Exocelina larsoni (Balke, 1998)

Shaverdo, Helena, Surbakti, Suriani, Warikar, Evie L., Sagata, Katayo & Balke, Michael, 2019, Nine new species groups, 15 new species, and one new subspecies of New Guinea diving beetles of the genus Exocelina Broun, 1886 (Coleoptera, Dytiscidae, Copelatinae), ZooKeys 878, pp. 73-143 : 73

14. Exocelina larsoni (Balke, 1998) Figs 35 , 40

Copelatus (Papuadytes) larsoni Balke, 1998: 332; Nilsson 2001: 77 (catalogue).

Papuadytes larsoni (Balke, 1998): Nilsson and Fery 2006: 56 (comb. nov.).

Exocelina larsoni (Balke, 1998): Nilsson 2007: 34 (comb. nov.).

Exocelina larsoni MB1299: Toussaint et al. 2014: supplementary figs 1-4, tab. 2; Toussaint et al. 2015: supplementary figs S1, S2, tab. S3, and information S5, S6.

Type locality.

Papua New Guinea: Madang Province, Baiteta, 05°01'00"S, 145°45'00"E, ca. 700 m a.s.l.

Type material studied.

Paratypes: 2 males "PAPUA NEW GUINEA Baiteta March 13, 1991 D. J. Larson" (NHMW). Note: According to the original description ( Balke 1998), the holotype is deposited in the collection of D. Larson and is in the Australian National Insect Collection now. The holotype was not studied since the species is very characteristic and two paratypes from the same locality were examined.

Additional material.

Madang: 7 males, 2 females "Papua New Guinea: Madang Province, Wanang village, ca 110 m, 20.ix.2013, 05.15.458S 145.02.389E, David Boukal (PNG2013-13)" (NHMW, ZSM). 4 males, 5 females "Papua New Guinea: Madang Province, Wanang village env., Wanang conservation area, 250 m, 21.ix.2013, 05.15.458S 145.02.389E, David Boukal (PNG2013-20)" (NHMW, ZSM). 1 male "Papua New Guinea: Madang Province, Wanang village env., Wanang conservation area, 250 m, 22.ix.2013, 05.15.458S 145.02.389E, David Boukal (PNG2013-24)" (NHMW). 1 female "Papua New Guinea: Madang Province, Wanang village env., Wanang conservation area, 250 m, 22.ix.2013, 05.15.458S 145.02.389E, David Boukal (PNG2013-31)" (NHMW). 16 males, 4 females "Papua New Guinea: Madang Province, Wanang village env., Wanang conservation area, 250 m, 23.ix.2013, 05.15.458S 145.02.389E, David Boukal (PNG2013-33)" (NHMW, ZSM). 8 males, 11 females "Papua New Guinea: Madang Province, Wanang village env., Wanang conservation area, 250 m, 23.ix.2013, 05.15.458S 145.02.389E, David Boukal (PNG2013-37)" (NHMW, ZSM). 2 males, 1 female "Papua New Guinea: Madang Province, Wanang village env., Wanang conservation area, 250 m, 24.ix.2013, 05.15.458S 145.02.389E, David Boukal (PNG2013-39)" (NHMW). 33 males, 3 females "Papua New Guinea: Madang Province, Wanang village env., Wanang conservation area, 250 m, 25.ix.2013, 05.15.458S 145.02.389E, David Boukal (PNG2013-44)" (NHMW, ZSM). 4 males, 1 female “V.Kolář Lgt. Papua New Guinea Wanang III 4 –20.7.2013” (NHMW). 1 female "Ibisca Niugini, PNG 18-20.xi.2012 Wanang -5,227670193 145,0797424 ", "FIT-WAN-G-1/8-d01 / Plot 7 / P0596 Vial 22305-CODYTI" (ZSM). 1 male "Ibisca Niugini, PNG 20-22.xi.2012 Wanang -5,227670193 145,0797424 ", "FIT-WAN-P-2/8-d04 / Plot 16 / P0669 Vial 22273-CODYTI" (ZSM). 1 female "Ibisca Niugini, PNG 24-26.xi.2012 Wanang -5,227670193 145,0797424 ", "FIT-WAN-H-4/8-d07 / Plot 8 / P0607 Vial 17640-CODYTI" (ZSM). 1 male "Ibisca Niugini, PNG 30.x.-2.xii.2012 Wanang -5,227670193 145,0797424 ", "FIT-WAN-L-7/8-d14 / Plot 12 / P0642 Vial 17744-CODYTI" (ZSM). 1 female "Ibisca Niugini, PNG 2-4.xii.2012 Wanang FIT-WAN-D-8/8-d15 / Plot 4 / P0579 Vial 17568-CODYTI" (ZSM). 3 males "Papua New Guinea: Madang, below Bundi, 500 m, 26.IX.2002 Balke & Sagata (PNG 023)", one of them with an additional green label "269 DNA M Balke" and "sp 24 SEM 19" (ZSM). 5 males, 3 females "Papua New Guinea: Madang, Brahmin, 150 m, 26.IX.2002 Balke & Sagata (PNG 024)", two of males with additional green labels "274 DNA M Balke", "275 DNA M Balke" (NHMW, ZSM). 1 male "Papua New Guinea: Madang, Adalbert [sic!] Mts., Keki, 850m, 4.v.2006, nr 04.42.300S 145.25.089E, Manaono leg. (PNG 52)" (ZSM). 2 males, 5 females "Papua New Guinea: Madang, Adalbert [sic!] Mts., creek nr Keki, 790m, 28.xi.1994, 04.42.300S 145.25.089E, Binatang Boys leg. (PNG 53a)" (ZSM). 1 male, 1 female "Papua New Guinea: Madang, Adalbert Mts., Keki to Sewan, 650m, 7.v.1994, 04.41.802S 145.25.460E, Balke (PNG 54)", male with an additional green label "DNA M.Balke 1299" (ZSM). 16 males, 8 females "Papua New Guinea: Madang, Usino, 260m, 15.iii.2007, 05.31.125S 145.25.316E, Kinibel (PNG 158)", one male with an additional green label "DNA M. Balke 3307" (NHMW, ZSM). 1 male, 1 female "Papua New Guinea: Madang, Mt. Tapo, 180 m, ii.2008 5 24.11.00 S 145 36 17 16 E, BRC leg. (PNG 178)" (ZSM). 4 males, 8 females "Papua New Guinea: Madang, Wannang, 270m 31.x.2008, 05.15.458S 145.02.389E, Posman, (PNG187)" (ZSM). 17 males, 25 females "Papua New Guinea: Madang, Wannang, 230m 3.x.2008, 05.17.235S 145.06.160E, Posman (PNG188)", three males additionally with green labels "DNA M.Balke 3763", "DNA M.Balke 3767", "DNA M.Balke 3768" (NHMW, ZSM). 2 males "Papua New Guinea: Madang, Akameku - Brahmin, Bismarck Range, 250-500m, 25.xi.2006, nr 05.47.026S 145.24.131E, Balke & Kinibel (PNG 115)", one of them with an additional green abel "DNA M.Balke 1363" (ZSM). 13 males, 22 females "Papua New Guinea: Madang, Keki, Adalbert Mts., 500m, 29.xi.1994, 04.43.058S 145.24.437E, Balke & Kinibel (PNG 118)" (NHMW, ZSM). 38 males, 56 females "Papua New Guinea: Madang, Keki, Adalbert Mts., 400m, 29.xi.1994, 04.43.058S 145.24.437E, Binatang Boys, (PNG 119)" (NHMW, ZSM). 60 males, 97 females "Papua New Guinea: Madang, Keki-Sewan, Adalbert Mts., 700m, 30.xi.1994 nr 04.41.802S 145.25.460E Binatang Boys (PNG 120)" (NHMW, ZSM). 7 males, 8 females "Papua New Guinea: Madang, Keki-Sewan, Adalbert Mts., 300m 30.xi.1994, 04.40.558S 145.27.187E, Binatang Boys, (PNG 121)" (ZSM). 1 female "Ibisca Niugini, PNG 25-27.x.2012 Mount Wilhelm 700m -5,731960773 145,2521667 ", "FIT-MW700-C-1/8-d01 / Plot 3 / P1114 Vial 16039-CODYTI" (ZSM). 1 male "Ibisca Niugini, PNG 26-28.x.2012 Mount Wilhelm 700m FIT-MW700-O-1/8-d02 / Plot 1 / P1210 Vial 16172-CODYTI" (ZSM). 4 females "Ibisca Niugini, PNG 26-28.x.2012 Mount Wilhelm 700m -5,731960773 145,2521667 MW0700 / P1210 Vial 16172" (ZSM). 1 male, 1 female "Ibisca Niugini, PNG 26-28.x.2012 Mount Wilhelm 700m", " -5,731960773 145,2521667 FIT-MW700-S-1/8-d02 / Plot 19 / P1242 Vial 16118-CODYTI" (ZSM). 2 males, 3 females "Ibisca Niugini, PNG 26-28.x.2012 Mount Wilhelm 700m -5,731960773 145,2521667 MW700 / P1234 Vial 16270" (ZSM). 1 female "Ibisca Niugini, PNG 27-29.x.2012 Mount Wilhelm 700m", " -5,731960773 145,2521667 FIT-MW700-A-2/8-d03 / Plot 1 / P1099 Vial 15960-CODYTI" (ZSM). 2 females "Ibisca Niugini, PNG 27-29.x.2012 Mount Wilhelm 700m", " -5,731960773 145,2521667 FIT-MW700-C-2/8-d03 / Plot 3 / P1115 Vial 15923-CODYTI" (ZSM). 1 male, 2 females "Ibisca Niugini, PNG 27-29.x.2012 Mount Wilhelm 700m -5,731960773 145,2521667 ", "FIT-MW700-A-2/8-d03 / Plot 1 / P1099 Vial 15958-CODYTI" (ZSM). 1 female "Ibisca Niugini, PNG 27-29.x.2012 Mount Wilhelm 700m -5,731960773 145,2521667 ", "FIT-MW700-G-2/8-d03 / Plot 7 / P1147 Vial 16042-CODYTI" (ZSM). 1 female "Ibisca Niugini, PNG 27-29.x.2012 Mount Wilhelm 700m -5,731960773 145,2521667 ", "FIT-MW700-H-2/8-d03 / Plot 8 / P1155 Vial 15976-CODYTI" (ZSM). 2 females "Ibisca Niugini, PNG 27-29.x.2012 Mount Wilhelm 700m -5,731960773 145,2521667 ", "FIT-MW700-E-2/8-d03 / Plot 5 / P1131 Vial 15937-CODYTI" (ZSM). 2 females "Ibisca Niugini, PNG 28-30.x.2012 Mount Wilhelm 700m -5,731960773 145,2521667 MW0700 / P1243 Vial 16156" (ZSM). 2 males, 5 females "Ibisca Niugini, PNG 28-30.x.2012 Mount Wilhelm 700m -5,731960773 145,2521667 MW700 / P1235 Vial 16164" (ZSM). 3 males, 5 females "Ibisca Niugini, PNG 28-30.x.2012 Mount Wilhelm 700m FIT-MW700-O-2/8-d0 / Plot 15 / P1211 Vial 16189-CODYTI" (ZSM). 1 female "Ibisca Niugini, PNG 30.x.-1.xi.2012 Mount Wilhelm 700m -5,731960773 145,2521667 MW0700 / P1252 Vial 15993" (ZSM). 1 female "Ibisca Niugini, PNG 1-3.xi.2012 Mount Wilhelm 700m -5,731960773 145,2521667 MW0700 / P1213 Vial 16236" (ZSM). 1 female "Ibisca Niugini, PNG 1-3.xi.2012 Mount Wilhelm 700m FIT-MW700-M-4/8-d08 / Plot 13 / P1197 Vial 15762-CODYTI" (ZSM). 1 female "Ibisca Niugini, PNG 2-4.xi.2012 Mount Wilhelm 700m -5,731960773 145,2521667 ", "FIT-MW700-A-5/8-d09 / Plot 1 / P1102 Vial 16027-CODYTI" (ZSM). 2 females "Ibisca Niugini, PNG 2-4.xi.2012 Mount Wilhelm 700m -5,731960773 145,2521667 ", "FIT-MW700-E-5/8-d09 / Plot 5 / P1134 Vial P1134-CODYTI" (ZSM). 1 female "Ibisca Niugini, PNG 3-5.xi.2012 Mount Wilhelm 700m -5,731960773 145,2521667 MW0700 / P1222 Vial 16098" (ZSM). 1 female "Ibisca Niugini, PNG 3-5.xi.2012 Mount Wilhelm 700m -5,731960773 145,2521667 MW0700 / P1254 Vial 16105" (ZSM). 1 female "Ibisca Niugini, PNG 3-5.xi.2012 Mount Wilhelm 700m FIT-MW700-M-5/8-d10 / Plot 13 / P1198 Vial 16087-CODYTI" (ZSM). 1 female "Ibisca Niugini, PNG 3-5.xi.2012 Mount Wilhelm 700m FIT-MW700-O-5/8-d10 / Plot 15 / P1214 Vial 16088-CODYTI" (ZSM). 1 male, 2 females "Ibisca Niugini, PNG 3-5.xi.2012 Mount Wilhelm 700m", " -5,731960773 145,2521667 FIT-MW700-R-5/8-d10 / Plot 18 / P1238 Vial 15969-CODYTI" (ZSM). 1 female "Ibisca Niugini, PNG 3-5.xi.2012 Mount Wilhelm 700m", " -5,731960773 145,2521667 FIT-MW700-K-5/8-d10 / Plot 11 / P1182 Vial 16083-CODYTI" (ZSM). 4 females "Ibisca Niugini, PNG 4-6.xi.2012 Mount Wilhelm 700m -5,731960773 145,2521667 ", "FIT-MW700-E-6/8-d11 / Plot 5 / P1135 Vial 07232-CODYTI" (ZSM). 2 males, 1 female "Ibisca Niugini, PNG 4-6.xi.2012 Mount Wilhelm 700m", " -5,731960773 145,2521667 FIT-MW700-A-6/8-d11 / Plot 1 / P1103 Vial 07195-CODYTI" (ZSM). 4 females "Ibisca Niugini, PNG 4-6.xi.2012 Mount Wilhelm 700m", " -5,731960773 145,2521667 FIT-MW700-C-6/8-d11 / Plot 3 / P1119 Vial 07081-CODYTI" (ZSM). 1 female "Ibisca Niugini, PNG 4-6.xi.2012 Mount Wilhelm 700m FIT-MW700-D-6/8-d11 / Plot 4 / P1127 Vial 07061" (ZSM). 1 male, 1 female "Ibisca Niugini, PNG 5-7.xi.2012 Mount Wilhelm 700m -5,731960773 145,2521667 MW0700 / P1239 Vial 16263" (ZSM). 1 male, 1 female "Ibisca Niugini, PNG 6-8.xi.2012 Mount Wilhelm 700m -5,731960773 145,2521667 ", "FIT-MW700-E-7/8-d13 / Plot 5 / P1136 Vial15886-CODYTI" (ZSM). 2 females "Ibisca Niugini, PNG 9-11.xi.2012 Mount Wilhelm 700m -5,731960773 145,2521667 MW0700 / P1217 Vial 16106" (ZSM). 1 male, 3 females "Ibisca Niugini, PNG 3-5.xi.2012 Mount Wilhelm 200m -5,739897251 145,329742 MW0200 / P0856 Vial 09605" (ZSM). 1 female "Ibisca Niugini, PNG 3-5.xi.2012 Mount Wilhelm 200m -5,739897251 145,329742 MW0200 / P0865 Vial 09576" (ZSM). Eastern Highlands: 6 males, 7 females "Papua New Guinea: Eastern Highlands, Bena Bridge, 1400m, 8.xii.2007, 06.10.781S 145.26.034E, Balke & Sagata (PNG 164)" (NHMW, ZSM).

Diagnosis.

For complete description, see Balke (1998: 332). Beetle small or medium-sized: TL-H 3.45-3.9 mm; oblong-oval, sometimes slightly more attenuated posteriorly; with characteristic dorsal colouration: dark (brown to piceous) elytra and pale (reddish to reddish brown pronotum, except for darker disc, and head; shiny, with very fine, on elytra often almost invisible punctation and weakly impressed microreticulation; pronotum with very narrow lateral bead ( Fig. 35 ); male protarsomere 4 with medium-sized, thick, strongly curved anterolateral hook-like seta; male protarsomere 5 with anterior band of ca. 30 and posterior row of nine relatively long setae ( Fig. 40D ); median lobe robust, without lateral setae apically; in lateral view, with broadened, triangle apex; in ventral view, apex deeply concave; paramere very slightly concave on dorsal side and with long and dense subdistal and inconspicuous proximal setae ( Fig. 40 A–C ).

Affinities.

In the area of its distribution, E. larsoni co-occurs with numerous species of the E. ekari , E. ullrichi , E. broschii , and E. danae groups. From all them, this characteristic species can be easily distinguished by its size, colouration, fine surface sculpture, simple male antennae, and mainly by the shape of the median lobe. Even females of the species differ from more similar in body form E. brahminensis Shaverdo et al., 2012 and E. broschii (Balke, 1998) in colouration (more uniform in two latter species) and narrow pronotal bead (absent E. brahminensis in and distinct in E. broschii ). For affinities within the group, see the “Key”.

Distribution.

Papua New Guinea: Madang and Eastern Highlands Provinces. The species is known from numerous specimens from the central and wertern part of Madang and from northern part of Eastern Highlands ( Fig. 45 ).

Figures

Figure 40. Exocelina larsoni (Balke, 1998) A median lobe in ventral view B median lobe in lateral view C paramere in external view D male protarsomeres 4 - 5 in ventral view.

Figure 45. Map of the eastern part of New Guinea showing distribution of the species of the E. larsoni and takime groups.

Figures 35 - 39. Habitus and colouration 35 Exocelina larsoni (Balke, 1998) 36 E. nomax (J. Balfour-Browne, 1939) A holotype B specimen from Tapini 37 E. warahulenensis sp. nov. 38 E. mianminensis sp. nov. 39 E. takime (Balke, 1998).