 ; 2 Exx: FOG AR60-11, CCL-15311 ; 1 Ex: FOG AR60-11, CCL-15312 ; 1 Ex: FOG AR61-1, CCL-15320 ; 1 Ex: FOG AR61-9, CCL-15328 ; 1 Ex: FOG AR62-9, CCL-15352 ; 1 Ex: FOG AR62-11, CCL-15357 ; 1 Ex: FOG AR62-18, CCL-15369 ; 1 Ex: FOG AR62-20, CCL-15370 ; 1 Ex: FOG AR63-10, CCL-15377 ; 1 Ex: FOG AR63-16, CCL-15379 ; 1 Ex: FOG AR64-3, CCL-15390 ; 1 Ex: FOG AR64-20, CCL-15414 ; 1 Ex: FOG AR66-3, CCL-15426 ; 1 Ex: FOG AR66-3, CCL-15427 ; 1 Ex: FOG AR67-2, CCL-15459 ; 1 Ex: FOG AR69-4, CCL-15490 ; 1 Ex: FOG AR69-8, CCL-15497 ; 1 Ex: FOG AR69-8, CCL-15499 ; 1 Ex: FOG AR69-15, CCL-15507 ; 1 Ex: FOG AR70-14, CCL-15559 ; 1 Ex: FOG AR70-17, CCL-15570 ; 1 Ex: FOG AR70- 18, CCL-15574 ; 1 Ex: FOG AR70-19, CCL-15583 ; 1 Ex: 10.III.1993, FOG T1-8, CCL-6049 ; 1 Ex: 10.III.1993, GLU T1-17, CCL-6076 ; 1 Ex: 18.V.1993, FOG M6-09, CCL-0438 ; 1 Ex: 18.V.1993, FOG M6-18, CCL-0367 ; 1 Ex: 08.VI.1993, FOG T9-09, CCL-1128 ; 1 Ex: 22.VI.1993, FOGM 1-16, CCL-0510 ; 1 Ex: 24.VI.1993, FOG T2- 18, CCL-0102 ; 1 Ex: 04.V.1994, FOG XO-6, CCL-3392 ; 1 Ex: 04.V.1994, FOG XO-8, CCL-3430 ; 1 Ex: 08.VI.1994, FOG ART12-1, CCL-3327 ; 1 Ex: 15.III.1994, FOG XG-10, CCL-3752 ; 1 Ex: 15.III.1994, FOG XG-13, CCL-3676 ; 1 Ex: 27.IV.1995, FOG AR1-1, CCL-6314 ; 1 Ex: 27.IV.1995, FOG AR1-11, CCL-6379 ; 1 Ex: 27.IV.1995, FOG AR1-18, CCL-6449 ; 1 Ex: 27.IV.1995, FOG AR1-4, CCL-6330 ; 1 Ex: 02.V.1995, FOG AR2-12, CCL-6515 ; 1 Ex: 02.V.1995, FOG AR2-15, CCL-6520 ; 1 Ex: 02.V.1995, FOG AR2-16, CCL-6521 ; 1 Ex: 02.V.1995, FOG AR2-19, CCL-6530 ; 1 Ex: 02.V.1995, FOG AR2-5, CCL-6503 ; 1 Ex: 05.V.1995, FOG AR4-10, CCL-6678 ; 1 Ex: 06.V.1995, FOG AR4-15, CCL-6764 ; 1 Ex: 10.V.1995, FOG AR5-7, CCL-6154 ; 1 Ex: 10.V.1995, FOG AR5-8, CCL-6156 ; 1 Ex: 10.V.1995, FOG AR5-9, CCL-6169 ; 1 Ex: 10.V.1995, FOG AR5-13, CCL-6184 ; 1 Ex: 17.V.1995, FOG AR6-14, CCL-6278 ; 1 Ex: 17.V.1995, FOG AR6-19, CCL-6301 ; 1 Ex: 25.V.1995, FOG AR8-1, CCL-6829 ; 1 Ex: 25.V.1995, FOG AR8-1, CCL-6830 ; 1 Ex: 25.V.1995, FOG AR8-14, CCL-6943 ; 1 Ex: 26.V.1995, FOG AR9-20, CCL-7169 ; 1 Ex: 08.VI.1995, FOG AR12-17, CCL-7261 ; 1 Ex: 08.VI.1995, FOG AR12-9, CCL-7228 ; 1 Ex: 08.VI.1995, FOG AR12-15, CCL-7202 ; 1 Ex: 08.VI.1995, FOG AR7-2, CCL-7005 ; 1 Ex: 08.VII.1995, FOG AR25-9, CCL-8220 ; 1 Ex: 09.VI.1995, FOG AR13-19, CCL-7311 ; 1 Ex: 15.VI.1995, FOG AR15-10, CCL-7395 ; 1 Ex: 15.VI.1995, FOG AR15-11, CCL-7399 ; 1 Ex: 17.VI.1995, FOG AR6-10, CCL-6259 ; 1 Ex: 17.VI.1995, FOG AR6-19, CCL-6303 ; 1 Ex: 21.VI.1995, FOG AR17-15, CCL-7533 ; 1 Ex: 22.VI.1995, FOG AR18-5, CCL-7561 ; 1 Ex: 22.VI.1995, FOG AR18-8, CCL-7567 ; 1 Ex: 27.VI.1995, FOG AR1-18, CCL-6452 ; 1 Ex: 27.VI.1995, FOG AR1-4, CCL-6330 ; 1 Ex: 30.VI.1995, FOG AR22-13, CCL-7981 ; 1 Ex: 30.VI.1995, FOG AR22-14, CCL-7983 ; 1 Ex: 30.VI.1995, FOG AR22-19, CCL-7996 ; 1 Ex: 30.VI.1995, FOG AR22-8, CCL-7956 ; 1 Ex: 04.VII.1995, FOG AR23-3, CCL-8006 ; 1 Ex: 04.VII.1995, FOG AR23-7, CCL-8008 ; 1 Ex: 04.VII.1995, FOG AR23-9, CCL-8015 ; 1 Ex: 04.VII.1995, FOG AR23-10, CCL-8019 ; 1 Ex: 04.VII.1995, FOG AR23-10, CCL-8020 ; 1 Ex: 06.VII.1995, FOG AR25-15, CCL-8270 ; 1 Ex: 06.VII.1995, FOG AR25-17, CCL-8285 ; 1 Ex: 06.VII.1995, FOG AR25-9, CCL-8219 ; 1 Ex: 07.VII.1995, FOG AR26-13, CCL-8463 ; 1 Ex: 07.VII.1995, FOG AR26-15, CCL-8454 ; 1 Ex: 07.VII.1995, FOG AR26-2, CCL-8334 ; 1 Ex: 07.VII.1995, FOG AR26-2, CCL-8342 ; 1 Ex: 07.VII.1995, FOG AR26-20, CCL-8499 ; 1 Ex: 07.VII.1995, FOG AR26-8, CCL-8401 ; 1 Ex: 07.VII.1995, FOG AR26-16, CCL-8461 ; 1 Ex: 11.VII.1995, FOG AR27-5, CCL-8539 ; 1 Ex: 11.VII.1995, FOG AR27-6, CCL-8542 ; 1 Ex: 11.VII.1995, FOG AR27-8, CCL-8557 ; 1 Ex: 12.VII.1995, FOG AR28-7, CCL-8590 ; 1 Ex: 14.VII.1995, FOG AR27-5, CCL-8537 ; 1 Ex: 14.VII.1995, FOG AR30-8, CCL-8742 ; 1 Ex: 18.VII.1995, FOG AR31-1, CCL-9172 ; 1 Ex: 18.VII.1995, FOG AR 31-9, CCL-9188 ; 1 Ex: 27.VII.1995, FOG AR36-1, CCL-9421 ; 1 Ex: 27.VII.1995, FOG AR36-19, CCL-9322 ; 1 Ex: 27.VII.1995, FOG AR36-2, CCL-9464 ; 1 Ex: 27.VII.1995, FOG AR36-2, CCL-9465 ; 1 Ex: 27.VII.1995, FOG AR36-3, CCL-9469 ; 1 Ex: 27.VII.1995, FOG AR36-3, CCL-9472 ; 1 Ex: 07.VIII.1995, FOG AR26-1, CCL-8325 ; 1 Ex: Baiteta, 150 m ( IRSNB) ; 2 females: Astrolabe Bay, Erima, Biró, 1897 ( HNHM) ; 1 female: Biró, 1896 ( HNHM) ; 1 male: New Guinea, Fenichel ( HNHM) ; Unknown locality: 1 female: Bingu, Wahuis, Coll. Hartmann ( SMTD) . Not included in type series : PAPUA NEW GUINEA, Madang Prov., nr. Wannang vill., S05°13' E 145°11', ca. 115m: 1 male: 22–30.XI.2002 ( GPSC) , 1 female, 09–15.XII.2002 ( GPSC) ; 2 females, Miss, 8 km SW Madang, S05°11'33'' E145°44'55'', 150m, 02.II.2000 ( CMNC) ; 1 male, Uho village, 20 km SW Madang, S05°14'07'' E145°40'54'', 250m, 29.I.2000 ( CMNC) .

Distribution ( Fig. 72 ). Jayapura Reg. (Cyclops Mts.), Madang Prov. (Baiteta, Baitabag, Ohu, Salembem). Elevation: 50– 850 m.

Notes. The aedeagus of the male from Uho village is somewhat intermediate to T. glabra sp. n.. Additional specimens from this area should be sampled and molecular data analyzed to clarify if a zone of hybridization between both species exists.

Figures

FIGURE 72. Distribution of Thyestetha glabra sp. n., T. lubrica sp. n., T. puncticollis sp. n., and T. splendens 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.

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 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..