Potemnemus scabrosus ( Olivier, 1790: 294 )

Wallin, Henrik & Kvamme, Torstein, 2015, A review of the genus Potemnemus Thomson, 1864 (Coleoptera: Cerambycidae) with description of a new species from Papua New Guinea, Zootaxa 4040 (5), pp. 501-542 : 516-517

Potemnemus scabrosus ( Olivier, 1790: 294)

Figs. 1, 2, 3, 4, 5, 6 , 45 , 51, 52, 53, 54 , 81 .

Cerambyx scabrosus Olivier, 1790

Potemnemus loriai Breuning, 1956: 245 nov. syn.

Potemnemus trituberculatus Breuning, 1942: 120 nov. syn. (assumed to be a synonym by De Jong, 1947 but not formalized).

Notes. There are several misspellings and incorrect use of names: Cerambix scabrosus Olivier, 1795 ; Potemnemus sabrosus Thomson, 1864 (sic); Protemnemus scabrosus Pascoe, 1866 (nec Olivier, 1790); Protemnemus scabrosus Vollenhoven, 1871 (nec Olivier, 1790).

The type is lost and, as far as we know, the original description only refers to one male specimen, which would have been the holotype if found. Since we have found no other specimens from Olivier’s collection, the original drawing ( Olivier 1795; Plate 10, Fig. 70 ) has been designated as lectotype in agreement with the International code of zoological nomenclature (ICZN 1999). Type locality is Indonesia, Moluccas ( Olivier 1795).

Examined specimens. 1♂ CUN, BL = 40.0 mm, Papua New Guinea: Morobe Province (MP), Near Anodya, 1991.06, leg. Clark; 1♀ CUN, BL = 40.0 mm, MP, Aseki, 1991.07; 1♀ IRSNB, BL = 49.0 mm, Wareo, 1910; 1♀ IRSNB, BL = 37.0 mm, Madang Province, Baiteta, 1996.07.10, leg. O. Missa (canopy mission); 1♀ MNHUB, BL = 42.0 mm, Sattelberg (near Finschhafen on the Huon Peninsula); 1♂ MNHUB, BL = 33.0 mm, Sattelberg; 1♀ MNHUB, BL = 37.0 mm, Sattelberg; 1♀ MNHUB, BL = 42.5 mm, Sattelberg; 1♀ MNHUB, BL = 38.0 mm, Sattelberg; 1♂ CHW, BL = 34.5 mm, Indonesia: Papua (Irian Jaya), Nabire, 2007.10; 1♂ CHW, BL = 32.0 mm, Papua (Irian Jaya), Timika, 2007.01; 1♀ CHW, BL = 34.0 mm, Papua (Irian Jaya), Timika, 2007.01; 1♀ CHW, BL = 35.0 mm, (Irian Jaya), Nabire, 2007.10.

Potemnemus trituberculatus Breuning, 1942: 120 nov. syn. ( Fig. 4 )

Examined type specimen. HT ♂ BMNH, 38.2 mm (photo examination), Indonesia, West Papua, Saylee, Dorey (Manokwari).

Notes. the specimen referred to as a type in the re-description by Breuning (1944), and deposited at FCNMB, is P. trimaculatus sp. res. (photo examination). P. trituberculatus nov. syn. is a junior synonym of P. scabrosus (priority principle according to ICZN).

Potemnemus loriai Breuning, 1956: 245 nov. syn. ( Figs. 5, 6 )

Examined type specimen. HT ♀ MCNG (photo examination), BL = 32.0 mm, Papua New Guinea, Central Province, Moroka 1000 m, 1893.10.11, leg. L. Loria.

Re-description: a large and relatively broad (BL = 32.0–49.0 mm), ash-grey species with body approximately 2.8 x longer than wide ( Figs. 1, 2, 4, 5 ). Antennae: relatively short in females and relatively long in males, extending beyond apices by about 3–4 antennomeres in females and by about 4–5 antennomeres in males. Thorax: pronotum with three broad and strongly elevated tubercles medially on pronotum ( Fig. 45 ). The tubercles are mostly of similar height, and the middle tubercle is rarely reduced in height or even absent ( Figs. 4, 5 ). The surface on pronotum below the median tubercles is heavily wrinkled (most pronounced in larger specimens). There is a very weak, longitudinal and ochreous line on pronotum, visible anteriorly and posteriorly of the broad tubercles on the middle of pronotum. Elytra: convex, and the elevated transverse ridge on the middle of elytra is distinct.

Mostly ash-grey with entire epipleuron light brown ( Figs. 1–3 ). Elytra have one uniform and rounded or squareformed dark brown patch with plush-like pubescence which surrounds scutellum. The patch is only slightly elongated along the suture, and two additional dark brown patches are situated laterally near apices. Elytra are strongly narrowing towards apex in males ( Fig. 1 ). Spines scattered along lateral carina on elytra mostly fine, but sometimes longer and “hook-like. Spines surrounding the triangular patch around scutellum are mostly rounded. Legs: relatively long and supplied with mottled brownish and greyish pubescence. Venter: prosternal process pubescent at base, with a large, broad, and rounded tubercle anteriorly. Mesosternum with a small, white patch laterally. The remaining parts of venter have short, brownish pubescence. Male genitalia: aedeagus (about 6.1 mm long) relatively short and weakly curved towards apex ( Fig. 51 ), with dorsal surface distinctly wrinkled medially ( Fig. 52 ) and sometimes along the entire surface. Parameres are broad and about 2.0 mm long, and the inner margin evenly straight towards apex ( Fig. 53 ). Apex rounded with relatively long setae attached ventrally, and the projection at base between the two parameres sharp and pointing ( Fig. 53 ). Tergite VIII (about 3.5 mm long) almost square with anterior margin slightly concave and covered with relatively fine and short setae, surface is glabrous medially ( Fig. 54 ). The colour of male genitalia is brown to dark brown.

Remarks. P. scabrosus is most similar to P. trimaculatus sp. res., but is easily separated by the three large and raised tubercles medially on pronotum, the absence of a brown patch medially on pronotum, and the rounded brown patch covering scutellum. P. scabrosus is a widespread species occurring in the Moluccas and on the western and eastern parts of the island of New Guinea ( Fig. 81 ).

Figures

FIGURE 81. Known records of Potemnemus spp. (red numbers) and Periaptodes spp. (blue numbers) from Australia, the island of New Guinea, Moluccas and Solomon Islands. 1. Potemnemus ennevei De Jong, 1947, 2. Potemnemus kaszabi (Breuning, 1973), 3. Potemnemus lima Pascoe, 1866, 4. Potemnemus nylanderi Wallin & Kvamme, 2014 nov. sp., 5. Potemnemus pristis Pascoe, 1866, 6. Potemnemus rosenbergii Vollenhoven van, 1871, 7. Potemnemus scabrosus (Olivier, 1790), 8. Potemnemus sepicanus Kriesche, 1923, 9. Potemnemus thomsoni Lansberge, 1880 sp. res., 10. Potemnemus trimaculatus Lea, 1918 sp. res., 11. Potemnemus tuberifer Gahan, 1894, 12. Potemnemus wheatcrofti (Breuning, 1971) comb. nov., 13. Potemnemus wolfi Berchmans, 1925 sp. res., 14. Periaptodes frater (Van de Poll, 1887), 15. Periaptodes lictor Pascoe, 1866, 16. Periaptodes olivieri (Thomson, 1864), 17. Periaptodes potemnemoides Kriesche, 1936, 18. Periaptodes testator Pascoe, 1866, 19. Periaptodes paratestator Breuning, 1980.

FIGURES 1 – 6. Habitus. 1. ♂ Potemnemus scabrosus (Olivier, 1790) 40.0 mm (photo: U. Nylander); 2. ♀ P. s c ab ro s us (Olivier, 1790), 40.0 mm (photo: U. Nylander); 3. ♀ P. scabrosus (Olivier, 1790), lateral view; 4. HT ♂ P. trituberculatus Breuning, 1942 nov. syn., 38.2 mm (photo: M. Barklay, BMNH); 5. HT ♀ P. loriai Breuning, 1956 nov. syn., 32.0 mm (photo: R. Poggi, MCNG); 6. HT ♀ P. loriai Breuning, 1956 nov. syn., lateral view (photo: R. Poggi, MCNG).

FIGURES 45 – 50. Pronotum. 45. ♀ Potemnemus scabrosus (Olivier, 1790); 46. ♀ P. trimaculatus Lea, 1918 sp. res.; 47. PT ♀ P. wheatcrofti (Breuning, 1971) nov. comb.; 48. PT ♀ P. nylanderi nov. sp.; 49. PT ♂ P. nylanderi nov. sp. (photo: L. Bezark); 50. PT ♀ P. nylanderi nov. sp. (photo: L. Bezark).

FIGURES 51 – 58. Male genitalia (from left to right: aedeagus lateral view, aedeagus dorsal view, parameres and tergite VIII), 51 – 54. Potemnemus scabrosus (Olivier, 1790); 55 – 58. P. trimaculatus Lea, 1918 sp. res.

FIGURES 67 – 74. Male genitalia (from left to right: aedeagus lateral view, aedeagus dorsal view, parameres and tergite VIII). 67 – 70, PT Potemnemus wheatcrofti (Breuning, 1971) nov. comb.; 71 – 74, PT P. nylanderi nov. sp.