Potemnemus nylanderi,

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: 511-512

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Potemnemus nylanderi


Potemnemus nylanderi  nov. sp.

Figs. 37, 38, 39, 40View FIGURES 37 – 40, 41View FIGURES 41 – 44, 48, 49, 50View FIGURES 45 – 50, 71, 72, 73, 74View FIGURES 67 – 74, 80View FIGURES 79 – 80, 81View FIGURE 81.

Type specimens designated: Holotype ♂ NHRS (with id NHRS-JONI 000000219), BL = 45.0 mm, BW = 14.0 mm, Papua New Guinea ( PNG), Morobe Province (MP), Wau district, Kuper Range, 2200 m, 1995.10. 27, local collector. Paratypes: 1 ♂ CUN, BL = 47.0 mm, BW= 14.0 mm, PNG, Eastern Highland Province (EHP), Okapa, 1991.06, local collector; 1 ♂ CUN, BL = 41.2 mm, BW= 13.2 mm, PNG, MP, Aseki, Hiewini Village, 1998 -03- 27, local collector; 1 ♂ CUN, BL = 42.1 mm, BW= 14.0 mm, PNG, MP, Bulolo, Manki Range, 1997.09 .0 9, local collector; 1 ♂ CUN, BL = 49.0 mm, BW= 14.0 mm, PNG, EHP, Okapa, 1991.06, local collector; 1 ♀ CUN, BL = 46.5 mm, BW = 16.0 mm, PNG, MP, Aseki, 1991.06, leg, M. Hudson; 1 ♀ CUN, BL = 54.0 mm, BW= 17.0 mm, PNG, MP, Aseki, 1991.06, leg, M. Hudson; 1 ♀ CUN, BL = 51.2 mm, BW= 16.4 mm, PNG, EHP, Okapa, 1991.06, local collector; 1 ♂ CHW, BL = 45.0mm, BW= 13.0mm, PNG, MP, Yamaiya village, 1997.08 .0 5, local collector; 1 ♂ CHW, BL = 43.5mm, BW= 13.5mm, PNG, MP, Aseki, 2000.01. 31, leg. M. Hudson; 1 ♀ CHW, BL = 54.0mm, BW= 16.5mm, PNG, EHP, Okapa, 1995.06. 19, local collector; 1 ♂ LGBC, BL = 43.0 mm, BW= 14.0 mm, PNG (no further locality data on the label), 2002 - 10, leg. L. Orsak (photo examination); 1 ♀ LGBC, BL = 57.0 mm, BW= 18.0 mm, PNG, Aseki, Morobe Province, 2002 - 10, local collector (photo examination).

Description. Large to very large species ( BL = 41.2 –57.0 mm, BW 13.0–18.0 mm), with body approximately 3.2 x longer than wide in males and 2.9 x longer than wide in females ( Figs. 37–40View FIGURES 37 – 40). Antennae: very long, longer than body by about six antennomeres in males and by about 4 to 4.5 antennomeres in females ( Figs. 37–40View FIGURES 37 – 40). Antennomeres 6–11 in males are 1.5 x to 2 x as long as each corresponding antennomere in PT male of P. wheatcrofti  comb. nov. Antennae are cylindrical, smooth and black with fine brownish pubescence and with fringes of fine hairs beneath. Scape and the two consecutive antennomeres distinctly mottled as a result of the exposed black integument, which consist of weakly tuberculated areas (more pronounced on scape). Scape is long and robust, apical process (cicatrix), with a smooth and glabrous lateral margin. Third antennomere is almost twice as long as scape. Head: brownish, frons relatively narrow in males, wider in females. Eyes very large, lower eye lobes (below scape) are very large and only slightly elongated, about 2– 3 x as long as gena below. Thorax: pronotum is narrow, slightly longer than wide, basal part of elytra about 1.5 x wider than pronotum, surface flattened, smooth and covered with very fine brownish pubescence, except a narrow, yellowish and longitudinal line, interrupted with a glabrous small spot medially. The lateral pronotal spines are widened at base and towards the glabrous edge very fine, straight and sharp. Posterior base of pronotal spines with a series of very small tubercles combined with a short whitish line. Lateral pronotal spines are acutely projecting upwards, towards the head ( Figs. 48–50View FIGURES 45 – 50). Scutellum is very small, rounded and with yellowish pubescence. Elytra: brownish and speckled with a combination of very fine brownish and whitish pubescence, medially often with a shining brownish transverse band where the integument is exposed. Basal part of each elytron has a large, more or less distinct, brownish spot laterally towards epipleuron. Elytra have acutely folded epipleuron (almost 90). The distinct margin between elytral surface and epipleuron often with a series of small glabrous and rounded tubercles, densely covered with numerous and fine granules (much more densely covered with granules than in P. wheatcrofti  comb. nov.) ( Fig. 41View FIGURES 41 – 44). Anterior part of each elytron with a bulb-like raised area medially, with larger and numerous glabrous and rounded, or sometimes slightly elongated, tubercles ( Figs. 48–50View FIGURES 45 – 50). Remaining 2 / 3 of elytra only with smaller and scattered tubercles. Elytral apices have small and blunt sutural spines, and projecting marginal spines. Legs: all legs very long and mottled with brownish and yellowish pubescence. Front legs in males are only weakly elongated and anterior femora in males are as long as, or only slightly longer, than pronotum and head combined. Tarsi are large, elongated and pubescent. Male front tarsi are without spines or projections. Claws have straight inner margin in both sexes, i.e. not saw toothed. Venter: Mesosternum, metasternum and abdominal ventrites mottled with a combination of brownish, yellowish and whitish pubescence. Mesosternal process is flattened at base, and with a distinct knob-like extension anteriorly. Last visible abdominal segment in the females is very short and the posterior margin concave.

Male genitalia. Aedeagus: 8.0–9.0 mm long and 1.4–1.5 mm wide, acutely curved towards apex ( Fig. 71View FIGURES 67 – 74). Dorsal ridge is as wide as ventral ridge, and both ridges rounded at apex with yellowish colour ( Fig. 72View FIGURES 67 – 74). The two yellowish and crescent-shaped sclerites at the proximal end of the basal phallomer are relatively wide and acutely folded. Internal sac contains a very thin, clearly sclerotized, long thread-like filament, 23.0–24.0 mm. Tegmen: 9.5–10.5 mm long, base of tegmen extended and weakly curved dorso-ventrally on middle. Parameres: 2.0– 2.1 mm long, relatively long and flattened dorso-ventrally, weakly separated medially along inner margin and projecting inwards towards apex ( Fig. 73View FIGURES 67 – 74). Base of inner margin lacks an extension from each paramere ( Fig. 73View FIGURES 67 – 74). Surface below base of parameres completely separated by a deep furrow ( Fig. 73View FIGURES 67 – 74). Apex evenly rounded along posterior margin with scattered fringes of relatively short, yellowish hairs, concentrated at edge of apex. Ventral surface of parameres with scattered punctures and fine hairs concentrated at apex, but without micro-reticulation. Tergite VIII: 3.3 –4.0 mm long and broadly convex, with yellowish to brownish pigmentation, posterior margin narrowly rounded, and covered with short, fine yellowish hairs and a few brownish setae distally towards the posterior margin ( Fig. 74View FIGURES 67 – 74). Surface covered with weak micro-reticulation.

Female terminalia. Tignum: relatively thick and almost straight or only slightly curved, 20.0 mm long. Width is approximately 0.7 mm at the widest point apically. Tergite VIII: posterior margin is 3.5 mm wide, dorsolaterally with a few scattered and small punctures, and dorso-medially glabrous and shining i.e. no microreticulation. The colour is dark brown. Spermathecal capsule: well sclerotized, brownish, consisting of two different structures: one basal spiral-like part, and a distal, elongated and relatively long, curved shaft with a rounded head ( Fig. 80View FIGURES 79 – 80). The shaft and head is 4.0 mm long.

Remarks. P. nylanderi  nov. sp. is easily separated from P. wheatcrofti  comb. nov. by the larger size, longer legs, and much longer antennae in males. Each of the antennomere 6–11 is almost twice as long as each corresponding antennomere in males of P. wheatcrofti  comb. nov. P. n y l a nd e r i nov. sp. is one of the largest species in the genus Potemnemus  apart from P. s e p i c a nu s. In addition, the body of P. wheatcrofti  comb. nov. is more flattened dorso-ventrally than in P. nylanderi  nov. sp., lateral margin of elytra almost parallel in P. wheatcrofti  comb. nov., whereas the lateral margin of P. n yl a nd e r i nov. sp. is narrowing towards apex, the bulb-like raised areas medially on basal part of elytra are larger and more elevated in P. nylanderi  nov. sp. than in P. wheatcrofti  comb. nov., and the lateral spines on pronotum are acutely projecting upwards in P. nylanderi  nov. sp. This new species is only known from the eastern parts of Papua New Guinea (Morobe Province and Okapa Province) ( Fig. 81View FIGURE 81).

Etymology. This species is named in honour of our friend and colleague Ulf Nylander who kindly offered his collected specimens, including the new species, of Potemnemus  from Papua New Guinea to be included in this work.


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