Dineutus (Rhombodineutus) sinuaticollis Zimmerman, 1924

Polhemus, Dan A., 2011, New distributional records for Gyrinidae (Insecta: Coleoptera) on New Guinea and nearby islands, with a checklist of the New Guinea species, Zootaxa 2900, pp. 51-68 : 58

Dineutus (Rhombodineutus) sinuaticollis Zimmerman, 1924

Fig. 4

Dineutes sinuaticollis Zimmerman, 1924: 2 .

Dineutus (Rhombodineutus) sinuaticollis: Ochs, 1926: 140 .

Material examined. INDONESIA, Papua Prov. [= former Irian Jaya Prov.]: 1 male, 1 female, Wapoga River basin, Tirawiwa River and overflow channel at abandoned Wapoga Timber Company camp, 2.0 km. S. of PTFI Siewa exploration camp, 60 m. [200 ft.], 3°03'20"S, 136°23'31"E, water temp. 27° C., 10 April 1998, 08:30–11:30 hrs., CL 7094, D. A. Polhemus ( USNM); 8 males, 15 females, Wapoga River basin, Logari River and tributaries at PTFI Landing Site 21, 290 m. [950 ft.], water temp. 24° C. (main river), 7 April 1998, 09:00–14:00 hrs.; 3°00'21"S, 136°33'21"E, CL 7092, D. A. Polhemus ( USNM); 3 males, 4 females, Wapoga River basin, rocky tributary to Logari River, approx. 0.5 km. W. of PTFI Landing Site 21, 295 m. [970 ft.], 3°00'27"S, 136°33'14"E, water temp. 25° C., 6 April 1998, 12:30–14:30 hrs., CL 7091, D. A. Polhemus ( USNM).

Discussion. As with Dineutus (Rhombodineutus) heurni , this species was described from material collected by the Archbold Expeditions in the mountains to the south of the Idenberg River in west-central New Guinea. New collections now extend the range of this species westward into the Wapoga River Basin ( Fig. 4 ), where it occurs at elevations slightly lower than those at which D. heurni was encountered (see Table 1).

For ecological notes on this species see the discussion under D. heurni , with which this species is occasionally syntopic at elevations below 300 m. Based on known collections, this species occupies the Mamberamo Foreland area of freshwater endemism (Area 17) as defined by Polhemus & Allen (2007).

This species, in combination with Dineutus (Rhombodineutus) tetracanthus tetracanthus and Dineutus (Rhombodineutus) heurni , was grouped under the composite listing of “ Rhombodinetus sp. undet.” from Station 50 in Polhemus (2000).

Figures

FIGURE 4. Distribution of certain Dineutus (Rhombodineutus) species and subspecies on New Guinea. Symbols with grey centers represent previous records; symbols with black centers represent new records presented in this paper.