Enithares bakeri Brooks, 1948

Polhemus, Dan A., 2020, Nine new species of Enithares (Heteroptera: Notonectidae) from New Guinea, with distributional notes on other species and an updated world checklist, Zootaxa 4772 (1), pp. 132-182 : 165

Enithares bakeri Brooks

( Figs. 39 , 56, 57 , 63 )

Enithares bakeri Brooks 1948 . J. Kansas Entomol. Soc., 21: 40, fig. 3. Holotype, male, Philippines, Mindanao , Surigao, in USNM.

Enithares bakeri, Lansbury 1968 . Pac. Ins., 10: 384–385, figs. 91–95. Redescription, distribution.

Enithares bakeri, Nieser & Chen 1991 . Tijdschr. Entomol., 134: 59. Distribution.

Material examined. INDONESIA, Irian Jaya Prov. [Papua Prov.], New Guinea : 1 male, swamp forest pond S. of Walio oil field, nr. Kasim , 7 m ., [1°25′18′′S, 131°05′22′′E], water temp. 30° C., 29 September 1991, CL 2620, D. A . Polhemus and J. T. Polhemus ( BPBM) ; 1 female, artificial pond 3 km. E. of Klagalo River at old Klagagi oil field, SE of Sorong, 80 m ., [0°55′14′′S, 131°25′23′′E], water temp. 28.5° C., 1 Oct. 1991, CL 2625, D. A . Polhemus and J. T. Polhemus ( BPBM) ; 3 males, 4 females, artificial pond at old Klagana oil well drill site, SE of Sorong, 300 m ., [0°57′26′′S, 131°25′44′′E], water temp. 29° C., 1 Oct. 1991, CL 2629, D. A . Polhemus and J. T. Polhemus ( BPBM) ; 1 male, Aimasi River , 60 km. SW of Manokwari, 90 m ., [0°53′36′′S, 133°51′18′′E], water temp. 26.5° C., 19 Octo- ber 1991, CL 2651, D. A . Polhemus and J. T. Polhemus ( BPBM) . Maluku Utara Prov.: 1 male, Obi Is., 12 km. SW of Jikodolong , on logging road, [~ 225 m., vic. 1°31′05′′S, 127°29′52′′E], 5 August 1981, A . C. Messer ( USNM) ; 3 males (1 dissected), 2 females, Halmahera Is., Wasile District , Kampung Labi-Labi, [~ 50 m., vic. 1°27′50′′S, 128°20′58′′E], 27 March 1981, A . C. Messer and P. M. Taylor ( USNM, BPBM) ; 6 males, 10 females, Morotai Is., Sabatai Tua, 17 km. N. of Daruba, [~ 20 m., vic. 2°03′35′′S, 128°24′08′′E], 2 September 1981, A . C. Messer ( USNM, BPBM) . Sulawesi Selatan Prov.: 1 male, 1 female, Kab. Maros, Kec. Camba, Marana River nr. Laiya , 50 km. E. of Maros , 450 m ., 14 October 1985, [vic. 5°02′54′′S, 119°46′56′′E], 14 October 1985, CL 2167, D. A . Polhemus & J. T. Polhemus ( USNM, BPBM) . Sulawesi Tengah Prov.: 1 male, 1 female, pond 1 km. SE of Kamarora, Lore Lindu National Park, [~ 670 m., vic. 1°11′28′′S, 120°10′10′′E], 8 October 1985, CL 2158, D. A . Polhemus & J. T. Polhemus ( USNM, BPBM) . Nusa Tenggara Barat Prov.: 1 male, 1 female, Flores, Lake Rene Mese , 21.5 km. SE of Ruteng on Mborong road, 1225 m., [8°38′26′′S, 120°33′38′′E], 23 October 1985, CL 2178, D. A . Polhemus & J. T. Polhemus ( USNM, BPBM) ; 1 male, 1 female, Lombok, Aik Jut River, 1 km. N. of Sesaot , 30 km. NE of Mataram, 150 m ., [8°38′26′′S, 120°33′38′′E], 25 October 1985, CL 2183, D. A . Polhemus & J. T. Polhemus ( USNM, BPBM) .

Nusa Tenggara Timur Prov., Timor: 1 male, upland marsh and spring at Oelki, 5 km. W. of Niki Niki, 840 m., [9°50′28′′S, 124°26′58′′E], water temp. 25° C. (marsh), 23° C. (spring), 12 Sept. 1991, CL 2595, D. A . Polhemus and J. T. Polhemus ( BPBM). EAST TIMOR, Lautem Dist.: 1 male, Tchino River at bridge, 10.5 km. S. of Lospalos on Iliapa road, 105 m., 8°35′20′′S, 126°59′40′′E, water temp. 29 °C., 20 November 2003, 08:30–11:00 hrs., CL 7277, D. A . Polhemus ( USNM, BPBM) .

Discussion. The illustrations in Lansbury (1968) do not adequately depict the set of stout, spine-like setae at the apex of the PL in E. bakeri , which are a good spot character for the species ( Fig. 39 ). In addition, this species has a row of small but evident black spines on the posterior margin of the hind trochanter that are also helpful in diagnosis and serve to distinguish it from E. loria , E. megalops , and E. paramegalops , which lack such spines but are of similar body sizes, and possess geographic distributions that are overlapped by the broad range of E. bakeri .

Ecological notes. This is perhaps the most widespread of any Enithares species occurring on the islands of Southeast Asia. It was originally described from Mindanao, with additional records from Celebes and Borneo ( Lansbury 1968, Nieser & Chen 1996). Subsequent collections have shown that the species is widespread in the Philippines, occurring on Mindoro, Marinduque, Negros, Siquijor, Biliran, and in the Camotes Group (Zettel 2003). The records presented here appear to be the first for New Guinea, Lombok, Flores, Timor, Halmahera and Obi islands, and extend the range of this species considerably to the south and east ( Fig. 63 ). Within the island of New Guinea itself, this species appears on the basis of present records to be confined to the Vogelkop Peninsula, occurring in both the Vogelkop Lowlands and Vogelkop Highlands areas of freshwater endemism (Areas 4 and 5) as defined by D. Polhemus & Allen (2007). Further to the east, in the main body of New Guinea, it appears to be replaced by E. loria in similar habitats.

Figures

FIGURE 63. Distribution of species in the E. atra and E. bakeri groups on New Guinea and nearby islands. Circles = E. bakeri Brooks, square = E. bosavi, triangles = E. loria Brooks.

FIGURES 35–40. Enithares species in the E. atra and E. bakeri groups, male genitalic complex, left lateral view. 35. Enithares elongata Lansbury; specimen from Papua New Guinea, Morobe Prov., Wareo. 36. Enithares ziwa n. sp.; specimen from Indonesia, Papua Prov., Ziwa River, CL 7100. 37. Enithares stylata Lansbury; specimen from Papua New Guinea, Morobe Prov., Wau, CL 1817. 38. Enithares tagula n. sp.; specimen from Papua New Guinea, Milne Bay Prov. Tagula Is., CL 7190. 39. Enithares bakeri Brooks, specimen from Indonesia, West Papua Prov., Aimasi River, CL 2651. 40. Enithares loria Brooks; specimen from Indonesia, Papua Prov., Siewa, CL 7085.

FIGURES 56–62. Enithares species in the megalops and bakeri groups, dorsal habitus photographs. 56–57. Enithares bakeri Brooks; male specimen from Indonesia, Nusa Tenggara Timur Prov., Timor, Niki Niki, CL 2595, male specimen from Indonesia, West Papua Province, Kasim, Is., CL 2620. 58–59. Enithares vulgaris Lansbury, male and female; specimens from Indonesia, West Papua Province, Biak Is., CL 7039. 60–61. Enithares nigra n. sp., male and female; specimens from Indonesia, West Papua Province, Etna Bay, CL 7081. 62. Enithares loria Brooks, male; specimens from Indonesia, Papua Province, Siewa, CL 7085.