Orcus nietzschei, Łączyński, 2012

Łączyński, Piotr, 2012, On the genus Orcus Mulsant with descriptions of new species (Coleoptera: Coccinellidae: Chilocorini), Journal of Natural History 46 (39 - 40), pp. 2401-2414 : 2407-2410

publication ID	https://doi.org/ 10.1080/00222933.2012.707244
persistent identifier	https://treatment.plazi.org/id/AD72A825-FFE1-DA41-FDA4-FA0AFBB6A3CA
treatment provided by	Carolina
scientific name	Orcus nietzschei
status	sp. nov.

Treatment

Orcus nietzschei sp. nov.

( Figures 2 View Figure 2 E–I, 3B, 4)

Material

Holotype male. “ New Guinea: (NE), Bulolo 1020 m, 21 August 1956 / B.J. Ford, Jr. Collector ” ( BPBM).

Paratypes. “ New Guinea: NE, Wau , Morobe Distr., Mt Missim 1000 m, 26 August 1961 / J.M. Sedlacek Collector, Bishop” (1: BPBM) ; “ New Guinea: NE, Wau, Morobe Distr., 1200 m, 23 June 1961 / J.M. Sedlacek Collector ” (1: BPBM) ; “ New Guinea: NE, Wau, 1200–1300 m, 13–24 March 1969 ” (3: BPBM) ; “ New Guinea: NE, Wau, Kujeru, 1310 m, 27 September 1969 / Abid Beg Mirza Collector” (1: BPBM) ; ” New Guinea, Bulolo, 700 m, 26 November 1969 /. M. Sedlacek Collector, Bishop Museum” (1: BPBM) ; “ New Guinea: (NE), Bulolo, 900–1200 m, 17–30 August 1956 / B.J. Ford, Jr. Collector ” (10: BPBM) ; “ New Guinea: NE, Finisterre Range , Saidor : Kiambavi, Jul–Aug 1958 / W.W. Brandt Collector ” (1: BPBM) ; “ New Guinea: (NE), Sakalang, Salawakot, 10 September 1956 / B.J. Ford, Jr. Collector ” (1: BPBM) .

Diagnosis

This species is similar to Orcus biroi , but is easily distinguished by the predominantly bluish elytra with green metallic reflection.

Description

Length 2.85–3.02 mm; TL / EW 1.07–1.10; PL / PW 0.26–0.30; EL / EW 0.89–0.91.

Body ( Figures 2E View Figure 2 , 3B View Figure 3 ) rounded and convex, pronotal margins moderately broad; elytral margins moderately explanate. Head and pronotum orange; labrum, ventral mouthparts and antennae blackish. Scutellum black. Elytra predominantly light bluish, darker along suture with strong greenish metallic reflection. Punctures on pronotum 1.0–1.5 diameters apart, moderately coarse and deep; punctation on elytra slightly sparser, with very deep punctures about as large as eye facets or slightly larger, 1.5–2.0 diameters apart. Ventral surface black.

Head flat medially, weakly punctate, covered with rather sparse and short setae. Clypeus ( Figure 2F,G View Figure 2 ) strongly emarginate anteriorly. Eyes ( Figure 2G View Figure 2 ) moderately large, finely faceted, dorsally separated by about 2.0 times width of eye; interocular distance about 0.48 times head width; inner margins of eyes slightly rounded, convergent anteriorly. Maxilla with terminal palpomere ( Figure 2F View Figure 2 ) about 2.2 times longer than wide, outer margin about 2.4 times as long as inner, subparallel along basal half, tapering apically. Labium with terminal palpomere ( Figure 2F View Figure 2 ) at base about 0.85 times as wide as penultimate at apex. Antenna ( Figure 2H View Figure 2 ) composed of nine antennomeres, antennomere 9 as long as antennomere 8 and tapering to apex.

Prothorax about 0.82 times basal width of elytra; pronotal base bordered; pronotal hypomeron with fovea vestigial; prosternum smooth; prosternal process ( Figure 2F View Figure 2 ) truncate at apex, at middle about 0.24 times as wide as longer procoxal diameter; prosternum in front of coxae about 0.95 times as long as procoxal longitudinal diameter. Mesoventral intercoxal process ( Figure 2I View Figure 2 ) about 0.95 times mesocoxal longest diameter, covered with sparse short hair; meso-metaventral junction almost straight. Metaventrite ( Figure 2I View Figure 2 ) with complete discrimen; postcoxal lines weakly arcuate laterally, joined at middle, before junction each recurving posteriorly.

Elytral epipleuron ( Figure 2E View Figure 2 ) with maximum width at metaventrite, narrowing posteriorly but complete to apex, with foveae vestigial.

Legs moderately stout; tarsal claw with distinct, subtriangular basal tooth.

Abdomen ( Figure 4A,D View Figure 4 ) with six ventrites in male, five in female; postcoxal lines of first ventrite joined at middle, posteriorly almost reaching hind margin of ventrite I and weakly recurving anteriorly; ventrite I along midline about 2.6 times longer than ventrite II; ventrite V with apical margin strongly emarginate in male, rounded in female. Abdominal segment VIII ( Figure 4B,C View Figure 4 ) with sternite emarginate medially in male, rounded in female. Male genital segment as in Figure 4F View Figure 4 .

Male genitalia ( Figure 4E,I,J View Figure 4 ). Penis guide distinctly shorter than parameres; apex of penis as in Figure 4J View Figure 4 .

Female genitalia ( Figure 4G,H View Figure 4 ). Coxites triangular; sperm duct consists of two parts of almost same diameter; spermatheca ( Figure 4H View Figure 4 ) with distinct additional gland. Infundibulum proper absent ( Figure 4G View Figure 4 ), but bursal appendix present in the form of a sclerotized spur.

Distribution

Papua New Guinea.

Etymology

This species is dedicated to the memory of a great German philosopher, Friedrich Nietzsche, who devoted his life to understanding the nature of will and morality.