Potemnemus thomsoni Lansberge 1880
Creators: name: Wallin, Henrik
name: Kvamme, Torstein
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Cerambycidae
Potemnemus
Potemnemus thomsoni

description: Potemnemus thomsoni Lansberge, 1880: 138 sp. res.
Figs. 21, 81.
Notes. Protemnemus thomsoni Lansberge (1880) is a misspelling.
Examined specimens: HT ♂ MNHN (photo examination), BL = 45.0 mm, Indonesia, Papua, Mount Arfak, leg. J. Thomson (1828–1897) & M. Bruyn,
Morphological characteristics. A large and robust species (BL = 45.0 mm) with body approximately 3.5 x longer than wide (Fig. 21). Antennae: very long in the HT male, extending beyond apices by about six antennomeres. Thorax: pronotum is smooth and supplied with a longitudinal whitish and narrow band interrupted medially with a dark brown spot surrounded by whitish pubescence. The preapical transverse groove (or impression) medially across entire pronotum is oblique. Elytra: sub-parallel with 2/3 of anterior surface flattened medially. Covered with light brown and very dense pubescence. A mixture of small and large, glabrous granules are concentrated around the slightly raised and bulb-like area anteriorly. The black lateral carina distinct and smooth, and distinctly curved inwards towards apex before apical 1/3 of elytra. Legs: strongly mottled with white pubescence.
Remarks. The concentration of large granules at the anterior part of elytra in P. thomsoni sp. res. resembles to some extent P. tuberifer, P. wheatcrofti comb. nov. and P. nylanderi nov. sp. The distinct lateral carina curved towards the middle of each elytron 1/3 before apex is, however, unique to P. thomsoni sp. res. and P. tuberifer. P. thomsoni sp. res. is easily separated from P. tuberifer by the light brownish colour and much more elongated elytra, which are flattened medially. P. t h om s on i sp. res. is only known from the HT ♂ found in the Arfak Mountains (Bird´s Head Peninsula) on the western part of the island of New Guinea (Fig. 81).
Potemnemus trimaculatus Lea, 1918: 98 sp. res. Figs. 7, 8, 9, 46, 55, 56, 57, 58, 81.
Potemnemus detzneri Kriesche, 1923: 428 nov. syn. (assumed to be a synonym by Breuning (1944), but not formalized).
Notes. P. trimaculatus Lea, 1918 was synonymized by De Jong (1947). Protemnemus trimaculatus Lea, 1918 is a misspelling.
Examined type specimen. HT ♂ SAM, BL = 38.0 mm (photo examination) Australia, Queensland, Coen River;
Other specimens examined. Papua New Guinea: 1♂ CUN, BL = 42.8 mm, Morobe Province (MP), Aseki, 1990.03; 1♀ CHW BL = 38.7 mm, MP, Aseki, Hanyauyeto Village, 2008.04.25-30; 1♀ CUN, BL = 47.0 mm, MP, Bulolo, 1990.03; 1♀ CUN, BL = 45.5 mm, MP, Aseki, 1991.07, leg. Clark; 1♀ CUN, BL = 47.4 mm, MP, Aseki, Pawamanga Village, 2005.06.15; 1♀ CUN, BL = 43.0 mm, MP, Aseki, 2004.06.0 1, leg. M. Hudson; 1♂ CUN, BL = 35.5 mm, BW= 11.0 mm, MP, 2005.05.17, M. Hudson leg.; 1♀ CUN, BL = 45.0 mm, MP, Aseki, 1992.10; 1♂ CHW, BL = 48.0 mm, MP, Kapiro Village, 1995.10.13; 1♂ CHW, BL = 44.0 mm, MP, Kapiro Village, 1995.02.29; 1♂ NHRS, BL = 30.0 mm, labelled Alt. Erima, D.N. Guinea; 1♂ NHRS, BL = 36.0 mm, labelled D.Neu Guinea; 1♂ IRSNB, BL = 45.0 mm, D.N. Guinea, leg. I., Fergusson; 1♀ IRSNB, BL = 40.0 mm, D.N. Guinea; 1♂ IRSNB, BL = 44.0 mm, D.N. Guinea, leg. I., Fergusson; 1♀ IRSNB, BL = 45.0 mm, D.N. Guinea, leg. I., Fergusson; 1♂ IRSNB, BL = 37.0 mm, D.N. Guinea (ex. coll. Fruhstorfer); Indonesia: 1♀ CUN, BL = 49.0 mm, Halmahera, Baru-Basale, Talugarama 550 m, 1997.03.0 5, leg. P. Suhanda.
P. detzneri Kriesche, 1923: 428 nov. syn.
Examined type specimen: HT ♀ MNHUB, BL = 48.0 mm, Papua New Guinea, Morobe Province, Sattelberg (near Finschhafen on the Huon Peninsula).
Notes. Although both a female and a male specimen deposited at MNHUB are labelled Type and HT, we consider the female specimen to be the HT. The original description and labelling data for the female agrees with the HT ♀.
Re-description. a large and relatively broad species (BL = 30.0–49.0 mm, BW 11.0 mm) with body approximately 3.0 x longer than wide (Figs. 7–9). The body is compressed dorso-ventrally (Fig. 9). Antennae: relatively long in both sexes, extending beyond apices by about 4–5 antennomeres. The last antennomere in males is about 1.3 x longer than the penultimate. Thorax: the median patch on pronotum is divided by a narrow and longitudinal ochreous line. There are two conical tubercles medially on pronotum with a glabrous and shining oval area between them. The oval area is sometimes slightly raised, but do not reaching the height of the two lateral tubercles. The surface on pronotum below the median tubercles is smooth (Fig. 46). Elytra: ochreous or rarely greyish. The epipleurons towards humeri are dark brown, with similar colour as the three patches dorsally on elytra. One brown triangular patch surrounds scutellum and is extended along the suture, and the two brown patches are posteriorly towards apex. The elevated transverse ridge on the middle of each elytron is oblique. Spines mainly scattered along lateral carina (rarely on elytra) are relatively fine. Spines surrounding the triangular patch around scutellum are blunt or rounded. Legs: relatively long and weakly mottled with brownish and greyish pubescence. Venter: prosternal process with a large broad, pubescent and rounded tubercle anteriorly. An exception is the examined female from Halmahera that has a completely rounded mesoventrite anteriorly. Mesosternum with a small, white patch laterally. Venter with short, brownish pubescence. Male genitalia: aedeagus is about 8.0 mm long and strongly curved towards apex (Fig. 55), with dorsal surface smooth and shining (Fig. 56). Parameres broad and about 3.5 mm long, strongly narrowing towards anterior margin, inner margin straight with lateral margin strongly narrowing towards apex, with relatively long setae attached dorsally and ventrally, and the projection at base (between the two parameres) sharp and pointing (Fig. 57). Tergite VIII about 3.5 mm long, triangularly shaped with a rounded apex, anterior margin covered with relatively fine and short setae, and the surface with fine and densely pubescent (Fig. 58). The colour of male genitalia is yellowish.
Remarks. P. trimaculatus sp. res. is most similar to P. scabrosus but is easily separated by the more flattened body dorso-ventrally, the more elongated elytra, the presence of a distinct brown patch medially on pronotum and the extended and triangular patch surrounding scutellum. P. trimaculatus sp. res. is also a widespread species occurring in the Moluccas and on the western and eastern parts of the island of New Guinea (Fig. 81).
description: Published as part of 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, pp. 501-542 in Zootaxa 4040 (5) on pages 521-522, DOI: 10.11646/zootaxa.4040.5.1, http://zenodo.org/record/239016