Naucoris sigaloeis La Rivers, 1974

Polhemus, Dan A. & Polhemus, John T., 2013, Guide To The Aquatic Heteroptera Of Singapore And Peninsular Malaysia. Xi. Infraorder Nepomorpha- Families Naucoridae And Aphelocheiridae, Raffles Bulletin of Zoology 61 (2), pp. 665-686 : 670

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Naucoris sigaloeis La Rivers, 1974


Naucoris sigaloeis La Rivers, 1974

( Figs. 1–4 View Fig View Figs , 13 View Figs )

Naucoris sigaloeis La Rivers, 1974: 4

Extralimital material examined. — THAILAND, Nakhon Sawan Prov.: 2 males, 1 female, Bung Borapet , Sep.1971, coll. J. K (paratypes, JTPC) . Nakhon Ratchasima Prov.: 5 male, 5 females, Sakaerat Exp. Station, 60 km S. of Nakhon Ratchasima , 300–600 m, 14°30'N, 101°55'E, 2–4 Mar.1971, coll. P. & P. Spangler ( USNM) GoogleMaps . Khon Kaen Prov.: 1 female, Ubolratana Dam, 20 km W. of Mae Nam Pong , 16°46'30"N, 102°36'30"E, 10 Mar.1971, coll. P. & P. Spangler ( USNM) GoogleMaps . Prov. uncertain : 1 male, NE Thailand , 10 Jan.1953, FN 537, coll. M. E. Griffith ( JTPC) . VIETNAM, Dông Nai Prov.: 4 males, 3 females, Nam Cát Tiên National Park, Crocodile Lake , ~ 100 m, 11°27'25"N, 107°20'58"E, 5 May 1998, CL 3071, coll. J. T. Polhemus ( JTPC) GoogleMaps .

Diagnosis. — Length 7.0– 8.2 mm, maximum width (across abdomen) 4.2–4.5 mm ( Fig. 1 View Fig ). Head and pronotum shiny, yellowish brown with numerous scattered, small, medium brown spots, these spots aggregated in posteriomedial section of pronotum to form larger medium brown maculations to either side of longitudinal midline, anterior pronotal margin with a small brown spots medially, lateral margins of pronotum not explanate, lacking darker markings; scutellum and hemelytra yellowish brown, heavily flecked with medium brown with basal half of embolium broadly dark yellow, wing membrane attenuated, dark brown; abdominal laterotergites dark yellow on anterior two-thirds, dark brown on posterior one-third, creating a striped appearance. Male genitalia with left paramere stout, apex blunt ( Fig. 2 View Figs ), right paramere slender, twisted, apex rounded, phallotheca as in Fig. 4 View Figs ; female subgenital plate elongate, roughly trapezoidal, apex truncate ( Fig. 13 View Figs ).

Distribution. — Originally described from Bung Borapet, Thailand, and newly recorded from Vietnam herein.

Discussion. — This species may recognised by its relatively large size for the genus, shiny head and pronotum, absence of explanate lateral margins on the pronotum ( Fig. 1 View Fig ), the reduced wing membrane of the hemelytra, the shape of the female subgenital plate ( Fig. 13 View Figs ), and the distinctive male genitalic structures ( Figs. 2–4 View Figs ). This shiny, chestnut brown species is known from Thailand and Vietnam, and may also possibly occur in the extreme northern portion of Peninsular Malaysia. It has been collected from both lotic and lentic habitats, including slow stream pools and shallow, standing waters along the margins of lakes, including the Crocodile Lake in southern Vietnam and Bung Borapet in Thailand.


Colorado Entomological Museum (formerly John T. Polhemus collection)


Smithsonian Institution, National Museum of Natural History


Tavera, Department of Geology and Geophysics














Naucoris sigaloeis La Rivers, 1974

Polhemus, Dan A. & Polhemus, John T. 2013

Naucoris sigaloeis

La Rivers, I 1974: 4
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