Genyocerus papuanus Roberts, 1993

Beaver, R. A. & L. - Y, 2007, A review of the genus Genyocerus Motschulsky (Coleoptera: Curculionidae: Platypodinae), with new synonyms and keys to species, Zootaxa 1576 (1), pp. 25-56 : 37-38

publication ID	https://doi.org/ 10.11646/zootaxa.1576.1.3
publication LSID	lsid:zoobank.org:pub:C0ED40AA-840D-4950-B8D6-7CE87870D64B
persistent identifier	https://treatment.plazi.org/id/842B6D7D-FFF0-FFD6-FF67-9A2A53BEBC35
treatment provided by	Felipe
scientific name	Genyocerus papuanus Roberts
status

Treatment

Genyocerus papuanus Roberts View in CoL

( Figs 19 View PLATE 6 –22)

Genyocerus papuanus Roberts, 1993: 27 View in CoL .

Taxonomy: We have examined the holotype male, allotype female and a female paratype ( BPBM) from Papua New Guinea and compared them with a series of males collected in Indonesia: Papua Barat (formerly Irian Jaya) ( NKME). The available material suggests that the species occurs in two size classes. The holotype male from Papua New Guinea ( BPBM) and nine males ( NKME) from Indonesia: Papua Barat are 4.5–4.8 mm long; two further males ( NKME) from a second locality in Papua Barat (about 100 km distant from the first, but in a different river basin) are 5.5 and 5.7 mm long. The smaller males have a total of 8–9 mycangial pores; the larger males have 14–17. We are unable to find any other significant differences between the two groups of males. Although the size difference suggests reproductive isolation, it would be premature to describe the larger males as a distinct species, because intermediates may yet be found (as in G.quadriporus (see below)). Roberts (1993) suggests that the male can be distinguished from G.biporus by the hair ornamentation of the lower part of the frons. However, the basic arrangement of hairs in four longitudinal rows is the same in both species. Alternative distinguishing characters are given in the keys above.

Distribution: Known only from the island of New Guinea ( Indonesia: Papua Barat, and Papua New Guinea).

New Records: INDONESIA, Irian Jaya, Nabire area, road Nabire-Ilaga , km 62, 03 o 30'936''S,

135 o 41'945''E, 250m NN, LEK, X.1997 (M. Balke) (9 ♂) ( NKME, RAB) (all smaller form); Wapoga River , E

Asori, km 64, Kwadewa camp, 2 o 49'S, 136 o 28'E, 10.i.1999 (A. Weigel) (2 ♂) ( NKME, RAB) (larger form). Biology: The only recorded host is Anisoptera sp. (Dipterocarpaceae) ( Roberts 1993).